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+ (opens new window)

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That's a Four-Oh-Four.
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- + diff --git a/assets/js/19.cd75d4ee.js b/assets/js/19.18ad1143.js similarity index 99% rename from assets/js/19.cd75d4ee.js rename to assets/js/19.18ad1143.js index bd758b15f0..f2fed08dc7 100644 --- a/assets/js/19.cd75d4ee.js +++ b/assets/js/19.18ad1143.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[19],{347:function(t,a,s){t.exports=s.p+"assets/img/bdk_flutter_complete_app.c74da859.png"},348:function(t,a,s){t.exports=s.p+"assets/img/default_flutter_app.31b31721.png"},349:function(t,a,s){t.exports=s.p+"assets/img/assets_section.b43d75e9.png"},350:function(t,a,s){t.exports=s.p+"assets/img/folder_structure.b2750bd6.png"},351:function(t,a,s){t.exports=s.p+"assets/img/bdk_flutter_title.e4e3484a.png"},352:function(t,a,s){t.exports=s.p+"assets/img/bdk_flutter_tutorial_screen_mnemonic.df703b77.png"},353:function(t,a,s){t.exports=s.p+"assets/img/bdk_flutter_tutorial_screen_createwallet.3b052736.png"},354:function(t,a,s){t.exports=s.p+"assets/img/bdk_flutter_get_balance.bfdf9ced.png"},355:function(t,a,s){t.exports=s.p+"assets/img/bdk_flutter_get_address.5db2e3cc.png"},356:function(t,a,s){t.exports=s.p+"assets/img/bdk_flutter_get_restore.db8e7e55.png"},357:function(t,a,s){t.exports=s.p+"assets/img/bdk_flutter_send.1688372b.png"},395:function(t,a,s){"use strict";s.r(a);var n=s(7),e=Object(n.a)({},(function(){var t=this,a=t._self._c;return a("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[a("h2",{attrs:{id:"introduction"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#introduction"}},[t._v("#")]),t._v(" Introduction")]),t._v(" "),a("p",[a("code",[t._v("bdk-flutter")]),t._v(" is the "),a("strong",[t._v("Bitcoin Dev kit")]),t._v("'s "),a("strong",[t._v("Flutter")]),t._v(" library which enables building bitcoin applications for Android and iOS mobile platforms. 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There will also be a "),a("strong",[a("code",[t._v("bdk-flutter")])]),t._v(" focused Livestream on "),a("a",{attrs:{href:"https://www.twitch.tv/bitcoindevelopers",target:"_blank",rel:"noopener noreferrer"}},[t._v("Twitch"),a("OutboundLink")],1),t._v(" on the Bitcoin Developers "),a("a",{attrs:{href:"https://www.youtube.com/channel/UCUq_ZdezVWKPvkWRicAYxLA/videos",target:"_blank",rel:"noopener noreferrer"}},[t._v("YouTube Channel"),a("OutboundLink")],1),t._v(" so make sure to subscribe.")]),t._v(" "),a("p",[t._v("This tutorial will explore "),a("code",[t._v("bdk-flutter")]),t._v(" usage and the API it provides. This guide will walk through the development process and code for making a bitcoin application. The bitcoin application we create will be a non-custodial HD Wallet. The application will have the functionality to create a new wallet or restore from a known mnemonic seed phrase. 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"),a("code",[t._v("bdk-flutter")]),t._v(" can be used like any other Flutter library and is available on "),a("a",{attrs:{href:"https://pub.dev/packages/bdk_flutter",target:"_blank",rel:"noopener noreferrer"}},[t._v("pub.dev"),a("OutboundLink")],1)]),t._v(" "),a("h2",{attrs:{id:"getting-started"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#getting-started"}},[t._v("#")]),t._v(" Getting Started")]),t._v(" "),a("p",[t._v("Although we won't delve deep into Flutter we will focus more on bitcoin and "),a("code",[t._v("bdk-flutter")]),t._v(", however, some rudimentary Flutter setup is required, especially a basic Flutter app to add our code.")]),t._v(" "),a("p",[t._v("start by creating a new Flutter project.")]),t._v(" "),a("p",[a("code",[t._v("flutter create bdk-flutter-quickstart")])]),t._v(" "),a("p",[t._v("Once done let's "),a("code",[t._v("cd")]),t._v(" into the new project directory and run the basic Flutter app that's created")]),t._v(" "),a("div",{staticClass:"language-shell extra-class"},[a("pre",{pre:!0,attrs:{class:"language-shell"}},[a("code",[a("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("cd")]),t._v(" bdk-flutter-quickstart\nflutter run\n")])])]),a("p",[t._v("This should start building the app and then launch the app in a simulator. So far we have created a basic Flutter project if this doesn't work then refer to the Flutter development setup guide to troubleshoot.")]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0 auto",zoom:"25%"},attrs:{src:s(348),alt:"BDK Flutter Quick Start"}}),t._v(" "),a("h2",{attrs:{id:"setting-up-flutter-app-structure"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#setting-up-flutter-app-structure"}},[t._v("#")]),t._v(" Setting up Flutter app structure")]),t._v(" "),a("p",[t._v("Let's set up a very basic app structure. Let's create an "),a("code",[t._v("assets")]),t._v(" folder in the project root and then add new folders "),a("code",[t._v("widgets")]),t._v(", "),a("code",[t._v("screens")]),t._v(", and "),a("code",[t._v("styles")]),t._v(" inside the existing "),a("code",[t._v("lib")]),t._v(" folder.")]),t._v(" "),a("p",[t._v("Paste the following code in your "),a("code",[t._v("pubspec.yaml")]),t._v(" file, assets section.")]),t._v(" "),a("div",{staticClass:"language- extra-class"},[a("pre",[a("code",[t._v("- assets/\n")])])]),a("p",[t._v("Please make sure your assets section looks like the screenshot below.\n"),a("img",{staticStyle:{display:"block",margin:"0 auto",zoom:"60%"},attrs:{src:s(349),alt:"BDK Flutter Quick Start"}})]),t._v(" "),a("p",[t._v("Once done let's run a "),a("code",[t._v("get")]),t._v(" command from the pub tool commands, this will get all the required dependencies for our project.")]),t._v(" "),a("div",{staticClass:"language-shell extra-class"},[a("pre",{pre:!0,attrs:{class:"language-shell"}},[a("code",[t._v("flutter pub get\n")])])]),a("p",[t._v("To make this quick you can download the theme, styled widgets and images used in the tutorial from the repository. The "),a("code",[t._v("theme.dart")]),t._v(" file has the theme we will use and this can be taken from "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-flutter-quickstart/blob/master/lib/styles/theme.dart",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),a("OutboundLink")],1),t._v(" and moved to the styles folder. The "),a("code",[t._v("widgets.dart")]),t._v(" file has the styled widgets we will use and these can be taken from "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-flutter-quickstart/blob/master/lib/widgets/widgets.dart",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),a("OutboundLink")],1),t._v(" and moved to the widgets folder. The image assets can be taken from "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-flutter-quickstart/tree/master/assets",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),a("OutboundLink")],1),t._v(" Alternatively, you can write your theme, widgets and use your images if you intend to style the app differently.")]),t._v(" "),a("p",[t._v("In addition to the the theme, widgets and assets. We also need to create a "),a("code",[t._v("screens")]),t._v(" folder and create a "),a("code",[t._v("home.dart")]),t._v(" file inside it, this will be where most of the code will be added.")]),t._v(" "),a("p",[t._v("Once done the file structure should look like this:")]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0px auto",zoom:"60%"},attrs:{src:s(350)}}),t._v(" "),a("p",[a("br"),t._v("Locate "),a("code",[t._v("main.dart")]),t._v(" in the project root, this will have the default code added by "),a("code",[t._v("flutter create")]),t._v(", let's delete all contents of "),a("code",[t._v("main.dart")]),t._v(" and replace it with the following code to use "),a("code",[t._v("home.dart")]),t._v(" as our main screen. 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To achieve this add the following code.")]),t._v(" "),a("div",{staticClass:"language-dart extra-class"},[a("pre",{pre:!0,attrs:{class:"language-dart"}},[a("code",[a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// screens/home.dart")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// add this as another state variable under mnemonic")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),t._v(" displayText"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// modify the generateMnemonicHandler method to also set mnemonic as displayText")]),t._v("\n\n "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Future")]),a("span",{pre:!0,attrs:{class:"token generics"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token 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extra-class"},[a("pre",{pre:!0,attrs:{class:"language-dart"}},[a("code",[a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// screens/home.dart")]),t._v("\n\n "),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("/* Result */")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// display the component only if displayText has a value")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("ResponseContainer")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("text"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v("displayText "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string-literal"}},[a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"No Response"')])]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n")])])]),a("p",[t._v('We should now have a working "Generate Mnemonic" button that displays the new mnemonic')]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0 auto",zoom:"25%"},attrs:{src:s(352)}}),t._v(" "),a("p",[t._v("A quick recap, we added a button to call a click handler ("),a("code",[t._v("generateMnemonicHandler")]),t._v(") which calls "),a("code",[t._v("generateMnemonic")]),t._v(" API of "),a("code",[t._v("bdk-flutter")]),t._v(". The click handler also sets the state for the app and also updates the "),a("code",[t._v("displayText")]),t._v(" variable to display the output of the call in the display section. We will follow this pattern for the remaining calls to "),a("code",[t._v("bdk-flutter")]),t._v(".")]),t._v(" "),a("h2",{attrs:{id:"creating-a-wallet"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#creating-a-wallet"}},[t._v("#")]),t._v(" Creating a wallet")]),t._v(" "),a("p",[t._v("Before moving on to creating a wallet, let's add a section at the top to display the balance of the wallet.")]),t._v(" "),a("p",[t._v("To display the balance we will need a state variable to store the balance and a display component to display it. We will also be creating a receive address for the wallet so a state variable will be required for the address as well.")]),t._v(" "),a("p",[t._v("Under the "),a("code",[t._v("mnemonic")]),t._v(" and "),a("code",[t._v("displayText")]),t._v(" state variables, let's add one for "),a("code",[t._v("balance")]),t._v(" and one for "),a("code",[t._v("address")])]),t._v(" "),a("div",{staticClass:"language-dart extra-class"},[a("pre",{pre:!0,attrs:{class:"language-dart"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" _HomeState "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("State")]),a("span",{pre:!0,attrs:{class:"token generics"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Home")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("TextEditingController")]),t._v(" mnemonic "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("TextEditingController")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),t._v(" displayText"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),t._v(" balance"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),t._v(" address"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),a("p",[t._v("Just below "),a("code",[t._v("/* Balance */")]),t._v(" and above "),a("code",[t._v("/* Result */")]),t._v(" add the following UI components to display the balance. We only want to show the balance when it has a value so we will use a null-aware operator "),a("code",[t._v("??")]),t._v(" for a quick "),a("code",[t._v("null")]),t._v(" check and use "),a("code",[t._v("0")]),t._v(" in case of a "),a("code",[t._v("null")]),t._v(" value.")]),t._v(" "),a("div",{staticClass:"language-dart extra-class"},[a("pre",{pre:!0,attrs:{class:"language-dart"}},[a("code",[t._v(" "),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("/* Balance */")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("BalanceContainer")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n text"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string-literal"}},[a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"${balance ?? "')])]),a("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),a("span",{pre:!0,attrs:{class:"token string-literal"}},[a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"} Sats"')])]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("/* Result */")]),t._v("\n")])])]),a("p",[a("code",[t._v("bdk_flutter")]),t._v(" creates a wallet using output descriptors which define the derivation path to derive addresses and sign transactions. More about output descriptors "),a("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),a("OutboundLink")],1),t._v(". Before creating the "),a("code",[t._v("Wallet")]),t._v(" we need to create a "),a("code",[t._v("descriptor")]),t._v(" object which will be used to generate receive addresses and a "),a("code",[t._v("changeDescriptor")]),t._v(" object to to create change addresses to collect from outgoing transactions.")]),t._v(" "),a("p",[a("code",[t._v("bdk_flutter")]),t._v("'s "),a("code",[t._v("Descriptor")]),t._v(" class has a number of descriptor templates that will help you create a simple wallet.")]),t._v(" "),a("p",[t._v("Let's add some code to create a simple "),a("code",[t._v("wpkh")]),t._v(" descriptor object by using the "),a("code",[t._v("BIP84")]),t._v(" template. This template will create a descriptor in the format "),a("code",[t._v("wpkh(key/84'/{0,1}'/0'/{0,1}/*)")])]),t._v(" "),a("p",[t._v("This descriptor will create receive ("),a("code",[t._v("KeyChainKind.External")]),t._v(") and change descriptor ("),a("code",[t._v("KeyChainKind.Internal")]),t._v(") for a specified mnemonic.")]),t._v(" "),a("div",{staticClass:"language-dart extra-class"},[a("pre",{pre:!0,attrs:{class:"language-dart"}},[a("code",[a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Future")]),a("span",{pre:!0,attrs:{class:"token generics"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("List")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Descriptor")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v(" 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punctuation"}},[t._v("}")]),t._v("\n\n")])])]),a("p",[t._v("Under the "),a("code",[t._v("address")]),t._v(" state variable, let's add a state variable called "),a("code",[t._v("wallet")]),t._v(" of the type "),a("code",[t._v("Wallet")]),t._v(" for saving the bitcoin wallet.")]),t._v(" "),a("p",[t._v("To create a wallet with "),a("code",[t._v("bdk-flutter")]),t._v(" call the "),a("code",[t._v("create")]),t._v(" constructor with "),a("code",[t._v("descriptor")]),t._v(", "),a("code",[t._v("changeDescriptor")]),t._v(" "),a("code",[t._v("network")]),t._v(", and the "),a("code",[t._v("databaseConfig")]),t._v(". For database, we can use memory as the database by specifying "),a("code",[t._v("DatabaseConfig.memory()")]),t._v("\nFollowing our pattern of a button, click handler and bdk-flutter API call, Let's add an internal method which will serve as the click handler for the \"Create Wallet\" button. We want to see the output of this call so let's use "),a("code",[t._v("setState()")]),t._v(" to set the "),a("code",[t._v("wallet")]),t._v(" object created and the "),a("code",[t._v("displayText")]),t._v(" variable with the wallet's first receive address.")]),t._v(" "),a("div",{staticClass:"language-dart extra-class"},[a("pre",{pre:!0,attrs:{class:"language-dart"}},[a("code",[t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Future")]),a("span",{pre:!0,attrs:{class:"token generics"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("void")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v(" "),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("createOrRestoreWallet")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("String")]),t._v(" mnemonic"),a("span",{pre:!0,attrs:{class:"token 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The Blockchain object will encapsulate the bitcoin node configuration which the wallet will use for syncing blocks and broadcasting transactions.")]),t._v(" "),a("p",[t._v("Let's add an internal method to create and initialize the "),a("code",[t._v("Blockchain")]),t._v(" object.")]),t._v(" "),a("div",{staticClass:"language-dart extra-class"},[a("pre",{pre:!0,attrs:{class:"language-dart"}},[a("code",[t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Future")]),a("span",{pre:!0,attrs:{class:"token generics"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("void")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v(" "),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("blockchainInit")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token 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If "),a("code",[t._v("Rpc Blockchain")]),t._v(" has its authentication values inside a cookie file, please pass in cookie path as authCookie parameter, or you can pass in rpc username and password using "),a("code",[t._v("UserPass")]),t._v(" class.")]),t._v(" "),a("p",[t._v("Refer to the readme for a complete list of options for "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-flutter#createwallet",target:"_blank",rel:"noopener noreferrer"}},[t._v("createWallet()"),a("OutboundLink")],1)]),t._v(" "),a("h2",{attrs:{id:"utxos-and-balance"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#utxos-and-balance"}},[t._v("#")]),t._v(" UTXOs and balance")]),t._v(" "),a("p",[t._v("With the "),a("code",[t._v("Wallet")]),t._v(" and "),a("code",[t._v("Blockchain")]),t._v(" created, we can now add methods to sync UTXOs and compute balance.")]),t._v(" "),a("p",[a("code",[t._v("Wallet")]),t._v(" has a "),a("code",[t._v("sync")]),t._v(" method to sync all UTXOs belonging to the wallet using the "),a("code",[t._v("Blockchain")]),t._v(" object. Once the wallet sync is complete balance is computed and "),a("code",[t._v("getBalance")]),t._v(" can fetch the balance.")]),t._v(" "),a("p",[t._v("Earlier we have already added a variable for "),a("code",[t._v("balance")]),t._v(". Now we will add buttons to call "),a("code",[t._v("sync")]),t._v(" and "),a("code",[t._v("getBalance")]),t._v(". Just below the Create Wallet button let's add two buttons as follows:")]),t._v(" "),a("div",{staticClass:"language-dart extra-class"},[a("pre",{pre:!0,attrs:{class:"language-dart"}},[a("code",[t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("SubmitButton")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v(" text"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string-literal"}},[a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Sync Wallet"')])]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n callback"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("async")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token 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"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n wallet"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("sync")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("blockchain"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n")])])]),a("p",[t._v("We should now be able to create a wallet, sync UTXOs, and get the balance")]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0 auto",zoom:"25%"},attrs:{src:s(354)}}),t._v(" "),a("p",[t._v("We can use a public testnet faucet to send testnet coins to the wallet and check that the UTXO sync and balance fetch are working correctly. Before we do that add one more method to generate a new address we can then use this address to get testnet coins from a faucet.")]),t._v(" "),a("p",[t._v("Let's use the "),a("code",[t._v("address")]),t._v(" variable that was created before for this, we need to add a button for "),a("strong",[t._v("Get Address")]),t._v(" and an internal function to call "),a("code",[t._v("Wallet")]),t._v(" and create a new address. Let's do the following")]),t._v(" "),a("p",[t._v("Add a new "),a("code",[t._v("getNewAddress")]),t._v(" function below the "),a("code",[t._v("syncWallet()")]),t._v(" function:")]),t._v(" "),a("div",{staticClass:"language-dart extra-class"},[a("pre",{pre:!0,attrs:{class:"language-dart"}},[a("code",[t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Future")]),a("span",{pre:!0,attrs:{class:"token generics"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("void")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v(" "),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("getNewAddress")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("async")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n 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"),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("getNewAddress")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n text"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string-literal"}},[a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Get Address"')])]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n")])])]),a("p",[t._v("We should now have the following, and "),a("strong",[t._v("Get Address")]),t._v(" will be able to display a new address.")]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0px auto",zoom:"25%"},attrs:{src:s(355)}}),t._v(" "),a("p",[t._v("Now that we are able to generate a receive address we can get some testnet bitcoin from one of the public "),a("a",{attrs:{href:"https://coinfaucet.eu/en/btc-testnet/",target:"_blank",rel:"noopener noreferrer"}},[t._v("testnet faucets"),a("OutboundLink")],1)]),t._v(" "),a("p",[t._v("After we send and after the transaction is confirmed we will need to sync the wallet before we can see the new balance from the received transaction.")]),t._v(" "),a("h2",{attrs:{id:"restoring-a-wallet"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#restoring-a-wallet"}},[t._v("#")]),t._v(" Restoring a wallet")]),t._v(" "),a("p",[t._v("The "),a("code",[t._v("create")]),t._v(" method creates a wallet using a "),a("code",[t._v("mnemonic")]),t._v(", to restore we can use the same method, we won't need to call "),a("code",[t._v("generateMnemonic")]),t._v(" as we will already have a "),a("code",[t._v("mnemonic")]),t._v(" to restore with.")]),t._v(" "),a("p",[t._v("This text field below the "),a("code",[t._v("Generate Mnemonic")]),t._v(" button will also display the mnemonic variable if we click Generate Mnemonic' button. The generated mnemonic will show up in the text field. We can overwrite it with our mnemonic and doing so will also overwrite the mnemonic state variable. This way the mnemonic displayed will be the one used to create the wallet.")]),t._v(" "),a("p",[t._v("We can now use our mnemonic and use it to restore a wallet. This will come in handy if we have a wallet with testnet bitcoin as these are hard to come by.")]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0px auto",zoom:"25%"},attrs:{src:s(356)}}),t._v(" "),a("h2",{attrs:{id:"sending-bitcoin"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#sending-bitcoin"}},[t._v("#")]),t._v(" Sending bitcoin")]),t._v(" "),a("p",[t._v("We are now able to receive bitcoin, now its time to add functionality to send a bitcoin transaction.")]),t._v(" "),a("p",[t._v("For making a successful bitcoin transaction "),a("code",[t._v("bdk-flutter")]),t._v(" utilizes a couple of methods. 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The development and coding focused on application-level code for use cases and we did not have to code intricate internal bitcoin protocol-level code or bitcoin node interactions, and transactions. UTXOs and sync-related functionalities were also not required. All this was managed by "),a("code",[t._v("bdk-flutter")]),t._v(" allowing us to focus on the product, functionality, and user journey. This is how "),a("code",[t._v("bdk")]),t._v(" and "),a("code",[t._v("bdk-flutter")]),t._v(" intend to make Rapid Bitcoin Application Development possible by allowing product and application developers to focus on what they know best while "),a("code",[t._v("bdk")]),t._v(" handles bitcoin complexity.")]),t._v(" "),a("p",[a("code",[t._v("bdk-flutter")]),t._v(" intends to expose functionality and APIs from "),a("code",[t._v("bdk")]),t._v(" which has a wide variety of APIs with granular details allowing for many interesting use cases to be implemented. "),a("code",[t._v("bdk-flutter")]),t._v(" and "),a("code",[t._v("bdk")]),t._v(" are constantly updated and enhanced based on feedback from product teams and developers in the bitcoin community.")]),t._v(" "),a("p",[t._v("Stay tuned for more APIs and enhancements coming to "),a("code",[t._v("bdk-flutter")]),t._v(" in the near future. Feature and API requests are most welcome. New blogs and tutorials will be published soon for a more in-depth exploration of "),a("code",[t._v("bdk-flutter")]),t._v(".")]),t._v(" "),a("p",[t._v("In the meantime keep in touch with the project by following us on "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-flutter",target:"_blank",rel:"noopener noreferrer"}},[t._v("GitHub"),a("OutboundLink")],1),t._v(" and "),a("a",{attrs:{href:"https://twitter.com/BitcoinZavior",target:"_blank",rel:"noopener noreferrer"}},[t._v("Twitter"),a("OutboundLink")],1)]),t._v(" "),a("h4",{attrs:{id:"references"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#references"}},[t._v("#")]),t._v(" References:")]),t._v(" "),a("ul",[a("li",[a("a",{attrs:{href:"https://github.com/bitcoindevkit",target:"_blank",rel:"noopener noreferrer"}},[t._v("bdk"),a("OutboundLink")],1)]),t._v(" "),a("li",[a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-flutter",target:"_blank",rel:"noopener noreferrer"}},[t._v("bdk-flutter"),a("OutboundLink")],1)]),t._v(" "),a("li",[a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-flutter-quickstart",target:"_blank",rel:"noopener noreferrer"}},[t._v("bdk-flutter-quickstart GitHub Repository"),a("OutboundLink")],1)]),t._v(" "),a("li",[a("a",{attrs:{href:"https://docs.flutter.dev/get-started/install",target:"_blank",rel:"noopener noreferrer"}},[t._v("Setup Flutter Development Environment"),a("OutboundLink")],1)]),t._v(" "),a("li",[a("a",{attrs:{href:"https://github.com/bitcoinbook/bitcoinbook/blob/develop/ch04.asciidoc",target:"_blank",rel:"noopener noreferrer"}},[t._v("Mastering Bitcoin(HD Wallet chapter)"),a("OutboundLink")],1)]),t._v(" "),a("li",[a("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md",target:"_blank",rel:"noopener noreferrer"}},[t._v("Bitcoin Output Descriptors from bitcoin GitHub"),a("OutboundLink")],1)]),t._v(" "),a("li",[t._v("Testnet Faucet: "),a("a",{attrs:{href:"https://coinfaucet.eu/en/btc-testnet/",target:"_blank",rel:"noopener noreferrer"}},[t._v("https://coinfaucet.eu/en/btc-testnet/"),a("OutboundLink")],1),t._v(" or "),a("a",{attrs:{href:"https://bitcoinfaucet.uo1.net",target:"_blank",rel:"noopener noreferrer"}},[t._v("https://bitcoinfaucet.uo1.net"),a("OutboundLink")],1)])])])}),[],!1,null,null,null);a.default=e.exports}}]); \ No newline at end of file +(window.webpackJsonp=window.webpackJsonp||[]).push([[19],{357:function(t,a,s){t.exports=s.p+"assets/img/bdk_flutter_complete_app.c74da859.png"},358:function(t,a,s){t.exports=s.p+"assets/img/default_flutter_app.31b31721.png"},359:function(t,a,s){t.exports=s.p+"assets/img/assets_section.b43d75e9.png"},360:function(t,a,s){t.exports=s.p+"assets/img/folder_structure.b2750bd6.png"},361:function(t,a,s){t.exports=s.p+"assets/img/bdk_flutter_title.e4e3484a.png"},362:function(t,a,s){t.exports=s.p+"assets/img/bdk_flutter_tutorial_screen_mnemonic.df703b77.png"},363:function(t,a,s){t.exports=s.p+"assets/img/bdk_flutter_tutorial_screen_createwallet.3b052736.png"},364:function(t,a,s){t.exports=s.p+"assets/img/bdk_flutter_get_balance.bfdf9ced.png"},365:function(t,a,s){t.exports=s.p+"assets/img/bdk_flutter_get_address.5db2e3cc.png"},366:function(t,a,s){t.exports=s.p+"assets/img/bdk_flutter_get_restore.db8e7e55.png"},367:function(t,a,s){t.exports=s.p+"assets/img/bdk_flutter_send.1688372b.png"},396:function(t,a,s){"use strict";s.r(a);var n=s(7),e=Object(n.a)({},(function(){var t=this,a=t._self._c;return a("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[a("h2",{attrs:{id:"introduction"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#introduction"}},[t._v("#")]),t._v(" Introduction")]),t._v(" "),a("p",[a("code",[t._v("bdk-flutter")]),t._v(" is the "),a("strong",[t._v("Bitcoin Dev kit")]),t._v("'s "),a("strong",[t._v("Flutter")]),t._v(" library which enables building bitcoin applications for Android and iOS mobile platforms. Using "),a("code",[t._v("bdk-flutter")]),t._v(" is similar to using any other Flutter module. Just do "),a("code",[t._v("flutter pub add bdk_flutter")]),t._v(" and you are ready to code! This is the first tutorial on how to use "),a("code",[t._v("bdk-flutter")]),t._v(", more coming soon, make sure to "),a("a",{attrs:{href:"https://twitter.com/BitcoinZavior",target:"_blank",rel:"noopener noreferrer"}},[t._v("follow"),a("OutboundLink")],1),t._v(" to be notified of new ones. There will also be a "),a("strong",[a("code",[t._v("bdk-flutter")])]),t._v(" focused Livestream on "),a("a",{attrs:{href:"https://www.twitch.tv/bitcoindevelopers",target:"_blank",rel:"noopener noreferrer"}},[t._v("Twitch"),a("OutboundLink")],1),t._v(" on the Bitcoin Developers "),a("a",{attrs:{href:"https://www.youtube.com/channel/UCUq_ZdezVWKPvkWRicAYxLA/videos",target:"_blank",rel:"noopener noreferrer"}},[t._v("YouTube Channel"),a("OutboundLink")],1),t._v(" so make sure to subscribe.")]),t._v(" "),a("p",[t._v("This tutorial will explore "),a("code",[t._v("bdk-flutter")]),t._v(" usage and the API it provides. This guide will walk through the development process and code for making a bitcoin application. The bitcoin application we create will be a non-custodial HD Wallet. The application will have the functionality to create a new wallet or restore from a known mnemonic seed phrase. This application will also be able to interact with the bitcoin network to sync UTXOs from new blocks and broadcast transactions.")]),t._v(" "),a("p",[t._v("The tutorial will focus on bitcoin concepts and "),a("code",[t._v("bdk-flutter")]),t._v(" API. So it will gloss over Flutter and Dart. If you are interested in learning more about Flutter and Dart please refer to the Flutter "),a("a",{attrs:{href:"https://flutter.dev/learn",target:"_blank",rel:"noopener noreferrer"}},[t._v("learning portal"),a("OutboundLink")],1),t._v(". The code for this tutorial is available on the "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-flutter-quickstart",target:"_blank",rel:"noopener noreferrer"}},[t._v("LtbLightning GitHub"),a("OutboundLink")],1)]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0 auto",zoom:"25%"},attrs:{src:s(357)}}),t._v(" "),a("h3",{attrs:{id:"prerequisites"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#prerequisites"}},[t._v("#")]),t._v(" Prerequisites")]),t._v(" "),a("p",[t._v("To use "),a("code",[t._v("bdk-flutter")]),t._v(" in a Flutter App, a Flutter development environment is required. Please refer to resources out there on the internet if you need to set this up, here is one of many good resources to guide you on "),a("a",{attrs:{href:"https://docs.flutter.dev/get-started/install",target:"_blank",rel:"noopener noreferrer"}},[t._v("environment setup"),a("OutboundLink")],1)]),t._v(" "),a("h3",{attrs:{id:"bitcoin-basics"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#bitcoin-basics"}},[t._v("#")]),t._v(" Bitcoin Basics")]),t._v(" "),a("p",[t._v("The bitcoin concepts used in this blog post are detailed and explained very well in external bitcoin resources. Here are some links for reference:")]),t._v(" "),a("p",[a("a",{attrs:{href:"https://github.com/bitcoinbook/bitcoinbook/blob/develop/ch04.asciidoc",target:"_blank",rel:"noopener noreferrer"}},[t._v("Mastering Bitcoin(HD Wallet chapter)"),a("OutboundLink")],1)]),t._v(" "),a("p",[a("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md",target:"_blank",rel:"noopener noreferrer"}},[t._v("Bitcoin Output Descriptors from bitcoin GitHub"),a("OutboundLink")],1)]),t._v(" "),a("p",[t._v("Now let's jump into Bitcoin Dev Kit")]),t._v(" "),a("h2",{attrs:{id:"bitcoin-dev-kit-and-bdk-flutter"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#bitcoin-dev-kit-and-bdk-flutter"}},[t._v("#")]),t._v(" Bitcoin Dev Kit and bdk-flutter")]),t._v(" "),a("p",[a("code",[t._v("bdk-flutter")]),t._v(" is "),a("strong",[t._v("Bitcoin Dev kit")]),t._v("'s "),a("strong",[t._v("Flutter")]),t._v(" library for building Bitcoin apps in "),a("strong",[t._v("Flutter")]),t._v(".\nIt encapsulates all of the low-level APIs and methods for BDK and exposes them in a Flutter context. To use BDK in Flutter apps only the "),a("code",[t._v("bdk-flutter")]),t._v(" module is required. "),a("code",[t._v("bdk-flutter")]),t._v(" can be used like any other Flutter library and is available on "),a("a",{attrs:{href:"https://pub.dev/packages/bdk_flutter",target:"_blank",rel:"noopener noreferrer"}},[t._v("pub.dev"),a("OutboundLink")],1)]),t._v(" "),a("h2",{attrs:{id:"getting-started"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#getting-started"}},[t._v("#")]),t._v(" Getting Started")]),t._v(" "),a("p",[t._v("Although we won't delve deep into Flutter we will focus more on bitcoin and "),a("code",[t._v("bdk-flutter")]),t._v(", however, some rudimentary Flutter setup is required, especially a basic Flutter app to add our code.")]),t._v(" "),a("p",[t._v("start by creating a new Flutter project.")]),t._v(" "),a("p",[a("code",[t._v("flutter create bdk-flutter-quickstart")])]),t._v(" "),a("p",[t._v("Once done let's "),a("code",[t._v("cd")]),t._v(" into the new project directory and run the basic Flutter app that's created")]),t._v(" "),a("div",{staticClass:"language-shell extra-class"},[a("pre",{pre:!0,attrs:{class:"language-shell"}},[a("code",[a("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("cd")]),t._v(" bdk-flutter-quickstart\nflutter run\n")])])]),a("p",[t._v("This should start building the app and then launch the app in a simulator. 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punctuation"}},[t._v("}")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("Now we need to add a component to display the output of our method calls and this will also need a "),a("code",[t._v("displayText")]),t._v(" variable to track our method call response. To achieve this add the following code.")]),t._v(" "),a("div",{staticClass:"language-dart extra-class"},[a("pre",{pre:!0,attrs:{class:"language-dart"}},[a("code",[a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// screens/home.dart")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// add this as another state variable under mnemonic")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),t._v(" displayText"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// modify the generateMnemonicHandler method to also set mnemonic as displayText")]),t._v("\n\n "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Future")]),a("span",{pre:!0,attrs:{class:"token generics"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token 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punctuation"}},[t._v(",")]),t._v("\n")])])]),a("p",[t._v('We should now have a working "Generate Mnemonic" button that displays the new mnemonic')]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0 auto",zoom:"25%"},attrs:{src:s(362)}}),t._v(" "),a("p",[t._v("A quick recap, we added a button to call a click handler ("),a("code",[t._v("generateMnemonicHandler")]),t._v(") which calls "),a("code",[t._v("generateMnemonic")]),t._v(" API of "),a("code",[t._v("bdk-flutter")]),t._v(". The click handler also sets the state for the app and also updates the "),a("code",[t._v("displayText")]),t._v(" variable to display the output of the call in the display section. We will follow this pattern for the remaining calls to "),a("code",[t._v("bdk-flutter")]),t._v(".")]),t._v(" "),a("h2",{attrs:{id:"creating-a-wallet"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#creating-a-wallet"}},[t._v("#")]),t._v(" Creating a wallet")]),t._v(" "),a("p",[t._v("Before moving on to creating a wallet, let's add a section at the top to display the balance of the wallet.")]),t._v(" "),a("p",[t._v("To display the balance we will need a state variable to store the balance and a display component to display it. We will also be creating a receive address for the wallet so a state variable will be required for the address as well.")]),t._v(" "),a("p",[t._v("Under the "),a("code",[t._v("mnemonic")]),t._v(" and "),a("code",[t._v("displayText")]),t._v(" state variables, let's add one for "),a("code",[t._v("balance")]),t._v(" and one for "),a("code",[t._v("address")])]),t._v(" "),a("div",{staticClass:"language-dart extra-class"},[a("pre",{pre:!0,attrs:{class:"language-dart"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" _HomeState "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("State")]),a("span",{pre:!0,attrs:{class:"token generics"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Home")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("TextEditingController")]),t._v(" mnemonic "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("TextEditingController")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),t._v(" displayText"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),t._v(" balance"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),t._v(" address"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),a("p",[t._v("Just below "),a("code",[t._v("/* Balance */")]),t._v(" and above "),a("code",[t._v("/* Result */")]),t._v(" add the following UI components to display the balance. We only want to show the balance when it has a value so we will use a null-aware operator "),a("code",[t._v("??")]),t._v(" for a quick "),a("code",[t._v("null")]),t._v(" check and use "),a("code",[t._v("0")]),t._v(" in case of a "),a("code",[t._v("null")]),t._v(" value.")]),t._v(" "),a("div",{staticClass:"language-dart extra-class"},[a("pre",{pre:!0,attrs:{class:"language-dart"}},[a("code",[t._v(" "),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("/* Balance */")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("BalanceContainer")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n text"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string-literal"}},[a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"${balance ?? 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Before creating the "),a("code",[t._v("Wallet")]),t._v(" we need to create a "),a("code",[t._v("descriptor")]),t._v(" object which will be used to generate receive addresses and a "),a("code",[t._v("changeDescriptor")]),t._v(" object to to create change addresses to collect from outgoing transactions.")]),t._v(" "),a("p",[a("code",[t._v("bdk_flutter")]),t._v("'s "),a("code",[t._v("Descriptor")]),t._v(" class has a number of descriptor templates that will help you create a simple wallet.")]),t._v(" "),a("p",[t._v("Let's add some code to create a simple "),a("code",[t._v("wpkh")]),t._v(" descriptor object by using the "),a("code",[t._v("BIP84")]),t._v(" template. This template will create a descriptor in the format "),a("code",[t._v("wpkh(key/84'/{0,1}'/0'/{0,1}/*)")])]),t._v(" "),a("p",[t._v("This descriptor will create receive ("),a("code",[t._v("KeyChainKind.External")]),t._v(") and change descriptor ("),a("code",[t._v("KeyChainKind.Internal")]),t._v(") for a specified mnemonic.")]),t._v(" "),a("div",{staticClass:"language-dart extra-class"},[a("pre",{pre:!0,attrs:{class:"language-dart"}},[a("code",[a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Future")]),a("span",{pre:!0,attrs:{class:"token generics"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("List")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Descriptor")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v(" 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punctuation"}},[t._v(",")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n")])])]),a("p",[t._v("The response returned by "),a("code",[t._v("create()")]),t._v(" is a "),a("code",[t._v("Wallet")]),t._v(" object.")]),t._v(" "),a("p",[t._v("The App should now be creating a wallet when we click "),a("strong",[t._v("Create Mnemonic")]),t._v(" followed by "),a("strong",[t._v("Create Wallet")]),t._v(".")]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0 auto",zoom:"25%"},attrs:{src:s(363)}}),t._v(" "),a("p",[t._v("Before going forward, we need to create a "),a("code",[t._v("Blockchain")]),t._v(" object as well. The Blockchain object will encapsulate the bitcoin node configuration which the wallet will use for syncing blocks and broadcasting transactions.")]),t._v(" "),a("p",[t._v("Let's add an internal method to create and initialize the "),a("code",[t._v("Blockchain")]),t._v(" object.")]),t._v(" "),a("div",{staticClass:"language-dart extra-class"},[a("pre",{pre:!0,attrs:{class:"language-dart"}},[a("code",[t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Future")]),a("span",{pre:!0,attrs:{class:"token generics"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("void")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v(" "),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("blockchainInit")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("async")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n blockchain "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("await")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Blockchain")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("create")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n config"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("BlockchainConfig")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("electrum")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n config"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("ElectrumConfig")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n stopGap"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token number"}},[t._v("10")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n timeout"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token number"}},[t._v("5")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n retry"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token number"}},[t._v("5")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n url"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string-literal"}},[a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"ssl://electrum.blockstream.info:60002"')])]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n validateDomain"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token boolean"}},[t._v("false")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("Here we are initializing the "),a("code",[t._v("late")]),t._v(" non-nullable "),a("code",[t._v("blockchain")]),t._v(" variable, by calling the named constructor "),a("code",[t._v("create")]),t._v(", which takes a "),a("code",[t._v("BlockchainConfig")]),t._v(" object.\nThe bitcoin node specified is an Electrum node and we are specifying the url for Blockstream's public Electrum Testnet servers over SSL.")]),t._v(" "),a("p",[t._v("After creating the "),a("code",[t._v("blockchainInit()")]),t._v(" method, call it from "),a("code",[t._v("createOrRestoreWallet()")]),t._v(", so the "),a("code",[t._v("blockchain")]),t._v(" variable gets initialized before the "),a("code",[t._v("wallet")]),t._v(" is created.")]),t._v(" "),a("p",[t._v("Include the following line of code inside "),a("code",[t._v("createOrRestoreWallet()")]),t._v(" just before calling Wallet.create().")]),t._v(" "),a("div",{staticClass:"language-dart extra-class"},[a("pre",{pre:!0,attrs:{class:"language-dart"}},[a("code",[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("await")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("blockchainInit")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("final")]),t._v(" res "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("await")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Wallet")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("create")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("\n")])])]),a("p",[a("strong",[t._v("blockChainConfig")]),t._v(": BlockchainConfig is an enum that has 3 values, "),a("code",[t._v("BlockchainConfig.electrum")]),t._v(" for "),a("a",{attrs:{href:"https://github.com/romanz/electrs",target:"_blank",rel:"noopener noreferrer"}},[a("code",[t._v("electrum")]),a("OutboundLink")],1),t._v(" ,"),a("code",[t._v("BlockchainConfig.esplora")]),t._v(" for "),a("a",{attrs:{href:"https://github.com/Blockstream/esplora",target:"_blank",rel:"noopener noreferrer"}},[a("code",[t._v("esplora")]),a("OutboundLink")],1),t._v(" and "),a("code",[t._v("BlockchainConfig.rpc")]),t._v(" .")]),t._v(" "),a("p",[a("code",[t._v("BlockchainConfig.electrum")]),t._v(", "),a("code",[t._v("BlockchainConfig.rpc")]),t._v(" & "),a("code",[t._v("BlockchainConfig.esplora")]),t._v(" has "),a("code",[t._v("ElectrumConfig")]),t._v(" object, "),a("code",[t._v("RpcConfig")]),t._v(" object and "),a("code",[t._v("EsploraConfig")]),t._v(" object, respectively as its parameter.")]),t._v(" "),a("p",[a("strong",[t._v("ElectrumConfig")]),t._v(": This is the object type of "),a("code",[t._v("BlockchainConfig.electrum")]),t._v("'s config that takes a timeout, retry & url as its required parameter.")]),t._v(" "),a("p",[a("strong",[t._v("EsploraConfig")]),t._v(": This is the object type of "),a("code",[t._v("BlockchainConfig.esplora")]),t._v("'s config that takes baseUrl & stopGap as its required parameter.")]),t._v(" "),a("p",[a("strong",[t._v("RpcConfig")]),t._v(": This is the object type of "),a("code",[t._v("BlockchainConfig.rpc")]),t._v("'s config that takes url, network, & walletName as its required parameter. If "),a("code",[t._v("Rpc Blockchain")]),t._v(" has its authentication values inside a cookie file, please pass in cookie path as authCookie parameter, or you can pass in rpc username and password using "),a("code",[t._v("UserPass")]),t._v(" class.")]),t._v(" "),a("p",[t._v("Refer to the readme for a complete list of options for "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-flutter#createwallet",target:"_blank",rel:"noopener noreferrer"}},[t._v("createWallet()"),a("OutboundLink")],1)]),t._v(" "),a("h2",{attrs:{id:"utxos-and-balance"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#utxos-and-balance"}},[t._v("#")]),t._v(" UTXOs and balance")]),t._v(" "),a("p",[t._v("With the "),a("code",[t._v("Wallet")]),t._v(" and "),a("code",[t._v("Blockchain")]),t._v(" created, we can now add methods to sync UTXOs and compute balance.")]),t._v(" "),a("p",[a("code",[t._v("Wallet")]),t._v(" has a "),a("code",[t._v("sync")]),t._v(" method to sync all UTXOs belonging to the wallet using the "),a("code",[t._v("Blockchain")]),t._v(" object. Once the wallet sync is complete balance is computed and "),a("code",[t._v("getBalance")]),t._v(" can fetch the balance.")]),t._v(" "),a("p",[t._v("Earlier we have already added a variable for "),a("code",[t._v("balance")]),t._v(". Now we will add buttons to call "),a("code",[t._v("sync")]),t._v(" and "),a("code",[t._v("getBalance")]),t._v(". Just below the Create Wallet button let's add two buttons as follows:")]),t._v(" "),a("div",{staticClass:"language-dart extra-class"},[a("pre",{pre:!0,attrs:{class:"language-dart"}},[a("code",[t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("SubmitButton")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v(" text"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string-literal"}},[a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Sync Wallet"')])]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n callback"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("async")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token 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punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("async")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("await")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("getBalance")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n text"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string-literal"}},[a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Get Balance"')])]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n")])])]),a("p",[t._v("Let's add two internal functions for syncing UTXOs and compute balance.")]),t._v(" "),a("div",{staticClass:"language-dart extra-class"},[a("pre",{pre:!0,attrs:{class:"language-dart"}},[a("code",[t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Future")]),a("span",{pre:!0,attrs:{class:"token generics"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("void")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v(" "),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("getBalance")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token 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')]),a("span",{pre:!0,attrs:{class:"token interpolation"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("${")]),a("span",{pre:!0,attrs:{class:"token expression"}},[t._v("balanceObj"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("total"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("toString")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")])]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")])]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"')])]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("print")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("res"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token 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"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n wallet"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("sync")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("blockchain"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n")])])]),a("p",[t._v("We should now be able to create a wallet, sync UTXOs, and get the balance")]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0 auto",zoom:"25%"},attrs:{src:s(364)}}),t._v(" "),a("p",[t._v("We can use a public testnet faucet to send testnet coins to the wallet and check that the UTXO sync and balance fetch are working correctly. Before we do that add one more method to generate a new address we can then use this address to get testnet coins from a faucet.")]),t._v(" "),a("p",[t._v("Let's use the "),a("code",[t._v("address")]),t._v(" variable that was created before for this, we need to add a button for "),a("strong",[t._v("Get Address")]),t._v(" and an internal function to call "),a("code",[t._v("Wallet")]),t._v(" and create a new address. Let's do the following")]),t._v(" "),a("p",[t._v("Add a new "),a("code",[t._v("getNewAddress")]),t._v(" function below the "),a("code",[t._v("syncWallet()")]),t._v(" function:")]),t._v(" "),a("div",{staticClass:"language-dart extra-class"},[a("pre",{pre:!0,attrs:{class:"language-dart"}},[a("code",[t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Future")]),a("span",{pre:!0,attrs:{class:"token generics"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("void")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v(" "),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("getNewAddress")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("async")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n 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The generated mnemonic will show up in the text field. We can overwrite it with our mnemonic and doing so will also overwrite the mnemonic state variable. This way the mnemonic displayed will be the one used to create the wallet.")]),t._v(" "),a("p",[t._v("We can now use our mnemonic and use it to restore a wallet. This will come in handy if we have a wallet with testnet bitcoin as these are hard to come by.")]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0px auto",zoom:"25%"},attrs:{src:s(366)}}),t._v(" "),a("h2",{attrs:{id:"sending-bitcoin"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#sending-bitcoin"}},[t._v("#")]),t._v(" Sending bitcoin")]),t._v(" "),a("p",[t._v("We are now able to receive bitcoin, now its time to add functionality to send a bitcoin transaction.")]),t._v(" "),a("p",[t._v("For making a successful bitcoin transaction "),a("code",[t._v("bdk-flutter")]),t._v(" utilizes a couple of methods. A new unsigned transaction can be created by using TxBuilder](https://github.com/LtbLightning/bdk-flutter#quicksend).")]),t._v(" "),a("p",[t._v("First, we have to initialize the "),a("code",[t._v("TxBuilder")]),t._v(" object and call the "),a("code",[t._v("addRecipient()")]),t._v(" method.\n"),a("code",[t._v("addRecipient()")]),t._v(" takes a "),a("code",[t._v("Script")]),t._v(" object and the transaction "),a("code",[t._v("amount")]),t._v(".")]),t._v(" "),a("div",{staticClass:"language-dart extra-class"},[a("pre",{pre:!0,attrs:{class:"language-dart"}},[a("code",[t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("final")]),t._v(" res "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("await")]),t._v(" txBuilder"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("addRecipient")]),a("span",{pre:!0,attrs:{class:"token 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The development and coding focused on application-level code for use cases and we did not have to code intricate internal bitcoin protocol-level code or bitcoin node interactions, and transactions. UTXOs and sync-related functionalities were also not required. All this was managed by "),a("code",[t._v("bdk-flutter")]),t._v(" allowing us to focus on the product, functionality, and user journey. This is how "),a("code",[t._v("bdk")]),t._v(" and "),a("code",[t._v("bdk-flutter")]),t._v(" intend to make Rapid Bitcoin Application Development possible by allowing product and application developers to focus on what they know best while "),a("code",[t._v("bdk")]),t._v(" handles bitcoin complexity.")]),t._v(" "),a("p",[a("code",[t._v("bdk-flutter")]),t._v(" intends to expose functionality and APIs from "),a("code",[t._v("bdk")]),t._v(" which has a wide variety of APIs with granular details allowing for many interesting use cases to be implemented. "),a("code",[t._v("bdk-flutter")]),t._v(" and "),a("code",[t._v("bdk")]),t._v(" are constantly updated and enhanced based on feedback from product teams and developers in the bitcoin community.")]),t._v(" "),a("p",[t._v("Stay tuned for more APIs and enhancements coming to "),a("code",[t._v("bdk-flutter")]),t._v(" in the near future. Feature and API requests are most welcome. New blogs and tutorials will be published soon for a more in-depth exploration of "),a("code",[t._v("bdk-flutter")]),t._v(".")]),t._v(" "),a("p",[t._v("In the meantime keep in touch with the project by following us on "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-flutter",target:"_blank",rel:"noopener noreferrer"}},[t._v("GitHub"),a("OutboundLink")],1),t._v(" and "),a("a",{attrs:{href:"https://twitter.com/BitcoinZavior",target:"_blank",rel:"noopener noreferrer"}},[t._v("Twitter"),a("OutboundLink")],1)]),t._v(" "),a("h4",{attrs:{id:"references"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#references"}},[t._v("#")]),t._v(" References:")]),t._v(" "),a("ul",[a("li",[a("a",{attrs:{href:"https://github.com/bitcoindevkit",target:"_blank",rel:"noopener noreferrer"}},[t._v("bdk"),a("OutboundLink")],1)]),t._v(" "),a("li",[a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-flutter",target:"_blank",rel:"noopener noreferrer"}},[t._v("bdk-flutter"),a("OutboundLink")],1)]),t._v(" "),a("li",[a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-flutter-quickstart",target:"_blank",rel:"noopener noreferrer"}},[t._v("bdk-flutter-quickstart GitHub Repository"),a("OutboundLink")],1)]),t._v(" "),a("li",[a("a",{attrs:{href:"https://docs.flutter.dev/get-started/install",target:"_blank",rel:"noopener noreferrer"}},[t._v("Setup Flutter Development Environment"),a("OutboundLink")],1)]),t._v(" "),a("li",[a("a",{attrs:{href:"https://github.com/bitcoinbook/bitcoinbook/blob/develop/ch04.asciidoc",target:"_blank",rel:"noopener noreferrer"}},[t._v("Mastering Bitcoin(HD Wallet chapter)"),a("OutboundLink")],1)]),t._v(" "),a("li",[a("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md",target:"_blank",rel:"noopener noreferrer"}},[t._v("Bitcoin Output Descriptors from bitcoin GitHub"),a("OutboundLink")],1)]),t._v(" "),a("li",[t._v("Testnet Faucet: "),a("a",{attrs:{href:"https://coinfaucet.eu/en/btc-testnet/",target:"_blank",rel:"noopener noreferrer"}},[t._v("https://coinfaucet.eu/en/btc-testnet/"),a("OutboundLink")],1),t._v(" or "),a("a",{attrs:{href:"https://bitcoinfaucet.uo1.net",target:"_blank",rel:"noopener noreferrer"}},[t._v("https://bitcoinfaucet.uo1.net"),a("OutboundLink")],1)])])])}),[],!1,null,null,null);a.default=e.exports}}]); \ No newline at end of file diff --git a/assets/js/21.462b994e.js b/assets/js/21.9a934337.js similarity index 98% rename from assets/js/21.462b994e.js rename to assets/js/21.9a934337.js index 5d7f31629a..451ce62ec7 100644 --- a/assets/js/21.462b994e.js +++ b/assets/js/21.9a934337.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[21],{358:function(t,a,s){t.exports=s.p+"assets/img/bdk_rn_complete_app.e382f61c.png"},359:function(t,a,s){t.exports=s.p+"assets/img/default_rn_app.9e60b4fb.png"},360:function(t,a,s){t.exports=s.p+"assets/img/folder_structure.d1c95bd6.png"},361:function(t,a,s){t.exports=s.p+"assets/img/bdk_rn_title.289f266d.png"},362:function(t,a,s){t.exports=s.p+"assets/img/bdk_rn_tutorial_screen_mnemonic.9963c418.png"},363:function(t,a,s){t.exports=s.p+"assets/img/bdk_rn_tutorial_screen_createwallet.916f2610.png"},364:function(t,a,s){t.exports=s.p+"assets/img/bdk_rn_get_balance.75af17bf.png"},365:function(t,a,s){t.exports=s.p+"assets/img/bdk_rn_get_address.4f570fb2.png"},366:function(t,a,s){t.exports=s.p+"assets/img/bdk_rn_get_restore.134b3681.png"},367:function(t,a,s){t.exports=s.p+"assets/img/bdk_rn_send.4e9dbc4a.png"},397:function(t,a,s){"use strict";s.r(a);var n=s(7),e=Object(n.a)({},(function(){var t=this,a=t._self._c;return a("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[a("h2",{attrs:{id:"introduction"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#introduction"}},[t._v("#")]),t._v(" Introduction")]),t._v(" "),a("p",[a("code",[t._v("bdk-rn")]),t._v(" is the "),a("strong",[t._v("Bitcoin Dev kit")]),t._v("'s "),a("strong",[t._v("React Native")]),t._v(" library which enables building bitcoin applications for Android and iOS mobile platforms. Using "),a("code",[t._v("bdk-rn")]),t._v(" does not require knowledge of the underlying bitcoin or BDK API. Using "),a("code",[t._v("bdk-rn")]),t._v(" is similar to using any other RN module. Just do "),a("code",[t._v("yarn add bdk-rn")]),t._v(" and you are ready to code! This is the first tutorial on how to use "),a("code",[t._v("bdk-rn")]),t._v(", more coming soon, make sure to "),a("a",{attrs:{href:"https://twitter.com/BitcoinZavior?ref_src=twsrc%5Etfw",target:"_blank",rel:"noopener noreferrer"}},[t._v("follow"),a("OutboundLink")],1),t._v(" to be notified of new ones. In case you missed it, there is a recorded "),a("code",[t._v("bdk-rn")]),t._v(" focused Twitch Livestream available on the "),a("a",{attrs:{href:"https://www.youtube.com/watch?v=gMpWA875go4",target:"_blank",rel:"noopener noreferrer"}},[t._v("Bitcoin Developers"),a("OutboundLink")],1),t._v(" YouTube channel which covers most of this article, make sure to subscribe to Bitcoin Developers "),a("a",{attrs:{href:"https://www.youtube.com/channel/UCUq_ZdezVWKPvkWRicAYxLA/videos",target:"_blank",rel:"noopener noreferrer"}},[t._v("YouTube Channel"),a("OutboundLink")],1),t._v(" for more bitcoin development videos.")]),t._v(" "),a("p",[t._v("In this tutorial, we will explore "),a("code",[t._v("bdk-rn")]),t._v(" usage and the API it provides. This guide will walk through the development process and code for making a bitcoin application. The bitcoin application we create will be a non-custodial HD Wallet. The application will have the functionality to create a new wallet or restore from a known mnemonic seed phrase. This application will also be able to interact with the bitcoin network to sync UTXOs from new blocks and broadcast transactions.")]),t._v(" "),a("p",[t._v("The tutorial will focus on bitcoin and "),a("code",[t._v("bdk-rn")]),t._v(" concepts and API. So it will gloss over React Native aspects. 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Please refer to resources out there on the internet if you need to set this up, here is one of many good resources to guide you on "),a("a",{attrs:{href:"https://reactnative.dev/docs/environment-setup",target:"_blank",rel:"noopener noreferrer"}},[t._v("environment setup"),a("OutboundLink")],1)]),t._v(" "),a("h3",{attrs:{id:"bitcoin-basics"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#bitcoin-basics"}},[t._v("#")]),t._v(" Bitcoin Basics")]),t._v(" "),a("p",[t._v("The bitcoin concepts used in this blog post are detailed and explained very well in external bitcoin resources. Here are some links for reference:")]),t._v(" "),a("p",[a("a",{attrs:{href:"https://github.com/bitcoinbook/bitcoinbook/blob/develop/ch04.asciidoc",target:"_blank",rel:"noopener noreferrer"}},[t._v("Mastering Bitcoin(HD Wallet chapter)"),a("OutboundLink")],1)]),t._v(" "),a("p",[a("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md",target:"_blank",rel:"noopener noreferrer"}},[t._v("Bitcoin Output Descriptors from bitcoin GitHub"),a("OutboundLink")],1)]),t._v(" "),a("p",[t._v("Now let's jump into Bitcoin Dev Kit")]),t._v(" "),a("h2",{attrs:{id:"bitcoin-dev-kit-and-bdk-rn"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#bitcoin-dev-kit-and-bdk-rn"}},[t._v("#")]),t._v(" Bitcoin Dev Kit and bdk-rn")]),t._v(" "),a("p",[a("code",[t._v("bdk-rn")]),t._v(" is a React Native library of Bitcoin Dev Kit(BDK) for building React Native Apps.\nIt encapsulates all of the low-level APIs and methods for BDK and exposes them in a react native context. To use BDK in React Native(RN) apps only the "),a("code",[t._v("bdk-rn")]),t._v(" module is required. 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So far we have created a basic RN project if this doesn't work then refer to the React Native development setup guide to troubleshoot.")]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0 auto",zoom:"25%"},attrs:{src:s(359)}}),t._v(" "),a("h2",{attrs:{id:"setting-up-styles-and-rn-app-structure"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#setting-up-styles-and-rn-app-structure"}},[t._v("#")]),t._v(" Setting up styles and RN app structure")]),t._v(" "),a("p",[t._v("Let's set up a very basic app structure and some RN scaffolding. Let's create an "),a("code",[t._v("src")]),t._v(" folder in the project root and inside it add new folders for "),a("code",[t._v("assets")]),t._v(", "),a("code",[t._v("elements")]),t._v(", "),a("code",[t._v("screens")]),t._v(" and "),a("code",[t._v("styles")])]),t._v(" "),a("p",[t._v("To make this quick you can download the styles and images used in the tutorial from the repository. 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We will also need a button which will invoke generateMnemonic when clicked. 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button which displays the new mnemonic')]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0 auto",zoom:"50%"},attrs:{src:s(362)}}),t._v(" "),a("p",[t._v("A quick recap, we added a button to trigger a call to a method. We created a button click event handler to call bdk-rn. Set the display state variable to display the output of the call in the display section. We will follow this pattern for the remaining calls to bdk-rn.")]),t._v(" "),a("h2",{attrs:{id:"creating-a-wallet"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#creating-a-wallet"}},[t._v("#")]),t._v(" Creating a wallet")]),t._v(" "),a("p",[t._v("Before moving on to creating a wallet, let's add a section at the top to display the balance of the wallet.")]),t._v(" "),a("p",[t._v("To display the balance we will need a state variable to store the balance and a display section to display it.")]),t._v(" "),a("p",[t._v("Under the "),a("code",[t._v("mnemonic")]),t._v(" and "),a("code",[t._v("displayText")]),t._v(" variables, let's add one for "),a("code",[t._v("balance")]),t._v(" as well")]),t._v(" "),a("div",{staticClass:"language-jsx extra-class"},[a("pre",{pre:!0,attrs:{class:"language-jsx"}},[a("code",[t._v("\t"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("const")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token function-variable function"}},[t._v("Home")]),t._v(" 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function"}},[t._v("stringify")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("data"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),a("p",[t._v("A new button will be required to trigger "),a("code",[t._v("createWallet")])]),t._v(" "),a("p",[t._v("Let's add a new button just above "),a("code",[t._v("{/* input boxes and send transaction button */}")])]),t._v(" "),a("div",{staticClass:"language-jsx extra-class"},[a("pre",{pre:!0,attrs:{class:"language-jsx"}},[a("code",[t._v("\t\t\t\t"),a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token 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"),a("div",{staticClass:"language-javascript extra-class"},[a("pre",{pre:!0,attrs:{class:"language-javascript"}},[a("code",[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token string-property property"}},[t._v('"data"')]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token string-property property"}},[t._v('"address"')]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"tb1qxg8g8cdzgs09cttu3y7lc33udqc4wsesunjnhe"')]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token string-property property"}},[t._v('"error"')]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token boolean"}},[t._v("false")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("The App should now be creating a wallet when we click "),a("strong",[t._v("Create Mnemonic")]),t._v(" followed by "),a("strong",[t._v("Create Wallet")]),t._v(".")]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0 auto",zoom:"50%"},attrs:{src:s(363)}}),t._v(" "),a("p",[t._v("The wallet created is a HD wallet and the address displayed is the 0 index address for the wallet. The path used by default is 84'/1'/0'/0/* for addresses and 84'/1'/0'/1/* for change.")]),t._v(" "),a("p",[t._v("As we specified "),a("code",[t._v("testnet")]),t._v(" and did not specify "),a("code",[t._v("blockChainName")]),t._v(" and "),a("code",[t._v("blockChainConfigUrl")]),t._v(" a default testnet server will be used as the bitcoin node, "),a("code",[t._v("ssl://electrum.blockstream.info")]),t._v(" is the default url used for testnet.")]),t._v(" "),a("p",[t._v("Using "),a("code",[t._v("mnemonic")]),t._v(" is a quick way to create a new wallet with "),a("code",[t._v("bdk-rn")]),t._v(". The "),a("code",[t._v("createWallet()")]),t._v(" method in "),a("code",[t._v("bdk-rn")]),t._v(" has many optional arguments to configure the wallet. In addition to mnemonic, a wallet can also be created with a descriptor. If a descriptor is passed as an argument the wallet will be created using the descriptor. When using a descriptor, arguments for network, password and mnemonic are not required. "),a("code",[t._v("bdk-rn")]),t._v(" has a "),a("code",[t._v("createDescriptor()")]),t._v(" method to create a descriptor. More about output descriptors "),a("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),a("OutboundLink")],1),t._v(". Refer to the "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn#createdescriptor",target:"_blank",rel:"noopener noreferrer"}},[t._v("readme"),a("OutboundLink")],1),t._v(" for all options available when creating output descriptors with "),a("code",[t._v("bdk-rn")])]),t._v(" "),a("div",{staticClass:"language-javascript extra-class"},[a("pre",{pre:!0,attrs:{class:"language-javascript"}},[a("code",[a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// using a descriptor to create wallet ")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("const")]),t._v(" response "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("await")]),t._v(" BdkRn"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("createWallet")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token literal-property property"}},[t._v("descriptor")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v("'tprv8ZgxMBicQKsPd3G66kPkZEuJZgUK9QXJRYCwnCtYLJjEZmw8xFjCxGoyx533AL83XFcSQeuVmVeJbZai5RTBxDp71Abd2FPSyQumRL79BKw'")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),a("p",[t._v("Other arguments for "),a("code",[t._v("createWallet()")]),t._v(" are:")]),t._v(" "),a("p",[a("strong",[t._v("blockChainName")]),t._v(": Blockchain backend to use, like "),a("a",{attrs:{href:"https://github.com/romanz/electrs",target:"_blank",rel:"noopener noreferrer"}},[a("code",[t._v("electrum")]),a("OutboundLink")],1),t._v(", "),a("a",{attrs:{href:"https://github.com/Blockstream/esplora",target:"_blank",rel:"noopener noreferrer"}},[a("code",[t._v("esplora")]),a("OutboundLink")],1),t._v(", "),a("code",[t._v("compact-filters")]),t._v(" ("),a("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0157.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[t._v("BIP157"),a("OutboundLink")],1),t._v(") and Bitcoin Core. "),a("code",[t._v("bdk-rn")]),t._v(" at the moment doesn't support compact-filters and Bitcoin Core, this will be added shortly in a future release.")]),t._v(" "),a("p",[a("strong",[t._v("blockChainConfigUrl")]),t._v(": This is the url of the specified bitcoin node this should match the chain and the type of blockchain specified as "),a("strong",[t._v("blockChainName")])]),t._v(" "),a("p",[t._v("Refer to "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn#createwallet",target:"_blank",rel:"noopener noreferrer"}},[t._v("readme"),a("OutboundLink")],1),t._v(" for a complete list of options for "),a("code",[t._v("createWallet")])]),t._v(" "),a("h2",{attrs:{id:"utxos-and-balance"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#utxos-and-balance"}},[t._v("#")]),t._v(" UTXOs and balance")]),t._v(" "),a("p",[t._v("With the wallet created, we can now add methods to sync UTXOs compute balance.")]),t._v(" "),a("p",[a("code",[t._v("bdk-rn")]),t._v(" has a "),a("code",[t._v("syncWallet")]),t._v(" method to sync all UTXOs belonging to the wallet with the bitcoin network, the specified "),a("code",[t._v("blockChainName")]),t._v(" and "),a("code",[t._v("blockChainConfigUrl")]),t._v(" is used to sync. Once the wallet sync is complete balance is computed and "),a("code",[t._v("getBalance")]),t._v(" can fetch the balance.")]),t._v(" "),a("p",[t._v("Earlier we have aleady added state variables for"),a("code",[t._v("syncResponse")]),t._v("and "),a("code",[t._v("balance")]),t._v(". Now we will add buttons to call "),a("code",[t._v("syncWallet")]),t._v(" and "),a("code",[t._v("getBalance")]),t._v(". Just below the Create Wallet button lets add two buttons as follows:")]),t._v(" "),a("div",{staticClass:"language-jsx extra-class"},[a("pre",{pre:!0,attrs:{class:"language-jsx"}},[a("code",[t._v(" "),a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Button")])]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("title")]),a("span",{pre:!0,attrs:{class:"token attr-value"}},[a("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[t._v("=")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("Sync Wallet"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("style")]),a("span",{pre:!0,attrs:{class:"token script language-javascript"}},[a("span",{pre:!0,attrs:{class:"token script-punctuation 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"),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("title")]),a("span",{pre:!0,attrs:{class:"token attr-value"}},[a("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[t._v("=")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("Get Balance"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("style")]),a("span",{pre:!0,attrs:{class:"token script language-javascript"}},[a("span",{pre:!0,attrs:{class:"token script-punctuation punctuation"}},[t._v("=")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("styles"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("methodButton"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")])]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("onPress")]),a("span",{pre:!0,attrs:{class:"token script language-javascript"}},[a("span",{pre:!0,attrs:{class:"token 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operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("await")]),t._v(" BdkRn"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("getBalance")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("setBalance")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("data"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("setDisplayText")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("data"),a("span",{pre:!0,attrs:{class:"token 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Before we do that add one more method to generate a new address we can then use this address to get testnet coins from a faucet.")]),t._v(" "),a("p",[t._v("Let's add a state variable for "),a("code",[t._v("address")]),t._v(", a button for "),a("strong",[t._v("Get Address")]),t._v(" and a click event handler to call "),a("code",[t._v("bdk-rn")]),t._v(" and create a new address. Let's do the following")]),t._v(" "),a("p",[t._v("Add "),a("code",[t._v("address")]),t._v(" and "),a("code",[t._v("setAddress")]),t._v(" state variables below balance and "),a("code",[t._v("setBalance")]),t._v(":")]),t._v(" "),a("div",{staticClass:"language-javascript extra-class"},[a("pre",{pre:!0,attrs:{class:"language-javascript"}},[a("code",[t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("const")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("address"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" setAddress"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("useState")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token 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"),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("setDisplayText")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("data"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),a("p",[t._v("And a Get Address button below the existing Get Balance button:")]),t._v(" "),a("div",{staticClass:"language-jsx extra-class"},[a("pre",{pre:!0,attrs:{class:"language-jsx"}},[a("code",[a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Button")])]),t._v("\n\t"),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("title")]),a("span",{pre:!0,attrs:{class:"token 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"),a("h2",{attrs:{id:"restoring-wallet"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#restoring-wallet"}},[t._v("#")]),t._v(" Restoring wallet")]),t._v(" "),a("p",[t._v("The "),a("code",[t._v("createWallet")]),t._v(" method creates a wallet using a "),a("code",[t._v("mnemonic")]),t._v(", in order to restore we can use the same method, we won't need to call "),a("code",[t._v("generateMnemonic")]),t._v(" as we will already have a "),a("code",[t._v("mnemonic")]),t._v(" to restore with.")]),t._v(" "),a("p",[t._v("Let's add an input box to enter our own "),a("code",[t._v("mnemonic")]),t._v(", we will use the "),a("code",[t._v("mnemonic")]),t._v(" entered in the input box to create a wallet.")]),t._v(" "),a("p",[t._v("Let's add an input box for "),a("code",[t._v("mnemonic")]),t._v(" below the Generate Mnemonic button.")]),t._v(" "),a("div",{staticClass:"language-jsx extra-class"},[a("pre",{pre:!0,attrs:{class:"language-jsx"}},[a("code",[a("span",{pre:!0,attrs:{class:"token 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display the mnemonic state variable in the input box, if we click Generate Mnemonic the generated mnemonic will show up in the input box. We can overwrite it with our own mnemonic and doing so will also overwrite the mnemonic state variable. This way the mnemonic displayed will be the one used to create the wallet.")]),t._v(" "),a("p",[t._v("we are already using the mnemonic state variable in the "),a("code",[t._v("createWallet")]),t._v(" Method so no other changes are required.")]),t._v(" "),a("p",[t._v("We can now use our own mnemonic and use it to restore a wallet. This will come in handy if we have a wallet with testnet bitcoin as these are hard to come by.")]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0px auto",zoom:"50%"},attrs:{src:s(366)}}),t._v(" "),a("h2",{attrs:{id:"sending-bitcoin"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#sending-bitcoin"}},[t._v("#")]),t._v(" Sending bitcoin")]),t._v(" "),a("p",[t._v("We are now able to receive bitcoin, time to add functionality to send as well.")]),t._v(" "),a("p",[a("code",[t._v("bdk-rn")]),t._v(" has a number of transaction-related methods to enable varied use cases. A new send transaction can be created and broadcast using "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn#quicksend",target:"_blank",rel:"noopener noreferrer"}},[t._v("quickSend()"),a("OutboundLink")],1),t._v(". If required an unsigned transaction can be created using "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn#createtransaction",target:"_blank",rel:"noopener noreferrer"}},[t._v("createTransaction()"),a("OutboundLink")],1),t._v(" , this can be signed later with "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn#signtransaction",target:"_blank",rel:"noopener noreferrer"}},[t._v("signTransactioin()"),a("OutboundLink")],1),t._v(" method and broadcast using "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn#broadcasttransaction",target:"_blank",rel:"noopener noreferrer"}},[t._v("broadcastTransaction()"),a("OutboundLink")],1),t._v(". There are also methods to query transactions by pending or confirmed status and all transactions. Please refer to "),a("code",[t._v("bdk-rn")]),t._v(" "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn/blob/main/README.md#gettransactions",target:"_blank",rel:"noopener noreferrer"}},[t._v("readme"),a("OutboundLink")],1),t._v(" for more details on all the methods.")]),t._v(" "),a("p",[t._v("We will need state variables for recipient address and amount as well as for transaction, these can be added below our existing variables for syncResponse and address")]),t._v(" "),a("div",{staticClass:"language-javascript extra-class"},[a("pre",{pre:!0,attrs:{class:"language-javascript"}},[a("code",[t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("const")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("syncResponse"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" setSyncResponse"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token 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punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),a("p",[t._v("A click event handler for send button, we will use the "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn#quicksend",target:"_blank",rel:"noopener noreferrer"}},[a("code",[t._v("quickSend()")]),a("OutboundLink")],1),t._v(" method to send specified amount in sats to address.")]),t._v(" "),a("div",{staticClass:"language-javascript extra-class"},[a("pre",{pre:!0,attrs:{class:"language-javascript"}},[a("code",[t._v("\t"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("const")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token function-variable function"}},[t._v("sendTx")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("async")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token 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We will need an input box for the receiver address and an input box for the amount to send. We will also need a button to trigger the transaction.")]),t._v(" "),a("p",[t._v("Let's add the send transaction section and UI components below "),a("code",[t._v("{/* input boxes and send transaction button */}")])]),t._v(" "),a("div",{staticClass:"language-jsx extra-class"},[a("pre",{pre:!0,attrs:{class:"language-jsx"}},[a("code",[t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("/* input boxes and send transaction button */")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("View")])]),t._v(" "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("style")]),a("span",{pre:!0,attrs:{class:"token script language-javascript"}},[a("span",{pre:!0,attrs:{class:"token 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attr-equals"}},[t._v("=")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("Send Transaction"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("style")]),a("span",{pre:!0,attrs:{class:"token script language-javascript"}},[a("span",{pre:!0,attrs:{class:"token script-punctuation punctuation"}},[t._v("=")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("styles"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("methodButton"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")])]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("onPress")]),a("span",{pre:!0,attrs:{class:"token script language-javascript"}},[a("span",{pre:!0,attrs:{class:"token script-punctuation punctuation"}},[t._v("=")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("sendTx"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")])]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("/>")])]),a("span",{pre:!0,attrs:{class:"token plain-text"}},[t._v("\n ")]),a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("")])]),a("span",{pre:!0,attrs:{class:"token plain-text"}},[t._v("\n ")]),a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("")])]),t._v("\n")])])]),a("p",[t._v("We should now be able to send a transaction as long as there is sufficient balance.")]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0px auto",zoom:"50%"},attrs:{src:s(367)}}),t._v(" "),a("h2",{attrs:{id:"conclusion"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#conclusion"}},[t._v("#")]),t._v(" Conclusion")]),t._v(" "),a("p",[t._v("The App we created can be built and distributed for both iOS and Android thus sharing a code base and reducing development time. The development and coding focused on application-level code for use cases and we did not have to code intricate internal bitcoin protocol-level code or bitcoin node interactions, and transactions. UTXOs and sync-related functionalities were also not required. All this was managed by "),a("code",[t._v("bdk-rn")]),t._v(" allowing us to focus on the product, functionality and user journey. This is how "),a("code",[t._v("bdk")]),t._v(" and "),a("code",[t._v("bdk-rn")]),t._v(" intend to make Rapid Bitcoin Application Development possible by allowing product and application developers to focus on what they know best while "),a("code",[t._v("bdk")]),t._v(" handles bitcoin complexity.")]),t._v(" "),a("p",[a("code",[t._v("bdk-rn")]),t._v(" intends to expose functionality and APIs from "),a("code",[t._v("bdk")]),t._v(" which has a wide variety of API with granular details allowing for many interesting use cases to be implemented. "),a("code",[t._v("bdk-rn")]),t._v(" and "),a("code",[t._v("bdk")]),t._v(" are constantly updated and enhanced based on feedback from product teams and developers in the bitcoin community.")]),t._v(" "),a("p",[t._v("Stay tuned for more APIs and enhancements coming to "),a("code",[t._v("bdk-rn")]),t._v(" in the near future. Feature and API requests are most welcome. New blogs and tutorials will be published soon for a more in-depth exploration of bdk-rn.")]),t._v(" "),a("p",[t._v("In the meantime keep in touch with the project by following on "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn",target:"_blank",rel:"noopener noreferrer"}},[t._v("GitHub"),a("OutboundLink")],1),t._v(" and "),a("a",{attrs:{href:"https://twitter.com/BitcoinZavior",target:"_blank",rel:"noopener noreferrer"}},[t._v("Twitter"),a("OutboundLink")],1)]),t._v(" "),a("h4",{attrs:{id:"references"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#references"}},[t._v("#")]),t._v(" References:")]),t._v(" "),a("ul",[a("li",[a("a",{attrs:{href:"https://github.com/bitcoindevkit",target:"_blank",rel:"noopener noreferrer"}},[t._v("bdk"),a("OutboundLink")],1)]),t._v(" "),a("li",[a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn",target:"_blank",rel:"noopener noreferrer"}},[t._v("bdk-rn"),a("OutboundLink")],1)]),t._v(" "),a("li",[a("a",{attrs:{href:"https://www.youtube.com/watch?v=gMpWA875go4",target:"_blank",rel:"noopener noreferrer"}},[t._v("Bitcoin Developers YouTube"),a("OutboundLink")],1)]),t._v(" "),a("li",[a("a",{attrs:{href:"https://github.com/LtbLightning/BdkRnQuickStart",target:"_blank",rel:"noopener noreferrer"}},[t._v("BdkRnQuickStart App GitHub Repository"),a("OutboundLink")],1)]),t._v(" "),a("li",[a("a",{attrs:{href:"https://reactnative.dev/docs/environment-setup",target:"_blank",rel:"noopener noreferrer"}},[t._v("Setup React Native Development Environment"),a("OutboundLink")],1)]),t._v(" "),a("li",[a("a",{attrs:{href:"https://github.com/bitcoinbook/bitcoinbook/blob/develop/ch04.asciidoc",target:"_blank",rel:"noopener noreferrer"}},[t._v("Mastering Bitcoin(HD Wallet chapter)"),a("OutboundLink")],1)]),t._v(" "),a("li",[a("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md",target:"_blank",rel:"noopener noreferrer"}},[t._v("Bitcoin Output Descriptors from bitcoin GitHub"),a("OutboundLink")],1)]),t._v(" "),a("li",[t._v("Testnet Faucet: "),a("a",{attrs:{href:"https://coinfaucet.eu/en/btc-testnet/",target:"_blank",rel:"noopener noreferrer"}},[t._v("https://coinfaucet.eu/en/btc-testnet/"),a("OutboundLink")],1),t._v(" or "),a("a",{attrs:{href:"https://bitcoinfaucet.uo1.net",target:"_blank",rel:"noopener noreferrer"}},[t._v("https://bitcoinfaucet.uo1.net"),a("OutboundLink")],1)])])])}),[],!1,null,null,null);a.default=e.exports}}]); \ No newline at end of file +(window.webpackJsonp=window.webpackJsonp||[]).push([[21],{347:function(t,a,s){t.exports=s.p+"assets/img/bdk_rn_complete_app.e382f61c.png"},348:function(t,a,s){t.exports=s.p+"assets/img/default_rn_app.9e60b4fb.png"},349:function(t,a,s){t.exports=s.p+"assets/img/folder_structure.d1c95bd6.png"},350:function(t,a,s){t.exports=s.p+"assets/img/bdk_rn_title.289f266d.png"},351:function(t,a,s){t.exports=s.p+"assets/img/bdk_rn_tutorial_screen_mnemonic.9963c418.png"},352:function(t,a,s){t.exports=s.p+"assets/img/bdk_rn_tutorial_screen_createwallet.916f2610.png"},353:function(t,a,s){t.exports=s.p+"assets/img/bdk_rn_get_balance.75af17bf.png"},354:function(t,a,s){t.exports=s.p+"assets/img/bdk_rn_get_address.4f570fb2.png"},355:function(t,a,s){t.exports=s.p+"assets/img/bdk_rn_get_restore.134b3681.png"},356:function(t,a,s){t.exports=s.p+"assets/img/bdk_rn_send.4e9dbc4a.png"},394:function(t,a,s){"use strict";s.r(a);var n=s(7),e=Object(n.a)({},(function(){var t=this,a=t._self._c;return a("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[a("h2",{attrs:{id:"introduction"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#introduction"}},[t._v("#")]),t._v(" Introduction")]),t._v(" "),a("p",[a("code",[t._v("bdk-rn")]),t._v(" is the "),a("strong",[t._v("Bitcoin Dev kit")]),t._v("'s "),a("strong",[t._v("React Native")]),t._v(" library which enables building bitcoin applications for Android and iOS mobile platforms. Using "),a("code",[t._v("bdk-rn")]),t._v(" does not require knowledge of the underlying bitcoin or BDK API. Using "),a("code",[t._v("bdk-rn")]),t._v(" is similar to using any other RN module. Just do "),a("code",[t._v("yarn add bdk-rn")]),t._v(" and you are ready to code! This is the first tutorial on how to use "),a("code",[t._v("bdk-rn")]),t._v(", more coming soon, make sure to "),a("a",{attrs:{href:"https://twitter.com/BitcoinZavior?ref_src=twsrc%5Etfw",target:"_blank",rel:"noopener noreferrer"}},[t._v("follow"),a("OutboundLink")],1),t._v(" to be notified of new ones. In case you missed it, there is a recorded "),a("code",[t._v("bdk-rn")]),t._v(" focused Twitch Livestream available on the "),a("a",{attrs:{href:"https://www.youtube.com/watch?v=gMpWA875go4",target:"_blank",rel:"noopener noreferrer"}},[t._v("Bitcoin Developers"),a("OutboundLink")],1),t._v(" YouTube channel which covers most of this article, make sure to subscribe to Bitcoin Developers "),a("a",{attrs:{href:"https://www.youtube.com/channel/UCUq_ZdezVWKPvkWRicAYxLA/videos",target:"_blank",rel:"noopener noreferrer"}},[t._v("YouTube Channel"),a("OutboundLink")],1),t._v(" for more bitcoin development videos.")]),t._v(" "),a("p",[t._v("In this tutorial, we will explore "),a("code",[t._v("bdk-rn")]),t._v(" usage and the API it provides. This guide will walk through the development process and code for making a bitcoin application. The bitcoin application we create will be a non-custodial HD Wallet. The application will have the functionality to create a new wallet or restore from a known mnemonic seed phrase. This application will also be able to interact with the bitcoin network to sync UTXOs from new blocks and broadcast transactions.")]),t._v(" "),a("p",[t._v("The tutorial will focus on bitcoin and "),a("code",[t._v("bdk-rn")]),t._v(" concepts and API. So it will gloss over React Native aspects. The code for this tutorial is available on the "),a("a",{attrs:{href:"https://github.com/LtbLightning/BdkRnQuickStart",target:"_blank",rel:"noopener noreferrer"}},[t._v("LtbLightning GitHub"),a("OutboundLink")],1)]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0 auto",zoom:"50%"},attrs:{src:s(347),alt:"BDK RN Quick Start"}}),t._v(" "),a("h3",{attrs:{id:"prerequisites"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#prerequisites"}},[t._v("#")]),t._v(" Prerequisites")]),t._v(" "),a("p",[t._v("In order to use "),a("code",[t._v("bdk-rn")]),t._v(" in a React Native App, a React Native development environment is required. Please refer to resources out there on the internet if you need to set this up, here is one of many good resources to guide you on "),a("a",{attrs:{href:"https://reactnative.dev/docs/environment-setup",target:"_blank",rel:"noopener noreferrer"}},[t._v("environment setup"),a("OutboundLink")],1)]),t._v(" "),a("h3",{attrs:{id:"bitcoin-basics"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#bitcoin-basics"}},[t._v("#")]),t._v(" Bitcoin Basics")]),t._v(" "),a("p",[t._v("The bitcoin concepts used in this blog post are detailed and explained very well in external bitcoin resources. Here are some links for reference:")]),t._v(" "),a("p",[a("a",{attrs:{href:"https://github.com/bitcoinbook/bitcoinbook/blob/develop/ch04.asciidoc",target:"_blank",rel:"noopener noreferrer"}},[t._v("Mastering Bitcoin(HD Wallet chapter)"),a("OutboundLink")],1)]),t._v(" "),a("p",[a("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md",target:"_blank",rel:"noopener noreferrer"}},[t._v("Bitcoin Output Descriptors from bitcoin GitHub"),a("OutboundLink")],1)]),t._v(" "),a("p",[t._v("Now let's jump into Bitcoin Dev Kit")]),t._v(" "),a("h2",{attrs:{id:"bitcoin-dev-kit-and-bdk-rn"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#bitcoin-dev-kit-and-bdk-rn"}},[t._v("#")]),t._v(" Bitcoin Dev Kit and bdk-rn")]),t._v(" "),a("p",[a("code",[t._v("bdk-rn")]),t._v(" is a React Native library of Bitcoin Dev Kit(BDK) for building React Native Apps.\nIt encapsulates all of the low-level APIs and methods for BDK and exposes them in a react native context. To use BDK in React Native(RN) apps only the "),a("code",[t._v("bdk-rn")]),t._v(" module is required. "),a("code",[t._v("Bdk-rn")]),t._v(" can be used like any other react native library and is available on "),a("a",{attrs:{href:"https://www.npmjs.com/package/bdk-rn",target:"_blank",rel:"noopener noreferrer"}},[t._v("public package managers(npm and yarn)"),a("OutboundLink")],1),t._v(".")]),t._v(" "),a("h2",{attrs:{id:"getting-started"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#getting-started"}},[t._v("#")]),t._v(" Getting Started")]),t._v(" "),a("p",[t._v("Although we won't delve deep into RN we will focus more on bitcoin and bdk-rn, however, some rudimentary RN setup is required, especially a basic RN app to add our code.")]),t._v(" "),a("p",[t._v("start by creating a new RN project.")]),t._v(" "),a("p",[a("code",[t._v("npx react-native init BdkRnQuickStart")])]),t._v(" "),a("p",[t._v("If this fails in an error on an M1/M2 Mac please use\n"),a("code",[t._v("arch -x86_64 pod install --repo-update")])]),t._v(" "),a("p",[t._v("Once done "),a("code",[t._v("cd")]),t._v(" into the new project directory and run the basic RN app that's created")]),t._v(" "),a("div",{staticClass:"language-shell extra-class"},[a("pre",{pre:!0,attrs:{class:"language-shell"}},[a("code",[a("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("cd")]),t._v(" BdkRnQuickStart\n"),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("yarn")]),t._v(" ios\n")])])]),a("p",[t._v("This should start building the app and launch the app in a simulator. So far we have created a basic RN project if this doesn't work then refer to the React Native development setup guide to troubleshoot.")]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0 auto",zoom:"25%"},attrs:{src:s(348)}}),t._v(" "),a("h2",{attrs:{id:"setting-up-styles-and-rn-app-structure"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#setting-up-styles-and-rn-app-structure"}},[t._v("#")]),t._v(" Setting up styles and RN app structure")]),t._v(" "),a("p",[t._v("Let's set up a very basic app structure and some RN scaffolding. Let's create an "),a("code",[t._v("src")]),t._v(" folder in the project root and inside it add new folders for "),a("code",[t._v("assets")]),t._v(", "),a("code",[t._v("elements")]),t._v(", "),a("code",[t._v("screens")]),t._v(" and "),a("code",[t._v("styles")])]),t._v(" "),a("p",[t._v("To make this quick you can download the styles and images used in the tutorial from the repository. 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We will also need a button which will invoke generateMnemonic when clicked. 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button which displays the new mnemonic')]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0 auto",zoom:"50%"},attrs:{src:s(351)}}),t._v(" "),a("p",[t._v("A quick recap, we added a button to trigger a call to a method. We created a button click event handler to call bdk-rn. Set the display state variable to display the output of the call in the display section. We will follow this pattern for the remaining calls to bdk-rn.")]),t._v(" "),a("h2",{attrs:{id:"creating-a-wallet"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#creating-a-wallet"}},[t._v("#")]),t._v(" Creating a wallet")]),t._v(" "),a("p",[t._v("Before moving on to creating a wallet, let's add a section at the top to display the balance of the wallet.")]),t._v(" "),a("p",[t._v("To display the balance we will need a state variable to store the balance and a display section to display it.")]),t._v(" "),a("p",[t._v("Under the "),a("code",[t._v("mnemonic")]),t._v(" and "),a("code",[t._v("displayText")]),t._v(" variables, let's add one for "),a("code",[t._v("balance")]),t._v(" as well")]),t._v(" "),a("div",{staticClass:"language-jsx extra-class"},[a("pre",{pre:!0,attrs:{class:"language-jsx"}},[a("code",[t._v("\t"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("const")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token function-variable function"}},[t._v("Home")]),t._v(" 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function"}},[t._v("stringify")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("data"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),a("p",[t._v("A new button will be required to trigger "),a("code",[t._v("createWallet")])]),t._v(" "),a("p",[t._v("Let's add a new button just above "),a("code",[t._v("{/* input boxes and send transaction button */}")])]),t._v(" "),a("div",{staticClass:"language-jsx extra-class"},[a("pre",{pre:!0,attrs:{class:"language-jsx"}},[a("code",[t._v("\t\t\t\t"),a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token 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"),a("div",{staticClass:"language-javascript extra-class"},[a("pre",{pre:!0,attrs:{class:"language-javascript"}},[a("code",[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token string-property property"}},[t._v('"data"')]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token string-property property"}},[t._v('"address"')]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"tb1qxg8g8cdzgs09cttu3y7lc33udqc4wsesunjnhe"')]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token string-property property"}},[t._v('"error"')]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token boolean"}},[t._v("false")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("The App should now be creating a wallet when we click "),a("strong",[t._v("Create Mnemonic")]),t._v(" followed by "),a("strong",[t._v("Create Wallet")]),t._v(".")]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0 auto",zoom:"50%"},attrs:{src:s(352)}}),t._v(" "),a("p",[t._v("The wallet created is a HD wallet and the address displayed is the 0 index address for the wallet. The path used by default is 84'/1'/0'/0/* for addresses and 84'/1'/0'/1/* for change.")]),t._v(" "),a("p",[t._v("As we specified "),a("code",[t._v("testnet")]),t._v(" and did not specify "),a("code",[t._v("blockChainName")]),t._v(" and "),a("code",[t._v("blockChainConfigUrl")]),t._v(" a default testnet server will be used as the bitcoin node, "),a("code",[t._v("ssl://electrum.blockstream.info")]),t._v(" is the default url used for testnet.")]),t._v(" "),a("p",[t._v("Using "),a("code",[t._v("mnemonic")]),t._v(" is a quick way to create a new wallet with "),a("code",[t._v("bdk-rn")]),t._v(". The "),a("code",[t._v("createWallet()")]),t._v(" method in "),a("code",[t._v("bdk-rn")]),t._v(" has many optional arguments to configure the wallet. In addition to mnemonic, a wallet can also be created with a descriptor. If a descriptor is passed as an argument the wallet will be created using the descriptor. When using a descriptor, arguments for network, password and mnemonic are not required. "),a("code",[t._v("bdk-rn")]),t._v(" has a "),a("code",[t._v("createDescriptor()")]),t._v(" method to create a descriptor. More about output descriptors "),a("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),a("OutboundLink")],1),t._v(". Refer to the "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn#createdescriptor",target:"_blank",rel:"noopener noreferrer"}},[t._v("readme"),a("OutboundLink")],1),t._v(" for all options available when creating output descriptors with "),a("code",[t._v("bdk-rn")])]),t._v(" "),a("div",{staticClass:"language-javascript extra-class"},[a("pre",{pre:!0,attrs:{class:"language-javascript"}},[a("code",[a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// using a descriptor to create wallet ")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("const")]),t._v(" response "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("await")]),t._v(" BdkRn"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("createWallet")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token literal-property property"}},[t._v("descriptor")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v("'tprv8ZgxMBicQKsPd3G66kPkZEuJZgUK9QXJRYCwnCtYLJjEZmw8xFjCxGoyx533AL83XFcSQeuVmVeJbZai5RTBxDp71Abd2FPSyQumRL79BKw'")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),a("p",[t._v("Other arguments for "),a("code",[t._v("createWallet()")]),t._v(" are:")]),t._v(" "),a("p",[a("strong",[t._v("blockChainName")]),t._v(": Blockchain backend to use, like "),a("a",{attrs:{href:"https://github.com/romanz/electrs",target:"_blank",rel:"noopener noreferrer"}},[a("code",[t._v("electrum")]),a("OutboundLink")],1),t._v(", "),a("a",{attrs:{href:"https://github.com/Blockstream/esplora",target:"_blank",rel:"noopener noreferrer"}},[a("code",[t._v("esplora")]),a("OutboundLink")],1),t._v(", "),a("code",[t._v("compact-filters")]),t._v(" ("),a("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0157.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[t._v("BIP157"),a("OutboundLink")],1),t._v(") and Bitcoin Core. "),a("code",[t._v("bdk-rn")]),t._v(" at the moment doesn't support compact-filters and Bitcoin Core, this will be added shortly in a future release.")]),t._v(" "),a("p",[a("strong",[t._v("blockChainConfigUrl")]),t._v(": This is the url of the specified bitcoin node this should match the chain and the type of blockchain specified as "),a("strong",[t._v("blockChainName")])]),t._v(" "),a("p",[t._v("Refer to "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn#createwallet",target:"_blank",rel:"noopener noreferrer"}},[t._v("readme"),a("OutboundLink")],1),t._v(" for a complete list of options for "),a("code",[t._v("createWallet")])]),t._v(" "),a("h2",{attrs:{id:"utxos-and-balance"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#utxos-and-balance"}},[t._v("#")]),t._v(" UTXOs and balance")]),t._v(" "),a("p",[t._v("With the wallet created, we can now add methods to sync UTXOs compute balance.")]),t._v(" "),a("p",[a("code",[t._v("bdk-rn")]),t._v(" has a "),a("code",[t._v("syncWallet")]),t._v(" method to sync all UTXOs belonging to the wallet with the bitcoin network, the specified "),a("code",[t._v("blockChainName")]),t._v(" and "),a("code",[t._v("blockChainConfigUrl")]),t._v(" is used to sync. Once the wallet sync is complete balance is computed and "),a("code",[t._v("getBalance")]),t._v(" can fetch the balance.")]),t._v(" "),a("p",[t._v("Earlier we have aleady added state variables for"),a("code",[t._v("syncResponse")]),t._v("and "),a("code",[t._v("balance")]),t._v(". Now we will add buttons to call "),a("code",[t._v("syncWallet")]),t._v(" and "),a("code",[t._v("getBalance")]),t._v(". Just below the Create Wallet button lets add two buttons as follows:")]),t._v(" "),a("div",{staticClass:"language-jsx extra-class"},[a("pre",{pre:!0,attrs:{class:"language-jsx"}},[a("code",[t._v(" "),a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Button")])]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("title")]),a("span",{pre:!0,attrs:{class:"token attr-value"}},[a("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[t._v("=")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("Sync Wallet"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("style")]),a("span",{pre:!0,attrs:{class:"token script language-javascript"}},[a("span",{pre:!0,attrs:{class:"token script-punctuation 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"),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("title")]),a("span",{pre:!0,attrs:{class:"token attr-value"}},[a("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[t._v("=")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("Get Balance"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("style")]),a("span",{pre:!0,attrs:{class:"token script language-javascript"}},[a("span",{pre:!0,attrs:{class:"token script-punctuation punctuation"}},[t._v("=")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("styles"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("methodButton"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")])]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("onPress")]),a("span",{pre:!0,attrs:{class:"token script language-javascript"}},[a("span",{pre:!0,attrs:{class:"token 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operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("await")]),t._v(" BdkRn"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("getBalance")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("setBalance")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("data"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("setDisplayText")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("data"),a("span",{pre:!0,attrs:{class:"token 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Before we do that add one more method to generate a new address we can then use this address to get testnet coins from a faucet.")]),t._v(" "),a("p",[t._v("Let's add a state variable for "),a("code",[t._v("address")]),t._v(", a button for "),a("strong",[t._v("Get Address")]),t._v(" and a click event handler to call "),a("code",[t._v("bdk-rn")]),t._v(" and create a new address. Let's do the following")]),t._v(" "),a("p",[t._v("Add "),a("code",[t._v("address")]),t._v(" and "),a("code",[t._v("setAddress")]),t._v(" state variables below balance and "),a("code",[t._v("setBalance")]),t._v(":")]),t._v(" "),a("div",{staticClass:"language-javascript extra-class"},[a("pre",{pre:!0,attrs:{class:"language-javascript"}},[a("code",[t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("const")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("address"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" setAddress"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("useState")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token 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"),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("setDisplayText")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("data"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),a("p",[t._v("And a Get Address button below the existing Get Balance button:")]),t._v(" "),a("div",{staticClass:"language-jsx extra-class"},[a("pre",{pre:!0,attrs:{class:"language-jsx"}},[a("code",[a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Button")])]),t._v("\n\t"),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("title")]),a("span",{pre:!0,attrs:{class:"token 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"),a("h2",{attrs:{id:"restoring-wallet"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#restoring-wallet"}},[t._v("#")]),t._v(" Restoring wallet")]),t._v(" "),a("p",[t._v("The "),a("code",[t._v("createWallet")]),t._v(" method creates a wallet using a "),a("code",[t._v("mnemonic")]),t._v(", in order to restore we can use the same method, we won't need to call "),a("code",[t._v("generateMnemonic")]),t._v(" as we will already have a "),a("code",[t._v("mnemonic")]),t._v(" to restore with.")]),t._v(" "),a("p",[t._v("Let's add an input box to enter our own "),a("code",[t._v("mnemonic")]),t._v(", we will use the "),a("code",[t._v("mnemonic")]),t._v(" entered in the input box to create a wallet.")]),t._v(" "),a("p",[t._v("Let's add an input box for "),a("code",[t._v("mnemonic")]),t._v(" below the Generate Mnemonic button.")]),t._v(" "),a("div",{staticClass:"language-jsx extra-class"},[a("pre",{pre:!0,attrs:{class:"language-jsx"}},[a("code",[a("span",{pre:!0,attrs:{class:"token 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display the mnemonic state variable in the input box, if we click Generate Mnemonic the generated mnemonic will show up in the input box. We can overwrite it with our own mnemonic and doing so will also overwrite the mnemonic state variable. This way the mnemonic displayed will be the one used to create the wallet.")]),t._v(" "),a("p",[t._v("we are already using the mnemonic state variable in the "),a("code",[t._v("createWallet")]),t._v(" Method so no other changes are required.")]),t._v(" "),a("p",[t._v("We can now use our own mnemonic and use it to restore a wallet. This will come in handy if we have a wallet with testnet bitcoin as these are hard to come by.")]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0px auto",zoom:"50%"},attrs:{src:s(355)}}),t._v(" "),a("h2",{attrs:{id:"sending-bitcoin"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#sending-bitcoin"}},[t._v("#")]),t._v(" Sending bitcoin")]),t._v(" "),a("p",[t._v("We are now able to receive bitcoin, time to add functionality to send as well.")]),t._v(" "),a("p",[a("code",[t._v("bdk-rn")]),t._v(" has a number of transaction-related methods to enable varied use cases. A new send transaction can be created and broadcast using "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn#quicksend",target:"_blank",rel:"noopener noreferrer"}},[t._v("quickSend()"),a("OutboundLink")],1),t._v(". If required an unsigned transaction can be created using "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn#createtransaction",target:"_blank",rel:"noopener noreferrer"}},[t._v("createTransaction()"),a("OutboundLink")],1),t._v(" , this can be signed later with "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn#signtransaction",target:"_blank",rel:"noopener noreferrer"}},[t._v("signTransactioin()"),a("OutboundLink")],1),t._v(" method and broadcast using "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn#broadcasttransaction",target:"_blank",rel:"noopener noreferrer"}},[t._v("broadcastTransaction()"),a("OutboundLink")],1),t._v(". There are also methods to query transactions by pending or confirmed status and all transactions. Please refer to "),a("code",[t._v("bdk-rn")]),t._v(" "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn/blob/main/README.md#gettransactions",target:"_blank",rel:"noopener noreferrer"}},[t._v("readme"),a("OutboundLink")],1),t._v(" for more details on all the methods.")]),t._v(" "),a("p",[t._v("We will need state variables for recipient address and amount as well as for transaction, these can be added below our existing variables for syncResponse and address")]),t._v(" "),a("div",{staticClass:"language-javascript extra-class"},[a("pre",{pre:!0,attrs:{class:"language-javascript"}},[a("code",[t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("const")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("syncResponse"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" setSyncResponse"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token 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We will need an input box for the receiver address and an input box for the amount to send. We will also need a button to trigger the transaction.")]),t._v(" "),a("p",[t._v("Let's add the send transaction section and UI components below "),a("code",[t._v("{/* input boxes and send transaction button */}")])]),t._v(" "),a("div",{staticClass:"language-jsx extra-class"},[a("pre",{pre:!0,attrs:{class:"language-jsx"}},[a("code",[t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("/* input boxes and send transaction button */")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("View")])]),t._v(" "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("style")]),a("span",{pre:!0,attrs:{class:"token script language-javascript"}},[a("span",{pre:!0,attrs:{class:"token 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attr-equals"}},[t._v("=")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("Send Transaction"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("style")]),a("span",{pre:!0,attrs:{class:"token script language-javascript"}},[a("span",{pre:!0,attrs:{class:"token script-punctuation punctuation"}},[t._v("=")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("styles"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("methodButton"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")])]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("onPress")]),a("span",{pre:!0,attrs:{class:"token script language-javascript"}},[a("span",{pre:!0,attrs:{class:"token script-punctuation punctuation"}},[t._v("=")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("sendTx"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")])]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("/>")])]),a("span",{pre:!0,attrs:{class:"token plain-text"}},[t._v("\n ")]),a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("")])]),a("span",{pre:!0,attrs:{class:"token plain-text"}},[t._v("\n ")]),a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("")])]),t._v("\n")])])]),a("p",[t._v("We should now be able to send a transaction as long as there is sufficient balance.")]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0px auto",zoom:"50%"},attrs:{src:s(356)}}),t._v(" "),a("h2",{attrs:{id:"conclusion"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#conclusion"}},[t._v("#")]),t._v(" Conclusion")]),t._v(" "),a("p",[t._v("The App we created can be built and distributed for both iOS and Android thus sharing a code base and reducing development time. The development and coding focused on application-level code for use cases and we did not have to code intricate internal bitcoin protocol-level code or bitcoin node interactions, and transactions. UTXOs and sync-related functionalities were also not required. All this was managed by "),a("code",[t._v("bdk-rn")]),t._v(" allowing us to focus on the product, functionality and user journey. This is how "),a("code",[t._v("bdk")]),t._v(" and "),a("code",[t._v("bdk-rn")]),t._v(" intend to make Rapid Bitcoin Application Development possible by allowing product and application developers to focus on what they know best while "),a("code",[t._v("bdk")]),t._v(" handles bitcoin complexity.")]),t._v(" "),a("p",[a("code",[t._v("bdk-rn")]),t._v(" intends to expose functionality and APIs from "),a("code",[t._v("bdk")]),t._v(" which has a wide variety of API with granular details allowing for many interesting use cases to be implemented. "),a("code",[t._v("bdk-rn")]),t._v(" and "),a("code",[t._v("bdk")]),t._v(" are constantly updated and enhanced based on feedback from product teams and developers in the bitcoin community.")]),t._v(" "),a("p",[t._v("Stay tuned for more APIs and enhancements coming to "),a("code",[t._v("bdk-rn")]),t._v(" in the near future. Feature and API requests are most welcome. New blogs and tutorials will be published soon for a more in-depth exploration of bdk-rn.")]),t._v(" "),a("p",[t._v("In the meantime keep in touch with the project by following on "),a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn",target:"_blank",rel:"noopener noreferrer"}},[t._v("GitHub"),a("OutboundLink")],1),t._v(" and "),a("a",{attrs:{href:"https://twitter.com/BitcoinZavior",target:"_blank",rel:"noopener noreferrer"}},[t._v("Twitter"),a("OutboundLink")],1)]),t._v(" "),a("h4",{attrs:{id:"references"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#references"}},[t._v("#")]),t._v(" References:")]),t._v(" "),a("ul",[a("li",[a("a",{attrs:{href:"https://github.com/bitcoindevkit",target:"_blank",rel:"noopener noreferrer"}},[t._v("bdk"),a("OutboundLink")],1)]),t._v(" "),a("li",[a("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn",target:"_blank",rel:"noopener noreferrer"}},[t._v("bdk-rn"),a("OutboundLink")],1)]),t._v(" "),a("li",[a("a",{attrs:{href:"https://www.youtube.com/watch?v=gMpWA875go4",target:"_blank",rel:"noopener noreferrer"}},[t._v("Bitcoin Developers YouTube"),a("OutboundLink")],1)]),t._v(" "),a("li",[a("a",{attrs:{href:"https://github.com/LtbLightning/BdkRnQuickStart",target:"_blank",rel:"noopener noreferrer"}},[t._v("BdkRnQuickStart App GitHub Repository"),a("OutboundLink")],1)]),t._v(" "),a("li",[a("a",{attrs:{href:"https://reactnative.dev/docs/environment-setup",target:"_blank",rel:"noopener noreferrer"}},[t._v("Setup React Native Development Environment"),a("OutboundLink")],1)]),t._v(" "),a("li",[a("a",{attrs:{href:"https://github.com/bitcoinbook/bitcoinbook/blob/develop/ch04.asciidoc",target:"_blank",rel:"noopener noreferrer"}},[t._v("Mastering Bitcoin(HD Wallet chapter)"),a("OutboundLink")],1)]),t._v(" "),a("li",[a("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md",target:"_blank",rel:"noopener noreferrer"}},[t._v("Bitcoin Output Descriptors from bitcoin GitHub"),a("OutboundLink")],1)]),t._v(" "),a("li",[t._v("Testnet Faucet: "),a("a",{attrs:{href:"https://coinfaucet.eu/en/btc-testnet/",target:"_blank",rel:"noopener noreferrer"}},[t._v("https://coinfaucet.eu/en/btc-testnet/"),a("OutboundLink")],1),t._v(" or "),a("a",{attrs:{href:"https://bitcoinfaucet.uo1.net",target:"_blank",rel:"noopener noreferrer"}},[t._v("https://bitcoinfaucet.uo1.net"),a("OutboundLink")],1)])])])}),[],!1,null,null,null);a.default=e.exports}}]); \ No newline at end of file diff --git a/assets/js/31.dd5b652f.js b/assets/js/31.2e09623a.js similarity index 99% rename from assets/js/31.dd5b652f.js rename to assets/js/31.2e09623a.js index 57c0528089..940bd49eaa 100644 --- a/assets/js/31.dd5b652f.js +++ b/assets/js/31.2e09623a.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[31],{344:function(t,e,a){t.exports=a.p+"assets/img/BDK-RN-Architecture.42fbc351.png"},345:function(t,e,a){t.exports=a.p+"assets/img/BDK-RN.370f20c3.png"},346:function(t,e,a){t.exports=a.p+"assets/img/android_folder.0ff999be.png"},388:function(t,e,a){"use strict";a.r(e);var n=a(7),s=Object(n.a)({},(function(){var t=this,e=t._self._c;return e("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[e("p",[t._v("The "),e("strong",[t._v("BitcoinDevkit")]),t._v("'s "),e("strong",[t._v("React Native")]),t._v(" library ("),e("code",[t._v("bdk-rn")]),t._v(") makes it easy to develop bitcoin applications for both Android and iOS mobile platforms. Using "),e("code",[t._v("bdk-rn")]),t._v(", knowledge of the underlying bitcoin and BDK API is not required and using "),e("code",[t._v("bdk-rn")]),t._v(" is similar to using any other RN module. The goal is "),e("strong",[t._v("Rapid Bitcoin Application Development")]),t._v(" by doing the heavy lifting in advance and providing a reusable library for other developers to use. Developers simply install using "),e("code",[t._v("yarn add")]),t._v(" and start using it in a React Native Project. The native code, Rust lang implementation, configuration and other setup details are all taken care of by "),e("code",[t._v("bdk-rn")]),t._v(".")]),t._v(" "),e("p",[t._v("This article is "),e("strong",[t._v("NOT a guide on how to use bdk-rn")]),t._v(" to build a bitcoin application, rather this is an insight into how "),e("code",[t._v("bdk-rn")]),t._v(" was developed. For help on how to use "),e("code",[t._v("bdk-rn")]),t._v(" to develop a bitcoin wallet or application please refer to the user guide in the "),e("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn#usage",target:"_blank",rel:"noopener noreferrer"}},[t._v("readme"),e("OutboundLink")],1),t._v(" on Github. There will be "),e("code",[t._v("how to guides")]),t._v(" published shortly on getting started with "),e("code",[t._v("bdk-rn")]),t._v(".")]),t._v(" "),e("h2",{attrs:{id:"react-native-architecture"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#react-native-architecture"}},[t._v("#")]),t._v(" React Native Architecture")]),t._v(" "),e("p",[t._v("At a high level, RN consists of the UI front which is essentially JavaScript which interacts with the native iOS and Android platforms over a bridge. When communicating over the bridge values from JS are converted to native and vice versa.")]),t._v(" "),e("p",[t._v("The native part of RN consists of Android as well as iOS modules and components. The Android and iOS sections are full fledged native projects which interact with the JS side over the native bridge. A RN project has all the build configuraiton required to build both Android and iOS projects.")]),t._v(" "),e("p",[t._v("For the purpose of making "),e("code",[t._v("bdk-rn")]),t._v(", "),e("code",[t._v("bdk-kotlin")]),t._v(" is used as the native Android module and "),e("code",[t._v("bdk-swift")]),t._v(" as the native iOS module. These are configured and wrapped in a RN Project as part of the platform specific native modules within the RN Project. This RN Project is then built to be a reusable React Native module.")]),t._v(" "),e("figure",[e("img",{attrs:{src:a(344),alt:""}})]),t._v(" "),e("h2",{attrs:{id:"native-integration"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#native-integration"}},[t._v("#")]),t._v(" Native Integration")]),t._v(" "),e("p",[t._v("In order to communicate to native modules on Android and iOS, React Native provides React Context API for Java/Kotlin as well as Swift. React Context API are used to build the interface to the native bridge allowing communication from JS to native modules.")]),t._v(" "),e("p",[t._v("bdk-rn uses React Context API plus some native code to wrap and enhance bdk-kotlin and bdk-swift APIs. The native code calls and interacts with the Android and iOS native modules which interface with the underlying mobile platform.")]),t._v(" "),e("img",{staticStyle:{display:"block",margin:"0 auto",zoom:"20%"},attrs:{src:a(345)}}),t._v(" "),e("h2",{attrs:{id:"android-module"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#android-module"}},[t._v("#")]),t._v(" Android Module")]),t._v(" "),e("p",[t._v("We will go into the details of how the BDK Android Module is integrated, we wont cover iOS.")]),t._v(" "),e("p",[t._v("Starting off with a basic RN project. This project will be enhanced with bdk-kotlin and bdk-swift binaries and native code. For now lets go into the details for Android, iOS has similar steps to be done in Swift.")]),t._v(" "),e("p",[t._v("The Android native project is located under the root project folder.")]),t._v(" "),e("img",{staticStyle:{display:"block",margin:"0 auto",zoom:"120%"},attrs:{src:a(346)}}),t._v(" "),e("p",[t._v("Here we need to add a dependency in "),e("code",[t._v("build.gradle")]),t._v(" for bdk-kotlin's android native binary. This will enable bdk-kotlin to be downloaded and available as one of the native modules.")]),t._v(" "),e("div",{staticClass:"language-javascript extra-class"},[e("pre",{pre:!0,attrs:{class:"language-javascript"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// File: build.gradle")]),t._v("\n\nrepositories "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("mavenCentral")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\ndependencies "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("//noinspection GradleDynamicVersion")]),t._v("\n implementation "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("'com.facebook.react:react-native:+'")]),t._v("\n\n "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// bitcoindevkit")]),t._v("\n implementation "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("'org.bitcoindevkit:bdk-android:0.7.1'")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("p",[t._v("We will create an Android native module which will interact with "),e("code",[t._v("bdk-android")]),t._v(".\nThis is done by adding a new Kotlin file "),e("code",[t._v("BdkRnModule.kt")]),t._v(" inside "),e("code",[t._v("android/app/src/main/java/com/bdkrn/")]),t._v(" folder")]),t._v(" "),e("p",[t._v("This will be part of the native code for bdk-rn module.Here a new class will be created to encapsulate the interaction with bitcoindevkit's android native binary.")]),t._v(" "),e("div",{staticClass:"language-kotlin 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implement the React Context API")]),t._v(" "),e("div",{staticClass:"language-kotlin extra-class"},[e("pre",{pre:!0,attrs:{class:"language-kotlin"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// File: BdkRnModule.kt")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("BdkRnModule")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("reactContext"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" ReactApplicationContext"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v("\n\t"),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("ReactContextBaseJavaModule")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("reactContext"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("override")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fun")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("getName")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string-literal singleline"}},[e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"BdkRnModule"')])]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("p",[t._v("With the base imports and class defined, we can start writing methods.\nThis will demonstrate how bdk native module will be called and how values will be returned to JS over the native bridge")]),t._v(" "),e("p",[t._v("Lets create a method that can be called from JaveScript, to do so we use the "),e("code",[t._v("@ReactMethod")]),t._v(" directive which is part of the React Context API. This will expose the method so that it can be called from JavaScript.")]),t._v(" "),e("div",{staticClass:"language-kotlin extra-class"},[e("pre",{pre:!0,attrs:{class:"language-kotlin"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// File: BdkRnModule.kt")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token annotation builtin"}},[t._v("@ReactMethod")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fun")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("createWallet")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("result"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Promise"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n \n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("p",[t._v("We need one more file to complete our native framework. A new Kotlin file, "),e("code",[t._v("BdkRnPackage.kt")]),t._v(" is required to package all our native code into a new android module, here we specify the name of the file we just crated as the module name("),e("code",[t._v("BdkRnModule")]),t._v("). This can be done by adding the following code:")]),t._v(" "),e("div",{staticClass:"language-kotlin extra-class"},[e("pre",{pre:!0,attrs:{class:"language-kotlin"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// File: BdkRnPackage.kt")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" com"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("facebook"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("react"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("ReactPackage\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" com"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("facebook"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("react"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("bridge"),e("span",{pre:!0,attrs:{class:"token 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"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" ReactPackage "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n\n "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("override")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fun")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("createNativeModules")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("reactContext"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" ReactApplicationContext"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v("\n MutableList"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),t._v("NativeModule"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(">")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("return")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("mutableListOf")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("BdkRnModule")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("reactContext"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n")])])]),e("p",[t._v("Now lets add code for creating a wallet in BdkRnModule.kt")]),t._v(" "),e("p",[t._v("The methods used here are for bdk-kotlin and available in the bdk-kotlin documentation.")]),t._v(" "),e("p",[t._v("We first create a key info object")]),t._v(" "),e("div",{staticClass:"language-kotlin extra-class"},[e("pre",{pre:!0,attrs:{class:"language-kotlin"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// File: BdkRnModule.kt")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token annotation builtin"}},[t._v("@ReactMethod")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fun")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("createWallet")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("result"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Promise"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Create key info with a new mnemonic")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" keys"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" ExtendedKeyInfo "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("generateExtendedKey")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n Network"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("TESTNET"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n WordCount"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("WORDS12"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string-literal singleline"}},[e("span",{pre:!0,attrs:{class:"token string"}},[t._v('""')])]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n \n "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// more code to follow...")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// create descriptor and change descriptor")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// create databaseConfig and blockchainconfig")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// create wallet")]),t._v("\n \n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("p",[t._v("Then key info used to create a wallet descriptor and change descriptor:")]),t._v(" "),e("div",{staticClass:"language-kotlin extra-class"},[e("pre",{pre:!0,attrs:{class:"language-kotlin"}},[e("code",[e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" descriptor"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" String "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string-literal singleline"}},[e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"wpkh("')])]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("+")]),t._v(" keys"),e("span",{pre:!0,attrs:{class:"token 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We intend to use bitcoin testnet and want to use default memory for data. For bitcoin node we will use a public electrum server. We will need to define these parameters to create a wallet.")]),t._v(" "),e("div",{staticClass:"language-kotlin extra-class"},[e("pre",{pre:!0,attrs:{class:"language-kotlin"}},[e("code",[e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" network "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" `Network"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("TESTNET`\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" databaseConfig "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" DatabaseConfig"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("Memory\nblockchainConfig "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("\n BlockchainConfig"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("Electrum")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("ElectrumConfig")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token string-literal singleline"}},[e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"ssl://electrum.blockstream.info:60002"')])]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("null")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" 5u"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("null")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" 10u"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),e("p",[t._v("Once done we can use these parameters to create a BDK wallet using the native android BDK library:")]),t._v(" "),e("div",{staticClass:"language-kotlin extra-class"},[e("pre",{pre:!0,attrs:{class:"language-kotlin"}},[e("code",[e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("var")]),t._v(" wallet"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" BdkWallet "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("BdkWallet")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n descriptor"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n changeDescriptor"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("setNetwork")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("network"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n databaseConfig"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n config\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),e("p",[t._v("Once we have a wallet initialised, we can call methods on it to sync, generate a new address and to get balance")]),t._v(" "),e("div",{staticClass:"language-kotlin extra-class"},[e("pre",{pre:!0,attrs:{class:"language-kotlin"}},[e("code",[t._v("wallet"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("ProgressLog"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" maxAddress"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\nwallet"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("getNewAddress")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\nwallet"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("getBalance")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("toLong")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),e("p",[t._v("To return a value from the native android code to React Native’s Javascript side over the JS Native bridge we will use "),e("code",[t._v("com.facebook.react.bridge.Promise")]),t._v(". To return balance information to JS, the following code can be used")]),t._v(" "),e("div",{staticClass:"language-kotlin extra-class"},[e("pre",{pre:!0,attrs:{class:"language-kotlin"}},[e("code",[e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" balance"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" String "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" wallet"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("getBalance")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("toLong")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\nresult"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("resolve")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("balance"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),e("p",[t._v("At this point we have an Android native module and it can be invoked from JS by calling "),e("code",[t._v("createWallet")]),t._v(" and it will return the balance.")]),t._v(" "),e("p",[t._v("This project can be imported into any RN project to reuse the defined "),e("code",[t._v("createWallet")]),t._v(" method without the need to carry out the setup described above.")]),t._v(" "),e("div",{staticClass:"language-javascript extra-class"},[e("pre",{pre:!0,attrs:{class:"language-javascript"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// any js file in React Native")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" BdkRn "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("from")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("'bdk-rn'")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// create a wallet and retrieve current balance")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("const")]),t._v(" balance "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("await")]),t._v(" BdkRn"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("createWallet")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\nconsole"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("log")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v(" balance "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\n")])])]),e("p",[t._v("The actual "),e("code",[t._v("bdk-rn")]),t._v(" module has organised the native code into granular methods for different stages of creating a wallet and for different interactions and use cases for a bitcoin application, like generating, mnemonic, keys, creating wallet for different networks, creating descriptors, creating or restoring wallet, fetching balance, fetching transactions and many other methods. Please refer to the "),e("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn#usage",target:"_blank",rel:"noopener noreferrer"}},[t._v("user guide in the readme"),e("OutboundLink")],1),t._v(" on Github for the complete API. The set of APIs available will grow in the near future as more APIs are added. This article can also be used as a guide to add new methods to the existing bdk-rn project.")]),t._v(" "),e("p",[t._v("The objective of "),e("code",[t._v("bdk-rn")]),t._v(" is to enable React Native developers to quickly start developing applications without the need to package BDK as described above.")]),t._v(" "),e("p",[t._v("Be on the lookout for user guides and tutorials on how to build bitcoin applications using "),e("code",[t._v("bdk-rn")]),t._v(" and "),e("code",[t._v("bdk-flutter")]),t._v(".")]),t._v(" "),e("h2",{attrs:{id:"references"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#references"}},[t._v("#")]),t._v(" References")]),t._v(" "),e("p",[t._v("Creating native modules for Android and iOS: "),e("a",{attrs:{href:"https://reactnative.dev/docs/native-modules-intro",target:"_blank",rel:"noopener noreferrer"}},[t._v("https://reactnative.dev/docs/native-modules-intro"),e("OutboundLink")],1)]),t._v(" "),e("p",[t._v("React Native Architecture: "),e("a",{attrs:{href:"https://www.reactnative.guide/3-react-native-internals/3.1-react-native-internals.html",target:"_blank",rel:"noopener noreferrer"}},[t._v("https://www.reactnative.guide/3-react-native-internals/3.1-react-native-internals.html"),e("OutboundLink")],1)]),t._v(" "),e("p",[t._v("BDK-Android API: "),e("a",{attrs:{href:"https://bitcoindevkit.org/bdk-jvm/bdk-jvm/org.bitcoindevkit/index.html",target:"_blank",rel:"noopener noreferrer"}},[t._v("https://bitcoindevkit.org/bdk-jvm/bdk-jvm/org.bitcoindevkit/index.html"),e("OutboundLink")],1)]),t._v(" "),e("p",[t._v("BDK-RN: "),e("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn",target:"_blank",rel:"noopener noreferrer"}},[t._v("https://github.com/LtbLightning/bdk-rn"),e("OutboundLink")],1)]),t._v(" "),e("h2",{attrs:{id:"feedback"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#feedback"}},[t._v("#")]),t._v(" Feedback")]),t._v(" "),e("p",[t._v("The best way to give feedback on this would be to comment on the "),e("a",{attrs:{href:"https://github.com/bitcoindevkit/bitcoindevkit.org/pull/107",target:"_blank",rel:"noopener noreferrer"}},[t._v("pull request"),e("OutboundLink")],1),t._v(" for this blog post.\nThanks in advance.")])])}),[],!1,null,null,null);e.default=s.exports}}]); \ No newline at end of file +(window.webpackJsonp=window.webpackJsonp||[]).push([[31],{344:function(t,e,a){t.exports=a.p+"assets/img/BDK-RN-Architecture.42fbc351.png"},345:function(t,e,a){t.exports=a.p+"assets/img/BDK-RN.370f20c3.png"},346:function(t,e,a){t.exports=a.p+"assets/img/android_folder.0ff999be.png"},391:function(t,e,a){"use strict";a.r(e);var n=a(7),s=Object(n.a)({},(function(){var t=this,e=t._self._c;return e("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[e("p",[t._v("The "),e("strong",[t._v("BitcoinDevkit")]),t._v("'s "),e("strong",[t._v("React Native")]),t._v(" library ("),e("code",[t._v("bdk-rn")]),t._v(") makes it easy to develop bitcoin applications for both Android and iOS mobile platforms. Using "),e("code",[t._v("bdk-rn")]),t._v(", knowledge of the underlying bitcoin and BDK API is not required and using "),e("code",[t._v("bdk-rn")]),t._v(" is similar to using any other RN module. The goal is "),e("strong",[t._v("Rapid Bitcoin Application Development")]),t._v(" by doing the heavy lifting in advance and providing a reusable library for other developers to use. Developers simply install using "),e("code",[t._v("yarn add")]),t._v(" and start using it in a React Native Project. The native code, Rust lang implementation, configuration and other setup details are all taken care of by "),e("code",[t._v("bdk-rn")]),t._v(".")]),t._v(" "),e("p",[t._v("This article is "),e("strong",[t._v("NOT a guide on how to use bdk-rn")]),t._v(" to build a bitcoin application, rather this is an insight into how "),e("code",[t._v("bdk-rn")]),t._v(" was developed. For help on how to use "),e("code",[t._v("bdk-rn")]),t._v(" to develop a bitcoin wallet or application please refer to the user guide in the "),e("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn#usage",target:"_blank",rel:"noopener noreferrer"}},[t._v("readme"),e("OutboundLink")],1),t._v(" on Github. There will be "),e("code",[t._v("how to guides")]),t._v(" published shortly on getting started with "),e("code",[t._v("bdk-rn")]),t._v(".")]),t._v(" "),e("h2",{attrs:{id:"react-native-architecture"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#react-native-architecture"}},[t._v("#")]),t._v(" React Native Architecture")]),t._v(" "),e("p",[t._v("At a high level, RN consists of the UI front which is essentially JavaScript which interacts with the native iOS and Android platforms over a bridge. When communicating over the bridge values from JS are converted to native and vice versa.")]),t._v(" "),e("p",[t._v("The native part of RN consists of Android as well as iOS modules and components. The Android and iOS sections are full fledged native projects which interact with the JS side over the native bridge. A RN project has all the build configuraiton required to build both Android and iOS projects.")]),t._v(" "),e("p",[t._v("For the purpose of making "),e("code",[t._v("bdk-rn")]),t._v(", "),e("code",[t._v("bdk-kotlin")]),t._v(" is used as the native Android module and "),e("code",[t._v("bdk-swift")]),t._v(" as the native iOS module. These are configured and wrapped in a RN Project as part of the platform specific native modules within the RN Project. This RN Project is then built to be a reusable React Native module.")]),t._v(" "),e("figure",[e("img",{attrs:{src:a(344),alt:""}})]),t._v(" "),e("h2",{attrs:{id:"native-integration"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#native-integration"}},[t._v("#")]),t._v(" Native Integration")]),t._v(" "),e("p",[t._v("In order to communicate to native modules on Android and iOS, React Native provides React Context API for Java/Kotlin as well as Swift. React Context API are used to build the interface to the native bridge allowing communication from JS to native modules.")]),t._v(" "),e("p",[t._v("bdk-rn uses React Context API plus some native code to wrap and enhance bdk-kotlin and bdk-swift APIs. The native code calls and interacts with the Android and iOS native modules which interface with the underlying mobile platform.")]),t._v(" "),e("img",{staticStyle:{display:"block",margin:"0 auto",zoom:"20%"},attrs:{src:a(345)}}),t._v(" "),e("h2",{attrs:{id:"android-module"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#android-module"}},[t._v("#")]),t._v(" Android Module")]),t._v(" "),e("p",[t._v("We will go into the details of how the BDK Android Module is integrated, we wont cover iOS.")]),t._v(" "),e("p",[t._v("Starting off with a basic RN project. This project will be enhanced with bdk-kotlin and bdk-swift binaries and native code. For now lets go into the details for Android, iOS has similar steps to be done in Swift.")]),t._v(" "),e("p",[t._v("The Android native project is located under the root project folder.")]),t._v(" "),e("img",{staticStyle:{display:"block",margin:"0 auto",zoom:"120%"},attrs:{src:a(346)}}),t._v(" "),e("p",[t._v("Here we need to add a dependency in "),e("code",[t._v("build.gradle")]),t._v(" for bdk-kotlin's android native binary. This will enable bdk-kotlin to be downloaded and available as one of the native modules.")]),t._v(" "),e("div",{staticClass:"language-javascript extra-class"},[e("pre",{pre:!0,attrs:{class:"language-javascript"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// File: build.gradle")]),t._v("\n\nrepositories "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("mavenCentral")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\ndependencies "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("//noinspection GradleDynamicVersion")]),t._v("\n implementation "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("'com.facebook.react:react-native:+'")]),t._v("\n\n "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// bitcoindevkit")]),t._v("\n implementation "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("'org.bitcoindevkit:bdk-android:0.7.1'")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("p",[t._v("We will create an Android native module which will interact with "),e("code",[t._v("bdk-android")]),t._v(".\nThis is done by adding a new Kotlin file "),e("code",[t._v("BdkRnModule.kt")]),t._v(" inside "),e("code",[t._v("android/app/src/main/java/com/bdkrn/")]),t._v(" folder")]),t._v(" "),e("p",[t._v("This will be part of the native code for bdk-rn module.Here a new class will be created to encapsulate the interaction with bitcoindevkit's android native binary.")]),t._v(" "),e("div",{staticClass:"language-kotlin 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punctuation"}},[t._v(".")]),t._v("bridge"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("Arguments\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" com"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("facebook"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("react"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("bridge"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("Promise "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("as")]),t._v(" Result\n")])])]),e("p",[e("code",[t._v("org.bitcoindevkit")]),t._v(" will also need to be imported here")]),t._v(" "),e("div",{staticClass:"language-kotlin extra-class"},[e("pre",{pre:!0,attrs:{class:"language-kotlin"}},[e("code",[e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" org"),e("span",{pre:!0,attrs:{class:"token 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implement the React Context API")]),t._v(" "),e("div",{staticClass:"language-kotlin extra-class"},[e("pre",{pre:!0,attrs:{class:"language-kotlin"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// File: BdkRnModule.kt")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("BdkRnModule")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("reactContext"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" ReactApplicationContext"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v("\n\t"),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("ReactContextBaseJavaModule")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("reactContext"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("override")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fun")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("getName")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string-literal singleline"}},[e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"BdkRnModule"')])]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("p",[t._v("With the base imports and class defined, we can start writing methods.\nThis will demonstrate how bdk native module will be called and how values will be returned to JS over the native bridge")]),t._v(" "),e("p",[t._v("Lets create a method that can be called from JaveScript, to do so we use the "),e("code",[t._v("@ReactMethod")]),t._v(" directive which is part of the React Context API. This will expose the method so that it can be called from JavaScript.")]),t._v(" "),e("div",{staticClass:"language-kotlin extra-class"},[e("pre",{pre:!0,attrs:{class:"language-kotlin"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// File: BdkRnModule.kt")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token annotation builtin"}},[t._v("@ReactMethod")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fun")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("createWallet")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("result"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Promise"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n \n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("p",[t._v("We need one more file to complete our native framework. A new Kotlin file, "),e("code",[t._v("BdkRnPackage.kt")]),t._v(" is required to package all our native code into a new android module, here we specify the name of the file we just crated as the module name("),e("code",[t._v("BdkRnModule")]),t._v("). This can be done by adding the following code:")]),t._v(" "),e("div",{staticClass:"language-kotlin extra-class"},[e("pre",{pre:!0,attrs:{class:"language-kotlin"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// File: BdkRnPackage.kt")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" com"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("facebook"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("react"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("ReactPackage\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" com"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("facebook"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("react"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("bridge"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("NativeModule\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" com"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("facebook"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("react"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("bridge"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("ReactApplicationContext\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" com"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("facebook"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("react"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("uimanager"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("ViewManager\n\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" BdkRnPackage "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" ReactPackage "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n\n "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("override")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fun")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("createNativeModules")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("reactContext"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" ReactApplicationContext"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v("\n MutableList"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),t._v("NativeModule"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(">")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("return")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("mutableListOf")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("BdkRnModule")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("reactContext"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n")])])]),e("p",[t._v("Now lets add code for creating a wallet in BdkRnModule.kt")]),t._v(" "),e("p",[t._v("The methods used here are for bdk-kotlin and available in the bdk-kotlin documentation.")]),t._v(" "),e("p",[t._v("We first create a key info object")]),t._v(" "),e("div",{staticClass:"language-kotlin extra-class"},[e("pre",{pre:!0,attrs:{class:"language-kotlin"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// File: BdkRnModule.kt")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token annotation builtin"}},[t._v("@ReactMethod")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fun")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("createWallet")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("result"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Promise"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Create key info with a new mnemonic")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" keys"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" ExtendedKeyInfo "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("generateExtendedKey")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n Network"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("TESTNET"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n WordCount"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("WORDS12"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string-literal singleline"}},[e("span",{pre:!0,attrs:{class:"token string"}},[t._v('""')])]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n \n "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// more code to follow...")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// create descriptor and change descriptor")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// create databaseConfig and blockchainconfig")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// create wallet")]),t._v("\n \n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("p",[t._v("Then key info used to create a wallet descriptor and change descriptor:")]),t._v(" "),e("div",{staticClass:"language-kotlin extra-class"},[e("pre",{pre:!0,attrs:{class:"language-kotlin"}},[e("code",[e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" descriptor"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" String "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string-literal singleline"}},[e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"wpkh("')])]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("+")]),t._v(" keys"),e("span",{pre:!0,attrs:{class:"token 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We intend to use bitcoin testnet and want to use default memory for data. For bitcoin node we will use a public electrum server. We will need to define these parameters to create a wallet.")]),t._v(" "),e("div",{staticClass:"language-kotlin extra-class"},[e("pre",{pre:!0,attrs:{class:"language-kotlin"}},[e("code",[e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" network "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" `Network"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("TESTNET`\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" databaseConfig "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" DatabaseConfig"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("Memory\nblockchainConfig "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("\n BlockchainConfig"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("Electrum")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("ElectrumConfig")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token string-literal singleline"}},[e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"ssl://electrum.blockstream.info:60002"')])]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("null")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" 5u"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("null")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" 10u"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),e("p",[t._v("Once done we can use these parameters to create a BDK wallet using the native android BDK library:")]),t._v(" "),e("div",{staticClass:"language-kotlin extra-class"},[e("pre",{pre:!0,attrs:{class:"language-kotlin"}},[e("code",[e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("var")]),t._v(" wallet"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" BdkWallet "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("BdkWallet")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n descriptor"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n changeDescriptor"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("setNetwork")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("network"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n databaseConfig"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n config\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),e("p",[t._v("Once we have a wallet initialised, we can call methods on it to sync, generate a new address and to get balance")]),t._v(" "),e("div",{staticClass:"language-kotlin extra-class"},[e("pre",{pre:!0,attrs:{class:"language-kotlin"}},[e("code",[t._v("wallet"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("ProgressLog"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" maxAddress"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\nwallet"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("getNewAddress")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\nwallet"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("getBalance")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("toLong")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),e("p",[t._v("To return a value from the native android code to React Native’s Javascript side over the JS Native bridge we will use "),e("code",[t._v("com.facebook.react.bridge.Promise")]),t._v(". To return balance information to JS, the following code can be used")]),t._v(" "),e("div",{staticClass:"language-kotlin extra-class"},[e("pre",{pre:!0,attrs:{class:"language-kotlin"}},[e("code",[e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" balance"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" String "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" wallet"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("getBalance")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("toLong")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\nresult"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("resolve")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("balance"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),e("p",[t._v("At this point we have an Android native module and it can be invoked from JS by calling "),e("code",[t._v("createWallet")]),t._v(" and it will return the balance.")]),t._v(" "),e("p",[t._v("This project can be imported into any RN project to reuse the defined "),e("code",[t._v("createWallet")]),t._v(" method without the need to carry out the setup described above.")]),t._v(" "),e("div",{staticClass:"language-javascript extra-class"},[e("pre",{pre:!0,attrs:{class:"language-javascript"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// any js file in React Native")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" BdkRn "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("from")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("'bdk-rn'")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// create a wallet and retrieve current balance")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("const")]),t._v(" balance "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("await")]),t._v(" BdkRn"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("createWallet")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\nconsole"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("log")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v(" balance "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\n")])])]),e("p",[t._v("The actual "),e("code",[t._v("bdk-rn")]),t._v(" module has organised the native code into granular methods for different stages of creating a wallet and for different interactions and use cases for a bitcoin application, like generating, mnemonic, keys, creating wallet for different networks, creating descriptors, creating or restoring wallet, fetching balance, fetching transactions and many other methods. Please refer to the "),e("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn#usage",target:"_blank",rel:"noopener noreferrer"}},[t._v("user guide in the readme"),e("OutboundLink")],1),t._v(" on Github for the complete API. The set of APIs available will grow in the near future as more APIs are added. This article can also be used as a guide to add new methods to the existing bdk-rn project.")]),t._v(" "),e("p",[t._v("The objective of "),e("code",[t._v("bdk-rn")]),t._v(" is to enable React Native developers to quickly start developing applications without the need to package BDK as described above.")]),t._v(" "),e("p",[t._v("Be on the lookout for user guides and tutorials on how to build bitcoin applications using "),e("code",[t._v("bdk-rn")]),t._v(" and "),e("code",[t._v("bdk-flutter")]),t._v(".")]),t._v(" "),e("h2",{attrs:{id:"references"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#references"}},[t._v("#")]),t._v(" References")]),t._v(" "),e("p",[t._v("Creating native modules for Android and iOS: "),e("a",{attrs:{href:"https://reactnative.dev/docs/native-modules-intro",target:"_blank",rel:"noopener noreferrer"}},[t._v("https://reactnative.dev/docs/native-modules-intro"),e("OutboundLink")],1)]),t._v(" "),e("p",[t._v("React Native Architecture: "),e("a",{attrs:{href:"https://www.reactnative.guide/3-react-native-internals/3.1-react-native-internals.html",target:"_blank",rel:"noopener noreferrer"}},[t._v("https://www.reactnative.guide/3-react-native-internals/3.1-react-native-internals.html"),e("OutboundLink")],1)]),t._v(" "),e("p",[t._v("BDK-Android API: "),e("a",{attrs:{href:"https://bitcoindevkit.org/bdk-jvm/bdk-jvm/org.bitcoindevkit/index.html",target:"_blank",rel:"noopener noreferrer"}},[t._v("https://bitcoindevkit.org/bdk-jvm/bdk-jvm/org.bitcoindevkit/index.html"),e("OutboundLink")],1)]),t._v(" "),e("p",[t._v("BDK-RN: "),e("a",{attrs:{href:"https://github.com/LtbLightning/bdk-rn",target:"_blank",rel:"noopener noreferrer"}},[t._v("https://github.com/LtbLightning/bdk-rn"),e("OutboundLink")],1)]),t._v(" "),e("h2",{attrs:{id:"feedback"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#feedback"}},[t._v("#")]),t._v(" Feedback")]),t._v(" "),e("p",[t._v("The best way to give feedback on this would be to comment on the "),e("a",{attrs:{href:"https://github.com/bitcoindevkit/bitcoindevkit.org/pull/107",target:"_blank",rel:"noopener noreferrer"}},[t._v("pull request"),e("OutboundLink")],1),t._v(" for this blog post.\nThanks in advance.")])])}),[],!1,null,null,null);e.default=s.exports}}]); \ No newline at end of file diff --git a/assets/js/34.2e8ace62.js b/assets/js/34.1951be7d.js similarity index 99% rename from assets/js/34.2e8ace62.js rename to assets/js/34.1951be7d.js index 641e4dfc68..47f2cd89d8 100644 --- a/assets/js/34.2e8ace62.js +++ b/assets/js/34.1951be7d.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[34],{342:function(t,e,a){t.exports=a.p+"assets/img/descriptor-tracker.5942c853.jpg"},343:function(t,e,a){t.exports=a.p+"assets/img/checkpoints.a4179787.jpg"},387:function(t,e,a){"use strict";a.r(e);var s=a(7),n=Object(s.a)({},(function(){var t=this,e=t._self._c;return e("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[e("p",[t._v("The Bitcoin Devkit (BDK) lets you do a lot of useful things through convenient high level\nabstractions. It works great when these abstractions map nicely onto what you are trying to do. My\ngoal is to develop a new "),e("code",[t._v("bdk_core")]),t._v(" library for when they don't. I want "),e("code",[t._v("bdk_core")]),t._v(" to expose all the\nuseful "),e("em",[t._v("mechanisms")]),t._v(" that BDK has inside it without them being tied to any particular usage "),e("em",[t._v("policy")]),t._v("\nand with very minimal dependencies.")]),t._v(" "),e("p",[t._v("The "),e("code",[t._v("bdk_core")]),t._v(' idea is still "in the lab". We\'re not sure yet whether '),e("code",[t._v("bdk_core")]),t._v(" will just be what's\nleft of "),e("code",[t._v("bdk")]),t._v(" once we spin off all the components that have extra dependencies into their own crates\nand refine it a bit. In that case "),e("code",[t._v("bdk_core")]),t._v(" will just be called "),e("code",[t._v("bdk v1.0.0")]),t._v(" or something. Or it might\nbe that "),e("code",[t._v("bdk")]),t._v(" lives on with its current APIs and uses stuff "),e("code",[t._v("bdk_core")]),t._v(" to implement it internally.")]),t._v(" "),e("h2",{attrs:{id:"the-separation-of-policy-and-mechanism"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#the-separation-of-policy-and-mechanism"}},[t._v("#")]),t._v(" The separation of policy and mechanism")]),t._v(" "),e("p",[t._v("My guiding principle for "),e("code",[t._v("bdk_core")]),t._v(" is the "),e("em",[t._v("separation of policy and mechanism")]),t._v(". This is\nwhat I mean by these terms:")]),t._v(" "),e("ul",[e("li",[e("em",[t._v("mechanism")]),t._v(": How you do a particular thing. Mechanism code is functional and doesn't change much.")]),t._v(" "),e("li",[e("em",[t._v("policy")]),t._v(": What you want to do. Policy code composes mechanisms to achieve something in\nan application.")])]),t._v(" "),e("p",[t._v("Here's a nice passage about why the designers of the "),e("a",{attrs:{href:"https://en.wikipedia.org/wiki/X_Window_System",target:"_blank",rel:"noopener noreferrer"}},[t._v("X window system"),e("OutboundLink")],1),t._v(" applied this principle. X has\nbeen around since 1984 and doesn't look like it's going anywhere so it probably has a lot to teach us.\nFrom "),e("em",[e("a",{attrs:{href:"https://en.wikipedia.org/wiki/The_Art_of_Unix_Programming",target:"_blank",rel:"noopener noreferrer"}},[t._v("The Art of UNIX Programming"),e("OutboundLink")],1)]),t._v(":")]),t._v(" "),e("blockquote",[e("p",[t._v("...we observed that the designers of X made a basic decision to implement “mechanism, not policy”—to\nmake X a generic graphics engine and leave decisions about user-interface style to toolkits and\nother levels of the system. We justified this by pointing out that policy and mechanism tend to\nmutate on different timescales, with policy changing much faster than mechanism. Fashions in the\nlook and feel of GUI toolkits may come and go, but raster operations and compositing are forever.")])]),t._v(" "),e("blockquote",[e("p",[t._v("Thus, hardwiring policy and mechanism together has two bad effects: It makes policy rigid and\nharder to change in response to user requirements, and it means that trying to change policy has a\nstrong tendency to destabilize the mechanisms.")])]),t._v(" "),e("blockquote",[e("p",[t._v("On the other hand, by separating the two we make it\npossible to experiment with new policy without breaking mechanisms. We also make it much easier to\nwrite good tests for the mechanism (policy, because it ages so quickly, often does not justify the\ninvestment).")])]),t._v(" "),e("ul",[e("li",[t._v("[ ] > This design rule has wide application outside the GUI context. In general, it implies that we")])]),t._v(" "),e("blockquote",[e("p",[t._v("should look for ways to separate interfaces from engines.")])]),t._v(" "),e("p",[t._v("You'll notice we have a similar situation in Bitcoin engineering. We have mechanism code like\nsigning algorithms, key derivation, transaction construction logic, etc., that don't change much. But\nhow these compose together in applications changes quickly over time and between applications.")]),t._v(" "),e("p",[t._v("The main culprit of policy and mechanism conflation in "),e("code",[t._v("bdk")]),t._v(" is the main "),e("a",{attrs:{href:"https://docs.rs/bdk/latest/bdk/wallet/struct.Wallet.html",target:"_blank",rel:"noopener noreferrer"}},[e("code",[t._v("Wallet")]),e("OutboundLink")],1),t._v(" type.\nWallets do all of the following:")]),t._v(" "),e("ol",[e("li",[t._v("Store one or two descriptors (external and optional internal).")]),t._v(" "),e("li",[t._v("Keep track of which addresses you've given out so you only give out fresh ones from each descriptor.")]),t._v(" "),e("li",[t._v("Keep a list of transactions associated with the addresses in the wallet.")]),t._v(" "),e("li",[t._v("Given a source of blockchain data it can update its internal list of transactions.")]),t._v(" "),e("li",[t._v("Given some parameters it can build a PSBT from transaction outputs.")]),t._v(" "),e("li",[t._v("Given a PSBT it can sign it with its "),e("a",{attrs:{href:"https://docs.rs/bdk/latest/bdk/wallet/signer/index.html",target:"_blank",rel:"noopener noreferrer"}},[e("code",[t._v("Signers")]),e("OutboundLink")],1),t._v(".")])]),t._v(" "),e("p",[t._v("All of that is very useful but it is bound together with the particular policies and opinions of "),e("code",[t._v("Wallet")]),t._v(".\nIf "),e("code",[t._v("Wallet")]),t._v("'s policy is not your policy it's going to be tricky to get it to do what you want.\nHere are some examples:")]),t._v(" "),e("ol",[e("li",[t._v("In order to control how the "),e("code",[t._v("Wallet")]),t._v(" will select coins for a transaction internally you have to\npass in something implementing the "),e("a",{attrs:{href:"https://docs.rs/bdk/latest/bdk/wallet/coin_selection/trait.CoinSelectionAlgorithm.html",target:"_blank",rel:"noopener noreferrer"}},[e("code",[t._v("CoinSelectionAlgorithm")]),e("OutboundLink")],1),t._v(" trait. A coin selection algorithm\nis clearly mechanism code but the policy of "),e("code",[t._v("Wallet")]),t._v(" restricts that mechanism's interface. We\nhave "),e("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/issues/281",target:"_blank",rel:"noopener noreferrer"}},[t._v("very old issues"),e("OutboundLink")],1),t._v(" related to what the\ninterface of this trait should be and we don't have a clear way forward. In "),e("code",[t._v("bdk_core")]),t._v(" I want to\npurely provide the coin selection mechanisms for figuring out whether you need to select more\nUTXOs or whether you need a change output etc. How you use that mechanism will be up to you.")]),t._v(" "),e("li",[t._v("Another trait that has a similar structure is the "),e("a",{attrs:{href:"https://docs.rs/bdk/latest/bdk/wallet/signer/index.html",target:"_blank",rel:"noopener noreferrer"}},[e("code",[t._v("Signer")]),e("OutboundLink")],1),t._v(" trait. You have to pass in signers\nso your wallet can sign PSBTs but you have little control over how the wallet chooses which\nsigners to use in any given situation. Right now the wallet will just iterate through all the\nsigners and ask them to sign. This is not always appropriate. In "),e("code",[t._v("bdk_core")]),t._v(" I want to provide\nfunctions for populating PSBTs given something that can sign. You'll be in control of when they\nget called.")])]),t._v(" "),e("h2",{attrs:{id:"a-syncing-mechansim-without-the-policy"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#a-syncing-mechansim-without-the-policy"}},[t._v("#")]),t._v(" A syncing mechansim without the policy")]),t._v(" "),e("p",[t._v("Syncing in "),e("code",[t._v("bdk")]),t._v(" is the place where the design of "),e("code",[t._v("Wallet")]),t._v(" is most restrictive. The "),e("a",{attrs:{href:"https://docs.rs/bdk/latest/bdk/blockchain/trait.WalletSync.html",target:"_blank",rel:"noopener noreferrer"}},[e("code",[t._v("WalletSync")]),e("OutboundLink")],1),t._v("\ntrait forces you to sync all addresses in a wallet in one big batch. But this is not always what you\nwant to do. I spoke to a developer who wanted to sync his wallet slowly over time with each address\nbeing queried over a different Tor connection. It would be really difficult to implement\n"),e("code",[t._v("WalletSync")]),t._v(" with such a strategy. Another example where "),e("code",[t._v("WalletSync")]),t._v(" isn't the right fit is the\n"),e("a",{attrs:{href:"https://l2.technology/sensei",target:"_blank",rel:"noopener noreferrer"}},[t._v("Sensei"),e("OutboundLink")],1),t._v(" project which uses BDK but incrementally updates the database whenever new information\ncomes in from the blockchain.")]),t._v(" "),e("p",[t._v("Even if syncing all addresses at the same time is roughly what you want to do "),e("code",[t._v("WalletSync")]),t._v(" still\ngets in the way since it defines whether you do it synchronously or asynchrononusly. Applications\ncan control this through "),e("code",[t._v("bdk")]),t._v("'s "),e("code",[t._v("async-interface")]),t._v(" feature flag which internally changes the trait\ndefinition through macros. Another annoyance is that when using "),e("code",[t._v("async-interface")]),t._v(" the future that\ngets returned from "),e("code",[t._v("WalletSync")]),t._v(" "),e("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/issues/165",target:"_blank",rel:"noopener noreferrer"}},[t._v("cannot be "),e("code",[t._v("Send")]),e("OutboundLink")],1),t._v("\nbecause of how "),e("code",[t._v("Wallet")]),t._v(" handles database mutability internally, meaning you can't spawn the future\ninto a new thread.")]),t._v(" "),e("h3",{attrs:{id:"a-general-syncing-mechanism"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#a-general-syncing-mechanism"}},[t._v("#")]),t._v(" A general syncing mechanism")]),t._v(" "),e("p",[t._v("So what is the most general syncing mechanism that solves these problems? These are the things I\nthink it has to do regardless of where the blockchain data comes from or how it's stored:")]),t._v(" "),e("ol",[e("li",[t._v("Generate and store addresses.")]),t._v(" "),e("li",[t._v("Index transaction data, e.g. transaction outputs we own, when/if they were spent, etc.")]),t._v(" "),e("li",[t._v("Keep track of which addresses have been given out and which have been used.")]),t._v(" "),e("li",[t._v('Be able to "roll back" our view of the above data if a reorg makes some of it stale.')]),t._v(" "),e("li",[t._v("Keep track of transactions related our addresses in our mempool.")])]),t._v(" "),e("p",[t._v("Let's talk about how to implement a mechanism that does all that.")]),t._v(" "),e("h3",{attrs:{id:"how-to-store-and-index-transactions"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#how-to-store-and-index-transactions"}},[t._v("#")]),t._v(" How to store and index transactions")]),t._v(" "),e("p",[t._v("Different persistent storage backends have different APIs and their own indexing strategies. That's\nwhy the "),e("a",{attrs:{href:"https://docs.rs/bdk/latest/bdk/database/trait.Database.html",target:"_blank",rel:"noopener noreferrer"}},[e("code",[t._v("Database")]),e("OutboundLink")],1),t._v(" trait exists in BDK, to make a clean API to the different storage engines. It's\nimportant to note that the database in BDK only holds public data that could always be retrieved\nfrom the chain. It's just a cache. Despite this we support different backends. Right now it is a\nlot of work to add a new index to the data since you have to add it to every backend and you might have\nto apply schema changes (we still "),e("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/issues/359",target:"_blank",rel:"noopener noreferrer"}},[t._v("don't have a standard approach to\nthis"),e("OutboundLink")],1),t._v(").")]),t._v(" "),e("p",[t._v("Thomas Eizinger "),e("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/issues/165#issuecomment-1047483895",target:"_blank",rel:"noopener noreferrer"}},[t._v("suggested"),e("OutboundLink")],1),t._v("\ndoing everything in memory and only writing to persistent storage when it was convenient. It took me\nsome time but I came around to this idea. It would allow us to get rid of the "),e("code",[t._v("Database")]),t._v(" trait (at\nleast at the "),e("code",[t._v("bdk_core")]),t._v(" level) and greatly simplify what the persistent storage layer has to do.\nWhenever the data is loaded from persistent storage we can just do the indexing in memory and\npresent it to the application.")]),t._v(" "),e("p",[e("em",[t._v("But wait! Wouldn't this mean we'd use way more memory than we need to?")]),t._v(" Yes but memory is cheap.\nConsider that if we say the average transaction size is 300 bytes then with all our indexes each\ntransaction might cost 1kb of memory (pessimistically). This means we could index one thousand\ntransactions in a single megabyte! My iPhone has 4gb of memory so it could index a million\ntransactions with plenty of memory to spare. "),e("em",[t._v("But what if some users can't afford an iPhone?")]),t._v(" Then\nthey also couldn't have afforded to have made a million Bitcoin transactions! "),e("em",[t._v("But what about memory\nconstrained devices like hardware wallets!?")]),t._v(" Those devices typically don't store and retrieve\ntransactions. They're usually just signing devices. Perhaps one day someone will build a memory\nconstrained device that needs to do this work but until then I think this is a fine approach to\ntake.")]),t._v(" "),e("p",[t._v("For now I'm calling this thing that does the in-memory indexing of transactions related to a single\ndescriptor a "),e("code",[t._v("DescriptorTracker")]),t._v(". Here's a diagram that communicates how I imagine it relates to the\nother components.")]),t._v(" "),e("figure",[e("img",{attrs:{src:a(342),alt:""}})]),t._v(" "),e("h3",{attrs:{id:"rolling-back-rolling-forward-and-syncing-to-disk"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#rolling-back-rolling-forward-and-syncing-to-disk"}},[t._v("#")]),t._v(" Rolling back, rolling forward and syncing to disk")]),t._v(" "),e("p",[t._v("State changes in blockchains are clearly delineated. They all happen in blocks! Every view of the\nblockchain, whether you're getting it through compact block filters, an electrum server or something\nwacky like a utreexo bridge will have a concept of blocks and transactions in them. For a wallet we\nonly need a very sparse view of the blockchain that includes at which block a set of transactions\nexisted. That way, if a block disappears we know that all those transactions might disappear too.")]),t._v(" "),e("p",[t._v("With "),e("code",[t._v("bdk_core")]),t._v(" I want to introduce the concept of a "),e("em",[t._v("checkpoint")]),t._v(", which is a block height and hash and\na set of txids that were present at that height "),e("strong",[t._v("but not present in the previous checkpoint")]),t._v(". In\nthis way we create an append-only data structure that can easily be rolled back to a previous height\nif there is a reorg. After rolling back we can then roll forward and apply the new blocks.")]),t._v(" "),e("p",[t._v("Here's an example of how this idea works:")]),t._v(" "),e("figure",[e("img",{attrs:{src:a(343),alt:""}})]),t._v(" "),e("p",[t._v("There are a few edge cases I'd like to cover:")]),t._v(" "),e("ol",[e("li",[t._v("What if when gathering new data from the chain to update a "),e("code",[t._v("DescriptorTracker")]),t._v(" we find an old transaction that belongs to an earlier checkpoint that we had missed form our earlier syncs?")]),t._v(" "),e("li",[t._v("What if when we go to write to persistent storage from a "),e("code",[t._v("DescriptorTracker")]),t._v(" we find that it has some transactions the tracker doesn't? Should we try and reconcile the two sets of transactions?")])]),t._v(" "),e("p",[t._v("I think the correct approach is to treat the chain data as the source of truth for the\n"),e("code",[t._v("DescriptorTracker")]),t._v(" and the "),e("code",[t._v("DescriptorTracker")]),t._v(" as the source of truth for persistent storage. That\nis in the case of (1) we should just rollback the "),e("code",[t._v("DescriptorTracker")]),t._v(" and insert the old but\nrecently discovered transaction in the right place. In the case of (2) we should roll back the\npersistent storage to the point where it differs and apply changes from there. This implies that you\nshould only keep one instance of a "),e("code",[t._v("DescriptorTracker")]),t._v(" for a descriptor in your application and only\nupdate persistent storage by first applying the changes to the tracker.")]),t._v(" "),e("h2",{attrs:{id:"examples"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#examples"}},[t._v("#")]),t._v(" Examples")]),t._v(" "),e("p",[t._v("Here are some examples of what I think this may end up looking like in code. Keep in mind that if\nthis looks complicated it will probably be more complicated in practice! This doesn't mean that we\ncan't create simplifying abstractions and tools around these primitives to cover common policies. I hope we can implement "),e("code",[t._v("Wallet")]),t._v(" with "),e("code",[t._v("DescriptorTracker")]),t._v("s internally.")]),t._v(" "),e("h3",{attrs:{id:"doing-an-initial-sync-of-a-descriptor-that-may-already-contain-coins"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#doing-an-initial-sync-of-a-descriptor-that-may-already-contain-coins"}},[t._v("#")]),t._v(" Doing an initial sync of a descriptor that may already contain coins")]),t._v(" "),e("p",[t._v("When we first sync a descriptor that may already contain coins we want to iterate over all the\nscripts of the wallet and then stop if there's a big enough gap (e.g. 20). In this example we use an\nstateless "),e("a",{attrs:{href:"https://mempool.space/docs/api/rest",target:"_blank",rel:"noopener noreferrer"}},[t._v("esplora-like API"),e("OutboundLink")],1),t._v(".")]),t._v(" "),e("div",{staticClass:"language-rust extra-class"},[e("pre",{pre:!0,attrs:{class:"language-rust"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// create a descriptor tracker the external addresses of a BIP86 key")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("mut")]),t._v(" tracker "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("DescriptorTracker")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("new")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("\"tr([73c5da0a/86'/0'/0']xpub6BgBgsespWvERF3LHQu6CnqdvfEvtMcQjYrcRzx53QJjSxarj2afYWcLteoGVky7D3UKDP9QyrLprQ3VCECoY49yfdDEHGCtMMj92pReUsQ/0/*)\"")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" esplora "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("bdk_esplora"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Client")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("new")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" update "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" esplora"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("fetch_related_transactions")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("bdk_esplora"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Params")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// iterate over all addresses in a descriptor")]),t._v("\n scripts"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token 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punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("apply_update")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("update"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// now we want to persist this disk")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" db_update "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" tracker"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("generate_update")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Params")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n start_checkpoint"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Note that the db_update type is the same as the `update` above.")]),t._v("\nmy_db"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("apply_update")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("db_update"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),e("h3",{attrs:{id:"doing-a-sync-of-a-wallet-after-you-already-have-syncd"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#doing-a-sync-of-a-wallet-after-you-already-have-syncd"}},[t._v("#")]),t._v(" Doing a sync of a wallet after you already have sync'd")]),t._v(" "),e("p",[t._v("Now imagine you just want to check if any UTXOs in your wallet have been spent. In this case we've\nalready sync'd before so we need to load that data into the tracker from disk first (rather than\ngoing straight to the blockchain). Then we just ask esplora for transactions related to these\ntransaction outputs.")]),t._v(" "),e("div",{staticClass:"language-rust extra-class"},[e("pre",{pre:!0,attrs:{class:"language-rust"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// create a descriptor tracker the external addresses of a BIP86 key")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("mut")]),t._v(" tracker "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("DescriptorTracker")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("new")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token 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"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("h3",{attrs:{id:"updating-state-when-you-get-the-data-in-real-time"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#updating-state-when-you-get-the-data-in-real-time"}},[t._v("#")]),t._v(" Updating state when you get the data in real time")]),t._v(" "),e("p",[t._v("If you have an event based view of the blockchain that feeds you block connected or block\ndisconnected events then I imagine the API would look something like this.\nThere's quite a bit left out here but I hope you get the idea.")]),t._v(" "),e("div",{staticClass:"language-rust extra-class"},[e("pre",{pre:!0,attrs:{class:"language-rust"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// create a descriptor tracker the external addresses of a BIP86 key")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" 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punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("apply_block")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("new_block"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=>")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Ok")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("modified"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=>")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("if")]),t._v(" modified "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// update persistent storage from tracker")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Err")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("ApplyBlockError")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("OutOfOrder")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=>")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// the block event we got was not the next block we expected.")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// How to recover from this will depend on the application and block source")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token 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this might invalidate a checkpoint")]),t._v("\n tracker"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("disconnect_block")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("disconnected_height"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" disconnected_hash"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Now apply to persistent storage")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token 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do a lot of useful things through convenient high level\nabstractions. It works great when these abstractions map nicely onto what you are trying to do. My\ngoal is to develop a new "),e("code",[t._v("bdk_core")]),t._v(" library for when they don't. I want "),e("code",[t._v("bdk_core")]),t._v(" to expose all the\nuseful "),e("em",[t._v("mechanisms")]),t._v(" that BDK has inside it without them being tied to any particular usage "),e("em",[t._v("policy")]),t._v("\nand with very minimal dependencies.")]),t._v(" "),e("p",[t._v("The "),e("code",[t._v("bdk_core")]),t._v(' idea is still "in the lab". We\'re not sure yet whether '),e("code",[t._v("bdk_core")]),t._v(" will just be what's\nleft of "),e("code",[t._v("bdk")]),t._v(" once we spin off all the components that have extra dependencies into their own crates\nand refine it a bit. In that case "),e("code",[t._v("bdk_core")]),t._v(" will just be called "),e("code",[t._v("bdk v1.0.0")]),t._v(" or something. Or it might\nbe that "),e("code",[t._v("bdk")]),t._v(" lives on with its current APIs and uses stuff "),e("code",[t._v("bdk_core")]),t._v(" to implement it internally.")]),t._v(" "),e("h2",{attrs:{id:"the-separation-of-policy-and-mechanism"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#the-separation-of-policy-and-mechanism"}},[t._v("#")]),t._v(" The separation of policy and mechanism")]),t._v(" "),e("p",[t._v("My guiding principle for "),e("code",[t._v("bdk_core")]),t._v(" is the "),e("em",[t._v("separation of policy and mechanism")]),t._v(". This is\nwhat I mean by these terms:")]),t._v(" "),e("ul",[e("li",[e("em",[t._v("mechanism")]),t._v(": How you do a particular thing. Mechanism code is functional and doesn't change much.")]),t._v(" "),e("li",[e("em",[t._v("policy")]),t._v(": What you want to do. Policy code composes mechanisms to achieve something in\nan application.")])]),t._v(" "),e("p",[t._v("Here's a nice passage about why the designers of the "),e("a",{attrs:{href:"https://en.wikipedia.org/wiki/X_Window_System",target:"_blank",rel:"noopener noreferrer"}},[t._v("X window system"),e("OutboundLink")],1),t._v(" applied this principle. X has\nbeen around since 1984 and doesn't look like it's going anywhere so it probably has a lot to teach us.\nFrom "),e("em",[e("a",{attrs:{href:"https://en.wikipedia.org/wiki/The_Art_of_Unix_Programming",target:"_blank",rel:"noopener noreferrer"}},[t._v("The Art of UNIX Programming"),e("OutboundLink")],1)]),t._v(":")]),t._v(" "),e("blockquote",[e("p",[t._v("...we observed that the designers of X made a basic decision to implement “mechanism, not policy”—to\nmake X a generic graphics engine and leave decisions about user-interface style to toolkits and\nother levels of the system. We justified this by pointing out that policy and mechanism tend to\nmutate on different timescales, with policy changing much faster than mechanism. Fashions in the\nlook and feel of GUI toolkits may come and go, but raster operations and compositing are forever.")])]),t._v(" "),e("blockquote",[e("p",[t._v("Thus, hardwiring policy and mechanism together has two bad effects: It makes policy rigid and\nharder to change in response to user requirements, and it means that trying to change policy has a\nstrong tendency to destabilize the mechanisms.")])]),t._v(" "),e("blockquote",[e("p",[t._v("On the other hand, by separating the two we make it\npossible to experiment with new policy without breaking mechanisms. We also make it much easier to\nwrite good tests for the mechanism (policy, because it ages so quickly, often does not justify the\ninvestment).")])]),t._v(" "),e("ul",[e("li",[t._v("[ ] > This design rule has wide application outside the GUI context. In general, it implies that we")])]),t._v(" "),e("blockquote",[e("p",[t._v("should look for ways to separate interfaces from engines.")])]),t._v(" "),e("p",[t._v("You'll notice we have a similar situation in Bitcoin engineering. We have mechanism code like\nsigning algorithms, key derivation, transaction construction logic, etc., that don't change much. But\nhow these compose together in applications changes quickly over time and between applications.")]),t._v(" "),e("p",[t._v("The main culprit of policy and mechanism conflation in "),e("code",[t._v("bdk")]),t._v(" is the main "),e("a",{attrs:{href:"https://docs.rs/bdk/latest/bdk/wallet/struct.Wallet.html",target:"_blank",rel:"noopener noreferrer"}},[e("code",[t._v("Wallet")]),e("OutboundLink")],1),t._v(" type.\nWallets do all of the following:")]),t._v(" "),e("ol",[e("li",[t._v("Store one or two descriptors (external and optional internal).")]),t._v(" "),e("li",[t._v("Keep track of which addresses you've given out so you only give out fresh ones from each descriptor.")]),t._v(" "),e("li",[t._v("Keep a list of transactions associated with the addresses in the wallet.")]),t._v(" "),e("li",[t._v("Given a source of blockchain data it can update its internal list of transactions.")]),t._v(" "),e("li",[t._v("Given some parameters it can build a PSBT from transaction outputs.")]),t._v(" "),e("li",[t._v("Given a PSBT it can sign it with its "),e("a",{attrs:{href:"https://docs.rs/bdk/latest/bdk/wallet/signer/index.html",target:"_blank",rel:"noopener noreferrer"}},[e("code",[t._v("Signers")]),e("OutboundLink")],1),t._v(".")])]),t._v(" "),e("p",[t._v("All of that is very useful but it is bound together with the particular policies and opinions of "),e("code",[t._v("Wallet")]),t._v(".\nIf "),e("code",[t._v("Wallet")]),t._v("'s policy is not your policy it's going to be tricky to get it to do what you want.\nHere are some examples:")]),t._v(" "),e("ol",[e("li",[t._v("In order to control how the "),e("code",[t._v("Wallet")]),t._v(" will select coins for a transaction internally you have to\npass in something implementing the "),e("a",{attrs:{href:"https://docs.rs/bdk/latest/bdk/wallet/coin_selection/trait.CoinSelectionAlgorithm.html",target:"_blank",rel:"noopener noreferrer"}},[e("code",[t._v("CoinSelectionAlgorithm")]),e("OutboundLink")],1),t._v(" trait. A coin selection algorithm\nis clearly mechanism code but the policy of "),e("code",[t._v("Wallet")]),t._v(" restricts that mechanism's interface. We\nhave "),e("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/issues/281",target:"_blank",rel:"noopener noreferrer"}},[t._v("very old issues"),e("OutboundLink")],1),t._v(" related to what the\ninterface of this trait should be and we don't have a clear way forward. In "),e("code",[t._v("bdk_core")]),t._v(" I want to\npurely provide the coin selection mechanisms for figuring out whether you need to select more\nUTXOs or whether you need a change output etc. How you use that mechanism will be up to you.")]),t._v(" "),e("li",[t._v("Another trait that has a similar structure is the "),e("a",{attrs:{href:"https://docs.rs/bdk/latest/bdk/wallet/signer/index.html",target:"_blank",rel:"noopener noreferrer"}},[e("code",[t._v("Signer")]),e("OutboundLink")],1),t._v(" trait. You have to pass in signers\nso your wallet can sign PSBTs but you have little control over how the wallet chooses which\nsigners to use in any given situation. Right now the wallet will just iterate through all the\nsigners and ask them to sign. This is not always appropriate. In "),e("code",[t._v("bdk_core")]),t._v(" I want to provide\nfunctions for populating PSBTs given something that can sign. You'll be in control of when they\nget called.")])]),t._v(" "),e("h2",{attrs:{id:"a-syncing-mechansim-without-the-policy"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#a-syncing-mechansim-without-the-policy"}},[t._v("#")]),t._v(" A syncing mechansim without the policy")]),t._v(" "),e("p",[t._v("Syncing in "),e("code",[t._v("bdk")]),t._v(" is the place where the design of "),e("code",[t._v("Wallet")]),t._v(" is most restrictive. The "),e("a",{attrs:{href:"https://docs.rs/bdk/latest/bdk/blockchain/trait.WalletSync.html",target:"_blank",rel:"noopener noreferrer"}},[e("code",[t._v("WalletSync")]),e("OutboundLink")],1),t._v("\ntrait forces you to sync all addresses in a wallet in one big batch. But this is not always what you\nwant to do. I spoke to a developer who wanted to sync his wallet slowly over time with each address\nbeing queried over a different Tor connection. It would be really difficult to implement\n"),e("code",[t._v("WalletSync")]),t._v(" with such a strategy. Another example where "),e("code",[t._v("WalletSync")]),t._v(" isn't the right fit is the\n"),e("a",{attrs:{href:"https://l2.technology/sensei",target:"_blank",rel:"noopener noreferrer"}},[t._v("Sensei"),e("OutboundLink")],1),t._v(" project which uses BDK but incrementally updates the database whenever new information\ncomes in from the blockchain.")]),t._v(" "),e("p",[t._v("Even if syncing all addresses at the same time is roughly what you want to do "),e("code",[t._v("WalletSync")]),t._v(" still\ngets in the way since it defines whether you do it synchronously or asynchrononusly. Applications\ncan control this through "),e("code",[t._v("bdk")]),t._v("'s "),e("code",[t._v("async-interface")]),t._v(" feature flag which internally changes the trait\ndefinition through macros. Another annoyance is that when using "),e("code",[t._v("async-interface")]),t._v(" the future that\ngets returned from "),e("code",[t._v("WalletSync")]),t._v(" "),e("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/issues/165",target:"_blank",rel:"noopener noreferrer"}},[t._v("cannot be "),e("code",[t._v("Send")]),e("OutboundLink")],1),t._v("\nbecause of how "),e("code",[t._v("Wallet")]),t._v(" handles database mutability internally, meaning you can't spawn the future\ninto a new thread.")]),t._v(" "),e("h3",{attrs:{id:"a-general-syncing-mechanism"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#a-general-syncing-mechanism"}},[t._v("#")]),t._v(" A general syncing mechanism")]),t._v(" "),e("p",[t._v("So what is the most general syncing mechanism that solves these problems? These are the things I\nthink it has to do regardless of where the blockchain data comes from or how it's stored:")]),t._v(" "),e("ol",[e("li",[t._v("Generate and store addresses.")]),t._v(" "),e("li",[t._v("Index transaction data, e.g. transaction outputs we own, when/if they were spent, etc.")]),t._v(" "),e("li",[t._v("Keep track of which addresses have been given out and which have been used.")]),t._v(" "),e("li",[t._v('Be able to "roll back" our view of the above data if a reorg makes some of it stale.')]),t._v(" "),e("li",[t._v("Keep track of transactions related our addresses in our mempool.")])]),t._v(" "),e("p",[t._v("Let's talk about how to implement a mechanism that does all that.")]),t._v(" "),e("h3",{attrs:{id:"how-to-store-and-index-transactions"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#how-to-store-and-index-transactions"}},[t._v("#")]),t._v(" How to store and index transactions")]),t._v(" "),e("p",[t._v("Different persistent storage backends have different APIs and their own indexing strategies. That's\nwhy the "),e("a",{attrs:{href:"https://docs.rs/bdk/latest/bdk/database/trait.Database.html",target:"_blank",rel:"noopener noreferrer"}},[e("code",[t._v("Database")]),e("OutboundLink")],1),t._v(" trait exists in BDK, to make a clean API to the different storage engines. It's\nimportant to note that the database in BDK only holds public data that could always be retrieved\nfrom the chain. It's just a cache. Despite this we support different backends. Right now it is a\nlot of work to add a new index to the data since you have to add it to every backend and you might have\nto apply schema changes (we still "),e("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/issues/359",target:"_blank",rel:"noopener noreferrer"}},[t._v("don't have a standard approach to\nthis"),e("OutboundLink")],1),t._v(").")]),t._v(" "),e("p",[t._v("Thomas Eizinger "),e("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/issues/165#issuecomment-1047483895",target:"_blank",rel:"noopener noreferrer"}},[t._v("suggested"),e("OutboundLink")],1),t._v("\ndoing everything in memory and only writing to persistent storage when it was convenient. It took me\nsome time but I came around to this idea. It would allow us to get rid of the "),e("code",[t._v("Database")]),t._v(" trait (at\nleast at the "),e("code",[t._v("bdk_core")]),t._v(" level) and greatly simplify what the persistent storage layer has to do.\nWhenever the data is loaded from persistent storage we can just do the indexing in memory and\npresent it to the application.")]),t._v(" "),e("p",[e("em",[t._v("But wait! Wouldn't this mean we'd use way more memory than we need to?")]),t._v(" Yes but memory is cheap.\nConsider that if we say the average transaction size is 300 bytes then with all our indexes each\ntransaction might cost 1kb of memory (pessimistically). This means we could index one thousand\ntransactions in a single megabyte! My iPhone has 4gb of memory so it could index a million\ntransactions with plenty of memory to spare. "),e("em",[t._v("But what if some users can't afford an iPhone?")]),t._v(" Then\nthey also couldn't have afforded to have made a million Bitcoin transactions! "),e("em",[t._v("But what about memory\nconstrained devices like hardware wallets!?")]),t._v(" Those devices typically don't store and retrieve\ntransactions. They're usually just signing devices. Perhaps one day someone will build a memory\nconstrained device that needs to do this work but until then I think this is a fine approach to\ntake.")]),t._v(" "),e("p",[t._v("For now I'm calling this thing that does the in-memory indexing of transactions related to a single\ndescriptor a "),e("code",[t._v("DescriptorTracker")]),t._v(". Here's a diagram that communicates how I imagine it relates to the\nother components.")]),t._v(" "),e("figure",[e("img",{attrs:{src:a(342),alt:""}})]),t._v(" "),e("h3",{attrs:{id:"rolling-back-rolling-forward-and-syncing-to-disk"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#rolling-back-rolling-forward-and-syncing-to-disk"}},[t._v("#")]),t._v(" Rolling back, rolling forward and syncing to disk")]),t._v(" "),e("p",[t._v("State changes in blockchains are clearly delineated. They all happen in blocks! Every view of the\nblockchain, whether you're getting it through compact block filters, an electrum server or something\nwacky like a utreexo bridge will have a concept of blocks and transactions in them. For a wallet we\nonly need a very sparse view of the blockchain that includes at which block a set of transactions\nexisted. That way, if a block disappears we know that all those transactions might disappear too.")]),t._v(" "),e("p",[t._v("With "),e("code",[t._v("bdk_core")]),t._v(" I want to introduce the concept of a "),e("em",[t._v("checkpoint")]),t._v(", which is a block height and hash and\na set of txids that were present at that height "),e("strong",[t._v("but not present in the previous checkpoint")]),t._v(". In\nthis way we create an append-only data structure that can easily be rolled back to a previous height\nif there is a reorg. After rolling back we can then roll forward and apply the new blocks.")]),t._v(" "),e("p",[t._v("Here's an example of how this idea works:")]),t._v(" "),e("figure",[e("img",{attrs:{src:a(343),alt:""}})]),t._v(" "),e("p",[t._v("There are a few edge cases I'd like to cover:")]),t._v(" "),e("ol",[e("li",[t._v("What if when gathering new data from the chain to update a "),e("code",[t._v("DescriptorTracker")]),t._v(" we find an old transaction that belongs to an earlier checkpoint that we had missed form our earlier syncs?")]),t._v(" "),e("li",[t._v("What if when we go to write to persistent storage from a "),e("code",[t._v("DescriptorTracker")]),t._v(" we find that it has some transactions the tracker doesn't? Should we try and reconcile the two sets of transactions?")])]),t._v(" "),e("p",[t._v("I think the correct approach is to treat the chain data as the source of truth for the\n"),e("code",[t._v("DescriptorTracker")]),t._v(" and the "),e("code",[t._v("DescriptorTracker")]),t._v(" as the source of truth for persistent storage. That\nis in the case of (1) we should just rollback the "),e("code",[t._v("DescriptorTracker")]),t._v(" and insert the old but\nrecently discovered transaction in the right place. In the case of (2) we should roll back the\npersistent storage to the point where it differs and apply changes from there. This implies that you\nshould only keep one instance of a "),e("code",[t._v("DescriptorTracker")]),t._v(" for a descriptor in your application and only\nupdate persistent storage by first applying the changes to the tracker.")]),t._v(" "),e("h2",{attrs:{id:"examples"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#examples"}},[t._v("#")]),t._v(" Examples")]),t._v(" "),e("p",[t._v("Here are some examples of what I think this may end up looking like in code. Keep in mind that if\nthis looks complicated it will probably be more complicated in practice! This doesn't mean that we\ncan't create simplifying abstractions and tools around these primitives to cover common policies. I hope we can implement "),e("code",[t._v("Wallet")]),t._v(" with "),e("code",[t._v("DescriptorTracker")]),t._v("s internally.")]),t._v(" "),e("h3",{attrs:{id:"doing-an-initial-sync-of-a-descriptor-that-may-already-contain-coins"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#doing-an-initial-sync-of-a-descriptor-that-may-already-contain-coins"}},[t._v("#")]),t._v(" Doing an initial sync of a descriptor that may already contain coins")]),t._v(" "),e("p",[t._v("When we first sync a descriptor that may already contain coins we want to iterate over all the\nscripts of the wallet and then stop if there's a big enough gap (e.g. 20). In this example we use an\nstateless "),e("a",{attrs:{href:"https://mempool.space/docs/api/rest",target:"_blank",rel:"noopener noreferrer"}},[t._v("esplora-like API"),e("OutboundLink")],1),t._v(".")]),t._v(" "),e("div",{staticClass:"language-rust extra-class"},[e("pre",{pre:!0,attrs:{class:"language-rust"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// create a descriptor tracker the external addresses of a BIP86 key")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("mut")]),t._v(" tracker "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("DescriptorTracker")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("new")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("\"tr([73c5da0a/86'/0'/0']xpub6BgBgsespWvERF3LHQu6CnqdvfEvtMcQjYrcRzx53QJjSxarj2afYWcLteoGVky7D3UKDP9QyrLprQ3VCECoY49yfdDEHGCtMMj92pReUsQ/0/*)\"")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" esplora "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("bdk_esplora"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Client")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("new")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" update "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" esplora"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("fetch_related_transactions")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("bdk_esplora"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Params")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// iterate over all addresses in a descriptor")]),t._v("\n scripts"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Some")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("tracker"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("iter_scripts")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// stop if you find a gap of 20 unused addresses")]),t._v("\n stop_gap"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Some")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("20")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("..")]),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Default")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("default")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("await")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\ntracker"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("apply_update")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("update"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// now we want to persist this disk")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" db_update "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" tracker"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("generate_update")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Params")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n start_checkpoint"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Note that the db_update type is the same as the `update` above.")]),t._v("\nmy_db"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("apply_update")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("db_update"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),e("h3",{attrs:{id:"doing-a-sync-of-a-wallet-after-you-already-have-syncd"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#doing-a-sync-of-a-wallet-after-you-already-have-syncd"}},[t._v("#")]),t._v(" Doing a sync of a wallet after you already have sync'd")]),t._v(" "),e("p",[t._v("Now imagine you just want to check if any UTXOs in your wallet have been spent. In this case we've\nalready sync'd before so we need to load that data into the tracker from disk first (rather than\ngoing straight to the blockchain). Then we just ask esplora for transactions related to these\ntransaction outputs.")]),t._v(" "),e("div",{staticClass:"language-rust extra-class"},[e("pre",{pre:!0,attrs:{class:"language-rust"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// create a descriptor tracker the external addresses of a BIP86 key")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("mut")]),t._v(" tracker "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("DescriptorTracker")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("new")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token 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this might invalidate a checkpoint")]),t._v("\n tracker"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("disconnect_block")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("disconnected_height"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" disconnected_hash"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Now apply to persistent storage")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("h2",{attrs:{id:"feedback"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#feedback"}},[t._v("#")]),t._v(" Feedback")]),t._v(" "),e("p",[t._v("The best way to give feedback on this would be to comment on the "),e("a",{attrs:{href:"https://github.com/bitcoindevkit/bitcoindevkit.org/pull/100",target:"_blank",rel:"noopener noreferrer"}},[t._v("pull request"),e("OutboundLink")],1),t._v(" for this blog post.\nThanks in advance.")])])}),[],!1,null,null,null);e.default=n.exports}}]); \ No newline at end of file diff --git a/assets/js/38.1fc1fabc.js b/assets/js/38.0e255ec5.js similarity index 99% rename from assets/js/38.1fc1fabc.js rename to assets/js/38.0e255ec5.js index 9ffcda8c7e..df5bd2c68d 100644 --- a/assets/js/38.1fc1fabc.js +++ b/assets/js/38.0e255ec5.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[38],{384:function(e,t,r){"use strict";r.r(t);var n=r(7),o=Object(n.a)({},(function(){var e=this,t=e._self._c;return t("ContentSlotsDistributor",{attrs:{"slot-key":e.$parent.slotKey}},[t("h3",{attrs:{id:"this-post"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#this-post"}},[e._v("#")]),e._v(" This Post")]),e._v(" "),t("p",[e._v("The "),t("a",{attrs:{href:"https://spiral.xyz",target:"_blank",rel:"noopener noreferrer"}},[e._v("Spiral"),t("OutboundLink")],1),e._v(" team has graciously supported BDK financially (and spiritually) for the past four years and since early 2022 the BDK team has let folks know what we've been up to via the "),t("a",{attrs:{href:"https://spiral.xyz/blog/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Spiral blog"),t("OutboundLink")],1),e._v(". As of last summer we are grateful to also have received a generous "),t("a",{attrs:{href:"https://opensats.org/blog/bitcoin-and-nostr-grants-august-2023",target:"_blank",rel:"noopener noreferrer"}},[e._v("OpenSats grant"),t("OutboundLink")],1),e._v(" supporting our project. To keep our current and future financial supporters, open source contributors, and downstream users updated on our progress, starting this year we will be publishing a quarterly BDK project updates here on our blog.")]),e._v(" "),t("h3",{attrs:{id:"end-of-year-review"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#end-of-year-review"}},[e._v("#")]),e._v(" End of Year Review")]),e._v(" "),t("p",[e._v("The BDK project is made up of a core suite of "),t("a",{attrs:{href:"https://www.rust-lang.org/",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust"),t("OutboundLink")],1),e._v(" libraries ("),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk?tab=readme-ov-file#architecture",target:"_blank",rel:"noopener noreferrer"}},[e._v("bdk-*"),t("OutboundLink")],1),e._v(") that work together to provide everything an application developer needs to incorporate on-chain bitcoin wallet functionality into their project. Wrapped around the BDK core libraries is our "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk-ffi",target:"_blank",rel:"noopener noreferrer"}},[e._v("bdk-ffi"),t("OutboundLink")],1),e._v(" bindings libraries that let Kotlin (desktop/android), Swift (desktop/iOS), and Python developers use BDK seamlessly in their projects. And wrapped around all of this software is documentation and examples. For over a year the BDK team has been working on a major "),t("a",{attrs:{href:"https://bitcoindevkit.org/blog/tags/architecture/",target:"_blank",rel:"noopener noreferrer"}},[e._v("re-architecture"),t("OutboundLink")],1),e._v(" of the BDK libraries to improve blockchain syncing, embedded device support ("),t("a",{attrs:{href:"https://docs.rust-embedded.org/book/intro/no-std.html",target:"_blank",rel:"noopener noreferrer"}},[e._v("no-std"),t("OutboundLink")],1),e._v("), update key dependencies ("),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-bitcoin",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust-bitcoin"),t("OutboundLink")],1),e._v(", "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-miniscript",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust-miniscript"),t("OutboundLink")],1),e._v(") and finally to provide a stable 1.0 API that our users can rely on for their production applications.")]),e._v(" "),t("p",[e._v("The team is currently working on the 1.0.0-alpha release train. The purposed of these alpha releases is to give early adopters (including our own "),t("code",[e._v("bdk-ffi")]),e._v(" contributors) a chance to try-out new BDK features and updated APIs and provide feedback. Once we have a stable, feature complete 1.0.0 BDK that our alpha users love we'll begin publishing 1.0.0-beta releases. With our beta releases we will finish updating tutorials and examples and performance testing, and ask all BDK users to start migrating and testing their applications with BDK 1.0.0. When our key contributors and users are satisfied that we have shaken out any final 1.0.0-beta issues we'll publish our BDK 1.0.0 release. Once 1.0.0 is out subsequent releases will use "),t("a",{attrs:{href:"https://semver.org/",target:"_blank",rel:"noopener noreferrer"}},[e._v("semantic versioning"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("For those keeping score, we'd originally planned to have the BDK 1.0.0 release out last year, but (spoiler) that didn't happen. As I'm sure our kind readers understand making safe, feature rich, easy to use bitcoin software isn't easy, reviewing it is even harder, and we, like every project in the space are short-handed. But with every release, as we build the software we also on-board new contributors and build the team that will deliver BDK 1.0.0, 1.1.0, 2.0.0, and beyond.")]),e._v(" "),t("h3",{attrs:{id:"core-bdk"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#core-bdk"}},[e._v("#")]),e._v(" Core BDK")]),e._v(" "),t("p",[e._v("For Q4 2023 we "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/pulls?page=1&q=is%3Apr+merged%3A2023-10-01..2023-12-31",target:"_blank",rel:"noopener noreferrer"}},[e._v("merged 33 PRs"),t("OutboundLink")],1),e._v(", "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/issues?q=is%3Aissue+closed%3A2023-10-01..2023-12-31",target:"_blank",rel:"noopener noreferrer"}},[e._v("closed 32 issues"),t("OutboundLink")],1),e._v(", and completed two 1.0.0-alpha releases, "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/releases/tag/v1.0.0-alpha.2",target:"_blank",rel:"noopener noreferrer"}},[e._v("1.0.0-alpha.2"),t("OutboundLink")],1),e._v(" and "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/releases/tag/v1.0.0-alpha.3",target:"_blank",rel:"noopener noreferrer"}},[e._v("1.0.0-alpha.3"),t("OutboundLink")],1),e._v(". The primary deliverable of these releases was to further stabilize the "),t("code",[e._v("bdk_chain")]),e._v(" crate which provides the central logic for tracking and updating wallet keychains and scripts to be tracked and manages all of the related blockchain and transaction data. Additional PRs started this quarter lay the groundwork for the next phase of development focused on improving how we sync data via blockchain clients and save that data to persistent storage. We also made one maintenance release "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/releases/tag/v0.29.0",target:"_blank",rel:"noopener noreferrer"}},[e._v("0.29.0"),t("OutboundLink")],1),e._v(" that upgraded our "),t("code",[e._v("rust-bitcoin")]),e._v(" dependency to release to 0.30.")]),e._v(" "),t("h3",{attrs:{id:"bdk-ffi"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#bdk-ffi"}},[e._v("#")]),e._v(" BDK-FFI")]),e._v(" "),t("p",[e._v("In Q4 the BDK-FFI bindings for Kotlin, Swift, and Python saw "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk-ffi/pulls?page=1&q=is%3Apr+merged%3A2023-10-01..2023-12-31",target:"_blank",rel:"noopener noreferrer"}},[e._v("23 PRs merged"),t("OutboundLink")],1),e._v(" and "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk-ffi/issues?q=is%3Aissue+closed%3A2023-10-01..2023-12-31",target:"_blank",rel:"noopener noreferrer"}},[e._v("15 issues closed"),t("OutboundLink")],1),e._v(". One maintenance release was completed, "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk-ffi/releases/tag/v0.31.0",target:"_blank",rel:"noopener noreferrer"}},[e._v("v0.31.0"),t("OutboundLink")],1),e._v(", which updated the language bindings dependency to the latest rust "),t("code",[e._v("bdk")]),e._v(" maintenance release 0.29.0 and in doing so updated the BDK FFI "),t("code",[e._v("rust-bitcoin")]),e._v(" dependency to version 0.30. This quarter the team took on the major task of creating the first language bindings based on the "),t("code",[e._v("bdk")]),e._v(" 1.0.0-alpha API. The resulting "),t("code",[e._v("bdk-ffi")]),e._v(" "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk-ffi/releases/tag/v1.0.0-alpha.2a",target:"_blank",rel:"noopener noreferrer"}},[e._v("v1.0.0-alpha2a"),t("OutboundLink")],1),e._v(" release is only able to expose part of the full "),t("code",[e._v("bdk")]),e._v(" 1.0.0 API but prepares the project for full support in future releases. As part of this work the current Kotlin API docs were removed, but fear not they will return in future alpha releases and be better than ever with not only API docs for Kotlin but also Swift and Python.")]),e._v(" "),t("h3",{attrs:{id:"bdk-contributors-spotlight"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#bdk-contributors-spotlight"}},[e._v("#")]),e._v(" BDK contributors spotlight")]),e._v(" "),t("p",[e._v("In this section we share what some of our hardworking contributors are doing to educate people about BDK, help on board new projects, and generally promote bitcoin and open source development around the world.")]),e._v(" "),t("p",[t("strong",[t("a",{attrs:{href:"https://github.com/danielabrozzoni/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Daniela Brozzoni"),t("OutboundLink")],1)])]),e._v(" "),t("p",[e._v("November 3: Gave a "),t("a",{attrs:{href:"https://bolt.fun",target:"_blank",rel:"noopener noreferrer"}},[e._v("bolt.fun"),t("OutboundLink")],1),e._v(" talk on open source development, "),t("a",{attrs:{href:"https://www.youtube.com/watch?v=P75nCR1owws",target:"_blank",rel:"noopener noreferrer"}},[e._v("YouTube"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("October 25-26: Joined a "),t("a",{attrs:{href:"https://planb.lugano.ch/contributing-to-free-and-open-source-projects/",target:"_blank",rel:"noopener noreferrer"}},[e._v('"Contributing to free and open source projects" panel'),t("OutboundLink")],1),e._v(" at "),t("a",{attrs:{href:"https://planb.lugano.ch/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Plan B"),t("OutboundLink")],1),e._v(" lugano.")]),e._v(" "),t("p",[t("strong",[t("a",{attrs:{href:"https://github.com/evanlinjin/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Evan Linjin"),t("OutboundLink")],1)])]),e._v(" "),t("p",[e._v("November 15: Worked with "),t("a",{attrs:{href:"https://wizardsardine.com/",target:"_blank",rel:"noopener noreferrer"}},[e._v("wizardsardine"),t("OutboundLink")],1),e._v(" team to "),t("a",{attrs:{href:"https://twitter.com/darosior/status/1724842410839093562",target:"_blank",rel:"noopener noreferrer"}},[e._v("extract and integrate BDK coin-selection into the Liana wallet"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("December 3: Spoke at the "),t("a",{attrs:{href:"https://twitter.com/TaiwanBitdevs/status/1726537941688967238",target:"_blank",rel:"noopener noreferrer"}},[e._v("Bitcoin Tech Summit Taipei"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("December 13: Gave a talk about Bitcoin and BDK at "),t("a",{attrs:{href:"https://twitter.com/JCBA_org/status/1735100779172856170",target:"_blank",rel:"noopener noreferrer"}},[e._v("Taipei Blockchain Week"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[t("strong",[t("a",{attrs:{href:"https://github.com/thunderbiscuit/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Thunderbiscuit"),t("OutboundLink")],1)])]),e._v(" "),t("p",[e._v("November 8: Created the educational "),t("a",{attrs:{href:"https://opcodeexplained.com/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Opcode Explained"),t("OutboundLink")],1),e._v(" website to help... explain bitcoin opcodes!")]),e._v(" "),t("p",[e._v("November 15: Joined the panel on the "),t("a",{attrs:{href:"https://bitcoin.review/podcast/episode-55/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Bitcoin Review Podcast Episode 55"),t("OutboundLink")],1),e._v(" to talked about his "),t("a",{attrs:{href:"https://github.com/thunderbiscuit/padawan-wallet",target:"_blank",rel:"noopener noreferrer"}},[e._v("padawan-wallet"),t("OutboundLink")],1),e._v(" project.")]),e._v(" "),t("p",[t("strong",[t("a",{attrs:{href:"https://github.com/reez/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Matthew Ramsden"),t("OutboundLink")],1)])]),e._v(" "),t("p",[e._v("October 11: Spoke at the "),t("a",{attrs:{href:"https://www.meetup.com/bitcoinpark/events/291768716/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Bitcoin Park OpenHouse"),t("OutboundLink")],1),e._v(" on the topic "),t("a",{attrs:{href:"https://podcasts.apple.com/us/podcast/open-house-exploring-the-lightning-network-ldk/id1646515985?i=1000631904227",target:"_blank",rel:"noopener noreferrer"}},[e._v('"Exploring the Lightning Network"'),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("November 8: Created a video for the "),t("a",{attrs:{href:"https://www.youtube.com/@bitcoindevelopers",target:"_blank",rel:"noopener noreferrer"}},[e._v("Bitcoin Developers"),t("OutboundLink")],1),e._v(" channel on YouTube titled "),t("a",{attrs:{href:"https://www.youtube.com/watch?v=rcU3LU6iZCs",target:"_blank",rel:"noopener noreferrer"}},[e._v('"Lightning Development with Swift: Make Your First Lightning App with LDK Node Swift"'),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[t("strong",[e._v("Other current and future contributors...")])]),e._v(" "),t("p",[e._v("If you are a contributor to BDK and doing something fun that's BDK and/or bitcoin related let us know! Tag "),t("a",{attrs:{href:"https://twitter.com/bitcoindevkit/",target:"_blank",rel:"noopener noreferrer"}},[e._v("@bitcoindevkit"),t("OutboundLink")],1),e._v(" on X, "),t("a",{attrs:{href:"https://primal.net/profile/npub1ke470rdgnxg4gjs9cw3tv0dp690wl68f5xak5smflpsksedadd7qtf8jfm",target:"_blank",rel:"noopener noreferrer"}},[e._v("notmandatory"),t("OutboundLink")],1),e._v(" on nostr, or send us an email: blog at bitcoindevkit dot org.")])])}),[],!1,null,null,null);t.default=o.exports}}]); \ No newline at end of file +(window.webpackJsonp=window.webpackJsonp||[]).push([[38],{387:function(e,t,r){"use strict";r.r(t);var n=r(7),o=Object(n.a)({},(function(){var e=this,t=e._self._c;return t("ContentSlotsDistributor",{attrs:{"slot-key":e.$parent.slotKey}},[t("h3",{attrs:{id:"this-post"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#this-post"}},[e._v("#")]),e._v(" This Post")]),e._v(" "),t("p",[e._v("The "),t("a",{attrs:{href:"https://spiral.xyz",target:"_blank",rel:"noopener noreferrer"}},[e._v("Spiral"),t("OutboundLink")],1),e._v(" team has graciously supported BDK financially (and spiritually) for the past four years and since early 2022 the BDK team has let folks know what we've been up to via the "),t("a",{attrs:{href:"https://spiral.xyz/blog/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Spiral blog"),t("OutboundLink")],1),e._v(". As of last summer we are grateful to also have received a generous "),t("a",{attrs:{href:"https://opensats.org/blog/bitcoin-and-nostr-grants-august-2023",target:"_blank",rel:"noopener noreferrer"}},[e._v("OpenSats grant"),t("OutboundLink")],1),e._v(" supporting our project. To keep our current and future financial supporters, open source contributors, and downstream users updated on our progress, starting this year we will be publishing a quarterly BDK project updates here on our blog.")]),e._v(" "),t("h3",{attrs:{id:"end-of-year-review"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#end-of-year-review"}},[e._v("#")]),e._v(" End of Year Review")]),e._v(" "),t("p",[e._v("The BDK project is made up of a core suite of "),t("a",{attrs:{href:"https://www.rust-lang.org/",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust"),t("OutboundLink")],1),e._v(" libraries ("),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk?tab=readme-ov-file#architecture",target:"_blank",rel:"noopener noreferrer"}},[e._v("bdk-*"),t("OutboundLink")],1),e._v(") that work together to provide everything an application developer needs to incorporate on-chain bitcoin wallet functionality into their project. Wrapped around the BDK core libraries is our "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk-ffi",target:"_blank",rel:"noopener noreferrer"}},[e._v("bdk-ffi"),t("OutboundLink")],1),e._v(" bindings libraries that let Kotlin (desktop/android), Swift (desktop/iOS), and Python developers use BDK seamlessly in their projects. And wrapped around all of this software is documentation and examples. For over a year the BDK team has been working on a major "),t("a",{attrs:{href:"https://bitcoindevkit.org/blog/tags/architecture/",target:"_blank",rel:"noopener noreferrer"}},[e._v("re-architecture"),t("OutboundLink")],1),e._v(" of the BDK libraries to improve blockchain syncing, embedded device support ("),t("a",{attrs:{href:"https://docs.rust-embedded.org/book/intro/no-std.html",target:"_blank",rel:"noopener noreferrer"}},[e._v("no-std"),t("OutboundLink")],1),e._v("), update key dependencies ("),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-bitcoin",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust-bitcoin"),t("OutboundLink")],1),e._v(", "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-miniscript",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust-miniscript"),t("OutboundLink")],1),e._v(") and finally to provide a stable 1.0 API that our users can rely on for their production applications.")]),e._v(" "),t("p",[e._v("The team is currently working on the 1.0.0-alpha release train. The purposed of these alpha releases is to give early adopters (including our own "),t("code",[e._v("bdk-ffi")]),e._v(" contributors) a chance to try-out new BDK features and updated APIs and provide feedback. Once we have a stable, feature complete 1.0.0 BDK that our alpha users love we'll begin publishing 1.0.0-beta releases. With our beta releases we will finish updating tutorials and examples and performance testing, and ask all BDK users to start migrating and testing their applications with BDK 1.0.0. When our key contributors and users are satisfied that we have shaken out any final 1.0.0-beta issues we'll publish our BDK 1.0.0 release. Once 1.0.0 is out subsequent releases will use "),t("a",{attrs:{href:"https://semver.org/",target:"_blank",rel:"noopener noreferrer"}},[e._v("semantic versioning"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("For those keeping score, we'd originally planned to have the BDK 1.0.0 release out last year, but (spoiler) that didn't happen. As I'm sure our kind readers understand making safe, feature rich, easy to use bitcoin software isn't easy, reviewing it is even harder, and we, like every project in the space are short-handed. But with every release, as we build the software we also on-board new contributors and build the team that will deliver BDK 1.0.0, 1.1.0, 2.0.0, and beyond.")]),e._v(" "),t("h3",{attrs:{id:"core-bdk"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#core-bdk"}},[e._v("#")]),e._v(" Core BDK")]),e._v(" "),t("p",[e._v("For Q4 2023 we "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/pulls?page=1&q=is%3Apr+merged%3A2023-10-01..2023-12-31",target:"_blank",rel:"noopener noreferrer"}},[e._v("merged 33 PRs"),t("OutboundLink")],1),e._v(", "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/issues?q=is%3Aissue+closed%3A2023-10-01..2023-12-31",target:"_blank",rel:"noopener noreferrer"}},[e._v("closed 32 issues"),t("OutboundLink")],1),e._v(", and completed two 1.0.0-alpha releases, "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/releases/tag/v1.0.0-alpha.2",target:"_blank",rel:"noopener noreferrer"}},[e._v("1.0.0-alpha.2"),t("OutboundLink")],1),e._v(" and "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/releases/tag/v1.0.0-alpha.3",target:"_blank",rel:"noopener noreferrer"}},[e._v("1.0.0-alpha.3"),t("OutboundLink")],1),e._v(". The primary deliverable of these releases was to further stabilize the "),t("code",[e._v("bdk_chain")]),e._v(" crate which provides the central logic for tracking and updating wallet keychains and scripts to be tracked and manages all of the related blockchain and transaction data. Additional PRs started this quarter lay the groundwork for the next phase of development focused on improving how we sync data via blockchain clients and save that data to persistent storage. We also made one maintenance release "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/releases/tag/v0.29.0",target:"_blank",rel:"noopener noreferrer"}},[e._v("0.29.0"),t("OutboundLink")],1),e._v(" that upgraded our "),t("code",[e._v("rust-bitcoin")]),e._v(" dependency to release to 0.30.")]),e._v(" "),t("h3",{attrs:{id:"bdk-ffi"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#bdk-ffi"}},[e._v("#")]),e._v(" BDK-FFI")]),e._v(" "),t("p",[e._v("In Q4 the BDK-FFI bindings for Kotlin, Swift, and Python saw "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk-ffi/pulls?page=1&q=is%3Apr+merged%3A2023-10-01..2023-12-31",target:"_blank",rel:"noopener noreferrer"}},[e._v("23 PRs merged"),t("OutboundLink")],1),e._v(" and "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk-ffi/issues?q=is%3Aissue+closed%3A2023-10-01..2023-12-31",target:"_blank",rel:"noopener noreferrer"}},[e._v("15 issues closed"),t("OutboundLink")],1),e._v(". One maintenance release was completed, "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk-ffi/releases/tag/v0.31.0",target:"_blank",rel:"noopener noreferrer"}},[e._v("v0.31.0"),t("OutboundLink")],1),e._v(", which updated the language bindings dependency to the latest rust "),t("code",[e._v("bdk")]),e._v(" maintenance release 0.29.0 and in doing so updated the BDK FFI "),t("code",[e._v("rust-bitcoin")]),e._v(" dependency to version 0.30. This quarter the team took on the major task of creating the first language bindings based on the "),t("code",[e._v("bdk")]),e._v(" 1.0.0-alpha API. The resulting "),t("code",[e._v("bdk-ffi")]),e._v(" "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk-ffi/releases/tag/v1.0.0-alpha.2a",target:"_blank",rel:"noopener noreferrer"}},[e._v("v1.0.0-alpha2a"),t("OutboundLink")],1),e._v(" release is only able to expose part of the full "),t("code",[e._v("bdk")]),e._v(" 1.0.0 API but prepares the project for full support in future releases. As part of this work the current Kotlin API docs were removed, but fear not they will return in future alpha releases and be better than ever with not only API docs for Kotlin but also Swift and Python.")]),e._v(" "),t("h3",{attrs:{id:"bdk-contributors-spotlight"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#bdk-contributors-spotlight"}},[e._v("#")]),e._v(" BDK contributors spotlight")]),e._v(" "),t("p",[e._v("In this section we share what some of our hardworking contributors are doing to educate people about BDK, help on board new projects, and generally promote bitcoin and open source development around the world.")]),e._v(" "),t("p",[t("strong",[t("a",{attrs:{href:"https://github.com/danielabrozzoni/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Daniela Brozzoni"),t("OutboundLink")],1)])]),e._v(" "),t("p",[e._v("November 3: Gave a "),t("a",{attrs:{href:"https://bolt.fun",target:"_blank",rel:"noopener noreferrer"}},[e._v("bolt.fun"),t("OutboundLink")],1),e._v(" talk on open source development, "),t("a",{attrs:{href:"https://www.youtube.com/watch?v=P75nCR1owws",target:"_blank",rel:"noopener noreferrer"}},[e._v("YouTube"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("October 25-26: Joined a "),t("a",{attrs:{href:"https://planb.lugano.ch/contributing-to-free-and-open-source-projects/",target:"_blank",rel:"noopener noreferrer"}},[e._v('"Contributing to free and open source projects" panel'),t("OutboundLink")],1),e._v(" at "),t("a",{attrs:{href:"https://planb.lugano.ch/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Plan B"),t("OutboundLink")],1),e._v(" lugano.")]),e._v(" "),t("p",[t("strong",[t("a",{attrs:{href:"https://github.com/evanlinjin/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Evan Linjin"),t("OutboundLink")],1)])]),e._v(" "),t("p",[e._v("November 15: Worked with "),t("a",{attrs:{href:"https://wizardsardine.com/",target:"_blank",rel:"noopener noreferrer"}},[e._v("wizardsardine"),t("OutboundLink")],1),e._v(" team to "),t("a",{attrs:{href:"https://twitter.com/darosior/status/1724842410839093562",target:"_blank",rel:"noopener noreferrer"}},[e._v("extract and integrate BDK coin-selection into the Liana wallet"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("December 3: Spoke at the "),t("a",{attrs:{href:"https://twitter.com/TaiwanBitdevs/status/1726537941688967238",target:"_blank",rel:"noopener noreferrer"}},[e._v("Bitcoin Tech Summit Taipei"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("December 13: Gave a talk about Bitcoin and BDK at "),t("a",{attrs:{href:"https://twitter.com/JCBA_org/status/1735100779172856170",target:"_blank",rel:"noopener noreferrer"}},[e._v("Taipei Blockchain Week"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[t("strong",[t("a",{attrs:{href:"https://github.com/thunderbiscuit/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Thunderbiscuit"),t("OutboundLink")],1)])]),e._v(" "),t("p",[e._v("November 8: Created the educational "),t("a",{attrs:{href:"https://opcodeexplained.com/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Opcode Explained"),t("OutboundLink")],1),e._v(" website to help... explain bitcoin opcodes!")]),e._v(" "),t("p",[e._v("November 15: Joined the panel on the "),t("a",{attrs:{href:"https://bitcoin.review/podcast/episode-55/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Bitcoin Review Podcast Episode 55"),t("OutboundLink")],1),e._v(" to talked about his "),t("a",{attrs:{href:"https://github.com/thunderbiscuit/padawan-wallet",target:"_blank",rel:"noopener noreferrer"}},[e._v("padawan-wallet"),t("OutboundLink")],1),e._v(" project.")]),e._v(" "),t("p",[t("strong",[t("a",{attrs:{href:"https://github.com/reez/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Matthew Ramsden"),t("OutboundLink")],1)])]),e._v(" "),t("p",[e._v("October 11: Spoke at the "),t("a",{attrs:{href:"https://www.meetup.com/bitcoinpark/events/291768716/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Bitcoin Park OpenHouse"),t("OutboundLink")],1),e._v(" on the topic "),t("a",{attrs:{href:"https://podcasts.apple.com/us/podcast/open-house-exploring-the-lightning-network-ldk/id1646515985?i=1000631904227",target:"_blank",rel:"noopener noreferrer"}},[e._v('"Exploring the Lightning Network"'),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("November 8: Created a video for the "),t("a",{attrs:{href:"https://www.youtube.com/@bitcoindevelopers",target:"_blank",rel:"noopener noreferrer"}},[e._v("Bitcoin Developers"),t("OutboundLink")],1),e._v(" channel on YouTube titled "),t("a",{attrs:{href:"https://www.youtube.com/watch?v=rcU3LU6iZCs",target:"_blank",rel:"noopener noreferrer"}},[e._v('"Lightning Development with Swift: Make Your First Lightning App with LDK Node Swift"'),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[t("strong",[e._v("Other current and future contributors...")])]),e._v(" "),t("p",[e._v("If you are a contributor to BDK and doing something fun that's BDK and/or bitcoin related let us know! Tag "),t("a",{attrs:{href:"https://twitter.com/bitcoindevkit/",target:"_blank",rel:"noopener noreferrer"}},[e._v("@bitcoindevkit"),t("OutboundLink")],1),e._v(" on X, "),t("a",{attrs:{href:"https://primal.net/profile/npub1ke470rdgnxg4gjs9cw3tv0dp690wl68f5xak5smflpsksedadd7qtf8jfm",target:"_blank",rel:"noopener noreferrer"}},[e._v("notmandatory"),t("OutboundLink")],1),e._v(" on nostr, or send us an email: blog at bitcoindevkit dot org.")])])}),[],!1,null,null,null);t.default=o.exports}}]); \ No newline at end of file diff --git a/assets/js/39.b76a2ad0.js b/assets/js/39.38046c48.js similarity index 99% rename from assets/js/39.b76a2ad0.js rename to assets/js/39.38046c48.js index 64bd78a0b4..c7fd7206fb 100644 --- a/assets/js/39.b76a2ad0.js +++ b/assets/js/39.38046c48.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[39],{385:function(t,s,a){"use strict";a.r(s);var n=a(7),e=Object(n.a)({},(function(){var t=this,s=t._self._c;return s("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[s("h2",{attrs:{id:"introduction"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#introduction"}},[t._v("#")]),t._v(" Introduction")]),t._v(" "),s("p",[t._v("BDK wallet developer library can be used to easily deploy wallets with various kinds of blockchain backend support, like "),s("a",{attrs:{href:"https://github.com/romanz/electrs",target:"_blank",rel:"noopener noreferrer"}},[s("code",[t._v("electrum")]),s("OutboundLink")],1),t._v(", "),s("a",{attrs:{href:"https://github.com/Blockstream/esplora",target:"_blank",rel:"noopener noreferrer"}},[s("code",[t._v("esplora")]),s("OutboundLink")],1),t._v(", "),s("code",[t._v("compact-filters")]),t._v(" ("),s("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0157.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[t._v("BIP157"),s("OutboundLink")],1),t._v(") etc. With the latest release of BDK "),s("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/releases/tag/v0.10.0",target:"_blank",rel:"noopener noreferrer"}},[s("code",[t._v("v0.10.0")]),s("OutboundLink")],1),t._v(", BDK now supports Bitcoin Core as a blockchain backend. BDK talks with Bitcoin Core using rust-bitcoin's "),s("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-bitcoincore-rpc",target:"_blank",rel:"noopener noreferrer"}},[t._v("bitcoincore-rpc"),s("OutboundLink")],1),t._v(" library.")]),t._v(" "),s("p",[t._v("This allows wallet devs to quickly deploy their wallet that can talk to a bitcoin full node (home raspi nodes) out of the box. Wallet devs don't need to worry about connecting to a full node with correct RPC calls, all of that is handled by BDK under the hood. All they need is to identify the full node's RPC IP address and the correct RPC credentials.")]),t._v(" "),s("p",[t._v("In this tutorial we will see how to write a very simplistic wallet code that can connect to a bitcoin core node and maintain its balance and make transactions.")]),t._v(" "),s("p",[t._v("Unlike other tutorials, we will not use "),s("code",[t._v("bdk-cli")]),t._v(" tools, but instead write rust code directly using "),s("code",[t._v("BDK")]),t._v(" devkit. In the end we will end up with our own simple bitcoin wallet.")]),t._v(" "),s("h2",{attrs:{id:"prerequisite"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#prerequisite"}},[t._v("#")]),t._v(" Prerequisite")]),t._v(" "),s("p",[t._v("To run with this tutorial you would need to have a bitcoin core node running in regtest mode. Get the bitcoin core binary either from the "),s("a",{attrs:{href:"https://bitcoincore.org/bin/bitcoin-core-0.21.1/",target:"_blank",rel:"noopener noreferrer"}},[t._v("bitcoin core repo"),s("OutboundLink")],1),t._v(" or "),s("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/blob/v0.21.1/doc/build-unix.md",target:"_blank",rel:"noopener noreferrer"}},[t._v("build from source"),s("OutboundLink")],1),t._v(".")]),t._v(" "),s("p",[t._v("Then configure the node with a following "),s("code",[t._v("bitcoin.conf")]),t._v(" file")]),t._v(" "),s("div",{staticClass:"language-txt extra-class"},[s("pre",{pre:!0,attrs:{class:"language-txt"}},[s("code",[t._v("regtest=1\nfallbackfee=0.0001\nserver=1\ntxindex=1\nrpcuser=admin\nrpcpassword=password\n")])])]),s("p",[t._v("Apart from that, you would need to install rust in your system. Grab the installation one-liner from "),s("a",{attrs:{href:"https://www.rust-lang.org/tools/install",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),s("OutboundLink")],1),t._v(".")]),t._v(" "),s("h2",{attrs:{id:"setting-up"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#setting-up"}},[t._v("#")]),t._v(" Setting Up")]),t._v(" "),s("p",[t._v("Create a new cargo binary repository.")]),t._v(" "),s("div",{staticClass:"language-shell extra-class"},[s("pre",{pre:!0,attrs:{class:"language-shell"}},[s("code",[s("span",{pre:!0,attrs:{class:"token function"}},[t._v("mkdir")]),t._v(" ~/tutorial\n"),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("cd")]),t._v(" tutorial\n"),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("cargo")]),t._v(" new bdk-example\n"),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("cd")]),t._v(" bdk-example\n")])])]),s("p",[t._v("This will create a new project folder named "),s("code",[t._v("bdk-example")]),t._v(" with "),s("code",[t._v("src/main.rs")]),t._v(" and a "),s("code",[t._v("cargo.toml")]),t._v(".")]),t._v(" "),s("div",{staticClass:"language-shell extra-class"},[s("pre",{pre:!0,attrs:{class:"language-shell"}},[s("code",[t._v("$ tree "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-L")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("3")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(".")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(".")]),t._v("\n├── Cargo.toml\n└── src\n └── main.rs\n\n"),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("1")]),t._v(" directory, "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("2")]),t._v(" files\n")])])]),s("p",[t._v("Opening "),s("code",[t._v("main.rs")]),t._v(" you will see some predefined code like this")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fn")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function-definition function"}},[t._v("main")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token macro property"}},[t._v("println!")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Hello, world!"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("p",[t._v("Try running "),s("code",[t._v("cargo run")]),t._v(' and if everything is set, you should see "Hello, world!" printed in your terminal')]),t._v(" "),s("div",{staticClass:"language-shell extra-class"},[s("pre",{pre:!0,attrs:{class:"language-shell"}},[s("code",[t._v("$ "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("cargo")]),t._v(" run\n Compiling bdk-example v0.1.0 "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("/home/raj/github-repo/tutorial/bdk-example"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n Finished dev "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("unoptimized + debuginfo"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" target"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("s"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("in")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),t._v(".95s\n Running "),s("span",{pre:!0,attrs:{class:"token variable"}},[s("span",{pre:!0,attrs:{class:"token variable"}},[t._v("`")]),t._v("target/debug/bdk-example"),s("span",{pre:!0,attrs:{class:"token variable"}},[t._v("`")])]),t._v("\nHello, world"),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n")])])]),s("p",[t._v("Of course we will not use the given "),s("code",[t._v("println!()")]),t._v(" statement, but we will put our main code in the "),s("code",[t._v("main()")]),t._v(" function.")]),t._v(" "),s("p",[s("code",[t._v("cargo new")]),t._v(" will also produce a skeleton "),s("code",[t._v("Cargo.toml")]),t._v(" file like this")]),t._v(" "),s("div",{staticClass:"language-toml extra-class"},[s("pre",{pre:!0,attrs:{class:"language-toml"}},[s("code",[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),s("span",{pre:!0,attrs:{class:"token table class-name"}},[t._v("package")]),s("span",{pre:!0,attrs:{class:"token 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punctuation"}},[t._v("[")]),s("span",{pre:!0,attrs:{class:"token table class-name"}},[t._v("dependencies")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v("\n")])])]),s("h2",{attrs:{id:"setting-dependencies"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#setting-dependencies"}},[t._v("#")]),t._v(" Setting dependencies")]),t._v(" "),s("p",[t._v("Once the rust binary is compiled and running, we now need to specify the dependencies we need to work on our library.")]),t._v(" "),s("p",[t._v("Remember that BDK provides almost everything we would need to build a wallet out of the box. So we don't need any more dependencies apart from BDK. We will use another small rust crate called "),s("a",{attrs:{href:"https://crates.io/crates/dirs-next",target:"_blank",rel:"noopener noreferrer"}},[s("code",[t._v("dirs_next")]),s("OutboundLink")],1),t._v(" to find our home directory and store wallet files in a subfolder there.")]),t._v(" "),s("p",[t._v("Add the dependencies into "),s("code",[t._v("Cargo.toml")]),t._v(" like below")]),t._v(" "),s("div",{staticClass:"language-toml extra-class"},[s("pre",{pre:!0,attrs:{class:"language-toml"}},[s("code",[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),s("span",{pre:!0,attrs:{class:"token table class-name"}},[t._v("package")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token key property"}},[t._v("name")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"bdk-example"')]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token 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to add our wallet code.")]),t._v(" "),s("h2",{attrs:{id:"getting-descriptors"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#getting-descriptors"}},[t._v("#")]),t._v(" Getting Descriptors")]),t._v(" "),s("p",[t._v("BDK is a descriptor based wallet library. That means when we specify our wallet key-chain we need to tell BDK about it in the format of a descriptor. You can read up on descriptors more "),s("a",{attrs:{href:"https://bitcoindevkit.org/descriptors/",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),s("OutboundLink")],1),t._v(". A descriptor string looks like this\n"),s("code",[t._v("\"wpkh([b8b575c2/84'/1'/0'/0]tprv8icWtRzy9CWgFxpGMLSdAeE4wWyz39XGc6SwykeTo13tYm14JkVVQAf7jz8WDDarCgNJrG3aEPJEqchDWeJdiaWpS3FwbLB9SzsN57V7qxB/*)\"")]),t._v(".")]),t._v(" "),s("p",[t._v("This describes a SegwitV0 descriptor of a key derived at path "),s("code",[t._v("m/84'/1'/0'/0")]),t._v(". If you already have a descriptor from other sources, you can use that. Otherwise, BDK has your back. BDK can be used to generate a fresh master key with mnemonic, and then derive child keys from it given a specific path. Putting the key in a descriptor is as simple as wrapping it with a "),s("code",[t._v("wpkh()")]),t._v(" string.")]),t._v(" "),s("p",[t._v("We will use a dedicated function that will create fresh receive and change descriptors from BDK for our purpose. It will also generate the mnemonic word list for later regenerating the wallet. But we will ignore that for our scope.")]),t._v(" "),s("p",[t._v("Add a function named "),s("code",[t._v("get-descriptor()")]),t._v(" below the "),s("code",[t._v("main()")]),t._v(" function as shown")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fn")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function-definition function"}},[t._v("main")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("...")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// generate fresh descriptor strings and return them via (receive, change) 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punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"recv: {:#?}, \\nchng: {:#?}"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" receive_desc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" change_desc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fn")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function-definition function"}},[t._v("get_descriptors")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("->")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("String")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("String")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("...")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("p",[t._v("Running the binary should produce the following result")]),t._v(" "),s("div",{staticClass:"language-shell extra-class"},[s("pre",{pre:!0,attrs:{class:"language-shell"}},[s("code",[t._v("$ "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("cargo")]),t._v(" run\nrecv: "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v("\"wpkh([89df6a67/84'/1'/0'/0]tprv8iSRXyLtTKJN9qt1jyPVqwhDMEaYztXunPaRQznaH1z8gj8e2g7RnF2ZoHP56VEXwMn76AiV1Je6nJmZbFistwAQCrRGmSrsoKfdqfTDNA1/*)\"")]),t._v(", \nchng: "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v("\"wpkh([89df6a67/84'/1'/0'/1]tprv8iSRXyLtTKJNCECQxBJ19cgx2ueS7mC7GNq7VqTWY3RNPMBY7DfTb9HUnXpJqa14jCJNRmi4yGxfoTVS4WLBXDkvTLq4vujeAD9NfDtSxGP/*)\"")]),t._v("\n")])])]),s("p",[t._v("Voila! Now we have nice descriptors strings handy to use for our BDK wallet construction.")]),t._v(" "),s("h2",{attrs:{id:"talking-to-bitcoin-core-programmatically"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#talking-to-bitcoin-core-programmatically"}},[t._v("#")]),t._v(" Talking to Bitcoin Core Programmatically")]),t._v(" "),s("p",[t._v("Like all other tutorials we will use two wallets to send coins back and forth. A Bitcoin Core wallet accessible via "),s("code",[t._v("bitcoin-cli")]),t._v(" command line tools, and a BDK wallet maintained by BDK library.")]),t._v(" "),s("p",[t._v("But unlike other tutorials, we won't be using "),s("code",[t._v("bitcoin-cli")]),t._v(" to talk to the Core wallet (we can, but let's spice things up). Instead, we will use the "),s("code",[t._v("bitcoin-rpc")]),t._v(" library, to talk with our core node listening at "),s("code",[t._v("127.0.0.1:18443")]),t._v(", from inside our main function. This will allow us to write code, that will handle both the core and BDK wallet, from inside of the same function, and we won't have to switch terminals!")]),t._v(" "),s("p",[t._v("Remember we imported "),s("code",[t._v("use bdk::bitcoincore_rpc::{Auth as rpc_auth, Client, RpcApi};")]),t._v("? Thats exactly for this purpose.")]),t._v(" "),s("p",[t._v("Start the "),s("code",[t._v("bitcoind")]),t._v(" node.")]),t._v(" "),s("p",[t._v("you should see bitcoind listening at port 18443")]),t._v(" "),s("div",{staticClass:"language-shell extra-class"},[s("pre",{pre:!0,attrs:{class:"language-shell"}},[s("code",[t._v("$ "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("sudo")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("netstat")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-nptl")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("grep")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("18443")]),t._v(" \ntcp "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0.0")]),t._v(".0.0:18443 "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0.0")]),t._v(".0.0:* LISTEN "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("135532")]),t._v("/bitcoind \n")])])]),s("p",[t._v("Lets create a core rpc interface in our main function.")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fn")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function-definition function"}},[t._v("main")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("...")]),t._v("\n \n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Create a RPC interface")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" rpc_auth "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("rpc_auth"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("UserPass")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"admin"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("to_string")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"password"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("to_string")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v(" \n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" core_rpc "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Client")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("new")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"http://127.0.0.1:18443/wallet/test"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("to_string")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" rpc_auth"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token macro property"}},[t._v("println!")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"{:#?}"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" core_rpc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("get_blockchain_info")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("p",[t._v("We have provided our RPC authentication "),s("code",[t._v("username")]),t._v(" and "),s("code",[t._v("password")]),t._v(" (same as provided in "),s("code",[t._v("bitcoin.conf")]),t._v(" file).\nWe have provided the RPC address of our local bitcoin node, with the path to a wallet file, named "),s("code",[t._v("test")]),t._v(". And then asked the rpc client to give us the current blockchain info.\nIf everything goes well, running "),s("code",[t._v("cargo run")]),t._v(" you should see an output like below:")]),t._v(" "),s("div",{staticClass:"language-shell extra-class"},[s("pre",{pre:!0,attrs:{class:"language-shell"}},[s("code",[t._v("$ "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("cargo")]),t._v(" run\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("..")]),t._v(".\nGetBlockchainInfoResult "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n chain: "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"regtest"')]),t._v(",\n blocks: "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),t._v(",\n headers: "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),t._v(",\n best_block_hash: 0f9188f13cb7b2c71f2a335e3a4fc328bf5beb436012afca590b1a11466e2206,\n difficulty: "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0.00000000046565423739069247")]),t._v(",\n median_time: "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("1296688602")]),t._v(",\n verification_progress: "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("1.0")]),t._v(",\n initial_block_download: true,\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("..")]),t._v(".\n")])])]),s("p",[t._v("Thats it. Now we can programmatically talk to our core node.")]),t._v(" "),s("h2",{attrs:{id:"get-some-balance-in-core-wallet"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#get-some-balance-in-core-wallet"}},[t._v("#")]),t._v(" Get some balance in core wallet.")]),t._v(" "),s("p",[t._v("We have told our rpc client that we would use a wallet named "),s("code",[t._v("test")]),t._v(". But currently, our core node doesn't have such a wallet. So let's create the wallet and fund it with some test coins.")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fn")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function-definition function"}},[t._v("main")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("...")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Create the test wallet ")]),t._v("\n core_rpc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("create_wallet")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"test"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n \n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Get a new address")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" core_address "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" core_rpc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("get_new_address")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n \n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Generate 101 blocks and use the above address as coinbase")]),t._v("\n core_rpc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("generate_to_address")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("101")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("core_address"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n \n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// fetch the new balance")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" core_balance "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" core_rpc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("get_balance")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n \n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Show balance")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token macro property"}},[t._v("println!")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"core balance: {:#?}"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" core_balance"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("p",[t._v("This will create a wallet in bitcoin core named "),s("code",[t._v("test")]),t._v(". generate 101 blocks and use a new address from the wallet as coinbase wallet. Because required coinbase maturity in bitcoin is 100 blocks, by generating 101 blocks, we will have the balance of the first coinbase block reward available for use.\nThe last "),s("code",[t._v("println!()")]),t._v(" statement will show the new updated balance as 50 BTC.")]),t._v(" "),s("div",{staticClass:"language-shell extra-class"},[s("pre",{pre:!0,attrs:{class:"language-shell"}},[s("code",[t._v("$ "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("cargo")]),t._v(" run\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("..")]),t._v(".\ncore balance: Amount"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("50.00000000")]),t._v(" BTC"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" \n")])])]),s("p",[t._v("Great! We now have 50 regtest BTC to play with.")]),t._v(" "),s("h2",{attrs:{id:"setup-the-bdk-wallet"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#setup-the-bdk-wallet"}},[t._v("#")]),t._v(" Setup the BDK wallet")]),t._v(" "),s("p",[t._v("Now that we are done setting up the core wallet. The last remaining step is to setup the BDK wallet. For this we will use the previous descriptor generation function and write code as below.")]),t._v(" "),s("p",[s("strong",[t._v("Note")]),t._v(": You might want to comment out the previous code in "),s("code",[t._v("main()")]),t._v(", as running them again will create more coins in core, which isn't an issue, but might be confusing.")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fn")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function-definition function"}},[t._v("main")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("...")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Get receive and change 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wallet_name"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n skip_blocks"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Use the above configuration to create a RPC blockchain backend")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" blockchain "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("RpcBlockchain")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token 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punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("p",[t._v("That's a lot of code. They are divided into logical sections. Let's discuss each step one by one.")]),t._v(" "),s("ul",[s("li",[t._v("First we used our previous "),s("code",[t._v("get_descriptors()")]),t._v(" function to generate two descriptor strings. One for generating receive addresses and one for change addresses.")]),t._v(" "),s("li",[t._v("Then we used a special function from BDK called "),s("code",[t._v("wallet_name_from_descriptor()")]),t._v(" to derive a name of the wallet from our descriptors. This allows us to have wallet names deterministically linked with descriptors. So in future if we use a different descriptor, the wallet will automatically have a different name. This allows us to not mix wallet names with same descriptor, and given the descriptors we can always determine what was the name we used. It is recommended to derive wallet names like this while using a core backend. Note that this wallet will be created inside the core node. So just like we accessed the "),s("code",[t._v("test")]),t._v(" wallet, we could also access this wallet.")]),t._v(" "),s("li",[t._v("Then we created a data directory at path "),s("code",[t._v("/home/username/.bdk-example")]),t._v(". We use "),s("code",[t._v("dirs_next")]),t._v(" to find our home path, and then appended that with "),s("code",[t._v(".bdk-example")]),t._v(". All the BDK wallet files will be created and maintained in that directory. In the Database we instructed BDK to create a new "),s("code",[t._v("Tree")]),t._v(" with "),s("code",[t._v("wallet_name")]),t._v(", so given a descriptor, BDK will always know which DB Tree to refer ("),s("code",[t._v("Tree")]),t._v(" is a "),s("code",[t._v("sled")]),t._v(" specific term).")]),t._v(" "),s("li",[t._v("Then like we did previously, we created the rpc username/password authentication, and specified the rpc url. Note that we cannot use the same "),s("code",[t._v("rpc_auth")]),t._v(" we used before for "),s("code",[t._v("core_rpc")]),t._v(" as BDK auth and bitcoin-rpc auth are slightly separate structures.")]),t._v(" "),s("li",[t._v("We combined all this information and created an "),s("code",[t._v("RpcConfig")]),t._v(" structure.")]),t._v(" "),s("li",[t._v("We used the rpc configuration to create a "),s("code",[t._v("RpcBlockchain")]),t._v(" structure.")]),t._v(" "),s("li",[t._v("Finally we used the Descriptors, Database, and Blockchain to create our final BDK "),s("code",[t._v("wallet")]),t._v(" structure.")])]),t._v(" "),s("p",[t._v("Now that we have our wallet cooked, in the end, we instructed it to sync with the bitcoin core backend, and fetch us a new address.")]),t._v(" "),s("p",[t._v("If all goes well, you should see an address printed in the terminal.")]),t._v(" "),s("div",{staticClass:"language-shell extra-class"},[s("pre",{pre:!0,attrs:{class:"language-shell"}},[s("code",[s("span",{pre:!0,attrs:{class:"token function"}},[t._v("cargo")]),t._v(" run\n Finished dev "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("unoptimized + debuginfo"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" target"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("s"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("in")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("2")]),t._v(".99s\n Running "),s("span",{pre:!0,attrs:{class:"token variable"}},[s("span",{pre:!0,attrs:{class:"token variable"}},[t._v("`")]),t._v("target/debug/bdk-example"),s("span",{pre:!0,attrs:{class:"token variable"}},[t._v("`")])]),t._v("\nbdk address: bcrt1q9vkmujggvzs0rd4z6069v3v0jucje7ua7ap308\n")])])]),s("h2",{attrs:{id:"sending-sats-around"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#sending-sats-around"}},[t._v("#")]),t._v(" Sending Sats Around")]),t._v(" "),s("p",[t._v("Now that we have covered all the groundwork, we have all we need to send coins back and forth between core and BDK wallet.")]),t._v(" "),s("p",[t._v("We will keep things simple here and make the following actions")]),t._v(" "),s("ul",[s("li",[t._v("Send 10 BTC from Core to BDK")]),t._v(" "),s("li",[t._v("Send back 5 BTC from BDK to Core")]),t._v(" "),s("li",[t._v("Display balance of two wallets")])]),t._v(" "),s("p",[t._v("In the last line of previous section we got a new address from BDK wallet. We will start from there. Without further discussion lets jump straight into code.")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fn")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function-definition function"}},[t._v("main")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("...")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Fetch a fresh address to receive coins")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" address "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" wallet"),s("span",{pre:!0,attrs:{class:"token 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The only new thing added is "),s("code",[t._v("wallet.build_tx()")]),t._v(" which returns a "),s("code",[t._v("TxBuilder")]),t._v(". BDK allows us to have very fine grained control of cooking up transactions. Almost everything that is possible to do with a Bitcoin transaction can be done in BDK. Here we have a very simple vanilla transaction with no added magic. To get full list of capabilities that "),s("code",[t._v("TxBuilder")]),t._v(" supports scour its implementation "),s("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/blob/38d1d0b0e29d38cd370c740d798d96a3c9fcaa1f/src/wallet/tx_builder.rs#L123-L153",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),s("OutboundLink")],1),t._v(".")]),t._v(" "),s("p",[t._v("Finally to step through what we did above:")]),t._v(" "),s("ul",[s("li",[t._v("We asked core wallet to send 10 BTC to bdk wallet address.")]),t._v(" "),s("li",[t._v("We confirmed the transaction, and synced the wallet.")]),t._v(" "),s("li",[t._v("We asked BDK to create a transaction sending 5 BTC to core wallet address.")]),t._v(" "),s("li",[t._v("We signed and broadcast the transaction. BDK will use the same core node to broadcast the transaction to network.")]),t._v(" "),s("li",[t._v("We confirmed the transaction by mining a block, and synced the wallet.")]),t._v(" "),s("li",[t._v("We fetched and displayed balance of both core and BDK wallet.")])]),t._v(" "),s("p",[t._v("If all goes well, you should see the final updated balance as below:")]),t._v(" "),s("div",{staticClass:"language-shell extra-class"},[s("pre",{pre:!0,attrs:{class:"language-shell"}},[s("code",[t._v("$ "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("cargo")]),t._v(" run\n Compiling bdk-example v0.1.0 "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("/home/raj/github-repo/bdk-example/bdk-example"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n Finished dev "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("unoptimized + debuginfo"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" target"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("s"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("in")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("3")]),t._v(".57s\n Running "),s("span",{pre:!0,attrs:{class:"token variable"}},[s("span",{pre:!0,attrs:{class:"token variable"}},[t._v("`")]),t._v("target/debug/bdk-example"),s("span",{pre:!0,attrs:{class:"token variable"}},[t._v("`")])]),t._v("\ncore wallet balance: Amount"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("144.99998590")]),t._v(" BTC"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\nBDK wallet balance: Amount"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("4.99999859")]),t._v(" BTC"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),s("p",[t._v("Voila! We have ~145 BTC (150 - 5) in core wallet and 5 BTC (10 - 5) in BDK wallet. The slight deficiency in the amount are due to transaction fees. Because we are using regtest, the fee is some standard value hardcoded in core node.")]),t._v(" "),s("p",[t._v("Check out the data directory where BDK has created the wallet data files.")]),t._v(" "),s("div",{staticClass:"language-shell extra-class"},[s("pre",{pre:!0,attrs:{class:"language-shell"}},[s("code",[t._v("$ "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("ls")]),t._v(" ~/.bdk-example/\nblobs conf db snap.0000000000023CAB\n")])])]),s("p",[t._v("And finally, this is what the final "),s("code",[t._v("main.rs")]),t._v(" file looks like.")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("use")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("bdk"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),t._v("bitcoin"),s("span",{pre:!0,attrs:{class:"token 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punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("UserPass")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"admin"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("to_string")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"password"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("to_string")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v(" \n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" core_rpc "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Client")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("new")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"http://127.0.0.1:18443/wallet/test"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("to_string")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" rpc_auth"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Create the test wallet ")]),t._v("\n core_rpc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("create_wallet")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"test"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n \n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Get a new address")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" core_address "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" core_rpc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("get_new_address")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n \n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Generate 101 blocks and use the above address as coinbase")]),t._v("\n core_rpc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("generate_to_address")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("101")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("core_address"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Get receive and change descriptor")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("receive_desc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" change_desc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("get_descriptors")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n \n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Use deterministic wallet name derived from descriptor")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" wallet_name "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("wallet_name_from_descriptor")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("receive_desc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Some")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("change_desc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Network")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Regtest")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Secp256k1")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("new")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Create the datadir to store wallet data")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("mut")]),t._v(" datadir "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("dirs_next"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("home_dir")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n datadir"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("push")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('".bdk-example"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" database "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("sled"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("open")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("datadir"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" db_tree "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" database"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("open_tree")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("wallet_name"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("clone")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Set RPC username and password")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" auth "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Auth")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("UserPass")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n username"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"admin"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("to_string")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n password"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"password"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("to_string")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Set RPC url")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("mut")]),t._v(" rpc_url "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"http://"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("to_string")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n rpc_url"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("push_str")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"127.0.0.1:18443"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Setup the RPC configuration")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" rpc_config "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("RpcConfig")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n url"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" rpc_url"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n auth"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n network"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Network")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Regtest")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n wallet_name"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n skip_blocks"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Use the above configuration to create a RPC blockchain backend")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" blockchain "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("RpcBlockchain")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("from_config")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("rpc_config"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Combine everything and finally create the BDK wallet structure")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" wallet "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Wallet")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("new")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("receive_desc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Some")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("change_desc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Network")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Regtest")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" db_tree"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" blockchain"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Sync the wallet")]),t._v("\n wallet"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("NoopProgress")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Fetch a fresh address to receive coins")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" address "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" wallet"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("get_address")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("AddressIndex")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("New")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("address"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Send 10 BTC from Core to BDK")]),t._v("\n core_rpc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("send_to_address")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("address"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Amount")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("from_btc")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("10.0")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token 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punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Create a transaction builder")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("mut")]),t._v(" tx_builder "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" wallet"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("build_tx")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Set recipient of the transaction")]),t._v("\n tx_builder"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("set_recipients")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token macro property"}},[t._v("vec!")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("core_address"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("script_pubkey")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("500000000")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token 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punctuation"}},[t._v("..")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Default")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("default")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Sign the above psbt with signing option")]),t._v("\n wallet"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("sign")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("mut")]),t._v(" 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punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Broadcast the transaction")]),t._v("\n wallet"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("broadcast")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("tx"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Confirm transaction by generating some blocks")]),t._v("\n core_rpc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("generate_to_address")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("1")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("core_address"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Sync the BDK wallet")]),t._v("\n wallet"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("NoopProgress")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Fetch and display wallet balances")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" core_balance "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" 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This is just tip of the iceberg of BDK capabilities. BDK allows flexibility in all the dimensions of a bitcoin wallet, that is key chain, blockchain backend and database management. With all that power, we just implemented a trustless, non-custodial, private bitcoin wallet, backed by a bitcoin full node, with less than 200 lines of code (including lots of comments).")]),t._v(" "),s("p",[t._v("BDK thus allows wallet devs, to only focus on stuff that they care about, writing wallet logic. 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to add our wallet code.")]),t._v(" "),s("h2",{attrs:{id:"getting-descriptors"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#getting-descriptors"}},[t._v("#")]),t._v(" Getting Descriptors")]),t._v(" "),s("p",[t._v("BDK is a descriptor based wallet library. That means when we specify our wallet key-chain we need to tell BDK about it in the format of a descriptor. You can read up on descriptors more "),s("a",{attrs:{href:"https://bitcoindevkit.org/descriptors/",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),s("OutboundLink")],1),t._v(". A descriptor string looks like this\n"),s("code",[t._v("\"wpkh([b8b575c2/84'/1'/0'/0]tprv8icWtRzy9CWgFxpGMLSdAeE4wWyz39XGc6SwykeTo13tYm14JkVVQAf7jz8WDDarCgNJrG3aEPJEqchDWeJdiaWpS3FwbLB9SzsN57V7qxB/*)\"")]),t._v(".")]),t._v(" "),s("p",[t._v("This describes a SegwitV0 descriptor of a key derived at path "),s("code",[t._v("m/84'/1'/0'/0")]),t._v(". If you already have a descriptor from other sources, you can use that. Otherwise, BDK has your back. BDK can be used to generate a fresh master key with mnemonic, and then derive child keys from it given a specific path. Putting the key in a descriptor is as simple as wrapping it with a "),s("code",[t._v("wpkh()")]),t._v(" string.")]),t._v(" "),s("p",[t._v("We will use a dedicated function that will create fresh receive and change descriptors from BDK for our purpose. It will also generate the mnemonic word list for later regenerating the wallet. But we will ignore that for our scope.")]),t._v(" "),s("p",[t._v("Add a function named "),s("code",[t._v("get-descriptor()")]),t._v(" below the "),s("code",[t._v("main()")]),t._v(" function as shown")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fn")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function-definition function"}},[t._v("main")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("...")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// generate fresh descriptor strings and return them via (receive, change) 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class-name"}},[t._v("String")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("String")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("...")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("p",[t._v("Running the binary should produce the following result")]),t._v(" "),s("div",{staticClass:"language-shell extra-class"},[s("pre",{pre:!0,attrs:{class:"language-shell"}},[s("code",[t._v("$ "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("cargo")]),t._v(" run\nrecv: "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v("\"wpkh([89df6a67/84'/1'/0'/0]tprv8iSRXyLtTKJN9qt1jyPVqwhDMEaYztXunPaRQznaH1z8gj8e2g7RnF2ZoHP56VEXwMn76AiV1Je6nJmZbFistwAQCrRGmSrsoKfdqfTDNA1/*)\"")]),t._v(", \nchng: "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v("\"wpkh([89df6a67/84'/1'/0'/1]tprv8iSRXyLtTKJNCECQxBJ19cgx2ueS7mC7GNq7VqTWY3RNPMBY7DfTb9HUnXpJqa14jCJNRmi4yGxfoTVS4WLBXDkvTLq4vujeAD9NfDtSxGP/*)\"")]),t._v("\n")])])]),s("p",[t._v("Voila! Now we have nice descriptors strings handy to use for our BDK wallet construction.")]),t._v(" "),s("h2",{attrs:{id:"talking-to-bitcoin-core-programmatically"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#talking-to-bitcoin-core-programmatically"}},[t._v("#")]),t._v(" Talking to Bitcoin Core Programmatically")]),t._v(" "),s("p",[t._v("Like all other tutorials we will use two wallets to send coins back and forth. A Bitcoin Core wallet accessible via "),s("code",[t._v("bitcoin-cli")]),t._v(" command line tools, and a BDK wallet maintained by BDK library.")]),t._v(" "),s("p",[t._v("But unlike other tutorials, we won't be using "),s("code",[t._v("bitcoin-cli")]),t._v(" to talk to the Core wallet (we can, but let's spice things up). Instead, we will use the "),s("code",[t._v("bitcoin-rpc")]),t._v(" library, to talk with our core node listening at "),s("code",[t._v("127.0.0.1:18443")]),t._v(", from inside our main function. This will allow us to write code, that will handle both the core and BDK wallet, from inside of the same function, and we won't have to switch terminals!")]),t._v(" "),s("p",[t._v("Remember we imported "),s("code",[t._v("use bdk::bitcoincore_rpc::{Auth as rpc_auth, Client, RpcApi};")]),t._v("? Thats exactly for this purpose.")]),t._v(" "),s("p",[t._v("Start the "),s("code",[t._v("bitcoind")]),t._v(" node.")]),t._v(" "),s("p",[t._v("you should see bitcoind listening at port 18443")]),t._v(" "),s("div",{staticClass:"language-shell extra-class"},[s("pre",{pre:!0,attrs:{class:"language-shell"}},[s("code",[t._v("$ "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("sudo")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("netstat")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-nptl")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("grep")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("18443")]),t._v(" \ntcp "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0.0")]),t._v(".0.0:18443 "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0.0")]),t._v(".0.0:* LISTEN "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("135532")]),t._v("/bitcoind \n")])])]),s("p",[t._v("Lets create a core rpc interface in our main function.")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fn")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function-definition function"}},[t._v("main")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("...")]),t._v("\n \n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Create a RPC interface")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" rpc_auth "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("rpc_auth"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("UserPass")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"admin"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("to_string")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"password"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("to_string")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v(" \n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" core_rpc "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Client")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("new")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"http://127.0.0.1:18443/wallet/test"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("to_string")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" rpc_auth"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token macro property"}},[t._v("println!")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"{:#?}"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" core_rpc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("get_blockchain_info")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("p",[t._v("We have provided our RPC authentication "),s("code",[t._v("username")]),t._v(" and "),s("code",[t._v("password")]),t._v(" (same as provided in "),s("code",[t._v("bitcoin.conf")]),t._v(" file).\nWe have provided the RPC address of our local bitcoin node, with the path to a wallet file, named "),s("code",[t._v("test")]),t._v(". And then asked the rpc client to give us the current blockchain info.\nIf everything goes well, running "),s("code",[t._v("cargo run")]),t._v(" you should see an output like below:")]),t._v(" "),s("div",{staticClass:"language-shell extra-class"},[s("pre",{pre:!0,attrs:{class:"language-shell"}},[s("code",[t._v("$ "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("cargo")]),t._v(" run\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("..")]),t._v(".\nGetBlockchainInfoResult "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n chain: "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"regtest"')]),t._v(",\n blocks: "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),t._v(",\n headers: "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),t._v(",\n best_block_hash: 0f9188f13cb7b2c71f2a335e3a4fc328bf5beb436012afca590b1a11466e2206,\n difficulty: "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0.00000000046565423739069247")]),t._v(",\n median_time: "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("1296688602")]),t._v(",\n verification_progress: "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("1.0")]),t._v(",\n initial_block_download: true,\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("..")]),t._v(".\n")])])]),s("p",[t._v("Thats it. Now we can programmatically talk to our core node.")]),t._v(" "),s("h2",{attrs:{id:"get-some-balance-in-core-wallet"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#get-some-balance-in-core-wallet"}},[t._v("#")]),t._v(" Get some balance in core wallet.")]),t._v(" "),s("p",[t._v("We have told our rpc client that we would use a wallet named "),s("code",[t._v("test")]),t._v(". But currently, our core node doesn't have such a wallet. So let's create the wallet and fund it with some test coins.")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fn")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function-definition function"}},[t._v("main")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("...")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Create the test wallet ")]),t._v("\n core_rpc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("create_wallet")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"test"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n \n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Get a new address")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" core_address "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" core_rpc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("get_new_address")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n \n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Generate 101 blocks and use the above address as coinbase")]),t._v("\n core_rpc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("generate_to_address")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("101")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("core_address"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n \n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// fetch the new balance")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" core_balance "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" core_rpc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("get_balance")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n \n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Show balance")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token macro property"}},[t._v("println!")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"core balance: {:#?}"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" core_balance"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("p",[t._v("This will create a wallet in bitcoin core named "),s("code",[t._v("test")]),t._v(". generate 101 blocks and use a new address from the wallet as coinbase wallet. Because required coinbase maturity in bitcoin is 100 blocks, by generating 101 blocks, we will have the balance of the first coinbase block reward available for use.\nThe last "),s("code",[t._v("println!()")]),t._v(" statement will show the new updated balance as 50 BTC.")]),t._v(" "),s("div",{staticClass:"language-shell extra-class"},[s("pre",{pre:!0,attrs:{class:"language-shell"}},[s("code",[t._v("$ "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("cargo")]),t._v(" run\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("..")]),t._v(".\ncore balance: Amount"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("50.00000000")]),t._v(" BTC"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" \n")])])]),s("p",[t._v("Great! We now have 50 regtest BTC to play with.")]),t._v(" "),s("h2",{attrs:{id:"setup-the-bdk-wallet"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#setup-the-bdk-wallet"}},[t._v("#")]),t._v(" Setup the BDK wallet")]),t._v(" "),s("p",[t._v("Now that we are done setting up the core wallet. The last remaining step is to setup the BDK wallet. For this we will use the previous descriptor generation function and write code as below.")]),t._v(" "),s("p",[s("strong",[t._v("Note")]),t._v(": You might want to comment out the previous code in "),s("code",[t._v("main()")]),t._v(", as running them again will create more coins in core, which isn't an issue, but might be confusing.")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fn")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function-definition function"}},[t._v("main")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("...")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Get receive and change 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wallet_name"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n skip_blocks"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Use the above configuration to create a RPC blockchain backend")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" blockchain "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("RpcBlockchain")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token 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punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("p",[t._v("That's a lot of code. They are divided into logical sections. Let's discuss each step one by one.")]),t._v(" "),s("ul",[s("li",[t._v("First we used our previous "),s("code",[t._v("get_descriptors()")]),t._v(" function to generate two descriptor strings. One for generating receive addresses and one for change addresses.")]),t._v(" "),s("li",[t._v("Then we used a special function from BDK called "),s("code",[t._v("wallet_name_from_descriptor()")]),t._v(" to derive a name of the wallet from our descriptors. This allows us to have wallet names deterministically linked with descriptors. So in future if we use a different descriptor, the wallet will automatically have a different name. This allows us to not mix wallet names with same descriptor, and given the descriptors we can always determine what was the name we used. It is recommended to derive wallet names like this while using a core backend. Note that this wallet will be created inside the core node. So just like we accessed the "),s("code",[t._v("test")]),t._v(" wallet, we could also access this wallet.")]),t._v(" "),s("li",[t._v("Then we created a data directory at path "),s("code",[t._v("/home/username/.bdk-example")]),t._v(". We use "),s("code",[t._v("dirs_next")]),t._v(" to find our home path, and then appended that with "),s("code",[t._v(".bdk-example")]),t._v(". All the BDK wallet files will be created and maintained in that directory. In the Database we instructed BDK to create a new "),s("code",[t._v("Tree")]),t._v(" with "),s("code",[t._v("wallet_name")]),t._v(", so given a descriptor, BDK will always know which DB Tree to refer ("),s("code",[t._v("Tree")]),t._v(" is a "),s("code",[t._v("sled")]),t._v(" specific term).")]),t._v(" "),s("li",[t._v("Then like we did previously, we created the rpc username/password authentication, and specified the rpc url. Note that we cannot use the same "),s("code",[t._v("rpc_auth")]),t._v(" we used before for "),s("code",[t._v("core_rpc")]),t._v(" as BDK auth and bitcoin-rpc auth are slightly separate structures.")]),t._v(" "),s("li",[t._v("We combined all this information and created an "),s("code",[t._v("RpcConfig")]),t._v(" structure.")]),t._v(" "),s("li",[t._v("We used the rpc configuration to create a "),s("code",[t._v("RpcBlockchain")]),t._v(" structure.")]),t._v(" "),s("li",[t._v("Finally we used the Descriptors, Database, and Blockchain to create our final BDK "),s("code",[t._v("wallet")]),t._v(" structure.")])]),t._v(" "),s("p",[t._v("Now that we have our wallet cooked, in the end, we instructed it to sync with the bitcoin core backend, and fetch us a new address.")]),t._v(" "),s("p",[t._v("If all goes well, you should see an address printed in the terminal.")]),t._v(" "),s("div",{staticClass:"language-shell extra-class"},[s("pre",{pre:!0,attrs:{class:"language-shell"}},[s("code",[s("span",{pre:!0,attrs:{class:"token function"}},[t._v("cargo")]),t._v(" run\n Finished dev "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("unoptimized + debuginfo"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" target"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("s"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("in")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("2")]),t._v(".99s\n Running "),s("span",{pre:!0,attrs:{class:"token variable"}},[s("span",{pre:!0,attrs:{class:"token variable"}},[t._v("`")]),t._v("target/debug/bdk-example"),s("span",{pre:!0,attrs:{class:"token variable"}},[t._v("`")])]),t._v("\nbdk address: bcrt1q9vkmujggvzs0rd4z6069v3v0jucje7ua7ap308\n")])])]),s("h2",{attrs:{id:"sending-sats-around"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#sending-sats-around"}},[t._v("#")]),t._v(" Sending Sats Around")]),t._v(" "),s("p",[t._v("Now that we have covered all the groundwork, we have all we need to send coins back and forth between core and BDK wallet.")]),t._v(" "),s("p",[t._v("We will keep things simple here and make the following actions")]),t._v(" "),s("ul",[s("li",[t._v("Send 10 BTC from Core to BDK")]),t._v(" "),s("li",[t._v("Send back 5 BTC from BDK to Core")]),t._v(" "),s("li",[t._v("Display balance of two wallets")])]),t._v(" "),s("p",[t._v("In the last line of previous section we got a new address from BDK wallet. We will start from there. Without further discussion lets jump straight into code.")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fn")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function-definition function"}},[t._v("main")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("...")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Fetch a fresh address to receive coins")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" address "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" wallet"),s("span",{pre:!0,attrs:{class:"token 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The only new thing added is "),s("code",[t._v("wallet.build_tx()")]),t._v(" which returns a "),s("code",[t._v("TxBuilder")]),t._v(". BDK allows us to have very fine grained control of cooking up transactions. Almost everything that is possible to do with a Bitcoin transaction can be done in BDK. Here we have a very simple vanilla transaction with no added magic. To get full list of capabilities that "),s("code",[t._v("TxBuilder")]),t._v(" supports scour its implementation "),s("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/blob/38d1d0b0e29d38cd370c740d798d96a3c9fcaa1f/src/wallet/tx_builder.rs#L123-L153",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),s("OutboundLink")],1),t._v(".")]),t._v(" "),s("p",[t._v("Finally to step through what we did above:")]),t._v(" "),s("ul",[s("li",[t._v("We asked core wallet to send 10 BTC to bdk wallet address.")]),t._v(" "),s("li",[t._v("We confirmed the transaction, and synced the wallet.")]),t._v(" "),s("li",[t._v("We asked BDK to create a transaction sending 5 BTC to core wallet address.")]),t._v(" "),s("li",[t._v("We signed and broadcast the transaction. BDK will use the same core node to broadcast the transaction to network.")]),t._v(" "),s("li",[t._v("We confirmed the transaction by mining a block, and synced the wallet.")]),t._v(" "),s("li",[t._v("We fetched and displayed balance of both core and BDK wallet.")])]),t._v(" "),s("p",[t._v("If all goes well, you should see the final updated balance as below:")]),t._v(" "),s("div",{staticClass:"language-shell extra-class"},[s("pre",{pre:!0,attrs:{class:"language-shell"}},[s("code",[t._v("$ "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("cargo")]),t._v(" run\n Compiling bdk-example v0.1.0 "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("/home/raj/github-repo/bdk-example/bdk-example"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n Finished dev "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("unoptimized + debuginfo"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" target"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("s"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("in")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("3")]),t._v(".57s\n Running "),s("span",{pre:!0,attrs:{class:"token variable"}},[s("span",{pre:!0,attrs:{class:"token variable"}},[t._v("`")]),t._v("target/debug/bdk-example"),s("span",{pre:!0,attrs:{class:"token variable"}},[t._v("`")])]),t._v("\ncore wallet balance: Amount"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("144.99998590")]),t._v(" BTC"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\nBDK wallet balance: Amount"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("4.99999859")]),t._v(" BTC"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),s("p",[t._v("Voila! We have ~145 BTC (150 - 5) in core wallet and 5 BTC (10 - 5) in BDK wallet. The slight deficiency in the amount are due to transaction fees. Because we are using regtest, the fee is some standard value hardcoded in core node.")]),t._v(" "),s("p",[t._v("Check out the data directory where BDK has created the wallet data files.")]),t._v(" "),s("div",{staticClass:"language-shell extra-class"},[s("pre",{pre:!0,attrs:{class:"language-shell"}},[s("code",[t._v("$ "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("ls")]),t._v(" ~/.bdk-example/\nblobs conf db snap.0000000000023CAB\n")])])]),s("p",[t._v("And finally, this is what the final "),s("code",[t._v("main.rs")]),t._v(" file looks like.")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("use")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("bdk"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),t._v("bitcoin"),s("span",{pre:!0,attrs:{class:"token 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punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("UserPass")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"admin"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("to_string")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"password"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("to_string")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v(" \n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" core_rpc "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Client")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("new")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"http://127.0.0.1:18443/wallet/test"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("to_string")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" rpc_auth"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Create the test wallet ")]),t._v("\n core_rpc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("create_wallet")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"test"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n \n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Get a new address")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" core_address "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" core_rpc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("get_new_address")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n \n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Generate 101 blocks and use the above address as coinbase")]),t._v("\n core_rpc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("generate_to_address")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("101")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("core_address"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Get receive and change descriptor")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("receive_desc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" change_desc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("get_descriptors")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n \n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Use deterministic wallet name derived from descriptor")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" wallet_name "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("wallet_name_from_descriptor")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("receive_desc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Some")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("change_desc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Network")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Regtest")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Secp256k1")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("new")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Create the datadir to store wallet data")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("mut")]),t._v(" datadir "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("dirs_next"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("home_dir")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n datadir"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("push")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('".bdk-example"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" database "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("sled"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("open")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("datadir"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" db_tree "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" database"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("open_tree")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("wallet_name"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("clone")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Set RPC username and password")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" auth "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Auth")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("UserPass")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n username"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"admin"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("to_string")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n password"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"password"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("to_string")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Set RPC url")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("mut")]),t._v(" rpc_url "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"http://"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("to_string")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n rpc_url"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("push_str")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"127.0.0.1:18443"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Setup the RPC configuration")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" rpc_config "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("RpcConfig")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n url"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" rpc_url"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n auth"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n network"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Network")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Regtest")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n wallet_name"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n skip_blocks"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Use the above configuration to create a RPC blockchain backend")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" blockchain "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("RpcBlockchain")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("from_config")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("rpc_config"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Combine everything and finally create the BDK wallet structure")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" wallet "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Wallet")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("new")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("receive_desc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Some")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("change_desc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Network")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Regtest")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" db_tree"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" blockchain"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Sync the wallet")]),t._v("\n wallet"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("NoopProgress")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Fetch a fresh address to receive coins")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" address "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" wallet"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("get_address")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("AddressIndex")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("New")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("address"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Send 10 BTC from Core to BDK")]),t._v("\n core_rpc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("send_to_address")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("address"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Amount")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("from_btc")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("10.0")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token 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punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Create a transaction builder")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("mut")]),t._v(" tx_builder "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" wallet"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("build_tx")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Set recipient of the transaction")]),t._v("\n tx_builder"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("set_recipients")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token macro property"}},[t._v("vec!")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("core_address"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("script_pubkey")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("500000000")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token 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punctuation"}},[t._v("..")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Default")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("default")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Sign the above psbt with signing option")]),t._v("\n wallet"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("sign")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("mut")]),t._v(" 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punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Broadcast the transaction")]),t._v("\n wallet"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("broadcast")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("tx"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Confirm transaction by generating some blocks")]),t._v("\n core_rpc"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("generate_to_address")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("1")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("core_address"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Sync the BDK wallet")]),t._v("\n wallet"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("NoopProgress")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("None")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("unwrap")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Fetch and display wallet balances")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" core_balance "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" 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punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("clone")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("h2",{attrs:{id:"conclusion"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#conclusion"}},[t._v("#")]),t._v(" Conclusion")]),t._v(" "),s("p",[t._v("In this tutorial we saw some very basic BDK wallet functionality with a bitcoin core backend as the source and sync of blockchain data. This is just tip of the iceberg of BDK capabilities. BDK allows flexibility in all the dimensions of a bitcoin wallet, that is key chain, blockchain backend and database management. With all that power, we just implemented a trustless, non-custodial, private bitcoin wallet, backed by a bitcoin full node, with less than 200 lines of code (including lots of comments).")]),t._v(" "),s("p",[t._v("BDK thus allows wallet devs, to only focus on stuff that they care about, writing wallet logic. All the backend stuff like blockchain, key management, and databases are abstracted away under the hood.")]),t._v(" "),s("p",[t._v("To find and explore more about the BDK capabilities and how it can fit your development need refer the following resources.")]),t._v(" "),s("ul",[s("li",[s("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk",target:"_blank",rel:"noopener noreferrer"}},[t._v("source code"),s("OutboundLink")],1)]),t._v(" "),s("li",[s("a",{attrs:{href:"https://docs.rs/bdk/latest/bdk/",target:"_blank",rel:"noopener noreferrer"}},[t._v("dev docs"),s("OutboundLink")],1)]),t._v(" "),s("li",[s("a",{attrs:{href:"https://discord.com/invite/d7NkDKm",target:"_blank",rel:"noopener noreferrer"}},[t._v("community"),s("OutboundLink")],1)])])])}),[],!1,null,null,null);s.default=e.exports}}]); \ No newline at end of file diff --git a/assets/js/40.3a3417fd.js b/assets/js/40.40d30668.js similarity index 99% rename from assets/js/40.3a3417fd.js rename to assets/js/40.40d30668.js index e21c325a26..9e2c066643 100644 --- a/assets/js/40.3a3417fd.js +++ b/assets/js/40.40d30668.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[40],{389:function(t,e,s){"use strict";s.r(e);var a=s(7),r=Object(a.a)({},(function(){var t=this,e=t._self._c;return e("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[e("h2",{attrs:{id:"2-of-3-multi-signature-descriptor-wallet-using-bdk-cli"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#2-of-3-multi-signature-descriptor-wallet-using-bdk-cli"}},[t._v("#")]),t._v(" 2-of-3 Multi-Signature Descriptor Wallet using bdk-cli")]),t._v(" "),e("h2",{attrs:{id:"overview-of-the-tutorial"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#overview-of-the-tutorial"}},[t._v("#")]),t._v(" Overview of the tutorial")]),t._v(" "),e("ul",[e("li",[t._v("The purpose of this tutorial is to continue learning "),e("code",[t._v("bdk-cli")]),t._v(" as our tool to manage a 2 of 3 multi-signature wallet.")]),t._v(" "),e("li",[t._v("Generate a receive address with a spending Policy of 2 out of 3 escrow aka multi-signature.")]),t._v(" "),e("li",[t._v("Intro to more complex but standard policies to create custom encumberances aka custom spending conditions for transactions.")])]),t._v(" "),e("p",[t._v("Note that to complete this tutorial, you'll need to enable the "),e("code",[t._v("compiler")]),t._v(" and "),e("code",[t._v("electrum")]),t._v(" flags when installing or building bdk-cli, for example by installing using:")]),t._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[e("span",{pre:!0,attrs:{class:"token function"}},[t._v("cargo")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("install")]),t._v(" bdk-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--features")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("compiler,electrum\n")])])]),e("h2",{attrs:{id:"step-1-generate-the-xprvs-extended-keys-and-save-to-environment-variables"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-1-generate-the-xprvs-extended-keys-and-save-to-environment-variables"}},[t._v("#")]),t._v(" Step 1: Generate the XPRVs (Extended-Keys) and Save to environment variables")]),t._v(" "),e("blockquote",[e("p",[t._v("Create three private keys and each in their own environment variable")])]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("export XPRV_00=$(bdk-cli key generate | jq -r '.xprv')")])]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("export XPRV_01=$(bdk-cli key generate | jq -r '.xprv')")])]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("export XPRV_02=$(bdk-cli key generate | jq -r '.xprv')")])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/FwgUdwK.gif",alt:""}})]),t._v(" "),e("h3",{attrs:{id:"1a-verify-xprv-environment-variables-are-active"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#1a-verify-xprv-environment-variables-are-active"}},[t._v("#")]),t._v(" 1a: Verify XPRV environment variables are Active")]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("env | grep XPRV")])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/ZerGPbO.gif",alt:""}})]),t._v(" "),e("h2",{attrs:{id:"step-2-generate-xpubs-extended-public-keys-save-to-environment-variables"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-2-generate-xpubs-extended-public-keys-save-to-environment-variables"}},[t._v("#")]),t._v(" Step 2: Generate XPUBs (Extended Public Keys) & Save to environment variables")]),t._v(" "),e("blockquote",[e("p",[t._v("Generate the three individual Public Keys aka XPUBs using our Private key and descriptor path.")])]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v('export XPUB_00=$(bdk-cli key derive --xprv $XPRV_00 --path "m/84\'/1\'/0\'/0" | 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Single-Wallet Descriptors")]),t._v(" "),e("blockquote",[e("p",[t._v("Create the wallet Descriptor for each wallet")])]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v('export DESCRIPTOR_00="$XPRV_00/84h/1h/0h/0/*"')])]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v('export DESCRIPTOR_01="$XPRV_01/84h/1h/0h/0/*"')])]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v('export DESCRIPTOR_02="$XPRV_02/84h/1h/0h/0/*"')])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/mFrWt6b.png",alt:""}})]),t._v(" "),e("h2",{attrs:{id:"step-4-create-multi-sig-descriptor-wallets"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-4-create-multi-sig-descriptor-wallets"}},[t._v("#")]),t._v(" Step 4: Create Multi-Sig-Descriptor Wallets")]),t._v(" "),e("blockquote",[e("p",[t._v("This is how you create the 2-of-3 multi-sig output descriptor. You will need (one PrivateKey and two Xpubs) It consists of using the "),e("code",[t._v("compiler")]),t._v(" function to parse "),e("code",[t._v("policy")]),t._v(" to "),e("code",[t._v("mini-script")]),t._v(" .")])]),t._v(" "),e("ul",[e("li",[t._v("When creating the descriptor the order matters so be aware of that when following tutorial if you are for any reason changing the order of the policy.")])]),t._v(" "),e("h4",{attrs:{id:"multi-sig-wallet-0"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#multi-sig-wallet-0"}},[t._v("#")]),t._v(" Multi-Sig-Wallet 0")]),t._v(" "),e("ul",[e("li",[t._v("[ ] ▶️ "),e("code",[t._v("export MULTI_DESCRIPTOR_00=$(bdk-cli compile \"thresh(2,pk($DESCRIPTOR_00),pk($XPUB_01),pk($XPUB_02))\" | jq -r '.descriptor')")])])]),t._v(" "),e("h4",{attrs:{id:"multi-sig-wallet-1"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#multi-sig-wallet-1"}},[t._v("#")]),t._v(" Multi-Sig-Wallet 1")]),t._v(" "),e("ul",[e("li",[t._v("[ ] ▶️ "),e("code",[t._v("export MULTI_DESCRIPTOR_01=$(bdk-cli compile \"thresh(2,pk($XPUB_00),pk($DESCRIPTOR_01),pk($XPUB_02))\" | jq -r '.descriptor')")])])]),t._v(" "),e("h4",{attrs:{id:"multi-sig-wallet-2"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#multi-sig-wallet-2"}},[t._v("#")]),t._v(" Multi-Sig-Wallet 2")]),t._v(" "),e("ul",[e("li",[t._v("[ ] ▶️ "),e("code",[t._v("export MULTI_DESCRIPTOR_02=$(bdk-cli compile \"thresh(2,pk($XPUB_00),pk($XPUB_01),pk($DESCRIPTOR_02))\" | jq -r '.descriptor')")])])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/Yb8RmFS.gif",alt:""}})]),t._v(" "),e("h4",{attrs:{id:"multi-sig-2-of-3-policy-gets-compiled-to-miniscript"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#multi-sig-2-of-3-policy-gets-compiled-to-miniscript"}},[t._v("#")]),t._v(" multi-sig 2 of 3 policy gets compiled to miniscript")]),t._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# policy")]),t._v("\nthresh"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("2")]),t._v(",pk"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("XPRV_A"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(",pk"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("XPUB_B"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(",pk"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("XPUB_C"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("))")]),t._v(" \n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# miniscript")]),t._v("\nwsh"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("multi"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("2")]),t._v(",XPRV_KEY,PUBKEY_B,XPUB_C"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("))")]),t._v("\n")])])]),e("hr"),t._v(" "),e("h3",{attrs:{id:"4a-verify-multi-sig-descriptor-environment-variables-are-active"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#4a-verify-multi-sig-descriptor-environment-variables-are-active"}},[t._v("#")]),t._v(" 4a: Verify Multi-Sig-Descriptor environment variables are active")]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("env | grep MULTI")])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/aAgtlsi.gif",alt:""}})]),t._v(" "),e("hr"),t._v(" "),e("h2",{attrs:{id:"step-5-generate-receive-address-by-using-multi-sig-descriptor-wallets"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-5-generate-receive-address-by-using-multi-sig-descriptor-wallets"}},[t._v("#")]),t._v(" Step 5: Generate Receive Address by using Multi-Sig-Descriptor Wallets")]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("bdk-cli wallet --wallet wallet_name_msd00 --descriptor $MULTI_DESCRIPTOR_00 get_new_address")])]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("bdk-cli wallet --wallet wallet_name_msd01 --descriptor $MULTI_DESCRIPTOR_01 get_new_address")])]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("bdk-cli wallet --wallet wallet_name_msd02 --descriptor $MULTI_DESCRIPTOR_02 get_new_address")])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/w1fxPSn.gif",alt:""}})]),t._v(" "),e("p",[t._v("🔴 Did you generate the same address for all three? Good! Else, something might be incorrect.")]),t._v(" "),e("h2",{attrs:{id:"step-6-send-testnet-bitcoin-to-the-newly-created-receive-address"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-6-send-testnet-bitcoin-to-the-newly-created-receive-address"}},[t._v("#")]),t._v(" Step 6: Send Testnet Bitcoin to the newly created receive-address")]),t._v(" "),e("p",[e("a",{attrs:{href:"https://testnet-faucet.mempool.co",target:"_blank",rel:"noopener noreferrer"}},[t._v("Bitcoin Testnet Faucet link:1"),e("OutboundLink")],1),t._v(" "),e("a",{attrs:{href:"https://bitcoinfaucet.uo1.net",target:"_blank",rel:"noopener noreferrer"}},[t._v("Bitcoin Testnet Faucet link:2"),e("OutboundLink")],1)]),t._v(" "),e("h2",{attrs:{id:"step-7-sync-one-of-the-multi-sig-wallets"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-7-sync-one-of-the-multi-sig-wallets"}},[t._v("#")]),t._v(" Step 7: Sync one of the Multi-Sig Wallets")]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("bdk-cli wallet --wallet wallet_name_msd00 --descriptor $MULTI_DESCRIPTOR_00 sync")])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/GuefgeI.gif",alt:""}})]),t._v(" "),e("h2",{attrs:{id:"step-8-check-balance-multi-sig-wallets"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-8-check-balance-multi-sig-wallets"}},[t._v("#")]),t._v(" Step 8: Check Balance Multi-Sig Wallets")]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("bdk-cli wallet --wallet wallet_name_msd00 --descriptor $MULTI_DESCRIPTOR_00 get_balance")])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/zNciCqF.gif",alt:""}})]),t._v(" "),e("ul",[e("li",[t._v("Every wallet has access to sync and view balance.")])]),t._v(" "),e("h2",{attrs:{id:"step-9-check-multi-sig-policies-on-descriptor-wallet"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-9-check-multi-sig-policies-on-descriptor-wallet"}},[t._v("#")]),t._v(" Step 9: Check Multi-Sig Policies on Descriptor Wallet")]),t._v(" "),e("p",[t._v("▶️"),e("code",[t._v("bdk-cli wallet --wallet wallet_name_msd00 --descriptor $MULTI_DESCRIPTOR_00 policies")])]),t._v(" "),e("p",[t._v("The output below confirms the command was successful.")]),t._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"external"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"contribution"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"conditions"')]),e("span",{pre:!0,attrs:{class:"token builtin 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punctuation"}},[t._v("}")]),t._v("\n\n\n")])])]),e("h3",{attrs:{id:"spendingpolicyrequired-for-complex-descriptors"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#spendingpolicyrequired-for-complex-descriptors"}},[t._v("#")]),t._v(" SpendingPolicyRequired for complex descriptors")]),t._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--external_policy")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"{'),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v("seaxtqqn"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v(': [0,1]}"')]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),t._v("-rootnode-"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(">")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),t._v("children "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("#0 and #1 of root node>")]),t._v("\n")])])]),e("blockquote",[e("p",[t._v("Save the \"id\": We will need to use this ''id'' later.")])]),t._v(" "),e("p",[t._v("More info on "),e("a",{attrs:{href:"https://bitcoindevkit.org/bdk-cli/interface/",target:"_blank",rel:"noopener noreferrer"}},[t._v("external policies here"),e("OutboundLink")],1)]),t._v(" "),e("h2",{attrs:{id:"step-10-create-a-transaction-psbt"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-10-create-a-transaction-psbt"}},[t._v("#")]),t._v(" Step 10: Create a Transaction (PSBT)")]),t._v(" "),e("ul",[e("li",[t._v("1st Create a PSBT using the first wallet")]),t._v(" "),e("li",[t._v("2nd Sign the PSBT with the first wallet")]),t._v(" "),e("li",[t._v("3rd Sign PSBT with the second wallet")]),t._v(" "),e("li",[t._v("Broadcast PSBT")])]),t._v(" "),e("h3",{attrs:{id:"export-unsigned-psbt-to-environment-variable"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#export-unsigned-psbt-to-environment-variable"}},[t._v("#")]),t._v(" Export UNSIGNED_PSBT to environment variable")]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v('export UNSIGNED_PSBT=$(bdk-cli wallet --wallet wallet_name_msd00 --descriptor $MULTI_DESCRIPTOR_00 create_tx --send_all --to mkHS9ne12qx9pS9VojpwU5xtRd4T7X7ZUt:0 --external_policy "{\\"CHANGE_ID_HERE\\": [0,1]}" | jq -r \'.psbt\')')])]),t._v(" "),e("h3",{attrs:{id:"verify-unsigned-psbt-environment-variable"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#verify-unsigned-psbt-environment-variable"}},[t._v("#")]),t._v(" Verify UNSIGNED_PSBT environment variable")]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("env | grep UNSIGNED")]),t._v(" "),e("img",{attrs:{src:"https://i.imgur.com/djHaRDq.gif",alt:""}})]),t._v(" "),e("h2",{attrs:{id:"step-11-sign-the-transaction"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-11-sign-the-transaction"}},[t._v("#")]),t._v(" Step 11: SIGN the Transaction")]),t._v(" "),e("h3",{attrs:{id:"1st-wallet-signs-the-transaction"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#1st-wallet-signs-the-transaction"}},[t._v("#")]),t._v(" 1st Wallet Signs the transaction")]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("bdk-cli wallet --wallet wallet_name_msd00 --descriptor $MULTI_DESCRIPTOR_00 sign --psbt $UNSIGNED_PSBT")])]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("export ONESIG_PSBT=$(bdk-cli wallet --wallet wallet_name_msd00 --descriptor $MULTI_DESCRIPTOR_00 sign --psbt $UNSIGNED_PSBT | jq -r '.psbt')")])]),t._v(" "),e("p",[t._v("▶️"),e("code",[t._v("env | grep ONESIG")])]),t._v(" "),e("div",{staticClass:"language- extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v('{\n "is_finalized": false,\n "psbt": 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"),e("h3",{attrs:{id:"2nd-wallet-signs-the-transaction"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#2nd-wallet-signs-the-transaction"}},[t._v("#")]),t._v(" 2nd Wallet Signs the transaction")]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("bdk-cli wallet --wallet wallet_name_msd01 --descriptor $MULTI_DESCRIPTOR_01 sign --psbt $ONESIG_PSBT")])]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("export SECONDSIG_PSBT=$(bdk-cli wallet --wallet wallet_name_msd01 --descriptor $MULTI_DESCRIPTOR_01 sign --psbt $ONESIG_PSBT | jq -r '.psbt')")])]),t._v(" "),e("p",[t._v("▶️"),e("code",[t._v("env | grep SECONDSIG")])]),t._v(" "),e("div",{staticClass:"language- extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v('{\n "is_finalized": true,\n "psbt": 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"),e("h2",{attrs:{id:"step-12-broadcast-transaction"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-12-broadcast-transaction"}},[t._v("#")]),t._v(" Step 12: Broadcast Transaction")]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("bdk-cli wallet --wallet wallet_name_msd01 --descriptor $MULTI_DESCRIPTOR_01 broadcast --psbt $SECONDSIG_PSBT")])]),t._v(" "),e("div",{staticClass:"language- extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v('{\n "txid": "61da2451874a483aa8d1d0787c7680d157639f284840de8885098cac43f6cc2f"\n}\n')])])]),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/M7s0Fd6.gif",alt:""}})]),t._v(" "),e("h3",{attrs:{id:"verify-transaction"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#verify-transaction"}},[t._v("#")]),t._v(" Verify Transaction")]),t._v(" "),e("p",[t._v("Verify transcation in the memory pool on testnet "),e("a",{attrs:{href:"https://mempool.space/testnet",target:"_blank",rel:"noopener noreferrer"}},[t._v("Mempool-testnet!"),e("OutboundLink")],1)])])}),[],!1,null,null,null);e.default=r.exports}}]); \ No newline at end of file +(window.webpackJsonp=window.webpackJsonp||[]).push([[40],{385:function(t,e,s){"use strict";s.r(e);var a=s(7),r=Object(a.a)({},(function(){var t=this,e=t._self._c;return e("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[e("h2",{attrs:{id:"2-of-3-multi-signature-descriptor-wallet-using-bdk-cli"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#2-of-3-multi-signature-descriptor-wallet-using-bdk-cli"}},[t._v("#")]),t._v(" 2-of-3 Multi-Signature Descriptor Wallet using bdk-cli")]),t._v(" "),e("h2",{attrs:{id:"overview-of-the-tutorial"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#overview-of-the-tutorial"}},[t._v("#")]),t._v(" Overview of the tutorial")]),t._v(" "),e("ul",[e("li",[t._v("The purpose of this tutorial is to continue learning "),e("code",[t._v("bdk-cli")]),t._v(" as our tool to manage a 2 of 3 multi-signature wallet.")]),t._v(" "),e("li",[t._v("Generate a receive address with a spending Policy of 2 out of 3 escrow aka multi-signature.")]),t._v(" "),e("li",[t._v("Intro to more complex but standard policies to create custom encumberances aka custom spending conditions for transactions.")])]),t._v(" "),e("p",[t._v("Note that to complete this tutorial, you'll need to enable the "),e("code",[t._v("compiler")]),t._v(" and "),e("code",[t._v("electrum")]),t._v(" flags when installing or building bdk-cli, for example by installing using:")]),t._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[e("span",{pre:!0,attrs:{class:"token function"}},[t._v("cargo")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("install")]),t._v(" bdk-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--features")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("compiler,electrum\n")])])]),e("h2",{attrs:{id:"step-1-generate-the-xprvs-extended-keys-and-save-to-environment-variables"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-1-generate-the-xprvs-extended-keys-and-save-to-environment-variables"}},[t._v("#")]),t._v(" Step 1: Generate the XPRVs (Extended-Keys) and Save to environment variables")]),t._v(" "),e("blockquote",[e("p",[t._v("Create three private keys and each in their own environment variable")])]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("export XPRV_00=$(bdk-cli key generate | jq -r '.xprv')")])]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("export XPRV_01=$(bdk-cli key generate | jq -r '.xprv')")])]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("export XPRV_02=$(bdk-cli key generate | jq -r '.xprv')")])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/FwgUdwK.gif",alt:""}})]),t._v(" "),e("h3",{attrs:{id:"1a-verify-xprv-environment-variables-are-active"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#1a-verify-xprv-environment-variables-are-active"}},[t._v("#")]),t._v(" 1a: Verify XPRV environment variables are Active")]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("env | grep XPRV")])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/ZerGPbO.gif",alt:""}})]),t._v(" "),e("h2",{attrs:{id:"step-2-generate-xpubs-extended-public-keys-save-to-environment-variables"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-2-generate-xpubs-extended-public-keys-save-to-environment-variables"}},[t._v("#")]),t._v(" Step 2: Generate XPUBs (Extended Public Keys) & Save to environment variables")]),t._v(" "),e("blockquote",[e("p",[t._v("Generate the three individual Public Keys aka XPUBs using our Private key and descriptor path.")])]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v('export XPUB_00=$(bdk-cli key derive --xprv $XPRV_00 --path "m/84\'/1\'/0\'/0" | 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Single-Wallet Descriptors")]),t._v(" "),e("blockquote",[e("p",[t._v("Create the wallet Descriptor for each wallet")])]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v('export DESCRIPTOR_00="$XPRV_00/84h/1h/0h/0/*"')])]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v('export DESCRIPTOR_01="$XPRV_01/84h/1h/0h/0/*"')])]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v('export DESCRIPTOR_02="$XPRV_02/84h/1h/0h/0/*"')])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/mFrWt6b.png",alt:""}})]),t._v(" "),e("h2",{attrs:{id:"step-4-create-multi-sig-descriptor-wallets"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-4-create-multi-sig-descriptor-wallets"}},[t._v("#")]),t._v(" Step 4: Create Multi-Sig-Descriptor Wallets")]),t._v(" "),e("blockquote",[e("p",[t._v("This is how you create the 2-of-3 multi-sig output descriptor. You will need (one PrivateKey and two Xpubs) It consists of using the "),e("code",[t._v("compiler")]),t._v(" function to parse "),e("code",[t._v("policy")]),t._v(" to "),e("code",[t._v("mini-script")]),t._v(" .")])]),t._v(" "),e("ul",[e("li",[t._v("When creating the descriptor the order matters so be aware of that when following tutorial if you are for any reason changing the order of the policy.")])]),t._v(" "),e("h4",{attrs:{id:"multi-sig-wallet-0"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#multi-sig-wallet-0"}},[t._v("#")]),t._v(" Multi-Sig-Wallet 0")]),t._v(" "),e("ul",[e("li",[t._v("[ ] ▶️ "),e("code",[t._v("export MULTI_DESCRIPTOR_00=$(bdk-cli compile \"thresh(2,pk($DESCRIPTOR_00),pk($XPUB_01),pk($XPUB_02))\" | jq -r '.descriptor')")])])]),t._v(" "),e("h4",{attrs:{id:"multi-sig-wallet-1"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#multi-sig-wallet-1"}},[t._v("#")]),t._v(" Multi-Sig-Wallet 1")]),t._v(" "),e("ul",[e("li",[t._v("[ ] ▶️ "),e("code",[t._v("export MULTI_DESCRIPTOR_01=$(bdk-cli compile \"thresh(2,pk($XPUB_00),pk($DESCRIPTOR_01),pk($XPUB_02))\" | jq -r '.descriptor')")])])]),t._v(" "),e("h4",{attrs:{id:"multi-sig-wallet-2"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#multi-sig-wallet-2"}},[t._v("#")]),t._v(" Multi-Sig-Wallet 2")]),t._v(" "),e("ul",[e("li",[t._v("[ ] ▶️ "),e("code",[t._v("export MULTI_DESCRIPTOR_02=$(bdk-cli compile \"thresh(2,pk($XPUB_00),pk($XPUB_01),pk($DESCRIPTOR_02))\" | jq -r '.descriptor')")])])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/Yb8RmFS.gif",alt:""}})]),t._v(" "),e("h4",{attrs:{id:"multi-sig-2-of-3-policy-gets-compiled-to-miniscript"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#multi-sig-2-of-3-policy-gets-compiled-to-miniscript"}},[t._v("#")]),t._v(" multi-sig 2 of 3 policy gets compiled to miniscript")]),t._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# policy")]),t._v("\nthresh"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("2")]),t._v(",pk"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("XPRV_A"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(",pk"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("XPUB_B"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(",pk"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("XPUB_C"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("))")]),t._v(" \n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# miniscript")]),t._v("\nwsh"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("multi"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("2")]),t._v(",XPRV_KEY,PUBKEY_B,XPUB_C"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("))")]),t._v("\n")])])]),e("hr"),t._v(" "),e("h3",{attrs:{id:"4a-verify-multi-sig-descriptor-environment-variables-are-active"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#4a-verify-multi-sig-descriptor-environment-variables-are-active"}},[t._v("#")]),t._v(" 4a: Verify Multi-Sig-Descriptor environment variables are active")]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("env | grep MULTI")])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/aAgtlsi.gif",alt:""}})]),t._v(" "),e("hr"),t._v(" "),e("h2",{attrs:{id:"step-5-generate-receive-address-by-using-multi-sig-descriptor-wallets"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-5-generate-receive-address-by-using-multi-sig-descriptor-wallets"}},[t._v("#")]),t._v(" Step 5: Generate Receive Address by using Multi-Sig-Descriptor Wallets")]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("bdk-cli wallet --wallet wallet_name_msd00 --descriptor $MULTI_DESCRIPTOR_00 get_new_address")])]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("bdk-cli wallet --wallet wallet_name_msd01 --descriptor $MULTI_DESCRIPTOR_01 get_new_address")])]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("bdk-cli wallet --wallet wallet_name_msd02 --descriptor $MULTI_DESCRIPTOR_02 get_new_address")])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/w1fxPSn.gif",alt:""}})]),t._v(" "),e("p",[t._v("🔴 Did you generate the same address for all three? Good! Else, something might be incorrect.")]),t._v(" "),e("h2",{attrs:{id:"step-6-send-testnet-bitcoin-to-the-newly-created-receive-address"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-6-send-testnet-bitcoin-to-the-newly-created-receive-address"}},[t._v("#")]),t._v(" Step 6: Send Testnet Bitcoin to the newly created receive-address")]),t._v(" "),e("p",[e("a",{attrs:{href:"https://testnet-faucet.mempool.co",target:"_blank",rel:"noopener noreferrer"}},[t._v("Bitcoin Testnet Faucet link:1"),e("OutboundLink")],1),t._v(" "),e("a",{attrs:{href:"https://bitcoinfaucet.uo1.net",target:"_blank",rel:"noopener noreferrer"}},[t._v("Bitcoin Testnet Faucet link:2"),e("OutboundLink")],1)]),t._v(" "),e("h2",{attrs:{id:"step-7-sync-one-of-the-multi-sig-wallets"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-7-sync-one-of-the-multi-sig-wallets"}},[t._v("#")]),t._v(" Step 7: Sync one of the Multi-Sig Wallets")]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("bdk-cli wallet --wallet wallet_name_msd00 --descriptor $MULTI_DESCRIPTOR_00 sync")])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/GuefgeI.gif",alt:""}})]),t._v(" "),e("h2",{attrs:{id:"step-8-check-balance-multi-sig-wallets"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-8-check-balance-multi-sig-wallets"}},[t._v("#")]),t._v(" Step 8: Check Balance Multi-Sig Wallets")]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("bdk-cli wallet --wallet wallet_name_msd00 --descriptor $MULTI_DESCRIPTOR_00 get_balance")])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/zNciCqF.gif",alt:""}})]),t._v(" "),e("ul",[e("li",[t._v("Every wallet has access to sync and view balance.")])]),t._v(" "),e("h2",{attrs:{id:"step-9-check-multi-sig-policies-on-descriptor-wallet"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-9-check-multi-sig-policies-on-descriptor-wallet"}},[t._v("#")]),t._v(" Step 9: Check Multi-Sig Policies on Descriptor Wallet")]),t._v(" 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They can learn your\nIP address and associate the transactions you sent over it. You can only\nhope that this information will not be leaked anytime in the future with\nunpredictable consequences. In order to use Bitcoin privately, you need\nto encrypt and anonymize the data you send over the Internet.")]),t._v(" "),s("p",[t._v("Tor is one of the must-have privacy preserving tools for the Internet in\ngeneral, and for Bitcoin in particular. Tor network consists of nodes that\nuse clever cryptographic methods to encrypt user data and transfer them as\nanonymously as possible.")]),t._v(" "),s("p",[t._v("In this article we show how to integrate Tor with your BDK application.")]),t._v(" "),s("h2",{attrs:{id:"prerequisite"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#prerequisite"}},[t._v("#")]),t._v(" Prerequisite")]),t._v(" "),s("p",[t._v("First, you would need to have a Tor daemon up and running.")]),t._v(" "),s("p",[t._v("On Mac OS X you can install with Homebrew.")]),t._v(" "),s("div",{staticClass:"language-bash extra-class"},[s("pre",{pre:!0,attrs:{class:"language-bash"}},[s("code",[t._v("brew "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("install")]),t._v(" tor\nbrew services start tor\n")])])]),s("p",[t._v("On Ubuntu or other Debian-based distributions.")]),t._v(" "),s("div",{staticClass:"language-bash extra-class"},[s("pre",{pre:!0,attrs:{class:"language-bash"}},[s("code",[s("span",{pre:!0,attrs:{class:"token function"}},[t._v("sudo")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("apt")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("install")]),t._v(" tor\n")])])]),s("p",[t._v("In some cases you'll need to wait a minute or two for the bootstrapping to finish.\nIn general, Tor is not the fastest network, so if any of the examples below fail\ndue to timeout, simply restart it.")]),t._v(" "),s("p",[t._v("At the very end of the article we’ll show how to integrate Tor directly to\nyour application.")]),t._v(" "),s("p",[t._v("By default, Tor creates a "),s("a",{attrs:{href:"https://en.wikipedia.org/wiki/SOCKS",target:"_blank",rel:"noopener noreferrer"}},[t._v("SOCKS5"),s("OutboundLink")],1),t._v(" proxy\nendpoint and listens on port 9050. 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create a testnet wallet with "),s("code",[t._v("create_wallet()")]),t._v(" function and\ntry to sync it with a specific blockchain client implementation. We create a\nblockchain client using "),s("code",[t._v("create_blockchain()")]),t._v(" function. We’ll implement it\nlater for each type of blockchain client supported by BDK.")]),t._v(" "),s("h2",{attrs:{id:"electrumblockchain"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#electrumblockchain"}},[t._v("#")]),t._v(" ElectrumBlockchain")]),t._v(" "),s("p",[t._v("The Electrum client is enabled by default so the "),s("code",[t._v("Cargo.toml")]),t._v(" dependencies\nsection will look like this.")]),t._v(" "),s("div",{staticClass:"language-toml extra-class"},[s("pre",{pre:!0,attrs:{class:"language-toml"}},[s("code",[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),s("span",{pre:!0,attrs:{class:"token table class-name"}},[t._v("dependencies")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token key property"}},[t._v("bdk")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v(" 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First, we call "),s("code",[t._v("build_async()")]),t._v(" to\ncreate an asynchronous Esplora client. Second the SOCKS5 URL scheme is\n“socks5h”. It’s not a typo. The async client supports two SOCKS5 schemes\n“socks5” and “socks5h”. The difference between them is that the former\nmakes the client to resolve domain names, and the latter does not, so the\nclient passes them to the proxy as is. A regular DNS resolver cannot\nresolve Tor onion addresses, so we should use “socks5h” here.")]),t._v(" "),s("h2",{attrs:{id:"compactfiltersblockchain"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#compactfiltersblockchain"}},[t._v("#")]),t._v(" CompactFiltersBlockchain")]),t._v(" "),s("p",[t._v("Add these lines to the dependencies section of "),s("code",[t._v("Cargo.toml")]),t._v(" file to enable\nBIP-157/BIP-158 compact filter support.")]),t._v(" "),s("p",[t._v("It can take a while to sync a wallet using compact filters over Tor, so be\npatient.")]),t._v(" "),s("div",{staticClass:"language-toml extra-class"},[s("pre",{pre:!0,attrs:{class:"language-toml"}},[s("code",[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),s("span",{pre:!0,attrs:{class:"token table class-name"}},[t._v("dependencies")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token key property"}},[t._v("bdk")]),t._v(" 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After that, we continuously try to find\n“Bootstrapped 100%” string in the log file. Once we find it, Tor is\nready to proxy our connections. 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punctuation"}},[t._v("(")]),t._v("client"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("p",[t._v("In this example we create an instance of "),s("code",[t._v("Socks5Config")]),t._v(" which defines the\nTor proxy parameters for "),s("code",[t._v("ElectrumBlockchain")]),t._v(".")]),t._v(" "),s("h2",{attrs:{id:"blocking-esplorablockchain"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#blocking-esplorablockchain"}},[t._v("#")]),t._v(" Blocking EsploraBlockchain")]),t._v(" "),s("p",[t._v("The blocking version of "),s("code",[t._v("EsploraBlockchain")]),t._v(" uses "),s("code",[t._v("ureq")]),t._v(" crate to send HTTP\nrequests to Eslora backends. 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Please note, that unlike the previous examples, the Esplora client\nbuilder requires not just a proxy address, but a URL\n“socks5://127.0.0.1:9050”.")]),t._v(" "),s("h2",{attrs:{id:"asynchronous-esplorablockchain"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#asynchronous-esplorablockchain"}},[t._v("#")]),t._v(" Asynchronous EsploraBlockchain")]),t._v(" "),s("p",[t._v("There’s no need in enabling SOCKS5 for the asynchronous Esplora client,\nso we are good to go without additional dependencies.")]),t._v(" "),s("div",{staticClass:"language-toml extra-class"},[s("pre",{pre:!0,attrs:{class:"language-toml"}},[s("code",[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),s("span",{pre:!0,attrs:{class:"token table class-name"}},[t._v("dependencies")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token key property"}},[t._v("bdk")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("=")]),t._v(" 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First, we call "),s("code",[t._v("build_async()")]),t._v(" to\ncreate an asynchronous Esplora client. Second the SOCKS5 URL scheme is\n“socks5h”. It’s not a typo. The async client supports two SOCKS5 schemes\n“socks5” and “socks5h”. The difference between them is that the former\nmakes the client to resolve domain names, and the latter does not, so the\nclient passes them to the proxy as is. A regular DNS resolver cannot\nresolve Tor onion addresses, so we should use “socks5h” here.")]),t._v(" "),s("h2",{attrs:{id:"compactfiltersblockchain"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#compactfiltersblockchain"}},[t._v("#")]),t._v(" CompactFiltersBlockchain")]),t._v(" "),s("p",[t._v("Add these lines to the dependencies section of "),s("code",[t._v("Cargo.toml")]),t._v(" file to enable\nBIP-157/BIP-158 compact filter support.")]),t._v(" "),s("p",[t._v("It can take a while to sync a wallet using compact filters over Tor, so be\npatient.")]),t._v(" "),s("div",{staticClass:"language-toml extra-class"},[s("pre",{pre:!0,attrs:{class:"language-toml"}},[s("code",[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),s("span",{pre:!0,attrs:{class:"token table class-name"}},[t._v("dependencies")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token key property"}},[t._v("bdk")]),t._v(" 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Using "),s("code",[t._v("libtor")]),t._v(" crate you can bundle\nTor daemon with your app.")]),t._v(" "),s("p",[s("code",[t._v("libtor")]),t._v(" builds a Tor binary from the source files. Since Tor is written in C\nyou'll need a C compiler and build tools.")]),t._v(" "),s("p",[t._v("Install these packages on Mac OS X:")]),t._v(" "),s("div",{staticClass:"language-bash extra-class"},[s("pre",{pre:!0,attrs:{class:"language-bash"}},[s("code",[t._v("xcode-select "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--install")]),t._v("\nbrew "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("install")]),t._v(" autoconf\nbrew "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("install")]),t._v(" automake\nbrew "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("install")]),t._v(" libtool\nbrew "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("install")]),t._v(" openssl\nbrew "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("install")]),t._v(" pkg-config\n"),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("export")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token assign-left 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See {} for details"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("log_file_name\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("thread"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("sleep")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Duration")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("from_millis")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("1000")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n started "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("find_string_in_log")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("log_file_name"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Bootstrapped 100%"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("into")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token macro property"}},[t._v("println!")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Tor started"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token macro property"}},[t._v("format!")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"127.0.0.1:{}"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" socks_port"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("p",[t._v("First, we create a Tor object, and then we call "),s("code",[t._v("start_background()")]),t._v(" method\nto start it in the background. After that, we continuously try to find\n“Bootstrapped 100%” string in the log file. Once we find it, Tor is\nready to proxy our connections. We use port 19050 because, the user can\nhave their own instance of Tor running already.")]),t._v(" "),s("p",[t._v("Next you can modify "),s("code",[t._v("create_blockchain()")]),t._v(" like this")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fn")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function-definition function"}},[t._v("create_blockchain")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("->")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("ElectrumBlockchain")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" url "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"ssl://electrum.blockstream.info:60002"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" socks_addr "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("start_tor")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n \n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("...")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("p",[t._v("In this example we start Tor first, then use the address returned by\n"),s("code",[t._v("start_tor()")]),t._v(" function as proxy address.")]),t._v(" "),s("p",[t._v("We omitted "),s("code",[t._v("find_string_in_log()")]),t._v(" and "),s("code",[t._v("truncate_log()")]),t._v(" for brevity. You\ncan find their implementations in "),s("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/blob/master/examples/esplora_backend_with_tor.rs",target:"_blank",rel:"noopener noreferrer"}},[t._v("esplora_backend_with_tor.rs"),s("OutboundLink")],1)])])}),[],!1,null,null,null);s.default=e.exports}}]); \ No newline at end of file diff --git a/assets/js/43.94ed6f03.js b/assets/js/43.3b234b14.js similarity index 99% rename from assets/js/43.94ed6f03.js rename to assets/js/43.3b234b14.js index 6acc1ef2b4..922c259dc3 100644 --- a/assets/js/43.94ed6f03.js +++ b/assets/js/43.3b234b14.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[43],{391:function(e,t,i){"use strict";i.r(t);var r=i(7),o=Object(r.a)({},(function(){var e=this,t=e._self._c;return t("ContentSlotsDistributor",{attrs:{"slot-key":e.$parent.slotKey}},[t("p",[t("strong",[e._v("tldr;")]),e._v(" "),t("em",[e._v("we can't produce and maintain bindings for all Rust crates we get requests for, but we are working to help others build their own bindings by (1) making our architecture composable and reusable, and (2) building strong examples and documentation on how to do it for other crates.")])]),e._v(" "),t("br"),e._v(" "),t("p",[e._v("Over the past 2 years, the Bitcoin Development Kit team has been successful at building and releasing language bindings for our Rust library. In particular, over the past 18 months we have locked in and solidified our approach for the iOS, Android, Kotlin, Java, and Python bindings by using a Rust library called "),t("a",{attrs:{href:"https://github.com/mozilla/uniffi-rs",target:"_blank",rel:"noopener noreferrer"}},[e._v("Uniffi"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("Over the course of the year, we've had many requests to add to the bindings certain features that are not directly in the Rust BDK library. These request mainly break down into two groups:")]),e._v(" "),t("ol",[t("li",[e._v('Features that are part of crates "upstream" of BDK (rust-bitcoin, rust-miniscript)')]),e._v(" "),t("li",[e._v("Features that are not but that have Rust crates and would be useful on mobile (payjoin, coinjoin implementations, silent payments, BIP-47)")])]),e._v(" "),t("h2",{attrs:{id:"current-architecture"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#current-architecture"}},[e._v("#")]),e._v(" Current architecture")]),e._v(" "),t("p",[e._v("The current architecture for the BDK bindings is more or less wrapping the bdk, rust-bitcoin, and rust-miniscript crates and exposing an API that allows users to leverage them similarly to how they would BDK in Rust if they were using it in a Rust project.")]),e._v(" "),t("p",[e._v('While we started with a simplified version of the Rust BDK API, over time users asked for more and more functionality, and exposing some of the underlying rust-bitcoin constructs became important. This makes sense, and indeed users of the bitcoin development kit in Rust have access to all the related APIs by simply importing rust-bitcoin and rust-miniscript, hence our desire to accommodate these use cases as well. However, this is currently done all in one "bindings" library (i.e. if you import '),t("code",[e._v("bdk-android")]),e._v(" in a project, you'll have access to an API that is mostly bdk-based, but also contains a bit of rust-bitcoin and rust-miniscript).")]),e._v(" "),t("h2",{attrs:{id:"moving-forward-building-a-family-of-libraries"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#moving-forward-building-a-family-of-libraries"}},[e._v("#")]),e._v(" Moving forward: building a family of libraries")]),e._v(" "),t("p",[e._v("At the same time, other Rust-based libraries started using the uniffi approach (a good example is "),t("a",{attrs:{href:"https://github.com/lightningdevkit/ldk-node",target:"_blank",rel:"noopener noreferrer"}},[e._v("ldk-node"),t("OutboundLink")],1),e._v(") to expose bindings. 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It comes with a fully working Android app you can leverage to test out whatever bindings you're building.")])])])}),[],!1,null,null,null);t.default=o.exports}}]); \ No newline at end of file +(window.webpackJsonp=window.webpackJsonp||[]).push([[43],{390:function(e,t,i){"use strict";i.r(t);var r=i(7),o=Object(r.a)({},(function(){var e=this,t=e._self._c;return t("ContentSlotsDistributor",{attrs:{"slot-key":e.$parent.slotKey}},[t("p",[t("strong",[e._v("tldr;")]),e._v(" "),t("em",[e._v("we can't produce and maintain bindings for all Rust crates we get requests for, but we are working to help others build their own bindings by (1) making our architecture composable and reusable, and (2) building strong examples and documentation on how to do it for other crates.")])]),e._v(" "),t("br"),e._v(" "),t("p",[e._v("Over the past 2 years, the Bitcoin Development Kit team has been successful at building and releasing language bindings for our Rust library. In particular, over the past 18 months we have locked in and solidified our approach for the iOS, Android, Kotlin, Java, and Python bindings by using a Rust library called "),t("a",{attrs:{href:"https://github.com/mozilla/uniffi-rs",target:"_blank",rel:"noopener noreferrer"}},[e._v("Uniffi"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("Over the course of the year, we've had many requests to add to the bindings certain features that are not directly in the Rust BDK library. 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Functions, enums, objects, callbacks, multi-libraries, a lot of information and examples to get you started.")]),e._v(" "),t("li",[t("strong",[t("a",{attrs:{href:"https://github.com/thunderbiscuit/bitcoin-frontier",target:"_blank",rel:"noopener noreferrer"}},[e._v("Sandbox library "),t("code",[e._v("bitcoin-frontier")]),t("OutboundLink")],1)]),e._v(". This repository is meant as a sandbox to start developing and testing your own bindings. Simply fork it and start adding code! It comes with a fully working Android app you can leverage to test out whatever bindings you're building.")])])])}),[],!1,null,null,null);t.default=o.exports}}]); \ No newline at end of file diff --git a/assets/js/46.5deb1292.js b/assets/js/46.d532ba06.js similarity index 99% rename from assets/js/46.5deb1292.js rename to assets/js/46.d532ba06.js index 3920b4ef57..0deb6c306f 100644 --- a/assets/js/46.5deb1292.js +++ b/assets/js/46.d532ba06.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[46],{394:function(e,t,r){"use strict";r.r(t);var a=r(7),s=Object(a.a)({},(function(){var e=this,t=e._self._c;return t("ContentSlotsDistributor",{attrs:{"slot-key":e.$parent.slotKey}},[t("h2",{attrs:{id:"introduction"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#introduction"}},[e._v("#")]),e._v(" Introduction")]),e._v(" "),t("p",[e._v("I have tried to setup a 2 of 2 multi signature infrastructure with two\ndifferent wallets, which know nothing about each other, but are compliant with\ntwo very important protocols: "),t("a",{attrs:{href:"https://bitcoinops.org/en/topics/output-script-descriptors/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Output Descriptors"),t("OutboundLink")],1),e._v(" and "),t("a",{attrs:{href:"https://en.bitcoin.it/wiki/BIP_0174",target:"_blank",rel:"noopener noreferrer"}},[e._v("Partially Signed\nBitcoin Transactions"),t("OutboundLink")],1),e._v(" described in BIP 174.")]),e._v(" "),t("p",[e._v("Before these two protocols came into existence, making a multi signature setup\nand spending from it was possible only if the involved parties were using the\nsame wallet (eg. Electrum Desktop Wallet). This limitation was due to the fact\nthat the two parties had to agree:")]),e._v(" "),t("ul",[t("li",[e._v("on the particular type of script and address to use")]),e._v(" "),t("li",[e._v("on the way the transaction would be shared composed and signed with all the\ninvolved parties.")])]),e._v(" "),t("p",[t("a",{attrs:{href:"https://bitcoinops.org/en/topics/output-script-descriptors/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Output Descriptors"),t("OutboundLink")],1),e._v(" are a way to express which kind scriptPubKey and\naddresses to produce with a key or a series of keys.")]),e._v(" "),t("p",[t("a",{attrs:{href:"https://en.bitcoin.it/wiki/BIP_0174",target:"_blank",rel:"noopener noreferrer"}},[e._v("PSBT"),t("OutboundLink")],1),e._v(" is instead the standard protocol used to create a transaction and to enrich\nit with the necessary signatures and other components, to make it valid and complete.")]),e._v(" "),t("p",[e._v("Together they provide a common ground to create and use a multi signature\ninfrastructure in a heterogeneous environment, and this is what I have put\nto test.")]),e._v(" "),t("h2",{attrs:{id:"the-use-case"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#the-use-case"}},[e._v("#")]),e._v(" The use case")]),e._v(" "),t("p",[e._v("Imagine Alice and Bob owning a company and being willing to put the corporate cash\nin a 2of2 multi signature setup, so that each one of them have to agree and sign each\ntransaction.")]),e._v(" "),t("h2",{attrs:{id:"the-role-of-descriptors"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#the-role-of-descriptors"}},[e._v("#")]),e._v(" The role of Descriptors")]),e._v(" "),t("p",[e._v("If Alice and Bob cannot agree on the software to use, to monitor the same financial\nsituation, the two software must control and produce exactly the same series\nof multisignature addresses.")]),e._v(" "),t("p",[e._v("To make two different software produce the same addresses in a deterministic way\nwe must ensure that they:")]),e._v(" "),t("ul",[t("li",[e._v("produce the same pair of public keys")]),e._v(" "),t("li",[e._v("combine them in the same order")]),e._v(" "),t("li",[e._v("put them inside the same scriptPubKey to produce the same address")])]),e._v(" "),t("p",[e._v("Here is where the "),t("a",{attrs:{href:"https://bitcoinops.org/en/topics/output-script-descriptors/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Output Descriptors"),t("OutboundLink")],1),e._v(" come into play. They describe:")]),e._v(" "),t("ul",[t("li",[e._v("the sequence of public keys each extended key (xpub) will produce")]),e._v(" "),t("li",[e._v("the sequence in which the new public keys of various parties will enter into\nthe script")]),e._v(" "),t("li",[e._v("the type of script the wallet will prepare with that group keys and so the type\nof address the group of keys will produce.")])]),e._v(" "),t("p",[t("strong",[e._v("By sharing the same Descriptor, every compliant wallet will derive\ndeterministically the same series of multisig addresses")]),e._v(".")]),e._v(" "),t("p",[e._v("Imagine Alice using Bitcoin Core (from now on "),t("a",{attrs:{href:"https://bitcoincore.org/",target:"_blank",rel:"noopener noreferrer"}},[e._v('"Core"'),t("OutboundLink")],1),e._v(') as a\nWallet and Bob using a "Last generation" wallet, Bitcoin Development Kit\n(from now on '),t("a",{attrs:{href:"https://bitcoindevkit.org/",target:"_blank",rel:"noopener noreferrer"}},[e._v('"BDK"'),t("OutboundLink")],1),e._v("), which uses descriptors and miniscript natively.")]),e._v(" "),t("p",[e._v("Each of these two software wallets should be able to:")]),e._v(" "),t("ul",[t("li",[e._v("Create a new address which is seen as belonging to the multi signature\nwallet in both software")]),e._v(" "),t("li",[e._v("Express the consent of each party by partially signing the transaction in a way\nthe other wallet can understand and complete it with its own signature.")])]),e._v(" "),t("p",[e._v("The infrastructure of multiple Extended keys combined toghether to produce\nmultiple multisignature addresses is often referred as\n"),t("em",[t("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[e._v("Hierarchical Deterministic"),t("OutboundLink")],1),e._v(" multi signature wallet or HDM")]),e._v(".")]),e._v(" "),t("p",[e._v("What follows are the steps to create the HDM usable both in Core and\nin BDK.")]),e._v(" "),t("p",[t("em",[e._v("Note: In Core, "),t("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/pull/16528",target:"_blank",rel:"noopener noreferrer"}},[e._v("Descriptor wallets"),t("OutboundLink")],1),e._v(" are still experimental and in general,\nboth wallets should be tested for descriptor capabilities only in testnet.")])]),e._v(" "),t("h2",{attrs:{id:"our-playground"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#our-playground"}},[e._v("#")]),e._v(" Our playground")]),e._v(" "),t("p",[e._v("We will build a 2of2 key set up that will be used cooperatively by Bitcoin Core\nand Bitcoin Development Kit.\nThe steps Alice and Bob will do are:")]),e._v(" "),t("ol",[t("li",[e._v("creation of the seed and the derived Extended Master Public and send it to\nthe other party")]),e._v(" "),t("li",[e._v("Create the multi signature descriptor for each wallet")]),e._v(" "),t("li",[e._v("Use each other's software to receive testnet coins from a faucet")]),e._v(" "),t("li",[e._v("return part of the coins to the faucet signing the transaction with both\nwallets.")])]),e._v(" "),t("p",[e._v("We need:")]),e._v(" "),t("ul",[t("li",[t("a",{attrs:{href:"https://bitcoindevkit.org/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Bitcoin Dev Kit"),t("OutboundLink")],1)]),e._v(" "),t("li",[t("a",{attrs:{href:"https://bitcoincore.org/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Bitcoin Core"),t("OutboundLink")],1),e._v(" (v0.21.0 or later)")])]),e._v(" "),t("h3",{attrs:{id:"1-creating-the-seeds-and-the-derived-extended-public-keys"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#1-creating-the-seeds-and-the-derived-extended-public-keys"}},[e._v("#")]),e._v(" 1. Creating the seeds and the derived Extended Public keys")]),e._v(" "),t("h4",{attrs:{id:"seeds-and-extended-master-public"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#seeds-and-extended-master-public"}},[e._v("#")]),e._v(" Seeds and Extended Master Public")]),e._v(" "),t("p",[e._v("We build an Extended Private Master Key for both wallet and derive a BIP84\nExtended Master Public for Bitcoin Core and then for BDK.")]),e._v(" "),t("p",[e._v("For Bitcoin Core (Alice):")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("# new Extended wallet data\nexport core_key=$(bdk-cli key generate)\n\n# New Extended Master Private\n\nexport core_xprv=$(echo $core_key | jq -r '.xprv')\n\n# Now I derive the xpubs (one for receiving and one for the change)\n# together with informations about the derivation path to be communicated\n# to BDK wallet's owner (Bob).\n\nexport core_xpub_84_for_rec_desc=$(bdk-cli key derive --path m/84h/0h/0h/0 --xprv $core_xprv | jq -r '.xpub')\nexport core_xpub_84_for_chg_desc=$(bdk-cli key derive --path m/84h/0h/0h/1 --xprv $core_xprv | jq -r '.xpub')\n")])])]),t("p",[e._v("For BDK (Bob) we do the same:")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("# new Extended wallet data\n\nexport BDK_key=$(bdk-cli key generate)\n\n# New Extended Master Private\n\nexport BDK_xprv=$(echo $BDK_key | jq -r '.xprv')\n\n# Now I build the derived xpubs to be communicated (to Alice).\n\nexport BDK_xpub_84_for_rec_desc=$(bdk-cli key derive --path m/84h/0h/0h/0 --xprv $BDK_xprv | jq -r '.xpub')\nexport BDK_xpub_84_for_chg_desc=$(bdk-cli key derive --path m/84h/0h/0h/1 --xprv $BDK_xprv | jq -r '.xpub')\n")])])]),t("h3",{attrs:{id:"2-creation-of-the-multi-signature-descriptor-for-each-wallet"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#2-creation-of-the-multi-signature-descriptor-for-each-wallet"}},[e._v("#")]),e._v(" 2. Creation of the multi signature descriptor for each wallet")]),e._v(" "),t("p",[e._v("To build a multisig wallet, each wallet owner must compose the descriptor\nadding:")]),e._v(" "),t("ul",[t("li",[e._v("his derived extended "),t("strong",[e._v("private")]),e._v(" key AND")]),e._v(" "),t("li",[e._v("all the extended "),t("strong",[e._v("public")]),e._v(" keys of the other wallets involved in the\nmulti signature setup")])]),e._v(" "),t("p",[t("em",[e._v("The different nature of the two keys (one is private and one is public) is\ndue to the fact that each wallet, to be able to partially sign the transaction,\n"),t("strong",[e._v("must manage the private key of the wallet's owner")])]),e._v(" AND have the other\nparty's public key. Otherwise, if we put both public keys, we would obtain\na watch-only wallet unable to sign the transactions. If we\nhad both extended private keys inside the descriptor, we would allow each party\nto finalize the transactions autonomously.")]),e._v(" "),t("h4",{attrs:{id:"in-bitcoin-core"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#in-bitcoin-core"}},[e._v("#")]),e._v(" In Bitcoin Core:")]),e._v(" "),t("p",[e._v("In our case, the multi signature descriptor for Bitcoin Core will be composed\nwith:")]),e._v(" "),t("ul",[t("li",[e._v("The BIP84 derived Extended "),t("strong",[e._v("Public")]),e._v(" Key from BDK")]),e._v(" "),t("li",[e._v("The BIP84 derived Extended "),t("strong",[e._v("Private")]),e._v(" Key from Core.")])]),e._v(" "),t("p",[e._v("BDK wallet's owner will send to Core's owner the derived xpub for this purpose.\nThis is how the Core's multisig descriptor will be created and put into an\nenvironment variable:")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("export core_rec_desc=\"wsh(multi(2,$BDK_xpub_84_for_rec_desc,$core_xprv/84'/0'/0'/0/*))\"\n")])])]),t("p",[e._v("Where of course "),t("code",[e._v("$BDK_xpub_84_for_rec_desc")]),e._v("is the derived master public created\nin BDK and received by Core's owner.")]),e._v(" "),t("p",[e._v("The meaning of what is before and after is illustrated in the doc that explain\nthe use of "),t("a",{attrs:{href:"https://bitcoinops.org/en/topics/output-script-descriptors/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Output Descriptors in Bitcoin Core"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("We add the necessary checksum using the specific "),t("code",[e._v("bitcoin-cli")]),e._v(" call.")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("export core_rec_desc_chksum=$core_rec_desc#$(bitcoin-cli -testnet getdescriptorinfo $core_rec_desc | jq -r '.checksum')\n")])])]),t("p",[e._v("We repeat the same to build the descriptor to receive the change.")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("export core_chg_desc=\"wsh(multi(2,$BDK_xpub_84_for_chg_desc,$core_xprv/84'/0'/0'/1/*))\"\nexport core_chg_desc_chksum=$core_chg_desc#$(bitcoin-cli -testnet getdescriptorinfo $core_chg_desc|jq -r '.checksum')\n")])])]),t("h4",{attrs:{id:"in-bdk"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#in-bdk"}},[e._v("#")]),e._v(" In BDK:")]),e._v(" "),t("p",[e._v("For BDK we set the derivation for receiving addresses and change addresses\nin the command line (maybe setting an alias)")]),e._v(" "),t("p",[e._v("Building the descriptor:")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("export BDK_rec_desc=\"wsh(multi(2,$BDK_xprv/84'/0'/0'/0/*,$core_xpub_84_for_rec_desc))\"`\n")])])]),t("p",[e._v("Please note that the order of the extended key in the descriptor MUST be the\nsame in the 2 wallets.")]),e._v(" "),t("p",[t("em",[e._v("We have chosen to put BDK first and in each software wallet, the public key\nderived from BDK will always come first. In alternative, we could have chosen to\nproduce the descriptor, "),t("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/pull/17056?ref=tokendaily",target:"_blank",rel:"noopener noreferrer"}},[e._v("chosing a "),t("code",[e._v("soretedmulti")]),e._v(" multisignature setup"),t("OutboundLink")],1)]),e._v(".")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("export BDK_rec_desc_chksum=$BDK_rec_desc#$(bitcoin-cli -testnet getdescriptorinfo $BDK_rec_desc | jq -r '.checksum')\nexport BDK_chg_desc=\"wsh(multi(2,$BDK_xprv/84'/0'/0'/1/*,$core_xpub_84_for_chg_desc))\"\nexport BDK_chg_desc_chksum=$BDK_chg_desc#$(bitcoin-cli -testnet getdescriptorinfo $BDK_chg_desc | jq -r '.checksum')\n")])])]),t("p",[e._v("To take a look at the variables we have produced so far:")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("env | grep 'core_'\nenv | grep 'BDK_'\n")])])]),t("p",[e._v("Now we will use the multisig descriptor wallet to receive testnet coins with\nAlice and Bob's software")]),e._v(" "),t("h3",{attrs:{id:"3-use-each-others-software-to-receive-testnet-coins-from-a-faucet"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#3-use-each-others-software-to-receive-testnet-coins-from-a-faucet"}},[e._v("#")]),e._v(" 3. Use each other's software to receive testnet coins from a faucet")]),e._v(" "),t("h4",{attrs:{id:"in-bitcoin-core-2"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#in-bitcoin-core-2"}},[e._v("#")]),e._v(" In Bitcoin Core")]),e._v(" "),t("p",[e._v('Alice must create an empty, experimental new "descriptors wallet" in Core and\nto import the multisig Output Descriptor.')]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v('bitcoin-cli -testnet createwallet "multisig2of2withBDK" false true "" false true false\n')])])]),t("p",[e._v("The flag are to:")]),e._v(" "),t("ul",[t("li",[e._v("use the private keys")]),e._v(" "),t("li",[e._v("make it empty")]),e._v(" "),t("li",[e._v("no password provided to the wallet")]),e._v(" "),t("li",[e._v("reusing of addresses not allowed")]),e._v(" "),t("li",[e._v('"new experimental descriptors wallet"')]),e._v(" "),t("li",[e._v("don't load it on start up")])]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v('bitcoin-cli -testnet -rpcwallet=multisig2of2withBDK importdescriptors "[{\\"desc\\":\\"$core_rec_desc_chksum\\",\\"timestamp\\":\\"now\\",\\"active\\":true,\\"internal\\":false},{\\"desc\\":\\"$core_chg_desc_chksum\\",\\"timestamp\\":\\"now\\",\\"active\\":true,\\"internal\\":true}]"\n')])])]),t("p",[e._v("Now Alice asks for her first receiving multisignature address.")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("export first_address=$(bitcoin-cli -testnet -rpcwallet=multisig2of2withBDK getnewaddress)\necho $first_address\n")])])]),t("h4",{attrs:{id:"bdk"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#bdk"}},[e._v("#")]),e._v(" BDK")]),e._v(" "),t("p",[e._v("In BDK Bob can specify directly the descriptors on the command line to produce\nthe multisig address, because BDK is descriptors aware natively.")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v('repl -d "$BDK_rec_desc_chksum" -c "$BDK_chg_desc_chksum" -n testnet -w $BDK_fingerprint get_new_address`\n')])])]),t("p",[e._v('Et voilà: if we have done everything correctly, the newly created address in\nCore is the same of the newly created address in BDK. this is part of the\n"miracle" of descriptors\' interoperability.')]),e._v(" "),t("h4",{attrs:{id:"we-ask-for-testnet-coins-giving-the-first-created-address"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#we-ask-for-testnet-coins-giving-the-first-created-address"}},[e._v("#")]),e._v(" We ask for testnet coins giving the first created address.")]),e._v(" "),t("p",[e._v('To find testnet coins for free, you can just google "testnet faucet" and you\nshould find some satoshis to play with. Just give to the site your first\ngenerated address and, in twenty minutes, you will find the satoshis in\nyour balance both in Core and in BDK.')]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v('# to check it in Core:\n\nbitcoin-cli -testnet -rpcwallet=multisig2of2withBDK getbalance\n\n# In BDK:\n\n# Sync with the blockchain\nrepl -d "$BDK_rec_desc_chksum" -c "$BDK_chg_desc_chksum" -n testnet -w $BDK_fingerprint sync\n# Get the balance\nrepl -d "$BDK_rec_desc_chksum" -c "$BDK_chg_desc_chksum" -n testnet -w $BDK_fingerprint get_balance\n')])])]),t("p",[e._v("Some testnet faucets have an address to send back the unused satoshi after\nthe use. Take note of that because we will use it in the next step.")]),e._v(" "),t("h3",{attrs:{id:"4-we-return-part-of-the-satoshis-received-back-to-the-faucet"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#4-we-return-part-of-the-satoshis-received-back-to-the-faucet"}},[e._v("#")]),e._v(" 4. we return part of the satoshis received back to the faucet")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v('export psbt=$(bitcoin-cli -testnet -rpcwallet=multisig2of2withBDK walletcreatefundedpsbt "[]" "[{\\"tb1qrcesfj9f2d7x40xs6ztnlrcgxhh6vsw8658hjdhdy6qgkf6nfrds9rp79a\\":0.000012}]" | jq -r \'.psbt\')\n\nexport psbt=$(bitcoin-cli -testnet -rpcwallet=multisig2of2withBDK walletprocesspsbt $psbt | jq -r \'.psbt\')\n{\n "psbt": "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",\n "complete": false\n}\n')])])]),t("p",[e._v("Exactly! Note the "),t("code",[e._v('"complete": false')]),e._v(". We have processed the transaction with\nCore but we miss one of the necessary key of the multisig 2of2 setup (The one\ncontained inside BDK).")]),e._v(" "),t("p",[t("code",[e._v("tb1qrcesfj9f2d7x40xs6ztnlrcgxhh6vsw8658hjdhdy6qgkf6nfrds9rp79a")]),e._v(" is the address\nwe got from the faucet site to return the satoshis.")]),e._v(" "),t("p",[e._v("The "),t("a",{attrs:{href:"https://en.bitcoin.it/wiki/BIP_0174",target:"_blank",rel:"noopener noreferrer"}},[e._v("PSBT"),t("OutboundLink")],1),e._v(" is sent over to the BDK wallet owner who tries to sign the\ntransaction:")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v('repl -d "$BDK_rec_desc_chksum" -c "$BDK_chg_desc_chksum" -n testnet -w $BDK_fingerprint sign --psbt $psbt\n{\n "is_finalized": true,\n "psbt": "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"\n}\n')])])]),t("p",[e._v('The signature has succeded (note the "is_finalized": true,) and now we can\nbroadcast the transction.')]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v('repl -d "$BDK_rec_desc_chksum" -c "$BDK_chg_desc_chksum" -n testnet -w $BDK_fingerprint broadcast --psbt "cHNidP8BAIkCAAAAATj90EC+NAuXj7y6SseZJucoJM6sGnUcVm9koTveZECTAAAAAAD+////AmACAAAAAAAAIgAg98ol9j4AalD71E0mV5QV0uM6/vCT+pi2twxr/zrvLROwBAAAAAAAACIAIB4zBMipU3xqvNDQlz+PCDXvpkHH1Q95Nu0mgIsnU0jbAAAAAAABAIkCAAAAAQS+ObgGG6UwtvaO3KYph2E3/ws7Q83RbmR3rxC0fKYSAQAAAAD+////AtAHAAAAAAAAIgAg6GXadcNj7k4yKUbnVlTLiedXQFXYdCBoNygop/PISNDAHQAAAAAAACIAIBQpiDTgPIMt0ld8cmuYqlY+EIPjvrmMqZruDhs61hQNAAAAAAEBK9AHAAAAAAAAIgAg6GXadcNj7k4yKUbnVlTLiedXQFXYdCBoNygop/PISNAiAgNt0j7Ae0iA7qlLolruNqLWkPA96J0qgMLK1M7WOGMAfUcwRAIgS6x0i1J1HRzllIPf4WlFY+Dl8kCCLK81TL2djZxTFXMCICJVBKkKNxu1w1mRVor6iFTSVXiJjmWwBXVeJLISvBwAASICArn3tec7n7318rnWqf0dIIwtLtfxo6Zt0HV70UvZYaWvRzBEAiBkVDLgVEwvENnLx+04o7gGpGjFDBwAXTJmf8Yvo35oygIgbuBkHsvPC9jmZcMZ9P+Pwp01yxSaWo+5feyPmd3ai1kBAQVHUiECufe15zufvfXyudap/R0gjC0u1/Gjpm3QdXvRS9lhpa8hA23SPsB7SIDuqUuiWu42otaQ8D3onSqAwsrUztY4YwB9Uq4iBgNt0j7Ae0iA7qlLolruNqLWkPA96J0qgMLK1M7WOGMAfRg7+VpcVAAAgAAAAIAAAACAAAAAAAAAAAAiBgK597XnO5+99fK51qn9HSCMLS7X8aOmbdB1e9FL2WGlrxg0TDZwVAAAgAAAAIAAAACAAAAAAAAAAAABBwABCNoEAEcwRAIgZFQy4FRMLxDZy8ftOKO4BqRoxQwcAF0yZn/GL6N+aMoCIG7gZB7LzwvY5mXDGfT/j8KdNcsUmlqPuX3sj5nd2otZAUcwRAIgS6x0i1J1HRzllIPf4WlFY+Dl8kCCLK81TL2djZxTFXMCICJVBKkKNxu1w1mRVor6iFTSVXiJjmWwBXVeJLISvBwAAUdSIQK597XnO5+99fK51qn9HSCMLS7X8aOmbdB1e9FL2WGlryEDbdI+wHtIgO6pS6Ja7jai1pDwPeidKoDCytTO1jhjAH1SrgABAUdSIQKnHLwN6y9dw9SuBnlo3GoQ7Dtz/KGlTQbbZODJQilyHCECxyoY5j7gkI8ku+2X2jDdrXYDSnH//ue1VxmYc/1Fk5dSriICAqccvA3rL13D1K4GeWjcahDsO3P8oaVNBttk4MlCKXIcGDRMNnBUAACAAAAAgAAAAIABAAAAAwAAACICAscqGOY+4JCPJLvtl9ow3a12A0px//7ntVcZmHP9RZOXGDv5WlxUAACAAAAAgAAAAIABAAAAAwAAAAAA"\n{\n "txid": "a0b082e3b0579822d4a0b0fa95a4c4662f6b128ffd43fdcfe53c37473ce85dee"\n}\n')])])]),t("h2",{attrs:{id:"conclusion"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#conclusion"}},[e._v("#")]),e._v(" Conclusion")]),e._v(" "),t("p",[e._v("We have built an HDM and we have used it with two indipendent wallets, which\nare compatible with "),t("a",{attrs:{href:"https://en.bitcoin.it/wiki/BIP_0174",target:"_blank",rel:"noopener noreferrer"}},[e._v("BIP 174"),t("OutboundLink")],1),e._v(" and "),t("a",{attrs:{href:"https://bitcoinops.org/en/topics/output-script-descriptors/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Output Descriptors"),t("OutboundLink")],1),e._v(". Hopefully we\nwill see many other compatible wallets beyound "),t("a",{attrs:{href:"https://bitcoincore.org/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Bitcoin Core"),t("OutboundLink")],1),e._v(" and "),t("a",{attrs:{href:"https://bitcoindevkit.org/",target:"_blank",rel:"noopener noreferrer"}},[e._v("BDK"),t("OutboundLink")],1),e._v(",\nwith which we will be able to easily set up multi signature schemes.")])])}),[],!1,null,null,null);t.default=s.exports}}]); \ No newline at end of file +(window.webpackJsonp=window.webpackJsonp||[]).push([[46],{405:function(e,t,r){"use strict";r.r(t);var a=r(7),s=Object(a.a)({},(function(){var e=this,t=e._self._c;return t("ContentSlotsDistributor",{attrs:{"slot-key":e.$parent.slotKey}},[t("h2",{attrs:{id:"introduction"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#introduction"}},[e._v("#")]),e._v(" Introduction")]),e._v(" "),t("p",[e._v("I have tried to setup a 2 of 2 multi signature infrastructure with two\ndifferent wallets, which know nothing about each other, but are compliant with\ntwo very important protocols: "),t("a",{attrs:{href:"https://bitcoinops.org/en/topics/output-script-descriptors/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Output Descriptors"),t("OutboundLink")],1),e._v(" and "),t("a",{attrs:{href:"https://en.bitcoin.it/wiki/BIP_0174",target:"_blank",rel:"noopener noreferrer"}},[e._v("Partially Signed\nBitcoin Transactions"),t("OutboundLink")],1),e._v(" described in BIP 174.")]),e._v(" "),t("p",[e._v("Before these two protocols came into existence, making a multi signature setup\nand spending from it was possible only if the involved parties were using the\nsame wallet (eg. Electrum Desktop Wallet). This limitation was due to the fact\nthat the two parties had to agree:")]),e._v(" "),t("ul",[t("li",[e._v("on the particular type of script and address to use")]),e._v(" "),t("li",[e._v("on the way the transaction would be shared composed and signed with all the\ninvolved parties.")])]),e._v(" "),t("p",[t("a",{attrs:{href:"https://bitcoinops.org/en/topics/output-script-descriptors/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Output Descriptors"),t("OutboundLink")],1),e._v(" are a way to express which kind scriptPubKey and\naddresses to produce with a key or a series of keys.")]),e._v(" "),t("p",[t("a",{attrs:{href:"https://en.bitcoin.it/wiki/BIP_0174",target:"_blank",rel:"noopener noreferrer"}},[e._v("PSBT"),t("OutboundLink")],1),e._v(" is instead the standard protocol used to create a transaction and to enrich\nit with the necessary signatures and other components, to make it valid and complete.")]),e._v(" "),t("p",[e._v("Together they provide a common ground to create and use a multi signature\ninfrastructure in a heterogeneous environment, and this is what I have put\nto test.")]),e._v(" "),t("h2",{attrs:{id:"the-use-case"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#the-use-case"}},[e._v("#")]),e._v(" The use case")]),e._v(" "),t("p",[e._v("Imagine Alice and Bob owning a company and being willing to put the corporate cash\nin a 2of2 multi signature setup, so that each one of them have to agree and sign each\ntransaction.")]),e._v(" "),t("h2",{attrs:{id:"the-role-of-descriptors"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#the-role-of-descriptors"}},[e._v("#")]),e._v(" The role of Descriptors")]),e._v(" "),t("p",[e._v("If Alice and Bob cannot agree on the software to use, to monitor the same financial\nsituation, the two software must control and produce exactly the same series\nof multisignature addresses.")]),e._v(" "),t("p",[e._v("To make two different software produce the same addresses in a deterministic way\nwe must ensure that they:")]),e._v(" "),t("ul",[t("li",[e._v("produce the same pair of public keys")]),e._v(" "),t("li",[e._v("combine them in the same order")]),e._v(" "),t("li",[e._v("put them inside the same scriptPubKey to produce the same address")])]),e._v(" "),t("p",[e._v("Here is where the "),t("a",{attrs:{href:"https://bitcoinops.org/en/topics/output-script-descriptors/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Output Descriptors"),t("OutboundLink")],1),e._v(" come into play. They describe:")]),e._v(" "),t("ul",[t("li",[e._v("the sequence of public keys each extended key (xpub) will produce")]),e._v(" "),t("li",[e._v("the sequence in which the new public keys of various parties will enter into\nthe script")]),e._v(" "),t("li",[e._v("the type of script the wallet will prepare with that group keys and so the type\nof address the group of keys will produce.")])]),e._v(" "),t("p",[t("strong",[e._v("By sharing the same Descriptor, every compliant wallet will derive\ndeterministically the same series of multisig addresses")]),e._v(".")]),e._v(" "),t("p",[e._v("Imagine Alice using Bitcoin Core (from now on "),t("a",{attrs:{href:"https://bitcoincore.org/",target:"_blank",rel:"noopener noreferrer"}},[e._v('"Core"'),t("OutboundLink")],1),e._v(') as a\nWallet and Bob using a "Last generation" wallet, Bitcoin Development Kit\n(from now on '),t("a",{attrs:{href:"https://bitcoindevkit.org/",target:"_blank",rel:"noopener noreferrer"}},[e._v('"BDK"'),t("OutboundLink")],1),e._v("), which uses descriptors and miniscript natively.")]),e._v(" "),t("p",[e._v("Each of these two software wallets should be able to:")]),e._v(" "),t("ul",[t("li",[e._v("Create a new address which is seen as belonging to the multi signature\nwallet in both software")]),e._v(" "),t("li",[e._v("Express the consent of each party by partially signing the transaction in a way\nthe other wallet can understand and complete it with its own signature.")])]),e._v(" "),t("p",[e._v("The infrastructure of multiple Extended keys combined toghether to produce\nmultiple multisignature addresses is often referred as\n"),t("em",[t("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[e._v("Hierarchical Deterministic"),t("OutboundLink")],1),e._v(" multi signature wallet or HDM")]),e._v(".")]),e._v(" "),t("p",[e._v("What follows are the steps to create the HDM usable both in Core and\nin BDK.")]),e._v(" "),t("p",[t("em",[e._v("Note: In Core, "),t("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/pull/16528",target:"_blank",rel:"noopener noreferrer"}},[e._v("Descriptor wallets"),t("OutboundLink")],1),e._v(" are still experimental and in general,\nboth wallets should be tested for descriptor capabilities only in testnet.")])]),e._v(" "),t("h2",{attrs:{id:"our-playground"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#our-playground"}},[e._v("#")]),e._v(" Our playground")]),e._v(" "),t("p",[e._v("We will build a 2of2 key set up that will be used cooperatively by Bitcoin Core\nand Bitcoin Development Kit.\nThe steps Alice and Bob will do are:")]),e._v(" "),t("ol",[t("li",[e._v("creation of the seed and the derived Extended Master Public and send it to\nthe other party")]),e._v(" "),t("li",[e._v("Create the multi signature descriptor for each wallet")]),e._v(" "),t("li",[e._v("Use each other's software to receive testnet coins from a faucet")]),e._v(" "),t("li",[e._v("return part of the coins to the faucet signing the transaction with both\nwallets.")])]),e._v(" "),t("p",[e._v("We need:")]),e._v(" "),t("ul",[t("li",[t("a",{attrs:{href:"https://bitcoindevkit.org/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Bitcoin Dev Kit"),t("OutboundLink")],1)]),e._v(" "),t("li",[t("a",{attrs:{href:"https://bitcoincore.org/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Bitcoin Core"),t("OutboundLink")],1),e._v(" (v0.21.0 or later)")])]),e._v(" "),t("h3",{attrs:{id:"1-creating-the-seeds-and-the-derived-extended-public-keys"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#1-creating-the-seeds-and-the-derived-extended-public-keys"}},[e._v("#")]),e._v(" 1. Creating the seeds and the derived Extended Public keys")]),e._v(" "),t("h4",{attrs:{id:"seeds-and-extended-master-public"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#seeds-and-extended-master-public"}},[e._v("#")]),e._v(" Seeds and Extended Master Public")]),e._v(" "),t("p",[e._v("We build an Extended Private Master Key for both wallet and derive a BIP84\nExtended Master Public for Bitcoin Core and then for BDK.")]),e._v(" "),t("p",[e._v("For Bitcoin Core (Alice):")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("# new Extended wallet data\nexport core_key=$(bdk-cli key generate)\n\n# New Extended Master Private\n\nexport core_xprv=$(echo $core_key | jq -r '.xprv')\n\n# Now I derive the xpubs (one for receiving and one for the change)\n# together with informations about the derivation path to be communicated\n# to BDK wallet's owner (Bob).\n\nexport core_xpub_84_for_rec_desc=$(bdk-cli key derive --path m/84h/0h/0h/0 --xprv $core_xprv | jq -r '.xpub')\nexport core_xpub_84_for_chg_desc=$(bdk-cli key derive --path m/84h/0h/0h/1 --xprv $core_xprv | jq -r '.xpub')\n")])])]),t("p",[e._v("For BDK (Bob) we do the same:")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("# new Extended wallet data\n\nexport BDK_key=$(bdk-cli key generate)\n\n# New Extended Master Private\n\nexport BDK_xprv=$(echo $BDK_key | jq -r '.xprv')\n\n# Now I build the derived xpubs to be communicated (to Alice).\n\nexport BDK_xpub_84_for_rec_desc=$(bdk-cli key derive --path m/84h/0h/0h/0 --xprv $BDK_xprv | jq -r '.xpub')\nexport BDK_xpub_84_for_chg_desc=$(bdk-cli key derive --path m/84h/0h/0h/1 --xprv $BDK_xprv | jq -r '.xpub')\n")])])]),t("h3",{attrs:{id:"2-creation-of-the-multi-signature-descriptor-for-each-wallet"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#2-creation-of-the-multi-signature-descriptor-for-each-wallet"}},[e._v("#")]),e._v(" 2. Creation of the multi signature descriptor for each wallet")]),e._v(" "),t("p",[e._v("To build a multisig wallet, each wallet owner must compose the descriptor\nadding:")]),e._v(" "),t("ul",[t("li",[e._v("his derived extended "),t("strong",[e._v("private")]),e._v(" key AND")]),e._v(" "),t("li",[e._v("all the extended "),t("strong",[e._v("public")]),e._v(" keys of the other wallets involved in the\nmulti signature setup")])]),e._v(" "),t("p",[t("em",[e._v("The different nature of the two keys (one is private and one is public) is\ndue to the fact that each wallet, to be able to partially sign the transaction,\n"),t("strong",[e._v("must manage the private key of the wallet's owner")])]),e._v(" AND have the other\nparty's public key. Otherwise, if we put both public keys, we would obtain\na watch-only wallet unable to sign the transactions. If we\nhad both extended private keys inside the descriptor, we would allow each party\nto finalize the transactions autonomously.")]),e._v(" "),t("h4",{attrs:{id:"in-bitcoin-core"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#in-bitcoin-core"}},[e._v("#")]),e._v(" In Bitcoin Core:")]),e._v(" "),t("p",[e._v("In our case, the multi signature descriptor for Bitcoin Core will be composed\nwith:")]),e._v(" "),t("ul",[t("li",[e._v("The BIP84 derived Extended "),t("strong",[e._v("Public")]),e._v(" Key from BDK")]),e._v(" "),t("li",[e._v("The BIP84 derived Extended "),t("strong",[e._v("Private")]),e._v(" Key from Core.")])]),e._v(" "),t("p",[e._v("BDK wallet's owner will send to Core's owner the derived xpub for this purpose.\nThis is how the Core's multisig descriptor will be created and put into an\nenvironment variable:")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("export core_rec_desc=\"wsh(multi(2,$BDK_xpub_84_for_rec_desc,$core_xprv/84'/0'/0'/0/*))\"\n")])])]),t("p",[e._v("Where of course "),t("code",[e._v("$BDK_xpub_84_for_rec_desc")]),e._v("is the derived master public created\nin BDK and received by Core's owner.")]),e._v(" "),t("p",[e._v("The meaning of what is before and after is illustrated in the doc that explain\nthe use of "),t("a",{attrs:{href:"https://bitcoinops.org/en/topics/output-script-descriptors/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Output Descriptors in Bitcoin Core"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("We add the necessary checksum using the specific "),t("code",[e._v("bitcoin-cli")]),e._v(" call.")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("export core_rec_desc_chksum=$core_rec_desc#$(bitcoin-cli -testnet getdescriptorinfo $core_rec_desc | jq -r '.checksum')\n")])])]),t("p",[e._v("We repeat the same to build the descriptor to receive the change.")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("export core_chg_desc=\"wsh(multi(2,$BDK_xpub_84_for_chg_desc,$core_xprv/84'/0'/0'/1/*))\"\nexport core_chg_desc_chksum=$core_chg_desc#$(bitcoin-cli -testnet getdescriptorinfo $core_chg_desc|jq -r '.checksum')\n")])])]),t("h4",{attrs:{id:"in-bdk"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#in-bdk"}},[e._v("#")]),e._v(" In BDK:")]),e._v(" "),t("p",[e._v("For BDK we set the derivation for receiving addresses and change addresses\nin the command line (maybe setting an alias)")]),e._v(" "),t("p",[e._v("Building the descriptor:")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("export BDK_rec_desc=\"wsh(multi(2,$BDK_xprv/84'/0'/0'/0/*,$core_xpub_84_for_rec_desc))\"`\n")])])]),t("p",[e._v("Please note that the order of the extended key in the descriptor MUST be the\nsame in the 2 wallets.")]),e._v(" "),t("p",[t("em",[e._v("We have chosen to put BDK first and in each software wallet, the public key\nderived from BDK will always come first. In alternative, we could have chosen to\nproduce the descriptor, "),t("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/pull/17056?ref=tokendaily",target:"_blank",rel:"noopener noreferrer"}},[e._v("chosing a "),t("code",[e._v("soretedmulti")]),e._v(" multisignature setup"),t("OutboundLink")],1)]),e._v(".")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("export BDK_rec_desc_chksum=$BDK_rec_desc#$(bitcoin-cli -testnet getdescriptorinfo $BDK_rec_desc | jq -r '.checksum')\nexport BDK_chg_desc=\"wsh(multi(2,$BDK_xprv/84'/0'/0'/1/*,$core_xpub_84_for_chg_desc))\"\nexport BDK_chg_desc_chksum=$BDK_chg_desc#$(bitcoin-cli -testnet getdescriptorinfo $BDK_chg_desc | jq -r '.checksum')\n")])])]),t("p",[e._v("To take a look at the variables we have produced so far:")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("env | grep 'core_'\nenv | grep 'BDK_'\n")])])]),t("p",[e._v("Now we will use the multisig descriptor wallet to receive testnet coins with\nAlice and Bob's software")]),e._v(" "),t("h3",{attrs:{id:"3-use-each-others-software-to-receive-testnet-coins-from-a-faucet"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#3-use-each-others-software-to-receive-testnet-coins-from-a-faucet"}},[e._v("#")]),e._v(" 3. Use each other's software to receive testnet coins from a faucet")]),e._v(" "),t("h4",{attrs:{id:"in-bitcoin-core-2"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#in-bitcoin-core-2"}},[e._v("#")]),e._v(" In Bitcoin Core")]),e._v(" "),t("p",[e._v('Alice must create an empty, experimental new "descriptors wallet" in Core and\nto import the multisig Output Descriptor.')]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v('bitcoin-cli -testnet createwallet "multisig2of2withBDK" false true "" false true false\n')])])]),t("p",[e._v("The flag are to:")]),e._v(" "),t("ul",[t("li",[e._v("use the private keys")]),e._v(" "),t("li",[e._v("make it empty")]),e._v(" "),t("li",[e._v("no password provided to the wallet")]),e._v(" "),t("li",[e._v("reusing of addresses not allowed")]),e._v(" "),t("li",[e._v('"new experimental descriptors wallet"')]),e._v(" "),t("li",[e._v("don't load it on start up")])]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v('bitcoin-cli -testnet -rpcwallet=multisig2of2withBDK importdescriptors "[{\\"desc\\":\\"$core_rec_desc_chksum\\",\\"timestamp\\":\\"now\\",\\"active\\":true,\\"internal\\":false},{\\"desc\\":\\"$core_chg_desc_chksum\\",\\"timestamp\\":\\"now\\",\\"active\\":true,\\"internal\\":true}]"\n')])])]),t("p",[e._v("Now Alice asks for her first receiving multisignature address.")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("export first_address=$(bitcoin-cli -testnet -rpcwallet=multisig2of2withBDK getnewaddress)\necho $first_address\n")])])]),t("h4",{attrs:{id:"bdk"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#bdk"}},[e._v("#")]),e._v(" BDK")]),e._v(" "),t("p",[e._v("In BDK Bob can specify directly the descriptors on the command line to produce\nthe multisig address, because BDK is descriptors aware natively.")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v('repl -d "$BDK_rec_desc_chksum" -c "$BDK_chg_desc_chksum" -n testnet -w $BDK_fingerprint get_new_address`\n')])])]),t("p",[e._v('Et voilà: if we have done everything correctly, the newly created address in\nCore is the same of the newly created address in BDK. this is part of the\n"miracle" of descriptors\' interoperability.')]),e._v(" "),t("h4",{attrs:{id:"we-ask-for-testnet-coins-giving-the-first-created-address"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#we-ask-for-testnet-coins-giving-the-first-created-address"}},[e._v("#")]),e._v(" We ask for testnet coins giving the first created address.")]),e._v(" "),t("p",[e._v('To find testnet coins for free, you can just google "testnet faucet" and you\nshould find some satoshis to play with. Just give to the site your first\ngenerated address and, in twenty minutes, you will find the satoshis in\nyour balance both in Core and in BDK.')]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v('# to check it in Core:\n\nbitcoin-cli -testnet -rpcwallet=multisig2of2withBDK getbalance\n\n# In BDK:\n\n# Sync with the blockchain\nrepl -d "$BDK_rec_desc_chksum" -c "$BDK_chg_desc_chksum" -n testnet -w $BDK_fingerprint sync\n# Get the balance\nrepl -d "$BDK_rec_desc_chksum" -c "$BDK_chg_desc_chksum" -n testnet -w $BDK_fingerprint get_balance\n')])])]),t("p",[e._v("Some testnet faucets have an address to send back the unused satoshi after\nthe use. Take note of that because we will use it in the next step.")]),e._v(" "),t("h3",{attrs:{id:"4-we-return-part-of-the-satoshis-received-back-to-the-faucet"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#4-we-return-part-of-the-satoshis-received-back-to-the-faucet"}},[e._v("#")]),e._v(" 4. we return part of the satoshis received back to the faucet")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v('export psbt=$(bitcoin-cli -testnet -rpcwallet=multisig2of2withBDK walletcreatefundedpsbt "[]" "[{\\"tb1qrcesfj9f2d7x40xs6ztnlrcgxhh6vsw8658hjdhdy6qgkf6nfrds9rp79a\\":0.000012}]" | jq -r \'.psbt\')\n\nexport psbt=$(bitcoin-cli -testnet -rpcwallet=multisig2of2withBDK walletprocesspsbt $psbt | jq -r \'.psbt\')\n{\n "psbt": "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",\n "complete": false\n}\n')])])]),t("p",[e._v("Exactly! Note the "),t("code",[e._v('"complete": false')]),e._v(". We have processed the transaction with\nCore but we miss one of the necessary key of the multisig 2of2 setup (The one\ncontained inside BDK).")]),e._v(" "),t("p",[t("code",[e._v("tb1qrcesfj9f2d7x40xs6ztnlrcgxhh6vsw8658hjdhdy6qgkf6nfrds9rp79a")]),e._v(" is the address\nwe got from the faucet site to return the satoshis.")]),e._v(" "),t("p",[e._v("The "),t("a",{attrs:{href:"https://en.bitcoin.it/wiki/BIP_0174",target:"_blank",rel:"noopener noreferrer"}},[e._v("PSBT"),t("OutboundLink")],1),e._v(" is sent over to the BDK wallet owner who tries to sign the\ntransaction:")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v('repl -d "$BDK_rec_desc_chksum" -c "$BDK_chg_desc_chksum" -n testnet -w $BDK_fingerprint sign --psbt $psbt\n{\n "is_finalized": true,\n "psbt": "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"\n}\n')])])]),t("p",[e._v('The signature has succeded (note the "is_finalized": true,) and now we can\nbroadcast the transction.')]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v('repl -d "$BDK_rec_desc_chksum" -c "$BDK_chg_desc_chksum" -n testnet -w $BDK_fingerprint broadcast --psbt "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"\n{\n "txid": "a0b082e3b0579822d4a0b0fa95a4c4662f6b128ffd43fdcfe53c37473ce85dee"\n}\n')])])]),t("h2",{attrs:{id:"conclusion"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#conclusion"}},[e._v("#")]),e._v(" Conclusion")]),e._v(" "),t("p",[e._v("We have built an HDM and we have used it with two indipendent wallets, which\nare compatible with "),t("a",{attrs:{href:"https://en.bitcoin.it/wiki/BIP_0174",target:"_blank",rel:"noopener noreferrer"}},[e._v("BIP 174"),t("OutboundLink")],1),e._v(" and "),t("a",{attrs:{href:"https://bitcoinops.org/en/topics/output-script-descriptors/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Output Descriptors"),t("OutboundLink")],1),e._v(". Hopefully we\nwill see many other compatible wallets beyound "),t("a",{attrs:{href:"https://bitcoincore.org/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Bitcoin Core"),t("OutboundLink")],1),e._v(" and "),t("a",{attrs:{href:"https://bitcoindevkit.org/",target:"_blank",rel:"noopener noreferrer"}},[e._v("BDK"),t("OutboundLink")],1),e._v(",\nwith which we will be able to easily set up multi signature schemes.")])])}),[],!1,null,null,null);t.default=s.exports}}]); \ No newline at end of file diff --git a/assets/js/47.dce2d866.js b/assets/js/47.95bbbc17.js similarity index 99% rename from assets/js/47.dce2d866.js rename to assets/js/47.95bbbc17.js index fbbc0be411..c1e622d567 100644 --- a/assets/js/47.dce2d866.js +++ b/assets/js/47.95bbbc17.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[47],{396:function(e,t,a){"use strict";a.r(t);var o=a(7),n=Object(o.a)({},(function(){var e=this,t=e._self._c;return t("ContentSlotsDistributor",{attrs:{"slot-key":e.$parent.slotKey}},[t("p",[e._v("This post is part 1 of 3 of a series. ("),t("RouterLink",{attrs:{to:"/blog/2021/01/fee-estimation-for-light-clients-part-2/"}},[e._v("Part 2")]),e._v(", "),t("RouterLink",{attrs:{to:"/blog/2021/01/fee-estimation-for-light-clients-part-3/"}},[e._v("Part 3")]),e._v(")")],1),e._v(" "),t("ul",[t("li",[t("a",{attrs:{href:"#introduction-what-is-fee-estimation"}},[e._v("Introduction: what is fee estimation?")])]),e._v(" "),t("li",[t("a",{attrs:{href:"#the-problem"}},[e._v("The problem")]),e._v(" "),t("ul",[t("li",[t("a",{attrs:{href:"#the-challenges-and-the-solution"}},[e._v("The challenges and the solution")])]),e._v(" "),t("li",[t("a",{attrs:{href:"#the-question"}},[e._v("The question")])]),e._v(" "),t("li",[t("a",{attrs:{href:"#the-data-logger"}},[e._v("The data logger")])])])])]),e._v(" "),t("h2",{attrs:{id:"introduction-what-is-fee-estimation"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#introduction-what-is-fee-estimation"}},[e._v("#")]),e._v(" Introduction: what is fee estimation?")]),e._v(" "),t("p",[e._v("Fee estimation is the process of selecting the fee rate"),t("sup",{staticClass:"footnote-ref"},[t("a",{attrs:{href:"#fn1",id:"fnref1"}},[e._v("[1]")])]),e._v(" for a bitcoin transaction being created, according to two main factors:")]),e._v(" "),t("ul",[t("li",[e._v("The current congestion of the Bitcoin network.")]),e._v(" "),t("li",[e._v("The urgency, or lack thereof, for the transaction confirmation, i.e, its inclusion in a block.")])]),e._v(" "),t("p",[e._v("A fee rate should be adequate to the above factors: a fee too high would be a waste of money, because the same result could have been achieved with a lower expense. On the other hand, a fee rate too low would wait for a confirmation longer than planned or, even worse, the transaction could not be confirmed at all.")]),e._v(" "),t("h2",{attrs:{id:"the-problem"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#the-problem"}},[e._v("#")]),e._v(" The problem")]),e._v(" "),t("p",[e._v("Bitcoin Core offers fee estimation through the "),t("a",{attrs:{href:"https://bitcoincore.org/en/doc/0.20.0/rpc/util/estimatesmartfee/",target:"_blank",rel:"noopener noreferrer"}},[t("code",[e._v("estimatesmartfee")]),t("OutboundLink")],1),e._v(" RPC method, and there are also a lot of third-party "),t("a",{attrs:{href:"https://b10c.me/blog/003-a-list-of-public-bitcoin-feerate-estimation-apis/",target:"_blank",rel:"noopener noreferrer"}},[e._v("fee estimators"),t("OutboundLink")],1),e._v(" online, so do we need yet another estimator?")]),e._v(" "),t("p",[e._v("The model used by Bitcoin Core is not well suited for light-clients such as mobile wallets, even when running in pruned mode. Online estimators are lacking in terms of:")]),e._v(" "),t("ul",[t("li",[e._v("Privacy: Contacting the server leaks your IP (unless you are using Tor or a VPN), and the request timing may be used to correlate the request to a transaction broadcasted to the network soon thereafter.")]),e._v(" "),t("li",[e._v("Security: A malicious estimator could provide a high fee rate leading to a waste of money, or a low fee rate hampering the transaction confirmation.")])]),e._v(" "),t("p",[e._v("Replace By Fee (RBF) and Child Pays For Parent (CPFP) are techniques that can somewhat minimize the fee estimation problem, because one could simply underestimate the fee rate and then raise it when necessary, however:")]),e._v(" "),t("ul",[t("li",[e._v("RBF and CPFP may leak more information, such as patterns that may allow to detect the kind of wallet used, or which one of the transaction outputs is the change.")]),e._v(" "),t("li",[e._v('Requires additional interaction: the client must come back "online" to perform the fee bump. Sometimes this might be impractical or risky, for instance when using an offline signer or a multisignature with geographically distributed keys.')])]),e._v(" "),t("p",[e._v("Thus, this work is an effort to build a "),t("strong",[e._v("good fee estimator for purely peer to peer light clients")]),e._v(" such as "),t("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0157.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[e._v("neutrino"),t("OutboundLink")],1),e._v(" based ones, or at least determine whether the approach we take is infeasible and open the discussion\nfor other, better, models.")]),e._v(" "),t("p",[e._v("In the meantime, another sub-goal is pursued: attract the interest of data scientists; Indeed the initial step for this analysis consists in constructing a data set, which could also also help kickstart other studies on fee estimation or, more broadly, on the Bitcoin mempool.")]),e._v(" "),t("h4",{attrs:{id:"the-challenges-and-the-solution"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#the-challenges-and-the-solution"}},[e._v("#")]),e._v(" The challenges and the solution")]),e._v(" "),t("p",[e._v("The hardest part of doing fee estimation on a light client is the lack of information: for example, Bitcoin Core's "),t("code",[e._v("estimatesmartfee")]),e._v(" uses up to the last 1008 blocks and knows everything about the mempool"),t("sup",{staticClass:"footnote-ref"},[t("a",{attrs:{href:"#fn2",id:"fnref2"}},[e._v("[2]")])]),e._v(", such as the fee rate of every transaction it contains, but a light-client does not.")]),e._v(" "),t("p",[e._v("Also, there are other factors that may help doing fee estimation, such as the day of the week (the mempool usually empties during the "),t("a",{attrs:{href:"https://www.blockchainresearchlab.org/2020/03/30/a-week-with-bitcoin-transaction-timing-and-transaction-fees/",target:"_blank",rel:"noopener noreferrer"}},[e._v("weekend"),t("OutboundLink")],1),e._v(") or the time of the day to anticipate recurring daily events\n(such as the batch of "),t("a",{attrs:{href:"https://b10c.me/mempool-observations/2-bitmex-broadcast-13-utc/",target:"_blank",rel:"noopener noreferrer"}},[e._v("bitmex withdrawals"),t("OutboundLink")],1),e._v(").")]),e._v(" "),t("p",[e._v("The idea is to apply Machine Learning (ML) techniques"),t("sup",{staticClass:"footnote-ref"},[t("a",{attrs:{href:"#fn3",id:"fnref3"}},[e._v("[3]")])]),e._v(" to discover patterns over what a light-client knows and see if they are enough to achieve consistently good estimations.")]),e._v(" "),t("h4",{attrs:{id:"the-question"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#the-question"}},[e._v("#")]),e._v(" The question")]),e._v(" "),t("p",[e._v('We are going to use a DNN (Deep Neural Network), a ML technique in the supervised learning branch. The "ELI5" is: give a lot of example inputs and the desired output to a black box; if there are correlations between inputs and outputs,\nand there are enough examples, the black box will eventually start predicting the correct output even with inputs it has never seen before.')]),e._v(" "),t("p",[e._v("To define our inputs and outputs, we need to start from the question we want to answer. For a fee estimator this is:")]),e._v(" "),t("p",[t("em",[e._v('"Which minimum fee rate should I use if I want this transaction to be confirmed in at most '),t("code",[e._v("n")]),e._v(' blocks?"')])]),e._v(" "),t("p",[e._v("This can be translated to a table with many rows like:")]),e._v(" "),t("table",[t("thead",[t("tr",[t("th",[e._v("confirms_in")]),e._v(" "),t("th",[e._v("other_information")]),e._v(" "),t("th",[e._v("fee_rate")])])]),e._v(" "),t("tbody",[t("tr",[t("td",[e._v("1")]),e._v(" "),t("td",[e._v("...")]),e._v(" "),t("td",[e._v("100.34")])]),e._v(" "),t("tr",[t("td",[e._v("2")]),e._v(" "),t("td",[e._v("...")]),e._v(" "),t("td",[e._v("84.33")])]),e._v(" "),t("tr",[t("td",[e._v("10")]),e._v(" "),t("td",[e._v("...")]),e._v(" "),t("td",[e._v("44.44")])])])]),e._v(" "),t("p",[e._v("where the "),t("code",[e._v("fee_rate")]),e._v(' column is the output we want, also called the "'),t("em",[e._v("target")]),e._v('" or "'),t("em",[e._v("label")]),e._v('" in ML terminology, and the other columns are our inputs.')]),e._v(" "),t("p",[e._v("Can we build this table just by looking at the Bitcoin blockchain? Unfortunately, we can't:\nThe main thing that's missing is an indication of when the node first saw a transaction that has been later confirmed in a block. With that knowledge we can say that the fee rate of that transaction was the exact value required to confirm\nwithin the number of blocks it actually took to be confirmed. For instance, if we see transaction "),t("code",[e._v("t")]),e._v(" when the blockchain is at height "),t("code",[e._v("1000")]),e._v(" and then we notice that "),t("code",[e._v("t")]),e._v(" has been included in block "),t("code",[e._v("1006")]),e._v(", we can deduce that the\nfee rate paid by "),t("code",[e._v("t")]),e._v(" was the exact value required to get confirmed within the next "),t("code",[e._v("6")]),e._v(" blocks.")]),e._v(" "),t("p",[e._v("So to build our model, we first need to gather these data, and machine learning needs a "),t("em",[e._v("lot")]),e._v(" of data to work well.")]),e._v(" "),t("h4",{attrs:{id:"the-data-logger"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#the-data-logger"}},[e._v("#")]),e._v(" The data logger")]),e._v(" "),t("p",[e._v("The "),t("a",{attrs:{href:"https://github.com/RCasatta/bitcoin_logger",target:"_blank",rel:"noopener noreferrer"}},[e._v("data logger"),t("OutboundLink")],1),e._v(" is built with the purpose of collecting all the data we need, and it's MIT licensed open source software written in Rust.")]),e._v(" "),t("p",[e._v("We need to register the moment in time when transactions enter in the node's mempool; to be efficient and precise we should not only call the RPC endpoints but listen to "),t("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/blob/master/doc/zmq.md",target:"_blank",rel:"noopener noreferrer"}},[e._v("ZMQ"),t("OutboundLink")],1),e._v(" events. Luckily, the just released bitcoin core 0.21.0 added a new "),t("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/blob/master/doc/zmq.md",target:"_blank",rel:"noopener noreferrer"}},[e._v("ZMQ"),t("OutboundLink")],1),e._v(" topic "),t("code",[e._v("zmqpubsequence")]),e._v(" notifying mempool events (and block events). The logger is also listening to "),t("code",[e._v("zmqpubrawtx")]),e._v(" and "),t("code",[e._v("zmqpubrawblock")]),e._v(" topics, to make less RPC calls.")]),e._v(" "),t("p",[e._v("We are not only interested in the timestamp of the transaction entering the mempool, but also how many blocks it will take until the same transaction is confirmed.\nIn the final dataset this field is called "),t("code",[e._v("confirms_in")]),t("sup",{staticClass:"footnote-ref"},[t("a",{attrs:{href:"#fn4",id:"fnref4"}},[e._v("[4]")])]),e._v("; if "),t("code",[e._v("confirms_in = 1")]),e._v(" it means the transaction is confirmed in the first block created after it has been seen for the first time.")]),e._v(" "),t("p",[e._v("Another critical piece of information logged by the data logger is the "),t("code",[e._v("fee_rate")]),e._v(" of the transaction, since the absolute fee value paid by a bitcoin transaction is not available nor derivable given only the transaction itself, as the inputs don't have explicit amounts.")]),e._v(" "),t("p",[e._v("All these data (apart from the time of the transaction entering in the mempool) can actually be reconstructed simply by looking at the blockchain. However, querying the bitcoin node can be fairly slow, and during the model training iterations we want to recreate the ML dataset rapidly"),t("sup",{staticClass:"footnote-ref"},[t("a",{attrs:{href:"#fn5",id:"fnref5"}},[e._v("[5]")])]),e._v(", for example whenever we need to modify or add a new field.")]),e._v(" "),t("p",[e._v("For these reasons, the logger is split into two parts: a process listening to the events sent by our node, which creates raw logs, and then a second process that uses these logs to create the final CSV dataset.\nRaw logs are self-contained: for example, they contain all the previous transaction output values for every relevant transaction. This causes some redundancy, but in this case it's better to trade some efficiency for more performance\nwhen recreating the dataset.")]),e._v(" "),t("figure",[t("img",{attrs:{src:"/img/fee-estimation-for-light-clients/high-level-graph.svg",alt:"High level graph"}})]),e._v(" "),t("p",[e._v("My logger instance started collecting data on the 18th of December 2020, and as of today (25th January 2020), the raw logs are about 16GB.")]),e._v(" "),t("p",[e._v("I expect (or at least hope) the raw logs, the CSV dataset, or the data logger will be useful also for other projects as well, like monitoring the propagation of transactions or other works involving raw mempool data. We will share raw logs data through torrent soon.")]),e._v(" "),t("p",[e._v("In the following "),t("RouterLink",{attrs:{to:"/blog/2021/01/fee-estimation-for-light-clients-part-2/"}},[e._v("Part 2")]),e._v(" we are going to talk about the dataset.")],1),e._v(" "),t("hr",{staticClass:"footnotes-sep"}),e._v(" "),t("section",{staticClass:"footnotes"},[t("ol",{staticClass:"footnotes-list"},[t("li",{staticClass:"footnote-item",attrs:{id:"fn1"}},[t("p",[e._v("The transaction fee rate is the ratio between the absolute fee expressed in satoshi, over the weight of the transaction measured in virtual bytes. The weight of the transaction is similar to the byte size, however a part of the transaction (the segwit part) is discounted, their byte size is considered less because it creates less burden for the network. "),t("a",{staticClass:"footnote-backref",attrs:{href:"#fnref1"}},[e._v("↩︎")])])]),e._v(" "),t("li",{staticClass:"footnote-item",attrs:{id:"fn2"}},[t("p",[e._v("mempool is the set of transactions that are valid by consensus rules (for example, they are spending existing bitcoin), broadcasted in the bitcoin peer to peer network, but they are not yet part of the blockchain. "),t("a",{staticClass:"footnote-backref",attrs:{href:"#fnref2"}},[e._v("↩︎")])])]),e._v(" "),t("li",{staticClass:"footnote-item",attrs:{id:"fn3"}},[t("p",[e._v("DISCLAIMER: I am not an expert data-scientist! "),t("a",{staticClass:"footnote-backref",attrs:{href:"#fnref3"}},[e._v("↩︎")])])]),e._v(" "),t("li",{staticClass:"footnote-item",attrs:{id:"fn4"}},[t("p",[e._v("Conceptually similar to bitcoin core "),t("code",[e._v("estimatesmartfee")]),e._v(' parameter called "blocks target", however, '),t("code",[e._v("confirms_in")]),e._v(" is the real value not the desired target. "),t("a",{staticClass:"footnote-backref",attrs:{href:"#fnref4"}},[e._v("↩︎")])])]),e._v(" "),t("li",{staticClass:"footnote-item",attrs:{id:"fn5"}},[t("p",[e._v("16GB of compressed raw logs are processed and a compressed CSV produced in about 5 minutes. "),t("a",{staticClass:"footnote-backref",attrs:{href:"#fnref5"}},[e._v("↩︎")])])])])])])}),[],!1,null,null,null);t.default=n.exports}}]); \ No newline at end of file +(window.webpackJsonp=window.webpackJsonp||[]).push([[47],{395:function(e,t,a){"use strict";a.r(t);var o=a(7),n=Object(o.a)({},(function(){var e=this,t=e._self._c;return t("ContentSlotsDistributor",{attrs:{"slot-key":e.$parent.slotKey}},[t("p",[e._v("This post is part 1 of 3 of a series. ("),t("RouterLink",{attrs:{to:"/blog/2021/01/fee-estimation-for-light-clients-part-2/"}},[e._v("Part 2")]),e._v(", "),t("RouterLink",{attrs:{to:"/blog/2021/01/fee-estimation-for-light-clients-part-3/"}},[e._v("Part 3")]),e._v(")")],1),e._v(" "),t("ul",[t("li",[t("a",{attrs:{href:"#introduction-what-is-fee-estimation"}},[e._v("Introduction: what is fee estimation?")])]),e._v(" "),t("li",[t("a",{attrs:{href:"#the-problem"}},[e._v("The problem")]),e._v(" "),t("ul",[t("li",[t("a",{attrs:{href:"#the-challenges-and-the-solution"}},[e._v("The challenges and the solution")])]),e._v(" "),t("li",[t("a",{attrs:{href:"#the-question"}},[e._v("The question")])]),e._v(" "),t("li",[t("a",{attrs:{href:"#the-data-logger"}},[e._v("The data logger")])])])])]),e._v(" "),t("h2",{attrs:{id:"introduction-what-is-fee-estimation"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#introduction-what-is-fee-estimation"}},[e._v("#")]),e._v(" Introduction: what is fee estimation?")]),e._v(" "),t("p",[e._v("Fee estimation is the process of selecting the fee rate"),t("sup",{staticClass:"footnote-ref"},[t("a",{attrs:{href:"#fn1",id:"fnref1"}},[e._v("[1]")])]),e._v(" for a bitcoin transaction being created, according to two main factors:")]),e._v(" "),t("ul",[t("li",[e._v("The current congestion of the Bitcoin network.")]),e._v(" "),t("li",[e._v("The urgency, or lack thereof, for the transaction confirmation, i.e, its inclusion in a block.")])]),e._v(" "),t("p",[e._v("A fee rate should be adequate to the above factors: a fee too high would be a waste of money, because the same result could have been achieved with a lower expense. On the other hand, a fee rate too low would wait for a confirmation longer than planned or, even worse, the transaction could not be confirmed at all.")]),e._v(" "),t("h2",{attrs:{id:"the-problem"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#the-problem"}},[e._v("#")]),e._v(" The problem")]),e._v(" "),t("p",[e._v("Bitcoin Core offers fee estimation through the "),t("a",{attrs:{href:"https://bitcoincore.org/en/doc/0.20.0/rpc/util/estimatesmartfee/",target:"_blank",rel:"noopener noreferrer"}},[t("code",[e._v("estimatesmartfee")]),t("OutboundLink")],1),e._v(" RPC method, and there are also a lot of third-party "),t("a",{attrs:{href:"https://b10c.me/blog/003-a-list-of-public-bitcoin-feerate-estimation-apis/",target:"_blank",rel:"noopener noreferrer"}},[e._v("fee estimators"),t("OutboundLink")],1),e._v(" online, so do we need yet another estimator?")]),e._v(" "),t("p",[e._v("The model used by Bitcoin Core is not well suited for light-clients such as mobile wallets, even when running in pruned mode. Online estimators are lacking in terms of:")]),e._v(" "),t("ul",[t("li",[e._v("Privacy: Contacting the server leaks your IP (unless you are using Tor or a VPN), and the request timing may be used to correlate the request to a transaction broadcasted to the network soon thereafter.")]),e._v(" "),t("li",[e._v("Security: A malicious estimator could provide a high fee rate leading to a waste of money, or a low fee rate hampering the transaction confirmation.")])]),e._v(" "),t("p",[e._v("Replace By Fee (RBF) and Child Pays For Parent (CPFP) are techniques that can somewhat minimize the fee estimation problem, because one could simply underestimate the fee rate and then raise it when necessary, however:")]),e._v(" "),t("ul",[t("li",[e._v("RBF and CPFP may leak more information, such as patterns that may allow to detect the kind of wallet used, or which one of the transaction outputs is the change.")]),e._v(" "),t("li",[e._v('Requires additional interaction: the client must come back "online" to perform the fee bump. Sometimes this might be impractical or risky, for instance when using an offline signer or a multisignature with geographically distributed keys.')])]),e._v(" "),t("p",[e._v("Thus, this work is an effort to build a "),t("strong",[e._v("good fee estimator for purely peer to peer light clients")]),e._v(" such as "),t("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0157.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[e._v("neutrino"),t("OutboundLink")],1),e._v(" based ones, or at least determine whether the approach we take is infeasible and open the discussion\nfor other, better, models.")]),e._v(" "),t("p",[e._v("In the meantime, another sub-goal is pursued: attract the interest of data scientists; Indeed the initial step for this analysis consists in constructing a data set, which could also also help kickstart other studies on fee estimation or, more broadly, on the Bitcoin mempool.")]),e._v(" "),t("h4",{attrs:{id:"the-challenges-and-the-solution"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#the-challenges-and-the-solution"}},[e._v("#")]),e._v(" The challenges and the solution")]),e._v(" "),t("p",[e._v("The hardest part of doing fee estimation on a light client is the lack of information: for example, Bitcoin Core's "),t("code",[e._v("estimatesmartfee")]),e._v(" uses up to the last 1008 blocks and knows everything about the mempool"),t("sup",{staticClass:"footnote-ref"},[t("a",{attrs:{href:"#fn2",id:"fnref2"}},[e._v("[2]")])]),e._v(", such as the fee rate of every transaction it contains, but a light-client does not.")]),e._v(" "),t("p",[e._v("Also, there are other factors that may help doing fee estimation, such as the day of the week (the mempool usually empties during the "),t("a",{attrs:{href:"https://www.blockchainresearchlab.org/2020/03/30/a-week-with-bitcoin-transaction-timing-and-transaction-fees/",target:"_blank",rel:"noopener noreferrer"}},[e._v("weekend"),t("OutboundLink")],1),e._v(") or the time of the day to anticipate recurring daily events\n(such as the batch of "),t("a",{attrs:{href:"https://b10c.me/mempool-observations/2-bitmex-broadcast-13-utc/",target:"_blank",rel:"noopener noreferrer"}},[e._v("bitmex withdrawals"),t("OutboundLink")],1),e._v(").")]),e._v(" "),t("p",[e._v("The idea is to apply Machine Learning (ML) techniques"),t("sup",{staticClass:"footnote-ref"},[t("a",{attrs:{href:"#fn3",id:"fnref3"}},[e._v("[3]")])]),e._v(" to discover patterns over what a light-client knows and see if they are enough to achieve consistently good estimations.")]),e._v(" "),t("h4",{attrs:{id:"the-question"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#the-question"}},[e._v("#")]),e._v(" The question")]),e._v(" "),t("p",[e._v('We are going to use a DNN (Deep Neural Network), a ML technique in the supervised learning branch. The "ELI5" is: give a lot of example inputs and the desired output to a black box; if there are correlations between inputs and outputs,\nand there are enough examples, the black box will eventually start predicting the correct output even with inputs it has never seen before.')]),e._v(" "),t("p",[e._v("To define our inputs and outputs, we need to start from the question we want to answer. For a fee estimator this is:")]),e._v(" "),t("p",[t("em",[e._v('"Which minimum fee rate should I use if I want this transaction to be confirmed in at most '),t("code",[e._v("n")]),e._v(' blocks?"')])]),e._v(" "),t("p",[e._v("This can be translated to a table with many rows like:")]),e._v(" "),t("table",[t("thead",[t("tr",[t("th",[e._v("confirms_in")]),e._v(" "),t("th",[e._v("other_information")]),e._v(" "),t("th",[e._v("fee_rate")])])]),e._v(" "),t("tbody",[t("tr",[t("td",[e._v("1")]),e._v(" "),t("td",[e._v("...")]),e._v(" "),t("td",[e._v("100.34")])]),e._v(" "),t("tr",[t("td",[e._v("2")]),e._v(" "),t("td",[e._v("...")]),e._v(" "),t("td",[e._v("84.33")])]),e._v(" "),t("tr",[t("td",[e._v("10")]),e._v(" "),t("td",[e._v("...")]),e._v(" "),t("td",[e._v("44.44")])])])]),e._v(" "),t("p",[e._v("where the "),t("code",[e._v("fee_rate")]),e._v(' column is the output we want, also called the "'),t("em",[e._v("target")]),e._v('" or "'),t("em",[e._v("label")]),e._v('" in ML terminology, and the other columns are our inputs.')]),e._v(" "),t("p",[e._v("Can we build this table just by looking at the Bitcoin blockchain? Unfortunately, we can't:\nThe main thing that's missing is an indication of when the node first saw a transaction that has been later confirmed in a block. With that knowledge we can say that the fee rate of that transaction was the exact value required to confirm\nwithin the number of blocks it actually took to be confirmed. For instance, if we see transaction "),t("code",[e._v("t")]),e._v(" when the blockchain is at height "),t("code",[e._v("1000")]),e._v(" and then we notice that "),t("code",[e._v("t")]),e._v(" has been included in block "),t("code",[e._v("1006")]),e._v(", we can deduce that the\nfee rate paid by "),t("code",[e._v("t")]),e._v(" was the exact value required to get confirmed within the next "),t("code",[e._v("6")]),e._v(" blocks.")]),e._v(" "),t("p",[e._v("So to build our model, we first need to gather these data, and machine learning needs a "),t("em",[e._v("lot")]),e._v(" of data to work well.")]),e._v(" "),t("h4",{attrs:{id:"the-data-logger"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#the-data-logger"}},[e._v("#")]),e._v(" The data logger")]),e._v(" "),t("p",[e._v("The "),t("a",{attrs:{href:"https://github.com/RCasatta/bitcoin_logger",target:"_blank",rel:"noopener noreferrer"}},[e._v("data logger"),t("OutboundLink")],1),e._v(" is built with the purpose of collecting all the data we need, and it's MIT licensed open source software written in Rust.")]),e._v(" "),t("p",[e._v("We need to register the moment in time when transactions enter in the node's mempool; to be efficient and precise we should not only call the RPC endpoints but listen to "),t("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/blob/master/doc/zmq.md",target:"_blank",rel:"noopener noreferrer"}},[e._v("ZMQ"),t("OutboundLink")],1),e._v(" events. Luckily, the just released bitcoin core 0.21.0 added a new "),t("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/blob/master/doc/zmq.md",target:"_blank",rel:"noopener noreferrer"}},[e._v("ZMQ"),t("OutboundLink")],1),e._v(" topic "),t("code",[e._v("zmqpubsequence")]),e._v(" notifying mempool events (and block events). The logger is also listening to "),t("code",[e._v("zmqpubrawtx")]),e._v(" and "),t("code",[e._v("zmqpubrawblock")]),e._v(" topics, to make less RPC calls.")]),e._v(" "),t("p",[e._v("We are not only interested in the timestamp of the transaction entering the mempool, but also how many blocks it will take until the same transaction is confirmed.\nIn the final dataset this field is called "),t("code",[e._v("confirms_in")]),t("sup",{staticClass:"footnote-ref"},[t("a",{attrs:{href:"#fn4",id:"fnref4"}},[e._v("[4]")])]),e._v("; if "),t("code",[e._v("confirms_in = 1")]),e._v(" it means the transaction is confirmed in the first block created after it has been seen for the first time.")]),e._v(" "),t("p",[e._v("Another critical piece of information logged by the data logger is the "),t("code",[e._v("fee_rate")]),e._v(" of the transaction, since the absolute fee value paid by a bitcoin transaction is not available nor derivable given only the transaction itself, as the inputs don't have explicit amounts.")]),e._v(" "),t("p",[e._v("All these data (apart from the time of the transaction entering in the mempool) can actually be reconstructed simply by looking at the blockchain. However, querying the bitcoin node can be fairly slow, and during the model training iterations we want to recreate the ML dataset rapidly"),t("sup",{staticClass:"footnote-ref"},[t("a",{attrs:{href:"#fn5",id:"fnref5"}},[e._v("[5]")])]),e._v(", for example whenever we need to modify or add a new field.")]),e._v(" "),t("p",[e._v("For these reasons, the logger is split into two parts: a process listening to the events sent by our node, which creates raw logs, and then a second process that uses these logs to create the final CSV dataset.\nRaw logs are self-contained: for example, they contain all the previous transaction output values for every relevant transaction. This causes some redundancy, but in this case it's better to trade some efficiency for more performance\nwhen recreating the dataset.")]),e._v(" "),t("figure",[t("img",{attrs:{src:"/img/fee-estimation-for-light-clients/high-level-graph.svg",alt:"High level graph"}})]),e._v(" "),t("p",[e._v("My logger instance started collecting data on the 18th of December 2020, and as of today (25th January 2020), the raw logs are about 16GB.")]),e._v(" "),t("p",[e._v("I expect (or at least hope) the raw logs, the CSV dataset, or the data logger will be useful also for other projects as well, like monitoring the propagation of transactions or other works involving raw mempool data. We will share raw logs data through torrent soon.")]),e._v(" "),t("p",[e._v("In the following "),t("RouterLink",{attrs:{to:"/blog/2021/01/fee-estimation-for-light-clients-part-2/"}},[e._v("Part 2")]),e._v(" we are going to talk about the dataset.")],1),e._v(" "),t("hr",{staticClass:"footnotes-sep"}),e._v(" "),t("section",{staticClass:"footnotes"},[t("ol",{staticClass:"footnotes-list"},[t("li",{staticClass:"footnote-item",attrs:{id:"fn1"}},[t("p",[e._v("The transaction fee rate is the ratio between the absolute fee expressed in satoshi, over the weight of the transaction measured in virtual bytes. The weight of the transaction is similar to the byte size, however a part of the transaction (the segwit part) is discounted, their byte size is considered less because it creates less burden for the network. "),t("a",{staticClass:"footnote-backref",attrs:{href:"#fnref1"}},[e._v("↩︎")])])]),e._v(" "),t("li",{staticClass:"footnote-item",attrs:{id:"fn2"}},[t("p",[e._v("mempool is the set of transactions that are valid by consensus rules (for example, they are spending existing bitcoin), broadcasted in the bitcoin peer to peer network, but they are not yet part of the blockchain. "),t("a",{staticClass:"footnote-backref",attrs:{href:"#fnref2"}},[e._v("↩︎")])])]),e._v(" "),t("li",{staticClass:"footnote-item",attrs:{id:"fn3"}},[t("p",[e._v("DISCLAIMER: I am not an expert data-scientist! "),t("a",{staticClass:"footnote-backref",attrs:{href:"#fnref3"}},[e._v("↩︎")])])]),e._v(" "),t("li",{staticClass:"footnote-item",attrs:{id:"fn4"}},[t("p",[e._v("Conceptually similar to bitcoin core "),t("code",[e._v("estimatesmartfee")]),e._v(' parameter called "blocks target", however, '),t("code",[e._v("confirms_in")]),e._v(" is the real value not the desired target. "),t("a",{staticClass:"footnote-backref",attrs:{href:"#fnref4"}},[e._v("↩︎")])])]),e._v(" "),t("li",{staticClass:"footnote-item",attrs:{id:"fn5"}},[t("p",[e._v("16GB of compressed raw logs are processed and a compressed CSV produced in about 5 minutes. "),t("a",{staticClass:"footnote-backref",attrs:{href:"#fnref5"}},[e._v("↩︎")])])])])])])}),[],!1,null,null,null);t.default=n.exports}}]); \ No newline at end of file diff --git a/assets/js/48.f74437f6.js b/assets/js/48.8de2893d.js similarity index 99% rename from assets/js/48.f74437f6.js rename to assets/js/48.8de2893d.js index fc72b1b1ab..22cfb24b9d 100644 --- a/assets/js/48.f74437f6.js +++ b/assets/js/48.8de2893d.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[48],{398:function(e,t,a){"use strict";a.r(t);var o=a(7),n=Object(o.a)({},(function(){var e=this,t=e._self._c;return t("ContentSlotsDistributor",{attrs:{"slot-key":e.$parent.slotKey}},[t("p",[e._v("This post is part 2 of 3 of a series. ("),t("RouterLink",{attrs:{to:"/blog/2021/01/fee-estimation-for-light-clients-part-1/"}},[e._v("Part 1")]),e._v(", "),t("RouterLink",{attrs:{to:"/blog/2021/01/fee-estimation-for-light-clients-part-3/"}},[e._v("Part 3")]),e._v(")")],1),e._v(" "),t("ul",[t("li",[t("a",{attrs:{href:"#the-dataset"}},[e._v("The dataset")]),e._v(" "),t("ul",[t("li",[t("a",{attrs:{href:"#the-mempool"}},[e._v("The mempool")])]),e._v(" "),t("li",[t("a",{attrs:{href:"#the-outliers"}},[e._v("The outliers")])]),e._v(" "),t("li",[t("a",{attrs:{href:"#recap"}},[e._v("Recap")])])])])]),e._v(" "),t("h2",{attrs:{id:"the-dataset"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#the-dataset"}},[e._v("#")]),e._v(" The dataset")]),e._v(" "),t("p",[e._v("The "),t("a",{attrs:{href:"https://storage.googleapis.com/bitcoin_log/dataset_18.csv.gz",target:"_blank",rel:"noopener noreferrer"}},[e._v("dataset"),t("OutboundLink")],1),e._v(" is publicly available (~500MB gzip compressed, ~2GB as plain CSV).")]),e._v(" "),t("p",[e._v("The output of the model is the fee rate, expressed in "),t("code",[e._v("[satoshi/vbytes]")]),e._v(".")]),e._v(" "),t("p",[e._v("What about the inputs? Generally speaking, we have two main requirements for what can be included as input for our model:")]),e._v(" "),t("ul",[t("li",[e._v("It must be correlated to the output, even with a non-linear relation.")]),e._v(" "),t("li",[e._v("It must be available to a light client: for instance, assuming to have knowledge and an index of the last 1000 blocks is considered too much.")])]),e._v(" "),t("p",[e._v("To evaluate the approach we are taking, we also want to compare our model's results with another available estimation: for this reason the dataset includes data to compute the error agains Bitcoin Core's "),t("code",[e._v("estimatesmartfee")]),e._v(" results, even though we are not going to use it for this model.")]),e._v(" "),t("p",[e._v("The dataset will contain only transactions that spend already confirmed inputs. If we wanted to include transactions with unconfirmed inputs as well, the fee rate would have to be computed as a whole;\nfor example if transaction "),t("code",[e._v("t2")]),e._v(" spends an unconfirmed input from "),t("code",[e._v("t1")]),e._v(" (while "),t("code",[e._v("t1")]),e._v(" only spends confirmed inputs, and all its other outputs are unspent), the aggregated fee rate would have to be used.\nSupposing "),t("code",[e._v("f()")]),e._v(" is extracts the absolute fee and "),t("code",[e._v("w()")]),e._v(" the transaction weight, the aggregated fee rate would be "),t("code",[e._v("(f(t1) + f(t2)) / (w(t1) + w(t2))")]),e._v(". Thus, as already said previously, to keep things simple the model simply discards all the transaction\nthat would need to perform this computation.")]),e._v(" "),t("p",[e._v("For the same reason the dataset has the "),t("code",[e._v("parent_in_cpfp")]),e._v(" flag. When a transaction has inputs confirmed (so it's not excluded by the previous rule) but one or more of its output have been spent by a transaction confirmed in the same block, "),t("code",[e._v("parent_in_cpfp")]),e._v(" is "),t("code",[e._v("1")]),e._v(".\nTransactions with "),t("code",[e._v("parent_in_cpfp = 1")]),e._v(" are included in the dataset but excluded by the current model, since the miner probably considered an aggregated fee rate while picking the transactions to build a block.")]),e._v(" "),t("h4",{attrs:{id:"the-mempool"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#the-mempool"}},[e._v("#")]),e._v(" The mempool")]),e._v(" "),t("p",[e._v("The most important input of our model is the current "),t("em",[e._v("status")]),e._v(' of the mempool itself. However, we cannot feed the model with a list of the fee rate of every unconfirmed transaction, because this array would have a variable length.\nTo overcome this, the transaction contained in the mempool are grouped in "buckets" which are basically subsets of the mempool where all the transactions contained in a bucket have a similar fee rate. In particular we only care about the\n'),t("em",[e._v("number")]),e._v(" of transaction in every "),t("em",[e._v("bucket")]),e._v(", not which transactions it contains.")]),e._v(" "),t("p",[e._v("The mempool buckets array is defined by two parameters, the "),t("code",[e._v("percentage_increment")]),e._v(" and the "),t("code",[e._v("array_max")]),e._v(" value.\nStarting from the minimum fee rate value "),t("code",[e._v("min_relay_fee=1.0")]),e._v(", the "),t("code",[e._v("ith")]),e._v(" element is: "),t("code",[e._v("a_i=min_relay_fee * (1+percentage_increment)^(i+1)")])]),e._v(" "),t("p",[e._v("For instance, choosing the mempool buckets array to have parameters "),t("code",[e._v("percentage_increment = 50%")]),e._v(" and "),t("code",[e._v("array_max = 500.0 sat/vbytes")]),e._v(" the buckets would be constructed like so:")]),e._v(" "),t("table",[t("thead",[t("tr",[t("th",[e._v("bucket")]),e._v(" "),t("th",[e._v("bucket min fee rate")]),e._v(" "),t("th",[e._v("bucket max fee rate")])])]),e._v(" "),t("tbody",[t("tr",[t("td",[e._v("a_0")]),e._v(" "),t("td",[e._v("1.0")]),e._v(" "),t("td",[e._v("1.5")])]),e._v(" "),t("tr",[t("td",[e._v("a_1")]),e._v(" "),t("td",[e._v("1.5")]),e._v(" "),t("td",[e._v("2.25")])]),e._v(" "),t("tr",[t("td",[e._v("a_2")]),e._v(" "),t("td",[e._v("2.25")]),e._v(" "),t("td",[e._v("3.375")])]),e._v(" "),t("tr",[t("td",[e._v("a_15")]),e._v(" "),t("td",[e._v("437.89")]),e._v(" "),t("td",[e._v("inf")])])])]),e._v(" "),t("p",[e._v("The array stops at "),t("code",[e._v("a15")]),e._v(" because "),t("code",[e._v("a16")]),e._v(" would have a bucket min greater than "),t("code",[e._v("array_max")]),e._v(".")]),e._v(" "),t("p",[e._v("The model is for light-client such as "),t("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0157.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[e._v("neutrino"),t("OutboundLink")],1),e._v(" based ones. In these clients the mempool is already available (it's needed to check for received transactions) but we can't compute fee rates of this transactions because previous confirmed inputs are not in the mempool!")]),e._v(" "),t("p",[e._v("Luckily, "),t("strong",[e._v("thanks to temporal locality "),t("sup",{staticClass:"footnote-ref"},[t("a",{attrs:{href:"#fn1",id:"fnref1"}},[e._v("[1]")])]),e._v(", an important part of mempool transactions spend outputs created very recently")]),e._v(", for example in the last 6 blocks.\nThe blocks are available through the p2p network, and downloading the last 6 is considered a good compromise between resource consumption and accurate prediction. We need the model to be built with the same data available in the prediction phase, as a consequence "),t("em",[e._v("the mempool data in the dataset refers only to transactions having their inputs in the last 6 blocks")]),e._v(". However the "),t("code",[e._v("bitcoin-csv")]),e._v(" tool inside the "),t("a",{attrs:{href:"https://github.com/RCasatta/bitcoin_logger",target:"_blank",rel:"noopener noreferrer"}},[e._v("data logger"),t("OutboundLink")],1),e._v(" allows to configure this parameter.")]),e._v(" "),t("h4",{attrs:{id:"the-outliers"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#the-outliers"}},[e._v("#")]),e._v(" The outliers")]),e._v(" "),t("p",[e._v("The dataset also contains the block percentile fee rate "),t("code",[e._v("q_k")]),e._v(", considering "),t("code",[e._v("r_i")]),e._v(" to be the rate of the "),t("code",[e._v("ith")]),e._v(" transaction in a block, "),t("code",[e._v("q_k")]),e._v(" is the fee rate value such that for each transaction in a block "),t("code",[e._v("r_i")]),e._v(" < "),t("code",[e._v("q_k")]),e._v(" returns the "),t("code",[e._v("k%")]),e._v(" transactions in the block that are paying lower fees.")]),e._v(" "),t("p",[e._v("Percentiles are not used to feed the model but to filter some outliers tx.\nRemoving this observations is controversial at best and considered cheating at worse. However, it should be considered that Bitcoin Core "),t("code",[e._v("estimatesmartfee")]),e._v(" doesn't even bother to give estimation for the next block, we think this is due to the fact that many transactions that are confirming in the next block are huge overestimation, or clearly errors like "),t("a",{attrs:{href:"https://blockstream.info/tx/33291156ab79e9b4a1019b618b0acfa18cbdf8fa6b71c43a9eed62a849b86f9a",target:"_blank",rel:"noopener noreferrer"}},[e._v("this one"),t("OutboundLink")],1),e._v(" we found when we started logging data.\nThese outliers are several for transactions confirming in the next block ("),t("code",[e._v("confirms_in=1")]),e._v("), less so for "),t("code",[e._v("confirms_in=2")]),e._v(", mostly disappeared for "),t("code",[e._v("confirms_in=3")]),e._v(" or more. It's counterintuitive that overestimation exists for "),t("code",[e._v("confirms_in>1")]),e._v(", by definition an overestimation is a fee rate way higher than needed, so how is possible that an overestimation doesn't enter the very next block? There are a couple of reasons why a block is discovered without containing a transaction with high fee rate:")]),e._v(" "),t("ul",[t("li",[e._v("network latency: my node saw the transaction but the miner didn't see that transaction yet,")]),e._v(" "),t("li",[e._v("block building latency: the miner saw the transaction, but didn't finish to rebuild the block template or decided it's more efficient to finish a cycle on the older block template.")])]),e._v(" "),t("p",[e._v("To keep the model balanced, when overestimation is filtered out, underestimation are filtered out as well. This also has the effect to remove some of the transactions possibly included because a fee is payed out-of-band.\nAnother reason to filter transactions is that the dataset is over-represented by transactions with low "),t("code",[e._v("confirms_in")]),e._v(": more than 50% of transactions get confirmed in the next block, so we think it's good to filter some of these transactions.")]),e._v(" "),t("p",[e._v("The applied filters are the following:")]),e._v(" "),t("table",[t("thead",[t("tr",[t("th",[e._v("confirms_in")]),e._v(" "),t("th",[e._v("lower")]),e._v(" "),t("th",[e._v("higher")])])]),e._v(" "),t("tbody",[t("tr",[t("td",[e._v("1")]),e._v(" "),t("td",[e._v("q45")]),e._v(" "),t("td",[e._v("q55")])]),e._v(" "),t("tr",[t("td",[e._v("2")]),e._v(" "),t("td",[e._v("q30")]),e._v(" "),t("td",[e._v("q70")])]),e._v(" "),t("tr",[t("td",[e._v("3")]),e._v(" "),t("td",[e._v("q1")]),e._v(" "),t("td",[e._v("q99")])])])]),e._v(" "),t("p",[e._v("Not yet convinced by the removal of these outliers? The "),t("a",{attrs:{href:"https://storage.googleapis.com/bitcoin_log/dataset_18.csv.gz",target:"_blank",rel:"noopener noreferrer"}},[e._v("dataset"),t("OutboundLink")],1),e._v(" contains all the observations, make your model 😃")]),e._v(" "),t("h4",{attrs:{id:"recap"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#recap"}},[e._v("#")]),e._v(" Recap")]),e._v(" "),t("table",[t("thead",[t("tr",[t("th",[e._v("column")]),e._v(" "),t("th",[e._v("used in the model")]),e._v(" "),t("th",[e._v("description")])])]),e._v(" "),t("tbody",[t("tr",[t("td",[e._v("txid")]),e._v(" "),t("td",[e._v("no")]),e._v(" "),t("td",[e._v("Transaction hash, useful for debugging")])]),e._v(" "),t("tr",[t("td",[e._v("timestamp")]),e._v(" "),t("td",[e._v("converted")]),e._v(" "),t("td",[e._v("The time when the transaction has been added in the mempool, in the model is used in the form "),t("code",[e._v("day_of_week")]),e._v(" and "),t("code",[e._v("hour")])])]),e._v(" "),t("tr",[t("td",[e._v("current_height")]),e._v(" "),t("td",[e._v("no")]),e._v(" "),t("td",[e._v("The blockchain height seen by the node in this moment")])]),e._v(" "),t("tr",[t("td",[e._v("confirms_in")]),e._v(" "),t("td",[e._v("yes")]),e._v(" "),t("td",[e._v("This transaction confirmed at block height "),t("code",[e._v("current_height+confirms_in")])])]),e._v(" "),t("tr",[t("td",[e._v("fee_rate")]),e._v(" "),t("td",[e._v("target")]),e._v(" "),t("td",[e._v("This transaction fee rate measured in "),t("code",[e._v("[sat/vbytes]")])])]),e._v(" "),t("tr",[t("td",[e._v("fee_rate_bytes")]),e._v(" "),t("td",[e._v("no")]),e._v(" "),t("td",[e._v("fee rate in satoshi / bytes, used to check Bitcoin Core "),t("code",[e._v("estimatesmartfee")]),e._v(" predictions")])]),e._v(" "),t("tr",[t("td",[e._v("block_avg_fee")]),e._v(" "),t("td",[e._v("no")]),e._v(" "),t("td",[e._v("block average fee rate "),t("code",[e._v("[sat/vbytes]")]),e._v(" of block "),t("code",[e._v("current_height+confirms_in")])])]),e._v(" "),t("tr",[t("td",[e._v("core_econ")]),e._v(" "),t("td",[e._v("no")]),e._v(" "),t("td",[e._v("bitcoin "),t("code",[e._v("estimatesmartfee")]),e._v(" result for "),t("code",[e._v("confirms_in")]),e._v(" block target and in economic mode. Could be not available "),t("code",[e._v("?")]),e._v(" when a block is connected more recently than the estimation has been requested, estimation are requested every 10 secs.")])]),e._v(" "),t("tr",[t("td",[e._v("core_cons")]),e._v(" "),t("td",[e._v("no")]),e._v(" "),t("td",[e._v("Same as above but with conservative mode")])]),e._v(" "),t("tr",[t("td",[e._v("mempool_len")]),e._v(" "),t("td",[e._v("no")]),e._v(" "),t("td",[e._v("Sum of the mempool transactions with fee rate available (sum of every "),t("code",[e._v("a*")]),e._v(" field)")])]),e._v(" "),t("tr",[t("td",[e._v("parent_in_cpfp")]),e._v(" "),t("td",[e._v("no")]),e._v(" "),t("td",[e._v("It's 1 when the transaction has outputs that are spent in the same block in which the transaction is confirmed (they are parent in a CPFP relations).")])]),e._v(" "),t("tr",[t("td",[e._v("q1-q30-...")]),e._v(" "),t("td",[e._v("no")]),e._v(" "),t("td",[e._v("Transaction confirming fast could be outliers, usually paying a lot more than required, this percentiles are used to filter those transactions,")])]),e._v(" "),t("tr",[t("td",[e._v("a1-a2-...")]),e._v(" "),t("td",[e._v("yes")]),e._v(" "),t("td",[e._v("Contains the number of transaction in the mempool with known fee rate in the ith bucket.")])])])]),e._v(" "),t("p",[t("img",{attrs:{src:"/img/fee-estimation-for-light-clients/the-good-the-bad-the-ugly.jpg",alt:"The good, the bad and the ugly"}})]),t("div",{attrs:{align:"center"}},[e._v('My biological neural network fired this, I think it\'s because a lot of chapters start with "The"')]),e._v(" "),t("br"),t("br"),t("p"),e._v(" "),t("p",[e._v("In the previous "),t("RouterLink",{attrs:{to:"/blog/2021/01/fee-estimation-for-light-clients-part-1/"}},[e._v("Part 1")]),e._v(" we talked about the problem.")],1),e._v(" "),t("p",[e._v("In the following "),t("RouterLink",{attrs:{to:"/blog/2021/01/fee-estimation-for-light-clients-part-3/"}},[e._v("Part 3")]),e._v(" we are going to talk about the model.")],1),e._v(" "),t("hr",{staticClass:"footnotes-sep"}),e._v(" "),t("section",{staticClass:"footnotes"},[t("ol",{staticClass:"footnotes-list"},[t("li",{staticClass:"footnote-item",attrs:{id:"fn1"}},[t("p",[e._v("In computer science temporal locality refers to the tendency to access recent data more often than older data. "),t("a",{staticClass:"footnote-backref",attrs:{href:"#fnref1"}},[e._v("↩︎")])])])])])])}),[],!1,null,null,null);t.default=n.exports}}]); \ No newline at end of file +(window.webpackJsonp=window.webpackJsonp||[]).push([[48],{397:function(e,t,a){"use strict";a.r(t);var o=a(7),n=Object(o.a)({},(function(){var e=this,t=e._self._c;return t("ContentSlotsDistributor",{attrs:{"slot-key":e.$parent.slotKey}},[t("p",[e._v("This post is part 2 of 3 of a series. ("),t("RouterLink",{attrs:{to:"/blog/2021/01/fee-estimation-for-light-clients-part-1/"}},[e._v("Part 1")]),e._v(", "),t("RouterLink",{attrs:{to:"/blog/2021/01/fee-estimation-for-light-clients-part-3/"}},[e._v("Part 3")]),e._v(")")],1),e._v(" "),t("ul",[t("li",[t("a",{attrs:{href:"#the-dataset"}},[e._v("The dataset")]),e._v(" "),t("ul",[t("li",[t("a",{attrs:{href:"#the-mempool"}},[e._v("The mempool")])]),e._v(" "),t("li",[t("a",{attrs:{href:"#the-outliers"}},[e._v("The outliers")])]),e._v(" "),t("li",[t("a",{attrs:{href:"#recap"}},[e._v("Recap")])])])])]),e._v(" "),t("h2",{attrs:{id:"the-dataset"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#the-dataset"}},[e._v("#")]),e._v(" The dataset")]),e._v(" "),t("p",[e._v("The "),t("a",{attrs:{href:"https://storage.googleapis.com/bitcoin_log/dataset_18.csv.gz",target:"_blank",rel:"noopener noreferrer"}},[e._v("dataset"),t("OutboundLink")],1),e._v(" is publicly available (~500MB gzip compressed, ~2GB as plain CSV).")]),e._v(" "),t("p",[e._v("The output of the model is the fee rate, expressed in "),t("code",[e._v("[satoshi/vbytes]")]),e._v(".")]),e._v(" "),t("p",[e._v("What about the inputs? Generally speaking, we have two main requirements for what can be included as input for our model:")]),e._v(" "),t("ul",[t("li",[e._v("It must be correlated to the output, even with a non-linear relation.")]),e._v(" "),t("li",[e._v("It must be available to a light client: for instance, assuming to have knowledge and an index of the last 1000 blocks is considered too much.")])]),e._v(" "),t("p",[e._v("To evaluate the approach we are taking, we also want to compare our model's results with another available estimation: for this reason the dataset includes data to compute the error agains Bitcoin Core's "),t("code",[e._v("estimatesmartfee")]),e._v(" results, even though we are not going to use it for this model.")]),e._v(" "),t("p",[e._v("The dataset will contain only transactions that spend already confirmed inputs. If we wanted to include transactions with unconfirmed inputs as well, the fee rate would have to be computed as a whole;\nfor example if transaction "),t("code",[e._v("t2")]),e._v(" spends an unconfirmed input from "),t("code",[e._v("t1")]),e._v(" (while "),t("code",[e._v("t1")]),e._v(" only spends confirmed inputs, and all its other outputs are unspent), the aggregated fee rate would have to be used.\nSupposing "),t("code",[e._v("f()")]),e._v(" is extracts the absolute fee and "),t("code",[e._v("w()")]),e._v(" the transaction weight, the aggregated fee rate would be "),t("code",[e._v("(f(t1) + f(t2)) / (w(t1) + w(t2))")]),e._v(". Thus, as already said previously, to keep things simple the model simply discards all the transaction\nthat would need to perform this computation.")]),e._v(" "),t("p",[e._v("For the same reason the dataset has the "),t("code",[e._v("parent_in_cpfp")]),e._v(" flag. When a transaction has inputs confirmed (so it's not excluded by the previous rule) but one or more of its output have been spent by a transaction confirmed in the same block, "),t("code",[e._v("parent_in_cpfp")]),e._v(" is "),t("code",[e._v("1")]),e._v(".\nTransactions with "),t("code",[e._v("parent_in_cpfp = 1")]),e._v(" are included in the dataset but excluded by the current model, since the miner probably considered an aggregated fee rate while picking the transactions to build a block.")]),e._v(" "),t("h4",{attrs:{id:"the-mempool"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#the-mempool"}},[e._v("#")]),e._v(" The mempool")]),e._v(" "),t("p",[e._v("The most important input of our model is the current "),t("em",[e._v("status")]),e._v(' of the mempool itself. However, we cannot feed the model with a list of the fee rate of every unconfirmed transaction, because this array would have a variable length.\nTo overcome this, the transaction contained in the mempool are grouped in "buckets" which are basically subsets of the mempool where all the transactions contained in a bucket have a similar fee rate. In particular we only care about the\n'),t("em",[e._v("number")]),e._v(" of transaction in every "),t("em",[e._v("bucket")]),e._v(", not which transactions it contains.")]),e._v(" "),t("p",[e._v("The mempool buckets array is defined by two parameters, the "),t("code",[e._v("percentage_increment")]),e._v(" and the "),t("code",[e._v("array_max")]),e._v(" value.\nStarting from the minimum fee rate value "),t("code",[e._v("min_relay_fee=1.0")]),e._v(", the "),t("code",[e._v("ith")]),e._v(" element is: "),t("code",[e._v("a_i=min_relay_fee * (1+percentage_increment)^(i+1)")])]),e._v(" "),t("p",[e._v("For instance, choosing the mempool buckets array to have parameters "),t("code",[e._v("percentage_increment = 50%")]),e._v(" and "),t("code",[e._v("array_max = 500.0 sat/vbytes")]),e._v(" the buckets would be constructed like so:")]),e._v(" "),t("table",[t("thead",[t("tr",[t("th",[e._v("bucket")]),e._v(" "),t("th",[e._v("bucket min fee rate")]),e._v(" "),t("th",[e._v("bucket max fee rate")])])]),e._v(" "),t("tbody",[t("tr",[t("td",[e._v("a_0")]),e._v(" "),t("td",[e._v("1.0")]),e._v(" "),t("td",[e._v("1.5")])]),e._v(" "),t("tr",[t("td",[e._v("a_1")]),e._v(" "),t("td",[e._v("1.5")]),e._v(" "),t("td",[e._v("2.25")])]),e._v(" "),t("tr",[t("td",[e._v("a_2")]),e._v(" "),t("td",[e._v("2.25")]),e._v(" "),t("td",[e._v("3.375")])]),e._v(" "),t("tr",[t("td",[e._v("a_15")]),e._v(" "),t("td",[e._v("437.89")]),e._v(" "),t("td",[e._v("inf")])])])]),e._v(" "),t("p",[e._v("The array stops at "),t("code",[e._v("a15")]),e._v(" because "),t("code",[e._v("a16")]),e._v(" would have a bucket min greater than "),t("code",[e._v("array_max")]),e._v(".")]),e._v(" "),t("p",[e._v("The model is for light-client such as "),t("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0157.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[e._v("neutrino"),t("OutboundLink")],1),e._v(" based ones. In these clients the mempool is already available (it's needed to check for received transactions) but we can't compute fee rates of this transactions because previous confirmed inputs are not in the mempool!")]),e._v(" "),t("p",[e._v("Luckily, "),t("strong",[e._v("thanks to temporal locality "),t("sup",{staticClass:"footnote-ref"},[t("a",{attrs:{href:"#fn1",id:"fnref1"}},[e._v("[1]")])]),e._v(", an important part of mempool transactions spend outputs created very recently")]),e._v(", for example in the last 6 blocks.\nThe blocks are available through the p2p network, and downloading the last 6 is considered a good compromise between resource consumption and accurate prediction. We need the model to be built with the same data available in the prediction phase, as a consequence "),t("em",[e._v("the mempool data in the dataset refers only to transactions having their inputs in the last 6 blocks")]),e._v(". However the "),t("code",[e._v("bitcoin-csv")]),e._v(" tool inside the "),t("a",{attrs:{href:"https://github.com/RCasatta/bitcoin_logger",target:"_blank",rel:"noopener noreferrer"}},[e._v("data logger"),t("OutboundLink")],1),e._v(" allows to configure this parameter.")]),e._v(" "),t("h4",{attrs:{id:"the-outliers"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#the-outliers"}},[e._v("#")]),e._v(" The outliers")]),e._v(" "),t("p",[e._v("The dataset also contains the block percentile fee rate "),t("code",[e._v("q_k")]),e._v(", considering "),t("code",[e._v("r_i")]),e._v(" to be the rate of the "),t("code",[e._v("ith")]),e._v(" transaction in a block, "),t("code",[e._v("q_k")]),e._v(" is the fee rate value such that for each transaction in a block "),t("code",[e._v("r_i")]),e._v(" < "),t("code",[e._v("q_k")]),e._v(" returns the "),t("code",[e._v("k%")]),e._v(" transactions in the block that are paying lower fees.")]),e._v(" "),t("p",[e._v("Percentiles are not used to feed the model but to filter some outliers tx.\nRemoving this observations is controversial at best and considered cheating at worse. However, it should be considered that Bitcoin Core "),t("code",[e._v("estimatesmartfee")]),e._v(" doesn't even bother to give estimation for the next block, we think this is due to the fact that many transactions that are confirming in the next block are huge overestimation, or clearly errors like "),t("a",{attrs:{href:"https://blockstream.info/tx/33291156ab79e9b4a1019b618b0acfa18cbdf8fa6b71c43a9eed62a849b86f9a",target:"_blank",rel:"noopener noreferrer"}},[e._v("this one"),t("OutboundLink")],1),e._v(" we found when we started logging data.\nThese outliers are several for transactions confirming in the next block ("),t("code",[e._v("confirms_in=1")]),e._v("), less so for "),t("code",[e._v("confirms_in=2")]),e._v(", mostly disappeared for "),t("code",[e._v("confirms_in=3")]),e._v(" or more. It's counterintuitive that overestimation exists for "),t("code",[e._v("confirms_in>1")]),e._v(", by definition an overestimation is a fee rate way higher than needed, so how is possible that an overestimation doesn't enter the very next block? There are a couple of reasons why a block is discovered without containing a transaction with high fee rate:")]),e._v(" "),t("ul",[t("li",[e._v("network latency: my node saw the transaction but the miner didn't see that transaction yet,")]),e._v(" "),t("li",[e._v("block building latency: the miner saw the transaction, but didn't finish to rebuild the block template or decided it's more efficient to finish a cycle on the older block template.")])]),e._v(" "),t("p",[e._v("To keep the model balanced, when overestimation is filtered out, underestimation are filtered out as well. This also has the effect to remove some of the transactions possibly included because a fee is payed out-of-band.\nAnother reason to filter transactions is that the dataset is over-represented by transactions with low "),t("code",[e._v("confirms_in")]),e._v(": more than 50% of transactions get confirmed in the next block, so we think it's good to filter some of these transactions.")]),e._v(" "),t("p",[e._v("The applied filters are the following:")]),e._v(" "),t("table",[t("thead",[t("tr",[t("th",[e._v("confirms_in")]),e._v(" "),t("th",[e._v("lower")]),e._v(" "),t("th",[e._v("higher")])])]),e._v(" "),t("tbody",[t("tr",[t("td",[e._v("1")]),e._v(" "),t("td",[e._v("q45")]),e._v(" "),t("td",[e._v("q55")])]),e._v(" "),t("tr",[t("td",[e._v("2")]),e._v(" "),t("td",[e._v("q30")]),e._v(" "),t("td",[e._v("q70")])]),e._v(" "),t("tr",[t("td",[e._v("3")]),e._v(" "),t("td",[e._v("q1")]),e._v(" "),t("td",[e._v("q99")])])])]),e._v(" "),t("p",[e._v("Not yet convinced by the removal of these outliers? The "),t("a",{attrs:{href:"https://storage.googleapis.com/bitcoin_log/dataset_18.csv.gz",target:"_blank",rel:"noopener noreferrer"}},[e._v("dataset"),t("OutboundLink")],1),e._v(" contains all the observations, make your model 😃")]),e._v(" "),t("h4",{attrs:{id:"recap"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#recap"}},[e._v("#")]),e._v(" Recap")]),e._v(" "),t("table",[t("thead",[t("tr",[t("th",[e._v("column")]),e._v(" "),t("th",[e._v("used in the model")]),e._v(" "),t("th",[e._v("description")])])]),e._v(" "),t("tbody",[t("tr",[t("td",[e._v("txid")]),e._v(" "),t("td",[e._v("no")]),e._v(" "),t("td",[e._v("Transaction hash, useful for debugging")])]),e._v(" "),t("tr",[t("td",[e._v("timestamp")]),e._v(" "),t("td",[e._v("converted")]),e._v(" "),t("td",[e._v("The time when the transaction has been added in the mempool, in the model is used in the form "),t("code",[e._v("day_of_week")]),e._v(" and "),t("code",[e._v("hour")])])]),e._v(" "),t("tr",[t("td",[e._v("current_height")]),e._v(" "),t("td",[e._v("no")]),e._v(" "),t("td",[e._v("The blockchain height seen by the node in this moment")])]),e._v(" "),t("tr",[t("td",[e._v("confirms_in")]),e._v(" "),t("td",[e._v("yes")]),e._v(" "),t("td",[e._v("This transaction confirmed at block height "),t("code",[e._v("current_height+confirms_in")])])]),e._v(" "),t("tr",[t("td",[e._v("fee_rate")]),e._v(" "),t("td",[e._v("target")]),e._v(" "),t("td",[e._v("This transaction fee rate measured in "),t("code",[e._v("[sat/vbytes]")])])]),e._v(" "),t("tr",[t("td",[e._v("fee_rate_bytes")]),e._v(" "),t("td",[e._v("no")]),e._v(" "),t("td",[e._v("fee rate in satoshi / bytes, used to check Bitcoin Core "),t("code",[e._v("estimatesmartfee")]),e._v(" predictions")])]),e._v(" "),t("tr",[t("td",[e._v("block_avg_fee")]),e._v(" "),t("td",[e._v("no")]),e._v(" "),t("td",[e._v("block average fee rate "),t("code",[e._v("[sat/vbytes]")]),e._v(" of block "),t("code",[e._v("current_height+confirms_in")])])]),e._v(" "),t("tr",[t("td",[e._v("core_econ")]),e._v(" "),t("td",[e._v("no")]),e._v(" "),t("td",[e._v("bitcoin "),t("code",[e._v("estimatesmartfee")]),e._v(" result for "),t("code",[e._v("confirms_in")]),e._v(" block target and in economic mode. Could be not available "),t("code",[e._v("?")]),e._v(" when a block is connected more recently than the estimation has been requested, estimation are requested every 10 secs.")])]),e._v(" "),t("tr",[t("td",[e._v("core_cons")]),e._v(" "),t("td",[e._v("no")]),e._v(" "),t("td",[e._v("Same as above but with conservative mode")])]),e._v(" "),t("tr",[t("td",[e._v("mempool_len")]),e._v(" "),t("td",[e._v("no")]),e._v(" "),t("td",[e._v("Sum of the mempool transactions with fee rate available (sum of every "),t("code",[e._v("a*")]),e._v(" field)")])]),e._v(" "),t("tr",[t("td",[e._v("parent_in_cpfp")]),e._v(" "),t("td",[e._v("no")]),e._v(" "),t("td",[e._v("It's 1 when the transaction has outputs that are spent in the same block in which the transaction is confirmed (they are parent in a CPFP relations).")])]),e._v(" "),t("tr",[t("td",[e._v("q1-q30-...")]),e._v(" "),t("td",[e._v("no")]),e._v(" "),t("td",[e._v("Transaction confirming fast could be outliers, usually paying a lot more than required, this percentiles are used to filter those transactions,")])]),e._v(" "),t("tr",[t("td",[e._v("a1-a2-...")]),e._v(" "),t("td",[e._v("yes")]),e._v(" "),t("td",[e._v("Contains the number of transaction in the mempool with known fee rate in the ith bucket.")])])])]),e._v(" "),t("p",[t("img",{attrs:{src:"/img/fee-estimation-for-light-clients/the-good-the-bad-the-ugly.jpg",alt:"The good, the bad and the ugly"}})]),t("div",{attrs:{align:"center"}},[e._v('My biological neural network fired this, I think it\'s because a lot of chapters start with "The"')]),e._v(" "),t("br"),t("br"),t("p"),e._v(" "),t("p",[e._v("In the previous "),t("RouterLink",{attrs:{to:"/blog/2021/01/fee-estimation-for-light-clients-part-1/"}},[e._v("Part 1")]),e._v(" we talked about the problem.")],1),e._v(" "),t("p",[e._v("In the following "),t("RouterLink",{attrs:{to:"/blog/2021/01/fee-estimation-for-light-clients-part-3/"}},[e._v("Part 3")]),e._v(" we are going to talk about the model.")],1),e._v(" "),t("hr",{staticClass:"footnotes-sep"}),e._v(" "),t("section",{staticClass:"footnotes"},[t("ol",{staticClass:"footnotes-list"},[t("li",{staticClass:"footnote-item",attrs:{id:"fn1"}},[t("p",[e._v("In computer science temporal locality refers to the tendency to access recent data more often than older data. "),t("a",{staticClass:"footnote-backref",attrs:{href:"#fnref1"}},[e._v("↩︎")])])])])])])}),[],!1,null,null,null);t.default=n.exports}}]); \ No newline at end of file diff --git a/assets/js/50.73103c2e.js b/assets/js/50.ca89fc9f.js similarity index 99% rename from assets/js/50.73103c2e.js rename to assets/js/50.ca89fc9f.js index c55b72f9ea..222bd5dbec 100644 --- a/assets/js/50.73103c2e.js +++ b/assets/js/50.ca89fc9f.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[50],{400:function(e,t,s){"use strict";s.r(t);var n=s(7),a=Object(n.a)({},(function(){var e=this,t=e._self._c;return t("ContentSlotsDistributor",{attrs:{"slot-key":e.$parent.slotKey}},[t("p",[e._v("This is the first of a two-parts blog series in which I will try to explain all the changes that I made to BDK (and some of its dependencies) to make our "),t("a",{attrs:{href:"https://twitter.com/afilini/status/1459763243556163584",target:"_blank",rel:"noopener noreferrer"}},[e._v("first Taproot transaction in mainnet"),t("OutboundLink")],1),e._v(", which also\nturned out to be "),t("a",{attrs:{href:"https://twitter.com/afilini/status/1459774394054725634",target:"_blank",rel:"noopener noreferrer"}},[e._v("the first ever use of the new "),t("code",[e._v("OP_CHECKSIGADD")]),e._v(" opcode"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("Hopefully this will give an insight into what kind of changes need to be made to a wallet in order to support spending "),t("code",[e._v("P2TR")]),e._v(" outputs, both with key-spend and script-spend. BDK actually delegates\nmost of the hard work to "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-miniscript",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust-miniscript"),t("OutboundLink")],1),e._v(", and luckily most of the Taproot code was already implemented by the time I started working on it. I only had to patch a few little bugs here and there, and it ended up\nworking flawlessly in the end.")]),e._v(" "),t("p",[e._v("In this first part I will focus on the changes made to our dependencies, "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-bitcoin",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust-bitcoin"),t("OutboundLink")],1),e._v(" and "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-miniscript",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust-miniscript"),t("OutboundLink")],1),e._v(". In the second part I will talk about BDK itself.")]),e._v(" "),t("h2",{attrs:{id:"backstory"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#backstory"}},[e._v("#")]),e._v(" Backstory")]),e._v(" "),t("p",[e._v("On the evening of Thursday, November 11th I was attending our weekly "),t("a",{attrs:{href:"https://www.satoshispritz.com/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Satoshi Spritz"),t("OutboundLink")],1),e._v(" meetup in Milan. The activation of Taproot was right around the corner, and naturally that was the main discussion\ntopic that night. The activation was forecasted for the early afternoon of Sunday, November 14th, a little less than 72h later.")]),e._v(" "),t("p",[e._v("I began to wonder how hard it would be to patch BDK and add support for Taproot. I knew most of the work had already been done in our main dependencies, "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-bitcoin",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust-bitcoin"),t("OutboundLink")],1),e._v(" and "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-miniscript",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust-miniscript"),t("OutboundLink")],1),e._v(", and so I decided\nto challenge myself: could I make it in time for the activation?")]),e._v(" "),t("p",[e._v('The following day I started digging into the topic. It didn\'t help that up until that time I only had a rather "high level" idea of how Taproot worked, but luckily all the BIPs were very well written and\nstraightforward to understand.')]),e._v(" "),t("p",[e._v("By Friday night (or rather, early Saturday morning) "),t("a",{attrs:{href:"https://mempool.space/signet/tx/ba0ebb350717701ca4ea109aadfbaf3058f6cd73e5ece3927ddee653de06cf5a",target:"_blank",rel:"noopener noreferrer"}},[e._v("I had Taproot key-spend working"),t("OutboundLink")],1),e._v(", which made me pretty optimistic even though the activation date was actually moving closer, now being forecasted for\nSunday "),t("em",[e._v("morning")]),e._v(".")]),e._v(" "),t("p",[e._v("After a few hours of sleep I went back to work and by early Saturday afternoon "),t("a",{attrs:{href:"https://mempool.space/signet/tx/41d7d49f9f4edffa9ca88ad6fb887fbf1ae68f9f31def267fdb3a5949f766bf5",target:"_blank",rel:"noopener noreferrer"}},[e._v("I had Taproot script-spend working as well"),t("OutboundLink")],1),e._v(". This left me a few hours to coordinate with some friends and "),t("a",{attrs:{href:"https://mempool.space/address/1Taproote7gvQGKz5g982ecSbPvqJhMUf",target:"_blank",rel:"noopener noreferrer"}},[e._v("generate a vanity address"),t("OutboundLink")],1),e._v("\nto deposit funds into temporarily, as we didn't trust sending them to Taproot addresses before the activation (as they were anyone-can-spend according to the pre-activation rules).")]),e._v(" "),t("p",[e._v("After another pretty short night, I woke up a 5:30 AM on Sunday to monitor the activation. I broadcasted our transactions shortly after 6:00 AM as the activation block was being mined. Unfortunately, the first\nthree blocks that were enforcing Taproot rules "),t("a",{attrs:{href:"https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2021-November/019598.html",target:"_blank",rel:"noopener noreferrer"}},[e._v("didn't include any Taproot transaction"),t("OutboundLink")],1),e._v(", which indicates that the miners weren't actually running the new Bitcoin Core 22.0 nodes. The fourth block, mined by "),t("code",[e._v("Foundry USA")]),e._v(" "),t("a",{attrs:{href:"https://mempool.space/tx/2eb8dbaa346d4be4e82fe444c2f0be00654d8cfd8c4a9a61b11aeaab8c00b272",target:"_blank",rel:"noopener noreferrer"}},[e._v("included my transaction"),t("OutboundLink")],1),e._v(" and "),t("a",{attrs:{href:"https://twitter.com/achow101/status/1459760452775387136?s=20",target:"_blank",rel:"noopener noreferrer"}},[e._v("a few others"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("In the end our transaction was the third Taproot script-spend in the block, but the first to use the new "),t("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0342.mediawiki#script-execution",target:"_blank",rel:"noopener noreferrer"}},[t("code",[e._v("OP_CHECKSIGADD")]),t("OutboundLink")],1),e._v(" opcode, as the two preceding it were respectively "),t("a",{attrs:{href:"https://mempool.space/tx/37777defed8717c581b4c0509329550e344bdc14ac38f71fc050096887e535c8",target:"_blank",rel:"noopener noreferrer"}},[e._v("a single-sig"),t("OutboundLink")],1),e._v(" and "),t("a",{attrs:{href:"https://mempool.space/tx/905ecdf95a84804b192f4dc221cfed4d77959b81ed66013a7e41a6e61e7ed530",target:"_blank",rel:"noopener noreferrer"}},[e._v("a 2-of-2 multisig"),t("OutboundLink")],1),e._v("\nscript, made with with two "),t("code",[e._v("OP_CHECKSIG(VERIFY)")]),e._v("s.")]),e._v(" "),t("p",[e._v("Now, with the context out of the way, we can begin talking about the code!")]),e._v(" "),t("h2",{attrs:{id:"rust-bitcoin"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#rust-bitcoin"}},[e._v("#")]),e._v(" rust-bitcoin")]),e._v(" "),t("p",[e._v("The first dependency I had to update was "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-bitcoin",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust-bitcoin"),t("OutboundLink")],1),e._v(". Most of the taproot stuff were already merged in "),t("code",[e._v("master")]),e._v(" (altough they hadn't been released yet). One notable missing part was the support for "),t("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0371.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[t("code",[e._v("BIP371")]),t("OutboundLink")],1),e._v(",\nwhich is an extension of "),t("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0174.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[t("code",[e._v("BIP174")]),t("OutboundLink")],1),e._v(", aka the "),t("code",[e._v("Partially Signed Bitcoin Transaction")]),e._v(" BIP. This new BIP defines a few new fields that are required to properly handle Taproot transactions.")]),e._v(" "),t("p",[e._v("Luckily most of the work had already been done by "),t("a",{attrs:{href:"https://twitter.com/sanket1729",target:"_blank",rel:"noopener noreferrer"}},[e._v("sanket1729"),t("OutboundLink")],1),e._v(", so I forked his branch and made only few very minor changes, just to expose a structure that I will have to use later which in his code wasn't public.")]),e._v(" "),t("p",[e._v("You can find all the commits mentioned here in "),t("a",{attrs:{href:"https://github.com/afilini/rust-bitcoin/tree/taproot-testing",target:"_blank",rel:"noopener noreferrer"}},[e._v("my rust-bitcoin "),t("code",[e._v("taproot-testing")]),e._v(" branch"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("$ git diff 187234f f830df9\n")])])]),t("div",{staticClass:"language-diff extra-class"},[t("pre",{pre:!0,attrs:{class:"language-diff"}},[t("code",[e._v("diff --git a/src/lib.rs b/src/lib.rs\nindex 87d9c36..d5e5802 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/lib.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/lib.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("@@ -54,7 +54,6 @@")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("#![deny(unused_mut)]\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("#![deny(dead_code)]\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("#![deny(unused_imports)]\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("#![deny(missing_docs)]\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("#![deny(unused_must_use)]\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("#![deny(broken_intra_doc_links)]\n")])]),e._v("\ndiff --git a/src/util/taproot.rs b/src/util/taproot.rs\nindex 674eeee..3d56cbc 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/util/taproot.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/util/taproot.rs")]),e._v("\n@@ -440,7 +440,7 @@ impl TaprootBuilder {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" 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unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" /// Merkle Hash for this node\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" pub(crate) hash: sha256::Hash,\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" /// information about leaves inside this node\n")])]),e._v("@@ -448,8 +448,12 @@ pub(crate) struct NodeInfo {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("}\n")])]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("impl NodeInfo {\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" pub fn hash(&self) -> &sha256::Hash {\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" &self.hash\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // Create a new NodeInfo with omitted/hidden info\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" fn new_hidden(hash: sha256::Hash) -> Self {\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" pub fn new_hidden(hash: sha256::Hash) -> Self {\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Self {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" hash: hash,\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" leaves: vec![],\n")])]),e._v("@@ -457,7 +461,7 @@ impl NodeInfo {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")])]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // Create a new leaf with NodeInfo\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" fn new_leaf_with_ver(script: Script, ver: LeafVersion) -> Self {\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" pub fn new_leaf_with_ver(script: Script, ver: LeafVersion) -> Self {\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let leaf = LeafInfo::new(script, ver);\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Self {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" hash: leaf.hash(),\n")])]),e._v("@@ -466,7 +470,7 @@ impl NodeInfo {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")])]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // Combine two NodeInfo's to create a new parent\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" fn combine(a: Self, b: Self) -> Result {\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" pub fn combine(a: Self, b: Self) -> Result {\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let mut all_leaves = Vec::with_capacity(a.leaves.len() + b.leaves.len());\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" for mut a_leaf in a.leaves {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" a_leaf.merkle_branch.push(b.hash)?; // add hashing partner\n")])]),e._v("\n")])])]),t("p",[e._v("There isn't much to explain here: I disabled the "),t("code",[e._v("missing_docs")]),e._v(" lint so that the compiler wouldn't complain about the new public methods that aren't documented.\nThen, I added a getter for the "),t("code",[e._v("hash")]),e._v(" field of "),t("code",[e._v("NodeInfo")]),e._v(" and made the struct itself and a bunch of methods public.")]),e._v(" "),t("p",[e._v('We will use this structure later to recover the merkle root of a Taproot script tree, given one leaf and the other "hidden" branches.')]),e._v(" "),t("h2",{attrs:{id:"rust-miniscript"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#rust-miniscript"}},[e._v("#")]),e._v(" rust-miniscript")]),e._v(" "),t("p",[e._v("Moving on to "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-miniscript",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust-miniscript"),t("OutboundLink")],1),e._v(': once again, most of the work required to support Taproot had already been done, but this time I was working with very "early" prototype-like code, so I was prepared to\nmake some changes to the code to get it to work how I wanted.')]),e._v(" "),t("p",[e._v("Instead of showing one big diff I will talk about the commits individually, which I think will help making more clear what I was doing.")]),e._v(" "),t("p",[e._v("Once again, you can find all the commits referenced here in "),t("a",{attrs:{href:"https://github.com/afilini/rust-miniscript/tree/taproot",target:"_blank",rel:"noopener noreferrer"}},[e._v("my rust-miniscript "),t("code",[e._v("taproot")]),e._v(" branch"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("$ git show 34cf15b\n")])])]),t("div",{staticClass:"language-diff extra-class"},[t("pre",{pre:!0,attrs:{class:"language-diff"}},[t("code",[e._v("commit 34cf15b3aac1d8c2693af1b9749b888f3f29e510\nAuthor: Alekos Filini \nDate: Fri Nov 12 12:06:35 2021 +0100\n\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Fix TapTree iter depth\n")])]),e._v("\ndiff --git a/src/descriptor/tr.rs b/src/descriptor/tr.rs\nindex 79d3c05..314c7f4 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/descriptor/tr.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/descriptor/tr.rs")]),e._v("\n@@ -65,7 +65,7 @@ impl TapTree {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" /// Iterate over all miniscripts\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" pub fn iter(&self) -> TapTreeIter {\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" TapTreeIter { stack: vec![self] }\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" TapTreeIter { stack: vec![(0, self)] }\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // Helper function to translate keys\n")])]),e._v("@@ -262,7 +262,7 @@ pub struct TapTreeIter<'a, Pk: MiniscriptKey>\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("where\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Pk: 'a,\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("{\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" stack: Vec<&'a TapTree>,\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" stack: Vec<(usize, &'a TapTree)>,\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("}\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("impl<'a, Pk> Iterator for TapTreeIter<'a, Pk>\n")])]),e._v("@@ -273,13 +273,13 @@ where\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" fn next(&mut self) -> Option {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" while !self.stack.is_empty() {\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' let last = self.stack.pop().expect("Size checked above");\n')])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' let (depth, last) = self.stack.pop().expect("Size checked above");\n')])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" match &*last {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" TapTree::Tree(l, r) => {\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" self.stack.push(&r);\n")]),t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" self.stack.push(&l);\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" self.stack.push((depth + 1, &r));\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" self.stack.push((depth + 1, &l));\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" TapTree::Leaf(ref ms) => return Some((self.stack.len(), ms)),\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" TapTree::Leaf(ref ms) => return Some((depth, ms)),\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" None\n")])])])])]),t("p",[t("code",[e._v("TapTreeIterator")]),e._v(" is an iterator that goes through a "),t("code",[e._v("TapTree")]),e._v(" and yields a "),t("code",[e._v("(depth, node)")]),e._v(" pair. This is then fed to "),t("a",{attrs:{href:"https://github.com/afilini/rust-miniscript/blob/taproot/src/descriptor/tr.rs#L183-L189",target:"_blank",rel:"noopener noreferrer"}},[t("code",[e._v("TaprootBuilder")]),t("OutboundLink")],1),e._v(", which returns an error if trying to insert nodes\nin "),t("a",{attrs:{href:"https://github.com/afilini/rust-bitcoin/blob/taproot-testing/src/util/taproot.rs#L403-L405",target:"_blank",rel:"noopener noreferrer"}},[e._v("an order that is not DFS"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("The way the depth was computed before made the builder always fail for non-trivial trees (i.e. more than 1 node).")]),e._v(" "),t("p",[e._v("Here I decided to play the safe card, and just keep track of the depth explicitly: I think there might be a way to compute the depth just knowing the "),t("code",[e._v("self.stack.len()")]),e._v(" (assuming the tree has a specific structure,\nwhich I'm not sure applies here), but anyway I didn't have much time to think about it and I just went for the \"dumb but idiot-proof\" way which ended up working fine.")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("$ git show f4a3459\n")])])]),t("div",{staticClass:"language-diff extra-class"},[t("pre",{pre:!0,attrs:{class:"language-diff"}},[t("code",[e._v("commit f4a3459128e37ca0c2701b8b6da064d4952296ff\nAuthor: Alekos Filini \nDate: Sat Nov 13 14:15:52 2021 +0100\n\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Switch rust-bitcoin rev\n")])]),e._v("\ndiff --git a/Cargo.toml b/Cargo.toml\nindex 12825e8..8240024 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/Cargo.toml")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/Cargo.toml")]),e._v('\n@@ -17,7 +17,7 @@ rand = ["bitcoin/rand"]\n\n'),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("[dependencies]\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v('# bitcoin = "0.27"\n')])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v('bitcoin = {git = "https://github.com/sanket1729/rust-bitcoin", branch = "taproot_psbt"}\n')])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v('bitcoin = { git = "https://github.com/afilini/rust-bitcoin.git", branch = "taproot-testing" }\n')])]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("[dependencies.serde]\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v('version = "1.0"\n')])])])])]),t("p",[e._v("Trivial commit, switch to "),t("a",{attrs:{href:"https://github.com/afilini/rust-bitcoin/tree/taproot-testing",target:"_blank",rel:"noopener noreferrer"}},[e._v("my fork of rust-bitcoin"),t("OutboundLink")],1),e._v(" so that I can make changes if necessary.")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("$ git show 0446b16\n")])])]),t("div",{staticClass:"language-diff extra-class"},[t("pre",{pre:!0,attrs:{class:"language-diff"}},[t("code",[e._v("commit 0446b1631cec9f7118d46f0f4c94ccd20de29f94\nAuthor: Alekos Filini \nDate: Sat Nov 13 14:25:18 2021 +0100\n\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Parse x-only keys\n")])]),e._v("\ndiff --git a/src/descriptor/key.rs b/src/descriptor/key.rs\nindex 4108d00..b7f90b5 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/descriptor/key.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/descriptor/key.rs")]),e._v("\n@@ -283,9 +283,9 @@ impl FromStr for DescriptorPublicKey {\n\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" fn from_str(s: &str) -> Result {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' // A "raw" public key without any origin is the least we accept.\n')])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" if s.len() < 66 {\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" if s.len() < 64 {\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" return Err(DescriptorKeyParseError(\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' "Key too short (<66 char), doesn\'t match any format",\n')])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' "Key too short (<64 char), doesn\'t match any format",\n')])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" ));\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")])]),e._v("\n@@ -301,6 +301,14 @@ impl FromStr for DescriptorPublicKey {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" derivation_path,\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" wildcard,\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }))\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" } else if key_part.len() == 64 {\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // x-only pubkey, prefix it with `02`\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' let key = bitcoin::PublicKey::from_str(&format!("02{}", key_part))\n')]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' .map_err(|_| DescriptorKeyParseError("Error while parsing x-only public key"))?;\n')]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Ok(DescriptorPublicKey::SinglePub(DescriptorSinglePub {\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" key,\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" origin,\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }))\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" } else {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" if key_part.len() >= 2\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' && !(&key_part[0..2] == "02" || &key_part[0..2] == "03" || &key_part[0..2] == "04")\n')])]),e._v("diff --git a/src/lib.rs b/src/lib.rs\nindex e168b16..3a2335e 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/lib.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/lib.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("@@ -95,8 +95,6 @@")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("#![deny(non_snake_case)]\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("#![deny(unused_mut)]\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("#![deny(dead_code)]\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("#![deny(unused_imports)]\n")]),t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("#![deny(missing_docs)]\n")])]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("pub extern crate bitcoin;\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v('#[cfg(feature = "serde")]\n')])])])])]),t("p",[e._v("This, I'm not really sure of: Taproot uses x-only public keys, which means that the first byte (which is usually a "),t("code",[e._v("03")]),e._v(" or a "),t("code",[e._v("02")]),e._v(") that indicates the parity of the EC point is completely dropped, and it's implicit\nthat the point is even (= "),t("code",[e._v("02")]),e._v("). Check out "),t("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0340.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[t("code",[e._v("BIP340")]),t("OutboundLink")],1),e._v(" for a much better explanation.")]),e._v(" "),t("p",[e._v("So here when I find a string that is only 64 characters long I will assume it's an x-only pubkey, and I will parse it as a normal "),t("code",[e._v("bitcoin::PublicKey")]),e._v(" by prefixing it with "),t("code",[e._v("02")]),e._v(".")]),e._v(" "),t("p",[e._v("I guess one alternative could have been to try and parse it as a "),t("code",[e._v("schnorr::PublicKey")]),e._v(' and then "convert" it to a '),t("code",[e._v("ecdsa::PublicKey")]),e._v(" which should be supported, but once again I just wanted to get it done quickly and\nthis worked fine.")]),e._v(" "),t("p",[e._v("I also disabled the "),t("code",[e._v("unused_imports")]),e._v(" and "),t("code",[e._v("missing_docs")]),e._v(" lint so that the compiler wouldn't whine too much.")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("$ git show 87316ff\n")])])]),t("div",{staticClass:"language-diff extra-class"},[t("pre",{pre:!0,attrs:{class:"language-diff"}},[t("code",[e._v("commit 87316fffd06ab3bdf300fd1a958ddaa2789a6696\nAuthor: Alekos Filini \nDate: Sat Nov 13 14:26:01 2021 +0100\n\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Parse `tr()` descriptors\n")])]),e._v("\ndiff --git a/src/descriptor/mod.rs b/src/descriptor/mod.rs\nindex 06d98e1..4190786 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/descriptor/mod.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/descriptor/mod.rs")]),e._v("\n@@ -610,6 +610,7 @@ where\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' ("wpkh", 1) => Descriptor::Wpkh(Wpkh::from_tree(top)?),\n')]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' ("sh", 1) => Descriptor::Sh(Sh::from_tree(top)?),\n')]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' ("wsh", 1) => Descriptor::Wsh(Wsh::from_tree(top)?),\n')])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' ("tr", _) => Descriptor::Tr(Tr::from_tree(top)?),\n')])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" _ => Descriptor::Bare(Bare::from_tree(top)?),\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" })\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")])]),e._v("diff --git a/src/expression.rs b/src/expression.rs\nindex 1cef614..11a68d3 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/expression.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/expression.rs")]),e._v("\n@@ -100,7 +100,12 @@ impl<'a> Tree<'a> {\n\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" sl = &sl[n + 1..];\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" loop {\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let (arg, new_sl) = Tree::from_slice_helper_round(sl, depth + 1)?;\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let (arg, new_sl) = if sl.contains('{') {\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Tree::from_slice_helper_curly(sl, depth + 1)?\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" } else {\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Tree::from_slice_helper_round(sl, depth + 1)?\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" };\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" ret.args.push(arg);\n")])]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" if new_sl.is_empty() {\n")])])])])]),t("p",[e._v("When trying to parse a descriptor (essentially turning a recursive string of "),t("code",[e._v("operator(args)")]),e._v(" into an abstract tree in memory) use a "),t("em",[e._v("curly-bracket-aware")]),e._v(" parser if there is one in the string.")]),e._v(" "),t("p",[e._v("The code to then build a "),t("code",[e._v("Tr")]),e._v(" struct given an "),t("code",[e._v("expression::Tree")]),e._v(" (and the "),t("code",[e._v("from_slice_helper_curly")]),e._v(" function) were already implemented, so it was just a matter of correctly\nbuilding the abstract tree by parsing curly brackets in descriptors.")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("$ git show 3055cab\n")])])]),t("div",{staticClass:"language-diff extra-class"},[t("pre",{pre:!0,attrs:{class:"language-diff"}},[t("code",[e._v("commit 3055cabef8bd51eda344ce501b03c533fd367b4f\nAuthor: Alekos Filini \nDate: Sat Nov 13 14:26:30 2021 +0100\n\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Fix control block creation when satisfying `Tr`\n")])]),e._v("\ndiff --git a/src/descriptor/tr.rs b/src/descriptor/tr.rs\nindex 314c7f4..8487d56 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/descriptor/tr.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/descriptor/tr.rs")]),e._v("\n@@ -571,17 +571,14 @@ impl DescriptorTrait for Tr {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" } else {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let ver = LeafVersion::default();\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let leaf_script = (ms.encode(), ver);\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let control_block_set = spend_info\n")]),t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" .as_script_map()\n")]),t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" .get(&leaf_script)\n")]),t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' .expect("Control block must exist in script map for every known leaf");\n')])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // let control_block_set = spend_info\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // .as_script_map()\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // .get(&leaf_script)\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' // .expect("Control block must exist in script map for every known leaf");\n')]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' let control_block = spend_info.control_block(&leaf_script).expect("Control block must exist in script map for every known leaf");\n')])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" wit.push(leaf_script.0.into_bytes()); // Push the leaf script\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // There can be multiple control blocks for a (script, ver) pair\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // Find the smallest one amongst those\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let control_block = control_block_set\n")]),t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" .iter()\n")]),t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" .min_by(|x, y| x.as_inner().len().cmp(&y.as_inner().len()))\n")]),t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' .expect("Atleast one control must exist for a known leaf");\n')])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" wit.push(control_block.serialize());\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // Finally, save the minimum\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" min_wit = Some(wit);\n")])]),e._v("\n")])])]),t("p",[e._v("This is where things get more interesting: this section of code builds the witness to satisfy a Taproot descriptor. In case of a script-spend, we need to prove that the script we are using had been committed\ninto the public key of our "),t("code",[e._v("P2TR")]),e._v(' input. We do this by adding a "control block", that contains data about the parity of the key, the leaf version used, and the merkle path from the leaf we are using to spend\nup to the merkle root, which is committed into the public key. Once again, this is explained very well in '),t("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0341.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[t("code",[e._v("BIP341")]),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("Before my patch the code was only getting the set of merkle paths that could lead from the root to the leaves that contain a given script. For context, the signature of "),t("code",[e._v("TaprootSpendInfo::as_script_map(&self)")]),e._v(" is:")]),e._v(" "),t("div",{staticClass:"language-rust extra-class"},[t("pre",{pre:!0,attrs:{class:"language-rust"}},[t("code",[t("span",{pre:!0,attrs:{class:"token comment"}},[e._v("/// Access the internal script map")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("pub")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("fn")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token function-definition function"}},[e._v("as_script_map")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("&")]),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("self")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("->")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("&")]),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("BTreeMap")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("Script")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("LeafVersion")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("BTreeSet")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("TaprootMerkleBranch")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">>")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("{")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("}")]),e._v("\n")])])]),t("p",[e._v('Then the code would look for the "shortest" path to that specific script, as it would save size in the final transaction (leaves that are more "deep" in the tree than others naturally have more hidden branches\nin their path to the root, and thus require a longer control block to reveal them all).')]),e._v(" "),t("p",[e._v("The issue here is that the "),t("code",[e._v("control_block")]),e._v(" variable is then serialized directly into the witness. But this is not a control block, it's just a set of merkle paths! A control block only has "),t("em",[e._v("one")]),e._v(" merkle path, and\nincludes the leaf version and the key parity bit.")]),e._v(" "),t("p",[e._v("Conveniently, the "),t("code",[e._v("TaprootSpendInfo")]),e._v(' struct also has this other method (I\'m including the implementation as well, because it shows that internally it does the same "trick" to find the shortest path):')]),e._v(" "),t("div",{staticClass:"language-rust extra-class"},[t("pre",{pre:!0,attrs:{class:"language-rust"}},[t("code",[t("span",{pre:!0,attrs:{class:"token comment"}},[e._v("/// Obtain a [`ControlBlock`] for particular script with the given version.")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token comment"}},[e._v("/// Returns [`None`] if the script is not contained in the [`TaprootSpendInfo`]")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token comment"}},[e._v("/// If there are multiple ControlBlocks possible, this returns the shortest one.")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("pub")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("fn")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token function-definition function"}},[e._v("control_block")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("&")]),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("self")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v(" script_ver"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(":")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("&")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("Script")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("LeafVersion")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("->")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("Option")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("ControlBlock")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("{")]),e._v("\n "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("let")]),e._v(" merkle_branch_set "),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("self")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("script_map"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[e._v("get")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("script_ver"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("?")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(";")]),e._v("\n "),t("span",{pre:!0,attrs:{class:"token comment"}},[e._v("// Choose the smallest one amongst the multiple script maps")]),e._v("\n "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("let")]),e._v(" smallest "),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v(" merkle_branch_set\n "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[e._v("iter")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[e._v("min_by")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token closure-params"}},[t("span",{pre:!0,attrs:{class:"token closure-punctuation punctuation"}},[e._v("|")]),e._v("x"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v(" y"),t("span",{pre:!0,attrs:{class:"token closure-punctuation punctuation"}},[e._v("|")])]),e._v(" x"),t("span",{pre:!0,attrs:{class:"token number"}},[e._v(".0")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[e._v("len")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[e._v("cmp")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("&")]),e._v("y"),t("span",{pre:!0,attrs:{class:"token number"}},[e._v(".0")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[e._v("len")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[e._v("expect")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token string"}},[e._v('"Non-empty iterator"')]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(";")]),e._v("\n "),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("Some")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("ControlBlock")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("{")]),e._v("\n internal_key"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(":")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("self")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("internal_key"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v("\n output_key_parity"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(":")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("self")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("output_key_parity"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v("\n leaf_version"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(":")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("LeafVersion")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("::")]),t("span",{pre:!0,attrs:{class:"token function"}},[e._v("default")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v("\n merkle_branch"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(":")]),e._v(" smallest"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[e._v("clone")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v("\n "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("}")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("}")]),e._v("\n")])])]),t("p",[e._v("So to fix this code we just have to use that method instead, and we can get it done in one single line!")]),e._v(" "),t("p",[e._v('Instead of removing the old code at the time I only commented it out, because I initially thought I would still have to look for the shortest script myself, and I figured the "sorting" code would come in handy\nlater on.')]),e._v(" "),t("p",[e._v("Also, if you are an acute observer, you might have noticed that there's a bug in this last snippet of code. Feel free to think about it a little bit, then check out the "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-bitcoin/pull/703",target:"_blank",rel:"noopener noreferrer"}},[e._v("PR"),t("OutboundLink")],1),e._v(" I made\nif you wanna know the answer!")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("git show 35378ad\n")])])]),t("div",{staticClass:"language-diff extra-class"},[t("pre",{pre:!0,attrs:{class:"language-diff"}},[t("code",[e._v("commit 35378ad01a6f2b8161a3f36448b24d031f8aeaec\nAuthor: Alekos Filini \nDate: Sat Nov 13 14:27:14 2021 +0100\n\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Consider key-spend max satisfaction weight\n")])]),e._v("\ndiff --git a/src/descriptor/tr.rs b/src/descriptor/tr.rs\nindex 8487d56..fabf860 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/descriptor/tr.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/descriptor/tr.rs")]),e._v("\n@@ -593,7 +593,7 @@ impl DescriptorTrait for Tr {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")])]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" fn max_satisfaction_weight(&self) -> Result {\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let mut max_wieght = None;\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let mut max_wieght = Some(65);\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" for (depth, ms) in self.iter_scripts() {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let script_size = ms.script_size();\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let max_sat_elems = match ms.max_satisfaction_witness_elements() {\n")])])])])]),t("p",[e._v("This is a little bug in the code that tries to compute what the maximum satisfaction weight would be for a descriptor. For instance, we use this in BDK to compute how many extra sats of fees we need to pay\nin order to target a given fee rate, assuming the descriptor is satisfied with the worst (larger and most expensive) path.")]),e._v(" "),t("p",[e._v("For Taproot descriptors, it's just a matter of iterating over the leaves in the tree and pick the most expensive one... or is it? This doesn't take into account that Taproot outputs can also be spent with\nkey-spend, which means just pushing a signature to the witness. This signature is 64 bytes long when using the new "),t("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0341.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[t("code",[e._v("SIGHASH_DEFAULT")]),t("OutboundLink")],1),e._v(" sighash, or 65 otherwise. Since we are thinking about the maximum satisfaction\nweight, or the worst case possible, we naturally pick the latter.")]),e._v(" "),t("p",[e._v("Note that theoretically you could build a Taproot address \"without\" an available key-path spend (by using an unspendable Schnorr public key), but the code here in rust-miniscript doesn't take that into\naccount, as there's no way that I'm aware of to specificy in a "),t("code",[e._v("tr()")]),e._v(" descriptor that the key is unspendable. So, while theoretically here we should first check whether the key-spend path is available before\naccounting for its weight, in practice this is always true in miniscript so we just use that as our starting worst case and update it later if necessary while iterating the tree leaves.")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("$ git show b4878f8\n")])])]),t("div",{staticClass:"language-diff extra-class"},[t("pre",{pre:!0,attrs:{class:"language-diff"}},[t("code",[e._v("commit b4878f816e9ede11d5ed947c06e03aa988e3e26f\nAuthor: Alekos Filini \nDate: Sat Nov 13 14:27:53 2021 +0100\n\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Look for taproot stuff in psbts\n")])]),e._v("\ndiff --git a/src/psbt/mod.rs b/src/psbt/mod.rs\nindex 9a8b17d..42c6ce8 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/psbt/mod.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/psbt/mod.rs")]),e._v("\n@@ -25,13 +25,14 @@ use bitcoin;\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use bitcoin::hashes::{hash160, ripemd160, sha256, sha256d};\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use bitcoin::secp256k1::{self, Secp256k1};\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use bitcoin::util::psbt::PartiallySignedTransaction as Psbt;\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use bitcoin::util::taproot::TapLeafHash;\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use bitcoin::Script;\n")])]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use interpreter;\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use miniscript::limits::SEQUENCE_LOCKTIME_DISABLE_FLAG;\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use miniscript::satisfy::{After, Older};\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use Satisfier;\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use {BitcoinECSig, Preimage32};\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use {BitcoinECSig, BitcoinSchnorrSig, Preimage32};\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use {MiniscriptKey, ToPublicKey};\n")])]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("mod finalizer;\n")])]),e._v("@@ -231,6 +232,24 @@ impl<'psbt> PsbtInputSatisfier<'psbt> {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("}\n")])]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("impl<'psbt, Pk: MiniscriptKey + ToPublicKey> Satisfier for PsbtInputSatisfier<'psbt> {\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" fn lookup_tap_key_spend_sig(&self) -> Option {\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" if let Some((sig, hash_ty)) = self.psbt.inputs[self.index].tap_key_sig {\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Some(BitcoinSchnorrSig { sig, hash_ty })\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" } else {\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" None\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" fn lookup_tap_leaf_script_sig(&self, pk: &Pk, lh: &TapLeafHash) -> Option {\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let pk = pk.to_x_only_pubkey();\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" if let Some((sig, hash_ty)) = self.psbt.inputs[self.index].tap_script_sigs.get(&(pk, *lh)) {\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Some(BitcoinSchnorrSig { sig: *sig, hash_ty: *hash_ty })\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" } else {\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" None\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" fn lookup_ec_sig(&self, pk: &Pk) -> Option {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" if let Some(rawsig) = self.psbt.inputs[self.index]\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" .partial_sigs\n")])])])])]),t("p",[e._v("This commit implements the Taproot-specific "),t("code",[e._v("Satisfier")]),e._v(" methods on "),t("code",[e._v("PsbtInputSatisfier")]),e._v(". The code to produce a valid witness (i.e. "),t("em",[e._v("satisfy")]),e._v(") a descriptor by looking for Taproot key-spend or script-spend signatures\nis already implemented, so it's just a matter of actually returning those, if they are present in a PSBT.")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("$ git show 80da0ba\n")])])]),t("div",{staticClass:"language-diff extra-class"},[t("pre",{pre:!0,attrs:{class:"language-diff"}},[t("code",[e._v("commit 80da0ba9b742b2dee23e7302e2f95a6e96b1d6ed\nAuthor: Alekos Filini \nDate: Sat Nov 13 16:54:27 2021 +0100\n\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Iter keys in `MultiA`\n")])]),e._v("\ndiff --git a/src/miniscript/iter.rs b/src/miniscript/iter.rs\nindex 36c4b69..a54a371 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/miniscript/iter.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/miniscript/iter.rs")]),e._v("\n@@ -121,7 +121,7 @@ impl Miniscript {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" pub fn get_leaf_pk(&self) -> Vec {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" match self.node {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Terminal::PkK(ref key) => vec![key.clone()],\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Terminal::Multi(_, ref keys) => keys.clone(),\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Terminal::Multi(_, ref keys) | Terminal::MultiA(_, ref keys) => keys.clone(),\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" _ => vec![],\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")])]),e._v("@@ -139,7 +139,7 @@ impl Miniscript {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" match self.node {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Terminal::PkH(ref hash) => vec![hash.clone()],\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Terminal::PkK(ref key) => vec![key.to_pubkeyhash()],\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Terminal::Multi(_, ref keys) => keys.iter().map(Pk::to_pubkeyhash).collect(),\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Terminal::Multi(_, ref keys) | Terminal::MultiA(_, ref keys) => keys.iter().map(Pk::to_pubkeyhash).collect(),\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" _ => vec![],\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")])]),e._v("@@ -155,7 +155,7 @@ impl Miniscript {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" match self.node {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Terminal::PkH(ref hash) => vec![PkPkh::HashedPubkey(hash.clone())],\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Terminal::PkK(ref key) => vec![PkPkh::PlainPubkey(key.clone())],\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Terminal::Multi(_, ref keys) => keys\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Terminal::Multi(_, ref keys) | Terminal::MultiA(_, ref keys) => keys\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" .into_iter()\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" .map(|key| PkPkh::PlainPubkey(key.clone()))\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" .collect(),\n")])]),e._v("@@ -170,7 +170,7 @@ impl Miniscript {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" pub fn get_nth_pk(&self, n: usize) -> Option {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" match (&self.node, n) {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" (&Terminal::PkK(ref key), 0) => Some(key.clone()),\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" (&Terminal::Multi(_, ref keys), _) => keys.get(n).cloned(),\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" (&Terminal::Multi(_, ref keys), _) | (&Terminal::MultiA(_, ref keys), _) => keys.get(n).cloned(),\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" _ => None,\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")])]),e._v("@@ -186,7 +186,7 @@ impl Miniscript {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" match (&self.node, n) {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" (&Terminal::PkH(ref hash), 0) => Some(hash.clone()),\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" (&Terminal::PkK(ref key), 0) => Some(key.to_pubkeyhash()),\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" (&Terminal::Multi(_, ref keys), _) => keys.get(n).map(Pk::to_pubkeyhash),\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" (&Terminal::Multi(_, ref keys), _) | (&Terminal::MultiA(_, ref keys), _) => keys.get(n).map(Pk::to_pubkeyhash),\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" _ => None,\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")])]),e._v("@@ -199,7 +199,7 @@ impl Miniscript {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" match (&self.node, n) {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" (&Terminal::PkH(ref hash), 0) => Some(PkPkh::HashedPubkey(hash.clone())),\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" (&Terminal::PkK(ref key), 0) => Some(PkPkh::PlainPubkey(key.clone())),\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" (&Terminal::Multi(_, ref keys), _) => {\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" (&Terminal::Multi(_, ref keys), _) | (&Terminal::MultiA(_, ref keys), _) => {\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" keys.get(n).map(|key| PkPkh::PlainPubkey(key.clone()))\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" _ => None,\n")])])])])]),t("p",[e._v("Taproot descriptors add a new miniscript operator called "),t("code",[e._v("multi_a()")]),e._v(" which behaves like "),t("code",[e._v("multi()")]),e._v(" in non-Taproot descriptors, but uses the new "),t("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0342.mediawiki#script-execution",target:"_blank",rel:"noopener noreferrer"}},[t("code",[e._v("OP_CHECKSIGADD")]),t("OutboundLink")],1),e._v(" opcode when serialized in a script.")]),e._v(" "),t("p",[e._v("When this was added, somebody forgot to update the various methods that iterate over the public keys of a descriptor to correctly return the keys contained in "),t("code",[e._v("multi_a()")]),e._v(" - essentially, it was falling back in\nthe default case used by the operators that don't contain any key, but this one does!")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("$ git show 8b108c5\n")])])]),t("div",{staticClass:"language-diff extra-class"},[t("pre",{pre:!0,attrs:{class:"language-diff"}},[t("code",[e._v("commit 8b108c5c0bf50b66b7220746525742b71f6cd4b4\nAuthor: Alekos Filini \nDate: Sat Nov 13 17:26:53 2021 +0100\n\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Fix witness generation for `MultiA`\n")])]),e._v("\ndiff --git a/src/miniscript/satisfy.rs b/src/miniscript/satisfy.rs\nindex 655436e..ab43707 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/miniscript/satisfy.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/miniscript/satisfy.rs")]),e._v("\n@@ -1264,7 +1264,7 @@ impl Satisfaction {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // Collect all available signatures\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let mut sig_count = 0;\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let mut sigs = vec![vec![vec![]]; keys.len()];\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" for (i, pk) in keys.iter().enumerate() {\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" for (i, pk) in keys.iter().rev().enumerate() {\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" match Witness::signature::<_, _, Ctx>(stfr, pk, leaf_hash) {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Witness::Stack(sig) => {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" sigs[i] = sig;\n")])])])])]),t("p",[e._v("And finally, the last little fix: the "),t("code",[e._v("multi_a()")]),e._v(" operator is satisfied by pushing to the witness either a signature (if you have one available for that specific public key) or an empty vector. The problem is,\nthey have to be in the right order to match the order of public keys in your Taproot script.")]),e._v(" "),t("p",[e._v("rust-miniscript was pushing them in reverse order, so script validation was always failing for multisigs that had more than 1 key. Adding a "),t("code",[e._v(".rev()")]),e._v(" to the iterator fixed the issue.")]),e._v(" "),t("h2",{attrs:{id:"conclusion"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#conclusion"}},[e._v("#")]),e._v(" Conclusion")]),e._v(" "),t("p",[e._v("And that was it! We now have a fully working "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-bitcoin",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust-bitcoin"),t("OutboundLink")],1),e._v(" and "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-miniscript",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust-miniscript"),t("OutboundLink")],1),e._v(" ready for Taproot.")]),e._v(" "),t("p",[e._v("In "),t("a",{attrs:{href:"/blog/2021/12/first-bdk-taproot-tx-look-at-the-code-part-2"}},[e._v("Part 2")]),e._v(" I will go over the code changes in BDK, but I think it's now time for you and I to take a break 😃")])])}),[],!1,null,null,null);t.default=a.exports}}]); \ No newline at end of file +(window.webpackJsonp=window.webpackJsonp||[]).push([[50],{398:function(e,t,s){"use strict";s.r(t);var n=s(7),a=Object(n.a)({},(function(){var e=this,t=e._self._c;return t("ContentSlotsDistributor",{attrs:{"slot-key":e.$parent.slotKey}},[t("p",[e._v("This is the first of a two-parts blog series in which I will try to explain all the changes that I made to BDK (and some of its dependencies) to make our "),t("a",{attrs:{href:"https://twitter.com/afilini/status/1459763243556163584",target:"_blank",rel:"noopener noreferrer"}},[e._v("first Taproot transaction in mainnet"),t("OutboundLink")],1),e._v(", which also\nturned out to be "),t("a",{attrs:{href:"https://twitter.com/afilini/status/1459774394054725634",target:"_blank",rel:"noopener noreferrer"}},[e._v("the first ever use of the new "),t("code",[e._v("OP_CHECKSIGADD")]),e._v(" opcode"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("Hopefully this will give an insight into what kind of changes need to be made to a wallet in order to support spending "),t("code",[e._v("P2TR")]),e._v(" outputs, both with key-spend and script-spend. BDK actually delegates\nmost of the hard work to "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-miniscript",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust-miniscript"),t("OutboundLink")],1),e._v(", and luckily most of the Taproot code was already implemented by the time I started working on it. I only had to patch a few little bugs here and there, and it ended up\nworking flawlessly in the end.")]),e._v(" "),t("p",[e._v("In this first part I will focus on the changes made to our dependencies, "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-bitcoin",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust-bitcoin"),t("OutboundLink")],1),e._v(" and "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-miniscript",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust-miniscript"),t("OutboundLink")],1),e._v(". In the second part I will talk about BDK itself.")]),e._v(" "),t("h2",{attrs:{id:"backstory"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#backstory"}},[e._v("#")]),e._v(" Backstory")]),e._v(" "),t("p",[e._v("On the evening of Thursday, November 11th I was attending our weekly "),t("a",{attrs:{href:"https://www.satoshispritz.com/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Satoshi Spritz"),t("OutboundLink")],1),e._v(" meetup in Milan. The activation of Taproot was right around the corner, and naturally that was the main discussion\ntopic that night. The activation was forecasted for the early afternoon of Sunday, November 14th, a little less than 72h later.")]),e._v(" "),t("p",[e._v("I began to wonder how hard it would be to patch BDK and add support for Taproot. I knew most of the work had already been done in our main dependencies, "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-bitcoin",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust-bitcoin"),t("OutboundLink")],1),e._v(" and "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-miniscript",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust-miniscript"),t("OutboundLink")],1),e._v(", and so I decided\nto challenge myself: could I make it in time for the activation?")]),e._v(" "),t("p",[e._v('The following day I started digging into the topic. It didn\'t help that up until that time I only had a rather "high level" idea of how Taproot worked, but luckily all the BIPs were very well written and\nstraightforward to understand.')]),e._v(" "),t("p",[e._v("By Friday night (or rather, early Saturday morning) "),t("a",{attrs:{href:"https://mempool.space/signet/tx/ba0ebb350717701ca4ea109aadfbaf3058f6cd73e5ece3927ddee653de06cf5a",target:"_blank",rel:"noopener noreferrer"}},[e._v("I had Taproot key-spend working"),t("OutboundLink")],1),e._v(", which made me pretty optimistic even though the activation date was actually moving closer, now being forecasted for\nSunday "),t("em",[e._v("morning")]),e._v(".")]),e._v(" "),t("p",[e._v("After a few hours of sleep I went back to work and by early Saturday afternoon "),t("a",{attrs:{href:"https://mempool.space/signet/tx/41d7d49f9f4edffa9ca88ad6fb887fbf1ae68f9f31def267fdb3a5949f766bf5",target:"_blank",rel:"noopener noreferrer"}},[e._v("I had Taproot script-spend working as well"),t("OutboundLink")],1),e._v(". This left me a few hours to coordinate with some friends and "),t("a",{attrs:{href:"https://mempool.space/address/1Taproote7gvQGKz5g982ecSbPvqJhMUf",target:"_blank",rel:"noopener noreferrer"}},[e._v("generate a vanity address"),t("OutboundLink")],1),e._v("\nto deposit funds into temporarily, as we didn't trust sending them to Taproot addresses before the activation (as they were anyone-can-spend according to the pre-activation rules).")]),e._v(" "),t("p",[e._v("After another pretty short night, I woke up a 5:30 AM on Sunday to monitor the activation. I broadcasted our transactions shortly after 6:00 AM as the activation block was being mined. Unfortunately, the first\nthree blocks that were enforcing Taproot rules "),t("a",{attrs:{href:"https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2021-November/019598.html",target:"_blank",rel:"noopener noreferrer"}},[e._v("didn't include any Taproot transaction"),t("OutboundLink")],1),e._v(", which indicates that the miners weren't actually running the new Bitcoin Core 22.0 nodes. The fourth block, mined by "),t("code",[e._v("Foundry USA")]),e._v(" "),t("a",{attrs:{href:"https://mempool.space/tx/2eb8dbaa346d4be4e82fe444c2f0be00654d8cfd8c4a9a61b11aeaab8c00b272",target:"_blank",rel:"noopener noreferrer"}},[e._v("included my transaction"),t("OutboundLink")],1),e._v(" and "),t("a",{attrs:{href:"https://twitter.com/achow101/status/1459760452775387136?s=20",target:"_blank",rel:"noopener noreferrer"}},[e._v("a few others"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("In the end our transaction was the third Taproot script-spend in the block, but the first to use the new "),t("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0342.mediawiki#script-execution",target:"_blank",rel:"noopener noreferrer"}},[t("code",[e._v("OP_CHECKSIGADD")]),t("OutboundLink")],1),e._v(" opcode, as the two preceding it were respectively "),t("a",{attrs:{href:"https://mempool.space/tx/37777defed8717c581b4c0509329550e344bdc14ac38f71fc050096887e535c8",target:"_blank",rel:"noopener noreferrer"}},[e._v("a single-sig"),t("OutboundLink")],1),e._v(" and "),t("a",{attrs:{href:"https://mempool.space/tx/905ecdf95a84804b192f4dc221cfed4d77959b81ed66013a7e41a6e61e7ed530",target:"_blank",rel:"noopener noreferrer"}},[e._v("a 2-of-2 multisig"),t("OutboundLink")],1),e._v("\nscript, made with with two "),t("code",[e._v("OP_CHECKSIG(VERIFY)")]),e._v("s.")]),e._v(" "),t("p",[e._v("Now, with the context out of the way, we can begin talking about the code!")]),e._v(" "),t("h2",{attrs:{id:"rust-bitcoin"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#rust-bitcoin"}},[e._v("#")]),e._v(" rust-bitcoin")]),e._v(" "),t("p",[e._v("The first dependency I had to update was "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-bitcoin",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust-bitcoin"),t("OutboundLink")],1),e._v(". Most of the taproot stuff were already merged in "),t("code",[e._v("master")]),e._v(" (altough they hadn't been released yet). One notable missing part was the support for "),t("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0371.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[t("code",[e._v("BIP371")]),t("OutboundLink")],1),e._v(",\nwhich is an extension of "),t("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0174.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[t("code",[e._v("BIP174")]),t("OutboundLink")],1),e._v(", aka the "),t("code",[e._v("Partially Signed Bitcoin Transaction")]),e._v(" BIP. This new BIP defines a few new fields that are required to properly handle Taproot transactions.")]),e._v(" "),t("p",[e._v("Luckily most of the work had already been done by "),t("a",{attrs:{href:"https://twitter.com/sanket1729",target:"_blank",rel:"noopener noreferrer"}},[e._v("sanket1729"),t("OutboundLink")],1),e._v(", so I forked his branch and made only few very minor changes, just to expose a structure that I will have to use later which in his code wasn't public.")]),e._v(" "),t("p",[e._v("You can find all the commits mentioned here in "),t("a",{attrs:{href:"https://github.com/afilini/rust-bitcoin/tree/taproot-testing",target:"_blank",rel:"noopener noreferrer"}},[e._v("my rust-bitcoin "),t("code",[e._v("taproot-testing")]),e._v(" branch"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("$ git diff 187234f f830df9\n")])])]),t("div",{staticClass:"language-diff extra-class"},[t("pre",{pre:!0,attrs:{class:"language-diff"}},[t("code",[e._v("diff --git a/src/lib.rs b/src/lib.rs\nindex 87d9c36..d5e5802 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/lib.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/lib.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("@@ -54,7 +54,6 @@")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("#![deny(unused_mut)]\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("#![deny(dead_code)]\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("#![deny(unused_imports)]\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("#![deny(missing_docs)]\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("#![deny(unused_must_use)]\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("#![deny(broken_intra_doc_links)]\n")])]),e._v("\ndiff --git a/src/util/taproot.rs b/src/util/taproot.rs\nindex 674eeee..3d56cbc 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/util/taproot.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/util/taproot.rs")]),e._v("\n@@ -440,7 +440,7 @@ impl TaprootBuilder {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("// Internally used structure to represent the node information in taproot tree\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v('#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]\n')])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("pub(crate) struct NodeInfo {\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("pub struct NodeInfo {\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" /// Merkle Hash for this node\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" pub(crate) hash: sha256::Hash,\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" /// information about leaves inside this node\n")])]),e._v("@@ -448,8 +448,12 @@ pub(crate) struct NodeInfo {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("}\n")])]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("impl NodeInfo {\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" pub fn hash(&self) -> &sha256::Hash {\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" &self.hash\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // Create a new NodeInfo with omitted/hidden info\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" fn new_hidden(hash: sha256::Hash) -> Self {\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" pub fn new_hidden(hash: sha256::Hash) -> Self {\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Self {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" hash: hash,\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" leaves: vec![],\n")])]),e._v("@@ -457,7 +461,7 @@ impl NodeInfo {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")])]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // Create a new leaf with NodeInfo\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" fn new_leaf_with_ver(script: Script, ver: LeafVersion) -> Self {\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" pub fn new_leaf_with_ver(script: Script, ver: LeafVersion) -> Self {\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let leaf = LeafInfo::new(script, ver);\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Self {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" hash: leaf.hash(),\n")])]),e._v("@@ -466,7 +470,7 @@ impl NodeInfo {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")])]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // Combine two NodeInfo's to create a new parent\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" fn combine(a: Self, b: Self) -> Result {\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" pub fn combine(a: Self, b: Self) -> Result {\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let mut all_leaves = Vec::with_capacity(a.leaves.len() + b.leaves.len());\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" for mut a_leaf in a.leaves {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" a_leaf.merkle_branch.push(b.hash)?; // add hashing partner\n")])]),e._v("\n")])])]),t("p",[e._v("There isn't much to explain here: I disabled the "),t("code",[e._v("missing_docs")]),e._v(" lint so that the compiler wouldn't complain about the new public methods that aren't documented.\nThen, I added a getter for the "),t("code",[e._v("hash")]),e._v(" field of "),t("code",[e._v("NodeInfo")]),e._v(" and made the struct itself and a bunch of methods public.")]),e._v(" "),t("p",[e._v('We will use this structure later to recover the merkle root of a Taproot script tree, given one leaf and the other "hidden" branches.')]),e._v(" "),t("h2",{attrs:{id:"rust-miniscript"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#rust-miniscript"}},[e._v("#")]),e._v(" rust-miniscript")]),e._v(" "),t("p",[e._v("Moving on to "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-miniscript",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust-miniscript"),t("OutboundLink")],1),e._v(': once again, most of the work required to support Taproot had already been done, but this time I was working with very "early" prototype-like code, so I was prepared to\nmake some changes to the code to get it to work how I wanted.')]),e._v(" "),t("p",[e._v("Instead of showing one big diff I will talk about the commits individually, which I think will help making more clear what I was doing.")]),e._v(" "),t("p",[e._v("Once again, you can find all the commits referenced here in "),t("a",{attrs:{href:"https://github.com/afilini/rust-miniscript/tree/taproot",target:"_blank",rel:"noopener noreferrer"}},[e._v("my rust-miniscript "),t("code",[e._v("taproot")]),e._v(" branch"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("$ git show 34cf15b\n")])])]),t("div",{staticClass:"language-diff extra-class"},[t("pre",{pre:!0,attrs:{class:"language-diff"}},[t("code",[e._v("commit 34cf15b3aac1d8c2693af1b9749b888f3f29e510\nAuthor: Alekos Filini \nDate: Fri Nov 12 12:06:35 2021 +0100\n\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Fix TapTree iter depth\n")])]),e._v("\ndiff --git a/src/descriptor/tr.rs b/src/descriptor/tr.rs\nindex 79d3c05..314c7f4 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/descriptor/tr.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/descriptor/tr.rs")]),e._v("\n@@ -65,7 +65,7 @@ impl TapTree {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" /// Iterate over all miniscripts\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" pub fn iter(&self) -> TapTreeIter {\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" TapTreeIter { stack: vec![self] }\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" TapTreeIter { stack: vec![(0, self)] }\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // Helper function to translate keys\n")])]),e._v("@@ -262,7 +262,7 @@ pub struct TapTreeIter<'a, Pk: MiniscriptKey>\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("where\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Pk: 'a,\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("{\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" stack: Vec<&'a TapTree>,\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" stack: Vec<(usize, &'a TapTree)>,\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("}\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("impl<'a, Pk> Iterator for TapTreeIter<'a, Pk>\n")])]),e._v("@@ -273,13 +273,13 @@ where\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" fn next(&mut self) -> Option {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" while !self.stack.is_empty() {\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' let last = self.stack.pop().expect("Size checked above");\n')])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' let (depth, last) = self.stack.pop().expect("Size checked above");\n')])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" match &*last {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" TapTree::Tree(l, r) => {\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" self.stack.push(&r);\n")]),t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" self.stack.push(&l);\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" self.stack.push((depth + 1, &r));\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" self.stack.push((depth + 1, &l));\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" TapTree::Leaf(ref ms) => return Some((self.stack.len(), ms)),\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" TapTree::Leaf(ref ms) => return Some((depth, ms)),\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" None\n")])])])])]),t("p",[t("code",[e._v("TapTreeIterator")]),e._v(" is an iterator that goes through a "),t("code",[e._v("TapTree")]),e._v(" and yields a "),t("code",[e._v("(depth, node)")]),e._v(" pair. This is then fed to "),t("a",{attrs:{href:"https://github.com/afilini/rust-miniscript/blob/taproot/src/descriptor/tr.rs#L183-L189",target:"_blank",rel:"noopener noreferrer"}},[t("code",[e._v("TaprootBuilder")]),t("OutboundLink")],1),e._v(", which returns an error if trying to insert nodes\nin "),t("a",{attrs:{href:"https://github.com/afilini/rust-bitcoin/blob/taproot-testing/src/util/taproot.rs#L403-L405",target:"_blank",rel:"noopener noreferrer"}},[e._v("an order that is not DFS"),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("The way the depth was computed before made the builder always fail for non-trivial trees (i.e. more than 1 node).")]),e._v(" "),t("p",[e._v("Here I decided to play the safe card, and just keep track of the depth explicitly: I think there might be a way to compute the depth just knowing the "),t("code",[e._v("self.stack.len()")]),e._v(" (assuming the tree has a specific structure,\nwhich I'm not sure applies here), but anyway I didn't have much time to think about it and I just went for the \"dumb but idiot-proof\" way which ended up working fine.")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("$ git show f4a3459\n")])])]),t("div",{staticClass:"language-diff extra-class"},[t("pre",{pre:!0,attrs:{class:"language-diff"}},[t("code",[e._v("commit f4a3459128e37ca0c2701b8b6da064d4952296ff\nAuthor: Alekos Filini \nDate: Sat Nov 13 14:15:52 2021 +0100\n\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Switch rust-bitcoin rev\n")])]),e._v("\ndiff --git a/Cargo.toml b/Cargo.toml\nindex 12825e8..8240024 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/Cargo.toml")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/Cargo.toml")]),e._v('\n@@ -17,7 +17,7 @@ rand = ["bitcoin/rand"]\n\n'),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("[dependencies]\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v('# bitcoin = "0.27"\n')])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v('bitcoin = {git = "https://github.com/sanket1729/rust-bitcoin", branch = "taproot_psbt"}\n')])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v('bitcoin = { git = "https://github.com/afilini/rust-bitcoin.git", branch = "taproot-testing" }\n')])]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("[dependencies.serde]\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v('version = "1.0"\n')])])])])]),t("p",[e._v("Trivial commit, switch to "),t("a",{attrs:{href:"https://github.com/afilini/rust-bitcoin/tree/taproot-testing",target:"_blank",rel:"noopener noreferrer"}},[e._v("my fork of rust-bitcoin"),t("OutboundLink")],1),e._v(" so that I can make changes if necessary.")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("$ git show 0446b16\n")])])]),t("div",{staticClass:"language-diff extra-class"},[t("pre",{pre:!0,attrs:{class:"language-diff"}},[t("code",[e._v("commit 0446b1631cec9f7118d46f0f4c94ccd20de29f94\nAuthor: Alekos Filini \nDate: Sat Nov 13 14:25:18 2021 +0100\n\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Parse x-only keys\n")])]),e._v("\ndiff --git a/src/descriptor/key.rs b/src/descriptor/key.rs\nindex 4108d00..b7f90b5 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/descriptor/key.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/descriptor/key.rs")]),e._v("\n@@ -283,9 +283,9 @@ impl FromStr for DescriptorPublicKey {\n\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" fn from_str(s: &str) -> Result {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' // A "raw" public key without any origin is the least we accept.\n')])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" if s.len() < 66 {\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" if s.len() < 64 {\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" return Err(DescriptorKeyParseError(\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' "Key too short (<66 char), doesn\'t match any format",\n')])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' "Key too short (<64 char), doesn\'t match any format",\n')])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" ));\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")])]),e._v("\n@@ -301,6 +301,14 @@ impl FromStr for DescriptorPublicKey {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" derivation_path,\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" wildcard,\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }))\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" } else if key_part.len() == 64 {\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // x-only pubkey, prefix it with `02`\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' let key = bitcoin::PublicKey::from_str(&format!("02{}", key_part))\n')]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' .map_err(|_| DescriptorKeyParseError("Error while parsing x-only public key"))?;\n')]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Ok(DescriptorPublicKey::SinglePub(DescriptorSinglePub {\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" key,\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" origin,\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }))\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" } else {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" if key_part.len() >= 2\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' && !(&key_part[0..2] == "02" || &key_part[0..2] == "03" || &key_part[0..2] == "04")\n')])]),e._v("diff --git a/src/lib.rs b/src/lib.rs\nindex e168b16..3a2335e 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/lib.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/lib.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("@@ -95,8 +95,6 @@")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("#![deny(non_snake_case)]\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("#![deny(unused_mut)]\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("#![deny(dead_code)]\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("#![deny(unused_imports)]\n")]),t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("#![deny(missing_docs)]\n")])]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("pub extern crate bitcoin;\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v('#[cfg(feature = "serde")]\n')])])])])]),t("p",[e._v("This, I'm not really sure of: Taproot uses x-only public keys, which means that the first byte (which is usually a "),t("code",[e._v("03")]),e._v(" or a "),t("code",[e._v("02")]),e._v(") that indicates the parity of the EC point is completely dropped, and it's implicit\nthat the point is even (= "),t("code",[e._v("02")]),e._v("). Check out "),t("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0340.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[t("code",[e._v("BIP340")]),t("OutboundLink")],1),e._v(" for a much better explanation.")]),e._v(" "),t("p",[e._v("So here when I find a string that is only 64 characters long I will assume it's an x-only pubkey, and I will parse it as a normal "),t("code",[e._v("bitcoin::PublicKey")]),e._v(" by prefixing it with "),t("code",[e._v("02")]),e._v(".")]),e._v(" "),t("p",[e._v("I guess one alternative could have been to try and parse it as a "),t("code",[e._v("schnorr::PublicKey")]),e._v(' and then "convert" it to a '),t("code",[e._v("ecdsa::PublicKey")]),e._v(" which should be supported, but once again I just wanted to get it done quickly and\nthis worked fine.")]),e._v(" "),t("p",[e._v("I also disabled the "),t("code",[e._v("unused_imports")]),e._v(" and "),t("code",[e._v("missing_docs")]),e._v(" lint so that the compiler wouldn't whine too much.")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("$ git show 87316ff\n")])])]),t("div",{staticClass:"language-diff extra-class"},[t("pre",{pre:!0,attrs:{class:"language-diff"}},[t("code",[e._v("commit 87316fffd06ab3bdf300fd1a958ddaa2789a6696\nAuthor: Alekos Filini \nDate: Sat Nov 13 14:26:01 2021 +0100\n\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Parse `tr()` descriptors\n")])]),e._v("\ndiff --git a/src/descriptor/mod.rs b/src/descriptor/mod.rs\nindex 06d98e1..4190786 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/descriptor/mod.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/descriptor/mod.rs")]),e._v("\n@@ -610,6 +610,7 @@ where\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' ("wpkh", 1) => Descriptor::Wpkh(Wpkh::from_tree(top)?),\n')]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' ("sh", 1) => Descriptor::Sh(Sh::from_tree(top)?),\n')]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' ("wsh", 1) => Descriptor::Wsh(Wsh::from_tree(top)?),\n')])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' ("tr", _) => Descriptor::Tr(Tr::from_tree(top)?),\n')])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" _ => Descriptor::Bare(Bare::from_tree(top)?),\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" })\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")])]),e._v("diff --git a/src/expression.rs b/src/expression.rs\nindex 1cef614..11a68d3 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/expression.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/expression.rs")]),e._v("\n@@ -100,7 +100,12 @@ impl<'a> Tree<'a> {\n\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" sl = &sl[n + 1..];\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" loop {\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let (arg, new_sl) = Tree::from_slice_helper_round(sl, depth + 1)?;\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let (arg, new_sl) = if sl.contains('{') {\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Tree::from_slice_helper_curly(sl, depth + 1)?\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" } else {\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Tree::from_slice_helper_round(sl, depth + 1)?\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" };\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" ret.args.push(arg);\n")])]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" if new_sl.is_empty() {\n")])])])])]),t("p",[e._v("When trying to parse a descriptor (essentially turning a recursive string of "),t("code",[e._v("operator(args)")]),e._v(" into an abstract tree in memory) use a "),t("em",[e._v("curly-bracket-aware")]),e._v(" parser if there is one in the string.")]),e._v(" "),t("p",[e._v("The code to then build a "),t("code",[e._v("Tr")]),e._v(" struct given an "),t("code",[e._v("expression::Tree")]),e._v(" (and the "),t("code",[e._v("from_slice_helper_curly")]),e._v(" function) were already implemented, so it was just a matter of correctly\nbuilding the abstract tree by parsing curly brackets in descriptors.")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("$ git show 3055cab\n")])])]),t("div",{staticClass:"language-diff extra-class"},[t("pre",{pre:!0,attrs:{class:"language-diff"}},[t("code",[e._v("commit 3055cabef8bd51eda344ce501b03c533fd367b4f\nAuthor: Alekos Filini \nDate: Sat Nov 13 14:26:30 2021 +0100\n\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Fix control block creation when satisfying `Tr`\n")])]),e._v("\ndiff --git a/src/descriptor/tr.rs b/src/descriptor/tr.rs\nindex 314c7f4..8487d56 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/descriptor/tr.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/descriptor/tr.rs")]),e._v("\n@@ -571,17 +571,14 @@ impl DescriptorTrait for Tr {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" } else {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let ver = LeafVersion::default();\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let leaf_script = (ms.encode(), ver);\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let control_block_set = spend_info\n")]),t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" .as_script_map()\n")]),t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" .get(&leaf_script)\n")]),t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' .expect("Control block must exist in script map for every known leaf");\n')])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // let control_block_set = spend_info\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // .as_script_map()\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // .get(&leaf_script)\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' // .expect("Control block must exist in script map for every known leaf");\n')]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' let control_block = spend_info.control_block(&leaf_script).expect("Control block must exist in script map for every known leaf");\n')])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" wit.push(leaf_script.0.into_bytes()); // Push the leaf script\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // There can be multiple control blocks for a (script, ver) pair\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // Find the smallest one amongst those\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let control_block = control_block_set\n")]),t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" .iter()\n")]),t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" .min_by(|x, y| x.as_inner().len().cmp(&y.as_inner().len()))\n")]),t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(' .expect("Atleast one control must exist for a known leaf");\n')])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" wit.push(control_block.serialize());\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // Finally, save the minimum\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" min_wit = Some(wit);\n")])]),e._v("\n")])])]),t("p",[e._v("This is where things get more interesting: this section of code builds the witness to satisfy a Taproot descriptor. In case of a script-spend, we need to prove that the script we are using had been committed\ninto the public key of our "),t("code",[e._v("P2TR")]),e._v(' input. We do this by adding a "control block", that contains data about the parity of the key, the leaf version used, and the merkle path from the leaf we are using to spend\nup to the merkle root, which is committed into the public key. Once again, this is explained very well in '),t("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0341.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[t("code",[e._v("BIP341")]),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("Before my patch the code was only getting the set of merkle paths that could lead from the root to the leaves that contain a given script. For context, the signature of "),t("code",[e._v("TaprootSpendInfo::as_script_map(&self)")]),e._v(" is:")]),e._v(" "),t("div",{staticClass:"language-rust extra-class"},[t("pre",{pre:!0,attrs:{class:"language-rust"}},[t("code",[t("span",{pre:!0,attrs:{class:"token comment"}},[e._v("/// Access the internal script map")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("pub")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("fn")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token function-definition function"}},[e._v("as_script_map")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("&")]),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("self")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("->")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("&")]),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("BTreeMap")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("Script")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("LeafVersion")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("BTreeSet")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("TaprootMerkleBranch")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">>")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("{")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("}")]),e._v("\n")])])]),t("p",[e._v('Then the code would look for the "shortest" path to that specific script, as it would save size in the final transaction (leaves that are more "deep" in the tree than others naturally have more hidden branches\nin their path to the root, and thus require a longer control block to reveal them all).')]),e._v(" "),t("p",[e._v("The issue here is that the "),t("code",[e._v("control_block")]),e._v(" variable is then serialized directly into the witness. But this is not a control block, it's just a set of merkle paths! A control block only has "),t("em",[e._v("one")]),e._v(" merkle path, and\nincludes the leaf version and the key parity bit.")]),e._v(" "),t("p",[e._v("Conveniently, the "),t("code",[e._v("TaprootSpendInfo")]),e._v(' struct also has this other method (I\'m including the implementation as well, because it shows that internally it does the same "trick" to find the shortest path):')]),e._v(" "),t("div",{staticClass:"language-rust extra-class"},[t("pre",{pre:!0,attrs:{class:"language-rust"}},[t("code",[t("span",{pre:!0,attrs:{class:"token comment"}},[e._v("/// Obtain a [`ControlBlock`] for particular script with the given version.")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token comment"}},[e._v("/// Returns [`None`] if the script is not contained in the [`TaprootSpendInfo`]")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token comment"}},[e._v("/// If there are multiple ControlBlocks possible, this returns the shortest one.")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("pub")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("fn")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token function-definition function"}},[e._v("control_block")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("&")]),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("self")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v(" script_ver"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(":")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("&")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("Script")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("LeafVersion")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("->")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("Option")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("ControlBlock")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("{")]),e._v("\n "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("let")]),e._v(" merkle_branch_set "),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("self")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("script_map"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[e._v("get")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("script_ver"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("?")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(";")]),e._v("\n "),t("span",{pre:!0,attrs:{class:"token comment"}},[e._v("// Choose the smallest one amongst the multiple script maps")]),e._v("\n "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("let")]),e._v(" smallest "),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v(" merkle_branch_set\n "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[e._v("iter")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[e._v("min_by")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token closure-params"}},[t("span",{pre:!0,attrs:{class:"token closure-punctuation punctuation"}},[e._v("|")]),e._v("x"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v(" y"),t("span",{pre:!0,attrs:{class:"token closure-punctuation punctuation"}},[e._v("|")])]),e._v(" x"),t("span",{pre:!0,attrs:{class:"token number"}},[e._v(".0")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[e._v("len")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[e._v("cmp")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("&")]),e._v("y"),t("span",{pre:!0,attrs:{class:"token number"}},[e._v(".0")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[e._v("len")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[e._v("expect")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token string"}},[e._v('"Non-empty iterator"')]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(";")]),e._v("\n "),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("Some")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("ControlBlock")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("{")]),e._v("\n internal_key"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(":")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("self")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("internal_key"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v("\n output_key_parity"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(":")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("self")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("output_key_parity"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v("\n leaf_version"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(":")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token class-name"}},[e._v("LeafVersion")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("::")]),t("span",{pre:!0,attrs:{class:"token function"}},[e._v("default")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v("\n merkle_branch"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(":")]),e._v(" smallest"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[e._v("clone")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v("\n "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("}")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("}")]),e._v("\n")])])]),t("p",[e._v("So to fix this code we just have to use that method instead, and we can get it done in one single line!")]),e._v(" "),t("p",[e._v('Instead of removing the old code at the time I only commented it out, because I initially thought I would still have to look for the shortest script myself, and I figured the "sorting" code would come in handy\nlater on.')]),e._v(" "),t("p",[e._v("Also, if you are an acute observer, you might have noticed that there's a bug in this last snippet of code. Feel free to think about it a little bit, then check out the "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-bitcoin/pull/703",target:"_blank",rel:"noopener noreferrer"}},[e._v("PR"),t("OutboundLink")],1),e._v(" I made\nif you wanna know the answer!")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("git show 35378ad\n")])])]),t("div",{staticClass:"language-diff extra-class"},[t("pre",{pre:!0,attrs:{class:"language-diff"}},[t("code",[e._v("commit 35378ad01a6f2b8161a3f36448b24d031f8aeaec\nAuthor: Alekos Filini \nDate: Sat Nov 13 14:27:14 2021 +0100\n\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Consider key-spend max satisfaction weight\n")])]),e._v("\ndiff --git a/src/descriptor/tr.rs b/src/descriptor/tr.rs\nindex 8487d56..fabf860 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/descriptor/tr.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/descriptor/tr.rs")]),e._v("\n@@ -593,7 +593,7 @@ impl DescriptorTrait for Tr {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")])]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" fn max_satisfaction_weight(&self) -> Result {\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let mut max_wieght = None;\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let mut max_wieght = Some(65);\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" for (depth, ms) in self.iter_scripts() {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let script_size = ms.script_size();\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let max_sat_elems = match ms.max_satisfaction_witness_elements() {\n")])])])])]),t("p",[e._v("This is a little bug in the code that tries to compute what the maximum satisfaction weight would be for a descriptor. For instance, we use this in BDK to compute how many extra sats of fees we need to pay\nin order to target a given fee rate, assuming the descriptor is satisfied with the worst (larger and most expensive) path.")]),e._v(" "),t("p",[e._v("For Taproot descriptors, it's just a matter of iterating over the leaves in the tree and pick the most expensive one... or is it? This doesn't take into account that Taproot outputs can also be spent with\nkey-spend, which means just pushing a signature to the witness. This signature is 64 bytes long when using the new "),t("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0341.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[t("code",[e._v("SIGHASH_DEFAULT")]),t("OutboundLink")],1),e._v(" sighash, or 65 otherwise. Since we are thinking about the maximum satisfaction\nweight, or the worst case possible, we naturally pick the latter.")]),e._v(" "),t("p",[e._v("Note that theoretically you could build a Taproot address \"without\" an available key-path spend (by using an unspendable Schnorr public key), but the code here in rust-miniscript doesn't take that into\naccount, as there's no way that I'm aware of to specificy in a "),t("code",[e._v("tr()")]),e._v(" descriptor that the key is unspendable. So, while theoretically here we should first check whether the key-spend path is available before\naccounting for its weight, in practice this is always true in miniscript so we just use that as our starting worst case and update it later if necessary while iterating the tree leaves.")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("$ git show b4878f8\n")])])]),t("div",{staticClass:"language-diff extra-class"},[t("pre",{pre:!0,attrs:{class:"language-diff"}},[t("code",[e._v("commit b4878f816e9ede11d5ed947c06e03aa988e3e26f\nAuthor: Alekos Filini \nDate: Sat Nov 13 14:27:53 2021 +0100\n\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Look for taproot stuff in psbts\n")])]),e._v("\ndiff --git a/src/psbt/mod.rs b/src/psbt/mod.rs\nindex 9a8b17d..42c6ce8 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/psbt/mod.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/psbt/mod.rs")]),e._v("\n@@ -25,13 +25,14 @@ use bitcoin;\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use bitcoin::hashes::{hash160, ripemd160, sha256, sha256d};\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use bitcoin::secp256k1::{self, Secp256k1};\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use bitcoin::util::psbt::PartiallySignedTransaction as Psbt;\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use bitcoin::util::taproot::TapLeafHash;\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use bitcoin::Script;\n")])]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use interpreter;\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use miniscript::limits::SEQUENCE_LOCKTIME_DISABLE_FLAG;\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use miniscript::satisfy::{After, Older};\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use Satisfier;\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use {BitcoinECSig, Preimage32};\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use {BitcoinECSig, BitcoinSchnorrSig, Preimage32};\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("use {MiniscriptKey, ToPublicKey};\n")])]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("mod finalizer;\n")])]),e._v("@@ -231,6 +232,24 @@ impl<'psbt> PsbtInputSatisfier<'psbt> {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("}\n")])]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("impl<'psbt, Pk: MiniscriptKey + ToPublicKey> Satisfier for PsbtInputSatisfier<'psbt> {\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" fn lookup_tap_key_spend_sig(&self) -> Option {\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" if let Some((sig, hash_ty)) = self.psbt.inputs[self.index].tap_key_sig {\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Some(BitcoinSchnorrSig { sig, hash_ty })\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" } else {\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" None\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" fn lookup_tap_leaf_script_sig(&self, pk: &Pk, lh: &TapLeafHash) -> Option {\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let pk = pk.to_x_only_pubkey();\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" if let Some((sig, hash_ty)) = self.psbt.inputs[self.index].tap_script_sigs.get(&(pk, *lh)) {\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Some(BitcoinSchnorrSig { sig: *sig, hash_ty: *hash_ty })\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" } else {\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" None\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v("\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" fn lookup_ec_sig(&self, pk: &Pk) -> Option {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" if let Some(rawsig) = self.psbt.inputs[self.index]\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" .partial_sigs\n")])])])])]),t("p",[e._v("This commit implements the Taproot-specific "),t("code",[e._v("Satisfier")]),e._v(" methods on "),t("code",[e._v("PsbtInputSatisfier")]),e._v(". The code to produce a valid witness (i.e. "),t("em",[e._v("satisfy")]),e._v(") a descriptor by looking for Taproot key-spend or script-spend signatures\nis already implemented, so it's just a matter of actually returning those, if they are present in a PSBT.")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("$ git show 80da0ba\n")])])]),t("div",{staticClass:"language-diff extra-class"},[t("pre",{pre:!0,attrs:{class:"language-diff"}},[t("code",[e._v("commit 80da0ba9b742b2dee23e7302e2f95a6e96b1d6ed\nAuthor: Alekos Filini \nDate: Sat Nov 13 16:54:27 2021 +0100\n\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Iter keys in `MultiA`\n")])]),e._v("\ndiff --git a/src/miniscript/iter.rs b/src/miniscript/iter.rs\nindex 36c4b69..a54a371 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/miniscript/iter.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/miniscript/iter.rs")]),e._v("\n@@ -121,7 +121,7 @@ impl Miniscript {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" pub fn get_leaf_pk(&self) -> Vec {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" match self.node {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Terminal::PkK(ref key) => vec![key.clone()],\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Terminal::Multi(_, ref keys) => keys.clone(),\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Terminal::Multi(_, ref keys) | Terminal::MultiA(_, ref keys) => keys.clone(),\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" _ => vec![],\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")])]),e._v("@@ -139,7 +139,7 @@ impl Miniscript {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" match self.node {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Terminal::PkH(ref hash) => vec![hash.clone()],\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Terminal::PkK(ref key) => vec![key.to_pubkeyhash()],\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Terminal::Multi(_, ref keys) => keys.iter().map(Pk::to_pubkeyhash).collect(),\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Terminal::Multi(_, ref keys) | Terminal::MultiA(_, ref keys) => keys.iter().map(Pk::to_pubkeyhash).collect(),\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" _ => vec![],\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")])]),e._v("@@ -155,7 +155,7 @@ impl Miniscript {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" match self.node {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Terminal::PkH(ref hash) => vec![PkPkh::HashedPubkey(hash.clone())],\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Terminal::PkK(ref key) => vec![PkPkh::PlainPubkey(key.clone())],\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Terminal::Multi(_, ref keys) => keys\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Terminal::Multi(_, ref keys) | Terminal::MultiA(_, ref keys) => keys\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" .into_iter()\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" .map(|key| PkPkh::PlainPubkey(key.clone()))\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" .collect(),\n")])]),e._v("@@ -170,7 +170,7 @@ impl Miniscript {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" pub fn get_nth_pk(&self, n: usize) -> Option {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" match (&self.node, n) {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" (&Terminal::PkK(ref key), 0) => Some(key.clone()),\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" (&Terminal::Multi(_, ref keys), _) => keys.get(n).cloned(),\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" (&Terminal::Multi(_, ref keys), _) | (&Terminal::MultiA(_, ref keys), _) => keys.get(n).cloned(),\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" _ => None,\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")])]),e._v("@@ -186,7 +186,7 @@ impl Miniscript {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" match (&self.node, n) {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" (&Terminal::PkH(ref hash), 0) => Some(hash.clone()),\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" (&Terminal::PkK(ref key), 0) => Some(key.to_pubkeyhash()),\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" (&Terminal::Multi(_, ref keys), _) => keys.get(n).map(Pk::to_pubkeyhash),\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" (&Terminal::Multi(_, ref keys), _) | (&Terminal::MultiA(_, ref keys), _) => keys.get(n).map(Pk::to_pubkeyhash),\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" _ => None,\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")])]),e._v("@@ -199,7 +199,7 @@ impl Miniscript {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" match (&self.node, n) {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" (&Terminal::PkH(ref hash), 0) => Some(PkPkh::HashedPubkey(hash.clone())),\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" (&Terminal::PkK(ref key), 0) => Some(PkPkh::PlainPubkey(key.clone())),\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" (&Terminal::Multi(_, ref keys), _) => {\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" (&Terminal::Multi(_, ref keys), _) | (&Terminal::MultiA(_, ref keys), _) => {\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" keys.get(n).map(|key| PkPkh::PlainPubkey(key.clone()))\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" }\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" _ => None,\n")])])])])]),t("p",[e._v("Taproot descriptors add a new miniscript operator called "),t("code",[e._v("multi_a()")]),e._v(" which behaves like "),t("code",[e._v("multi()")]),e._v(" in non-Taproot descriptors, but uses the new "),t("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0342.mediawiki#script-execution",target:"_blank",rel:"noopener noreferrer"}},[t("code",[e._v("OP_CHECKSIGADD")]),t("OutboundLink")],1),e._v(" opcode when serialized in a script.")]),e._v(" "),t("p",[e._v("When this was added, somebody forgot to update the various methods that iterate over the public keys of a descriptor to correctly return the keys contained in "),t("code",[e._v("multi_a()")]),e._v(" - essentially, it was falling back in\nthe default case used by the operators that don't contain any key, but this one does!")]),e._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("$ git show 8b108c5\n")])])]),t("div",{staticClass:"language-diff extra-class"},[t("pre",{pre:!0,attrs:{class:"language-diff"}},[t("code",[e._v("commit 8b108c5c0bf50b66b7220746525742b71f6cd4b4\nAuthor: Alekos Filini \nDate: Sat Nov 13 17:26:53 2021 +0100\n\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Fix witness generation for `MultiA`\n")])]),e._v("\ndiff --git a/src/miniscript/satisfy.rs b/src/miniscript/satisfy.rs\nindex 655436e..ab43707 100644\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("--- a/src/miniscript/satisfy.rs")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token coord"}},[e._v("+++ b/src/miniscript/satisfy.rs")]),e._v("\n@@ -1264,7 +1264,7 @@ impl Satisfaction {\n"),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" // Collect all available signatures\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let mut sig_count = 0;\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" let mut sigs = vec![vec![vec![]]; keys.len()];\n")])]),t("span",{pre:!0,attrs:{class:"token deleted-sign deleted"}},[t("span",{pre:!0,attrs:{class:"token prefix deleted"}},[e._v("-")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" for (i, pk) in keys.iter().enumerate() {\n")])]),t("span",{pre:!0,attrs:{class:"token inserted-sign inserted"}},[t("span",{pre:!0,attrs:{class:"token prefix inserted"}},[e._v("+")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" for (i, pk) in keys.iter().rev().enumerate() {\n")])]),t("span",{pre:!0,attrs:{class:"token unchanged"}},[t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" match Witness::signature::<_, _, Ctx>(stfr, pk, leaf_hash) {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" Witness::Stack(sig) => {\n")]),t("span",{pre:!0,attrs:{class:"token prefix unchanged"}},[e._v(" ")]),t("span",{pre:!0,attrs:{class:"token line"}},[e._v(" sigs[i] = sig;\n")])])])])]),t("p",[e._v("And finally, the last little fix: the "),t("code",[e._v("multi_a()")]),e._v(" operator is satisfied by pushing to the witness either a signature (if you have one available for that specific public key) or an empty vector. The problem is,\nthey have to be in the right order to match the order of public keys in your Taproot script.")]),e._v(" "),t("p",[e._v("rust-miniscript was pushing them in reverse order, so script validation was always failing for multisigs that had more than 1 key. Adding a "),t("code",[e._v(".rev()")]),e._v(" to the iterator fixed the issue.")]),e._v(" "),t("h2",{attrs:{id:"conclusion"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#conclusion"}},[e._v("#")]),e._v(" Conclusion")]),e._v(" "),t("p",[e._v("And that was it! We now have a fully working "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-bitcoin",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust-bitcoin"),t("OutboundLink")],1),e._v(" and "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-miniscript",target:"_blank",rel:"noopener noreferrer"}},[e._v("rust-miniscript"),t("OutboundLink")],1),e._v(" ready for Taproot.")]),e._v(" "),t("p",[e._v("In "),t("a",{attrs:{href:"/blog/2021/12/first-bdk-taproot-tx-look-at-the-code-part-2"}},[e._v("Part 2")]),e._v(" I will go over the code changes in BDK, but I think it's now time for you and I to take a break 😃")])])}),[],!1,null,null,null);t.default=a.exports}}]); \ No newline at end of file diff --git a/assets/js/51.d7433b37.js b/assets/js/51.072a36a2.js similarity index 99% rename from assets/js/51.d7433b37.js rename to assets/js/51.072a36a2.js index 1a6e88a13e..91a13b00a8 100644 --- a/assets/js/51.d7433b37.js +++ b/assets/js/51.072a36a2.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[51],{402:function(t,s,e){"use strict";e.r(s);var a=e(7),n=Object(a.a)({},(function(){var t=this,s=t._self._c;return s("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[s("p",[t._v("This is the second part of a two-part blog series in which I talk through the changes made to BDK to make a Taproot transaction. 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Keys, descriptors, Electrum endpoints are not stored in the database. This explains why you'll have to specify them every time in the command line. It can be seen more like a cache and can be safely deleted without risking funds.
  • BDK doesn't automatically "monitor" the blockchain, instead there's a sync command that has to be called by the user.
  • When you create a transaction and then sign it, it's not automatically broadcast to the network. There's a broadcast command that does this. Moreover, the command doesn't accept a normal Bitcoin raw transaction, but instead a PSBT. That's because internally transactions are always moved as PSBTs, and again, the broadcast command is just a very thin wrapper over the raw library call.

    • There are probably more of these examples, but hopefully by this point you'll have more or less understood the gist of it. If you are not a developer, some parts of this will feel weird, inefficient, hard -to understand, and that's absolutely normal. Just try to survive through the pain and you'll be rewarded!

    +to understand, and that's absolutely normal. Just try to survive through the pain and you'll be rewarded!

    ←

    Copyright © 2024 BDK Developers

    - + diff --git a/bdk-cli/index.html b/bdk-cli/index.html index 5ea704b219..16cba5f410 100644 --- a/bdk-cli/index.html +++ b/bdk-cli/index.html @@ -33,7 +33,7 @@ - + @@ -59,7 +59,7 @@ GitHub (opens new window)

    # BDK-CLI

    The bdk-cli (opens new window) repo has an example interactive shell built using the bdk library called bdk-cli that acts both as a reference implementation of a wallet -and a tool to quickly experiment with descriptors and transactions.

    - + diff --git a/bdk-cli/installation/index.html b/bdk-cli/installation/index.html index 5cd4248c0e..7c599bc236 100644 --- a/bdk-cli/installation/index.html +++ b/bdk-cli/installation/index.html @@ -35,7 +35,7 @@ - + @@ -110,7 +110,7 @@ wallet Wallet Operations

    An example command to sync a testnet wallet to a default electrum server looks like this:

    bdk-cli wallet -w example --descriptor "wpkh(tprv8ZgxMBicQKsPexGYyaFwnAsCXCjmz2FaTm6LtesyyihjbQE3gRMfXqQBXKM43DvC1UgRVv1qom1qFxNMSqVAs88qx9PhgFnfGVUdiiDf6j4/0/*)" sync
-

    +

    ←

    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/bdk-cli/interface/index.html b/bdk-cli/interface/index.html index ba35ae27c0..49b3e26e2d 100644 --- a/bdk-cli/interface/index.html +++ b/bdk-cli/interface/index.html @@ -29,7 +29,7 @@ - + @@ -364,7 +364,7 @@ --psbt <BASE64_PSBT> Sets the PSBT to sign --assume_height <HEIGHT> Assume the blockchain has reached a specific height. This affects the transaction finalization, if there are timelocks in the descriptor --trust_witness_utxo <WITNESS> Whether the signer should trust the witness_utxo, if the non_witness_utxo hasn’t been provided -

    Adds to the PSBT all the signatures it can produce with the secrets embedded in the descriptor (xprv or WIF keys). Returns the signed PSBT and, if there are enough item to satisfy the script, also the extracted raw Bitcoin transaction.

    Optionally, the --assume_height option can be specified to let the wallet assume the blockchain has reached a specific height. This affects the finalization of the PSBT which is done right at the end of the signing process: the wallet tries to satisfy the spending condition of each input using the partial signatures collected. In case timelocks are present the wallet needs to know whether or not they have expired. This flag is particularly useful for offline wallets.

    # sync

    This subcommand has no extra flags. It connects to the chosen Electrum server and synchronizes the list of transactions received and available UTXOs.

    +

    Adds to the PSBT all the signatures it can produce with the secrets embedded in the descriptor (xprv or WIF keys). Returns the signed PSBT and, if there are enough item to satisfy the script, also the extracted raw Bitcoin transaction.

    Optionally, the --assume_height option can be specified to let the wallet assume the blockchain has reached a specific height. This affects the finalization of the PSBT which is done right at the end of the signing process: the wallet tries to satisfy the spending condition of each input using the partial signatures collected. In case timelocks are present the wallet needs to know whether or not they have expired. This flag is particularly useful for offline wallets.

    # sync

    This subcommand has no extra flags. It connects to the chosen Electrum server and synchronizes the list of transactions received and available UTXOs.

    ←

    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/bdk-cli/introduction/index.html b/bdk-cli/introduction/index.html index 6d3a4e0051..358ec1a921 100644 --- a/bdk-cli/introduction/index.html +++ b/bdk-cli/introduction/index.html @@ -29,7 +29,7 @@ - + @@ -53,7 +53,7 @@ Blog GitHub - (opens new window)

    # Introduction

    bdk-cli (opens new window) is a lightweight repl (opens new window) wrapper over bdk that comes as a command line application. It is useful for quick testing and prototyping of bdk functionalities.

    This can also be used as an example application to create your own command line bitcoin wallet tool using bdk.

    bdk-cli can interface with all the blockchain backends currently supported by bdk, like rpc, electrum, esplora and compact_filters.

    Check out project documentation (opens new window) for more details.

    The following sections goes into more details on the installation and usage of bdk-cli.

    + (opens new window)

    # Introduction

    bdk-cli (opens new window) is a lightweight repl (opens new window) wrapper over bdk that comes as a command line application. It is useful for quick testing and prototyping of bdk functionalities.

    This can also be used as an example application to create your own command line bitcoin wallet tool using bdk.

    bdk-cli can interface with all the blockchain backends currently supported by bdk, like rpc, electrum, esplora and compact_filters.

    Check out project documentation (opens new window) for more details.

    The following sections goes into more details on the installation and usage of bdk-cli.

    ←

    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/bdk-cli/playground/index.html b/bdk-cli/playground/index.html index 0fc542f74b..03f5aed19c 100644 --- a/bdk-cli/playground/index.html +++ b/bdk-cli/playground/index.html @@ -27,7 +27,7 @@ - + @@ -51,7 +51,7 @@ Blog GitHub - (opens new window)

    # Playground

    + (opens new window)

    # Playground

    ←

    Copyright © 2024 BDK Developers

    - + diff --git a/bdk-cli/regtest/index.html b/bdk-cli/regtest/index.html index 12e5a22d25..b28c9d85a7 100644 --- a/bdk-cli/regtest/index.html +++ b/bdk-cli/regtest/index.html @@ -31,7 +31,7 @@ - + @@ -60,7 +60,7 @@

    Just like before, this command will probably take a while to finish.

    Once it's done, assuming you have a regtest bitcoind running in background, you can launch a new terminal and run the following command to actually start electrs:

    electrs --log-filters INFO --timestamp --db-dir /tmp/electrs-db --electrum-rpc-addr="127.0.0.1:50001" --network=regtest --cookie-file=$HOME/.bitcoin/regtest/.cookie

    on macOS you should change the cookie-file to $HOME/Library/Application Support/Bitcoin/regtest/.cookie.

    This will start the Electrum server on port 50001. You can then add the -n regtest -s 127.0.0.1:50001 to the bdk-cli commands to switch to the local regtest.

    # Troubleshooting

    # Stuck with "wait until bitcoind is synced (i.e. initialblockdownload = false)"

    Just generate a few blocks with bitcoin-cli generatetoaddress 1 <address>

    # Bonus: Docker

    If you have already installed Docker on your machine, you can also use 🍣 Nigiri CLI (opens new window) to spin-up a complete development environment in regtest that includes a bitcoin node, an electrs explorer and the esplora (opens new window) web-app to visualize blocks and transactions in the browser.

    Install 🍣 Nigiri

    $ curl https://getnigiri.vulpem.com | bash

    Start Docker daemon and run Nigiri box

    $ nigiri start
-

    This will start electrum RPC interface on port 51401, the REST interface on 3000 and the esplora UI on 5000 (You can visit with the browser and look for blocks, addresses and transactions)

    You can then add the -n regtest -s 127.0.0.1:51401 to the bdk-cli commands to switch to the local regtest.

    +

    This will start electrum RPC interface on port 51401, the REST interface on 3000 and the esplora UI on 5000 (You can visit with the browser and look for blocks, addresses and transactions)

    You can then add the -n regtest -s 127.0.0.1:51401 to the bdk-cli commands to switch to the local regtest.

    ←

    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/2020/12/hello-world/index.html b/blog/2020/12/hello-world/index.html index e1ef210552..2a5b0791e2 100644 --- a/blog/2020/12/hello-world/index.html +++ b/blog/2020/12/hello-world/index.html @@ -30,7 +30,7 @@ - + @@ -147,7 +147,7 @@ txid = txid );

    # Custom Database and Blockchain types

    We briefly mentioned before that for our example we used the MemoryDatabase, but that it could also be swapped for a different one: this is one example of the modularity of BDK. By default, some database types are already implemented in the library, namely the MemoryDatabase (opens new window) which only keeps data in RAM, the Sled (opens new window) database that can store data on a filesystem, and the SqliteDatabase (opens new window) that can store data into a SQLite database. But since the Database trait is public, users of the library can also implement different database types more suitable for their use-case.

    The same is true for the Blockchain types: the library provides (through the use of opt-in features) implementations for the Electrum, Esplora, CompactFilters (Neutrino) and Bitcoin Core rpc backends. Those again can also be -swapped with custom types if the user desires to do so.

    # Conclusion

    Hopefully, this article will help you get started with BDK! This is just a very quick and gentle introduction to the library, and only barely scratches the surface of what's inside: we will keep publishing more articles in the future to explain some of the more advanced features of BDK, like key generation, using complex descriptors with multiple keys and/or timelocks, using external signers, etc.

    If you'd like to learn more about the library feel free to ask any questions in the comment section down below, or join our Discord Community (opens new window) to chat with us directly!

    Docs

    +swapped with custom types if the user desires to do so.

    # Conclusion

    Hopefully, this article will help you get started with BDK! This is just a very quick and gentle introduction to the library, and only barely scratches the surface of what's inside: we will keep publishing more articles in the future to explain some of the more advanced features of BDK, like key generation, using complex descriptors with multiple keys and/or timelocks, using external signers, etc.

    If you'd like to learn more about the library feel free to ask any questions in the comment section down below, or join our Discord Community (opens new window) to chat with us directly!

    - + diff --git a/blog/2020/12/release-v0.2.0/index.html b/blog/2020/12/release-v0.2.0/index.html index 8d696877c9..d83bb5a614 100644 --- a/blog/2020/12/release-v0.2.0/index.html +++ b/blog/2020/12/release-v0.2.0/index.html @@ -30,7 +30,7 @@ - + @@ -128,7 +128,7 @@ .map_err(|e| KeyError::Message(e.to_string()))?) } } -

    # Support for sortedmulti()

    Thanks to the addition of sortedmulti() in rust-miniscript, we can now also support them in BDK, which means we are getting more and more compatible with other descriptor-based wallets out there like Bitcoin Core.

    # Contributors

    A huge thanks to everybody who contributed to this new release with suggestions, pull requests and bug reports.

    Since the 0.1.0-beta.1 release over three months ago, we've had 213 new commits made by 10 different contributors for a total of 9990 additions and 2993 deletions. Here's the full diff (opens new window).

    A special thanks to the 7 new contributors:

    - + diff --git a/blog/bdk-cli-basics-multisig-2of3/index.html b/blog/bdk-cli-basics-multisig-2of3/index.html index 7b54295852..73b281e510 100644 --- a/blog/bdk-cli-basics-multisig-2of3/index.html +++ b/blog/bdk-cli-basics-multisig-2of3/index.html @@ -30,7 +30,7 @@ - + @@ -126,7 +126,7 @@

    # Step 12: Broadcast Transaction

    ▶️ bdk-cli wallet --wallet wallet_name_msd01 --descriptor $MULTI_DESCRIPTOR_01 broadcast --psbt $SECONDSIG_PSBT

    {
   "txid": "61da2451874a483aa8d1d0787c7680d157639f284840de8885098cac43f6cc2f"
 }
-

    # Verify Transaction

    Verify transcation in the memory pool on testnet Mempool-testnet! (opens new window)

    - + diff --git a/blog/tags/basics/index.html b/blog/tags/basics/index.html index 8b1304d679..8b14dcec1c 100644 --- a/blog/tags/basics/index.html +++ b/blog/tags/basics/index.html @@ -25,7 +25,7 @@ - + @@ -81,6 +81,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/bdk-cli/index.html b/blog/tags/bdk-cli/index.html index 1589bb5445..d0437175ba 100644 --- a/blog/tags/bdk-cli/index.html +++ b/blog/tags/bdk-cli/index.html @@ -25,7 +25,7 @@ - + @@ -114,6 +114,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/bdk-rn/index.html b/blog/tags/bdk-rn/index.html index 99acfebfb3..8f13d03fbf 100644 --- a/blog/tags/bdk-rn/index.html +++ b/blog/tags/bdk-rn/index.html @@ -25,7 +25,7 @@ - + @@ -81,6 +81,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/bdk/index.html b/blog/tags/bdk/index.html index 4b3c57f558..b6c5d9ce23 100644 --- a/blog/tags/bdk/index.html +++ b/blog/tags/bdk/index.html @@ -25,7 +25,7 @@ - + @@ -169,6 +169,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/bindings/index.html b/blog/tags/bindings/index.html index 53d9c955dd..7a9377a4d6 100644 --- a/blog/tags/bindings/index.html +++ b/blog/tags/bindings/index.html @@ -25,7 +25,7 @@ - + @@ -81,6 +81,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/bitcoin-cli/index.html b/blog/tags/bitcoin-cli/index.html index 945609bdb0..7cbbdd7b1a 100644 --- a/blog/tags/bitcoin-cli/index.html +++ b/blog/tags/bitcoin-cli/index.html @@ -25,7 +25,7 @@ - + @@ -81,6 +81,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/bitcoin/index.html b/blog/tags/bitcoin/index.html index 359a058dd8..af7bcecbd4 100644 --- a/blog/tags/bitcoin/index.html +++ b/blog/tags/bitcoin/index.html @@ -25,7 +25,7 @@ - + @@ -92,6 +92,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/blockchain/index.html b/blog/tags/blockchain/index.html index 104d2569e8..296985e3e6 100644 --- a/blog/tags/blockchain/index.html +++ b/blog/tags/blockchain/index.html @@ -25,7 +25,7 @@ - + @@ -81,6 +81,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/coin selection/index.html b/blog/tags/coin selection/index.html index c50d7d62be..044c2d0627 100644 --- a/blog/tags/coin selection/index.html +++ b/blog/tags/coin selection/index.html @@ -25,7 +25,7 @@ - + @@ -81,6 +81,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/compact_filters/index.html b/blog/tags/compact_filters/index.html index 55a6e49c57..c58bbff01a 100644 --- a/blog/tags/compact_filters/index.html +++ b/blog/tags/compact_filters/index.html @@ -25,7 +25,7 @@ - + @@ -81,6 +81,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/descriptor/index.html b/blog/tags/descriptor/index.html index e77c3eabf6..96c4554d91 100644 --- a/blog/tags/descriptor/index.html +++ b/blog/tags/descriptor/index.html @@ -25,7 +25,7 @@ - + @@ -114,6 +114,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/development/index.html b/blog/tags/development/index.html index bb67aab7c8..971c8c8b60 100644 --- a/blog/tags/development/index.html +++ b/blog/tags/development/index.html @@ -25,7 +25,7 @@ - + @@ -103,6 +103,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/fee/index.html b/blog/tags/fee/index.html index 66991dd1ab..0a88a3d75d 100644 --- a/blog/tags/fee/index.html +++ b/blog/tags/fee/index.html @@ -25,7 +25,7 @@ - + @@ -103,6 +103,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/getting started/index.html b/blog/tags/getting started/index.html index d845fed0e8..ecb12909da 100644 --- a/blog/tags/getting started/index.html +++ b/blog/tags/getting started/index.html @@ -25,7 +25,7 @@ - + @@ -81,6 +81,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/guide/index.html b/blog/tags/guide/index.html index c626276f0d..bb79b809bc 100644 --- a/blog/tags/guide/index.html +++ b/blog/tags/guide/index.html @@ -25,7 +25,7 @@ - + @@ -125,6 +125,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/iOS/index.html b/blog/tags/iOS/index.html index a347a3ba49..72b040ed89 100644 --- a/blog/tags/iOS/index.html +++ b/blog/tags/iOS/index.html @@ -25,7 +25,7 @@ - + @@ -92,6 +92,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/index.html b/blog/tags/index.html index 010181a36b..5430a52a56 100644 --- a/blog/tags/index.html +++ b/blog/tags/index.html @@ -25,7 +25,7 @@ - + @@ -49,7 +49,7 @@ Blog GitHub - (opens new window)

    Tags

    - + diff --git a/blog/tags/miniscript/index.html b/blog/tags/miniscript/index.html index 1b6a3aab8e..e3a5707705 100644 --- a/blog/tags/miniscript/index.html +++ b/blog/tags/miniscript/index.html @@ -25,7 +25,7 @@ - + @@ -114,6 +114,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/mobile/index.html b/blog/tags/mobile/index.html index 93ba7a4f43..82f7c0cdfc 100644 --- a/blog/tags/mobile/index.html +++ b/blog/tags/mobile/index.html @@ -25,7 +25,7 @@ - + @@ -92,6 +92,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/multi-sig/index.html b/blog/tags/multi-sig/index.html index 3cea5ca64c..894601d431 100644 --- a/blog/tags/multi-sig/index.html +++ b/blog/tags/multi-sig/index.html @@ -25,7 +25,7 @@ - + @@ -81,6 +81,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/novice/index.html b/blog/tags/novice/index.html index 39284b2635..c9291cd4c7 100644 --- a/blog/tags/novice/index.html +++ b/blog/tags/novice/index.html @@ -25,7 +25,7 @@ - + @@ -81,6 +81,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/paper wallets/index.html b/blog/tags/paper wallets/index.html index 4cf0c235dd..70d20b1fc8 100644 --- a/blog/tags/paper wallets/index.html +++ b/blog/tags/paper wallets/index.html @@ -25,7 +25,7 @@ - + @@ -81,6 +81,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/project/index.html b/blog/tags/project/index.html index f9d0c606d4..0ccf60a572 100644 --- a/blog/tags/project/index.html +++ b/blog/tags/project/index.html @@ -25,7 +25,7 @@ - + @@ -81,6 +81,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/release/index.html b/blog/tags/release/index.html index f2b2ec5d7f..786b68e5a9 100644 --- a/blog/tags/release/index.html +++ b/blog/tags/release/index.html @@ -25,7 +25,7 @@ - + @@ -158,6 +158,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/rust/index.html b/blog/tags/rust/index.html index 54a02c9a60..17cafa37c2 100644 --- a/blog/tags/rust/index.html +++ b/blog/tags/rust/index.html @@ -25,7 +25,7 @@ - + @@ -169,6 +169,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/security/index.html b/blog/tags/security/index.html index 999c8abe34..dea6947eca 100644 --- a/blog/tags/security/index.html +++ b/blog/tags/security/index.html @@ -25,7 +25,7 @@ - + @@ -81,6 +81,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/summer of bitcoin/index.html b/blog/tags/summer of bitcoin/index.html index 5a47fc0313..cd863f464b 100644 --- a/blog/tags/summer of bitcoin/index.html +++ b/blog/tags/summer of bitcoin/index.html @@ -25,7 +25,7 @@ - + @@ -81,6 +81,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/taproot/index.html b/blog/tags/taproot/index.html index af5a46a2a8..6807af24f4 100644 --- a/blog/tags/taproot/index.html +++ b/blog/tags/taproot/index.html @@ -25,7 +25,7 @@ - + @@ -92,6 +92,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/tor/index.html b/blog/tags/tor/index.html index 0c3d3cb93e..d745692f32 100644 --- a/blog/tags/tor/index.html +++ b/blog/tags/tor/index.html @@ -25,7 +25,7 @@ - + @@ -81,6 +81,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/tutorial/index.html b/blog/tags/tutorial/index.html index 9c3057373d..a977f1ceef 100644 --- a/blog/tags/tutorial/index.html +++ b/blog/tags/tutorial/index.html @@ -25,7 +25,7 @@ - + @@ -147,6 +147,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/tags/wallet/index.html b/blog/tags/wallet/index.html index dc1a29603e..f091be467c 100644 --- a/blog/tags/wallet/index.html +++ b/blog/tags/wallet/index.html @@ -25,7 +25,7 @@ - + @@ -81,6 +81,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/blog/using-bdk-with-hardware-wallets/index.html b/blog/using-bdk-with-hardware-wallets/index.html index 8dd10f800a..83198d5473 100644 --- a/blog/using-bdk-with-hardware-wallets/index.html +++ b/blog/using-bdk-with-hardware-wallets/index.html @@ -30,7 +30,7 @@ - + @@ -181,7 +181,7 @@ blockchain.broadcast(&raw_transaction)?; println!("Transaction broadcasted! TXID: {txid}.\nExplorer URL: https://mempool.space/testnet/tx/{txid}", txid = txid); -

    # Conclusion

    We just received coins on a hardware wallet and spent from it - how cool is that?!

    See the hardware signer example (opens new window) for the full code, and, if you have any questions or suggestions, head to our Discord (opens new window). See you there!

    - + diff --git a/descriptors/index.html b/descriptors/index.html index 1359883145..530fadcc3e 100644 --- a/descriptors/index.html +++ b/descriptors/index.html @@ -33,7 +33,7 @@ - + @@ -63,7 +63,7 @@ aims to produce the first "Native Descriptor" Bitcoin library that can be used by developers to build their own "Native Descriptor Wallets" (opens new window).

    # Compatibility Matrix

    Below are some tables to highlight the differences between Bitcoin Core's descriptor support, rust-miniscript's one and BDK's.

    # Key Types

    Key Type BDK rust-miniscript Bitcoin Core
    Hex PublicKey ✓ ✓ ✓
    WIF PrivateKey ✓ ✗ ✓
    Extended Keys (xpub/xprv) ✓ ✗ ✓

    # Script Types (top level)

    Script Type BDK rust-miniscript Bitcoin Core
    pk() ✓ ✓ ✓
    pkh() ✓ ✓ ✓
    wpkh() ✓ ✓ ✓
    sh(wpkh()) ✓ ✓ ✓
    sh() ✓ ✓ ✓
    wsh() ✓ ✓ ✓
    sh(wsh()) ✓ ✓ ✓
    combo() ✗ ✗ ✓
    addr() ✗ ✗ ✓
    raw() ✗ ✗ ✓
    Bare scripts ✓ ✓ ✗

    # Operators

    Operator BDK rust-miniscript Bitcoin Core
    pk() ✓ ✓ ✓
    pkh() ✓ ✓ ✓
    older() ✓ ✓ ✓
    after() ✓ ✓ ✓
    sha256() ✓ ✓ ✓
    hash256() ✓ ✓ ✓
    ripemd160() ✓ ✓ ✓
    hash160() ✓ ✓ ✓
    andor() ✓ ✓ ✓
    and_{v,b,n}() ✓ ✓ ✓
    or_{b,c,d,i}() ✓ ✓ ✓
    multi() ✓ ✓ ✓
    thresh() ✓ ✓ ✓
    sortedmulti() ✓ ✓ ✓

    # Modifiers

    Script Type BDK rust-miniscript Bitcoin Core
    a: ✓ ✓ ✓
    s: ✓ ✓ ✓
    c: ✓ ✓ ✓
    t: ✓ ✓ ✓
    d: ✓ ✓ ✓
    v: ✓ ✓ ✓
    j: ✓ ✓ ✓
    n: ✓ ✓ ✓
    l: ✓ ✓ ✓
    u: ✓ ✓ ✓

    For a more thorough description of these operators and modifiers see Sipa's Miniscript Page (opens new window) and Bitcoin Core's (opens new window).

    # Examples

    Some examples of valid BDK descriptors are:

    Spending Policy Descriptor Address 0 Address 1
    Static P2PKH pkh(cSQPHDBwXGjVzWRqAHm6zfvQhaTuj1f2bFH58h55ghbjtFwvmeXR) mrkwtj5xpYQjHeJe5wsweNjVeTKkvR5fCr mrkwtj5xpYQjHeJe5wsweNjVeTKkvR5fCr
    Static P2PKH, watch-only pkh(02e96fe52ef0e22d2f131dd425ce1893073a3c6ad20e8cac36726393dfb4856a4c) mrkwtj5xpYQjHeJe5wsweNjVeTKkvR5fCr mrkwtj5xpYQjHeJe5wsweNjVeTKkvR5fCr
    P2WSH 2-of-2 with one private key wsh(multi(2,tprv8ZgxMBicQKsPePmENhT9N9yiSfTtDoC1f39P7nNmgEyCB6Nm4Qiv1muq4CykB9jtnQg2VitBrWh8PJU8LHzoGMHTrS2VKBSgAz7Ssjf9S3P/0/*,tpubDBYDcH8P2PedrEN3HxWYJJJMZEdgnrqMsjeKpPNzwe7jmGwk5M3HRdSf5vudAXwrJPfUsfvUPFooKWmz79Lh111U51RNotagXiGNeJe3i6t/1/*)) tb1qqsat6c82fvdy73rfzye8f7nwxcz3xny7t56azl73g95mt3tmzvgs9a8vjs tb1q7sgx6gscgtau57jduend6a8l445ahpk3dt3u5zu58rx5qm27lhkqgfdjdr
    P2WSH-P2SH one key + 10 days timelock sh(wsh(and_v(vc:pk_h(tprv8ZgxMBicQKsPePmENhT9N9yiSfTtDoC1f39P7nNmgEyCB6Nm4Qiv1muq4CykB9jtnQg2VitBrWh8PJU8LHzoGMHTrS2VKBSgAz7Ssjf9S3P/0/*),older(1440)))) 2Mtk2nyS98MCi2P7TkoBGLaJviBy956XxB1 2MuEStKzYhqb5HCFgHz9153tZsL5sVqV5xC

    # Implementation Details

    BDK extends the capabilities of rust-miniscript (opens new window) by introducing the concept of an ExtendedDescriptor: it represents a descriptor that contains one or more "derivable keys" like xpubs or xprvs and can be "derived" from a normal Descriptor by deriving every single one of its keys. It is currently called "StringDescriptor" in the code, because it's implemented as a wrapped miniscript::Descriptor<String>.

    ExtendedDescriptors are derived using a single index instead of a full derivation path: this is because normally most of the path is fixed and can be represented right after the xpub/xprv itself, and only the final index changes for each address. This is what's normally called a DescriptorExtendedKey in the codebase, it is represented with a similar syntax to Bitcoin Core's, such as:

    [d34db33f/44'/0'/0']xpub6ERApfZwUNrhL.......rBGRjaDMzQLcgJvLJuZZvRcEL/0/*
-

    +

    ←

    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/docs-rs/bdk/nightly/latest/bdk/descriptor/enum.Descriptor.html b/docs-rs/bdk/nightly/latest/bdk/descriptor/enum.Descriptor.html index 335189acc4..7a41b07e25 100644 --- a/docs-rs/bdk/nightly/latest/bdk/descriptor/enum.Descriptor.html +++ b/docs-rs/bdk/nightly/latest/bdk/descriptor/enum.Descriptor.html @@ -169,10 +169,10 @@
    Examples
    assert_eq!(result.to_string(), "tr(03cc8a4bc64d897bddc5fbc2f670f7a8ba0b386779106cf1223c6fc5d7cd6fc115)#6qm9h8ym");
    Errors

    This function will return an error if hardened derivation is attempted.

    -

    Trait Implementations§

    Returns a copy of the value. Read more
    Performs copy-assignment from source. Read more
    Formats the value using the given formatter. Read more
    Returns the minimum value (in satoshis) at which an output is broadcastable. -Panics if the descriptor wildcard is hardened. Read more
    Deserialize this value from the given Serde deserializer. Read more
    Formats the value using the given formatter. Read more
    Extract the spending policy
    Run a predicate on every key in the descriptor, returning whether +

    Trait Implementations§

    Returns a copy of the value. Read more
    Performs copy-assignment from source. Read more
    Formats the value using the given formatter. Read more
    Returns the minimum value (in satoshis) at which an output is broadcastable. +Panics if the descriptor wildcard is hardened. Read more
    Deserialize this value from the given Serde deserializer. Read more
    Formats the value using the given formatter. Read more
    Extract the spending policy
    Run a predicate on every key in the descriptor, returning whether the predicate returned true for every key Read more
    Run a predicate on every key in the descriptor, returning whether -the predicate returned true for any key Read more
    Converts to this type from the input type.
    Converts to this type from the input type.
    Converts to this type from the input type.
    Converts to this type from the input type.
    Converts to this type from the input type.
    Converts to this type from the input type.
    The associated error which can be returned from parsing.
    Parses a string s to return a value of this type. Read more

    Parse an expression tree into a descriptor.

    +the predicate returned true for any key Read more
    Converts to this type from the input type.
    Converts to this type from the input type.
    Converts to this type from the input type.
    Converts to this type from the input type.
    Converts to this type from the input type.
    Converts to this type from the input type.
    The associated error which can be returned from parsing.
    Parses a string s to return a value of this type. Read more

    Parse an expression tree into a descriptor.

    Feeds this value into the given Hasher. Read more
    Feeds a slice of this type into the given Hasher. Read more
    Convert the object into an abstract policy
    This method returns an Ordering between self and other. Read more
    Compares and returns the maximum of two values. Read more
    Compares and returns the minimum of two values. Read more
    Restrict a value to a certain interval. Read more
    This method tests for self and other values to be equal, and is used by ==. Read more
    This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason. Read more
    This method returns an ordering between self and other values if one exists. Read more
    This method tests less than (for self and other) and is used by the < operator. Read more
    This method tests less than or equal to (for self and other) and is used by the <= diff --git a/docs-rs/bdk/nightly/latest/bdk/index.html b/docs-rs/bdk/nightly/latest/bdk/index.html index 88a2f6eb98..3311ae48d2 100644 --- a/docs-rs/bdk/nightly/latest/bdk/index.html +++ b/docs-rs/bdk/nightly/latest/bdk/index.html @@ -167,4 +167,4 @@

    Contribution

    submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

    -

    Re-exports

    pub extern crate bitcoin;
    pub extern crate miniscript;
    pub use descriptor::template;
    pub use descriptor::HdKeyPaths;
    pub use wallet::signer;
    pub use wallet::signer::SignOptions;
    pub use wallet::tx_builder::TxBuilder;
    pub use wallet::Wallet;
    pub use bdk_chain as chain;

    Modules

    descriptor
    Descriptors
    keys
    Key formats
    psbt
    Additional functions on the rust-bitcoin PartiallySignedTransaction structure.
    wallet
    Wallet

    Macros

    descriptor
    Macro to write full descriptors with code
    fragment
    Macro to write descriptor fragments with code

    Structs

    LocalOutput
    An unspent output owned by a Wallet.
    WeightedUtxo
    A Utxo with its satisfaction_weight.

    Enums

    KeychainKind
    Types of keychains
    Utxo
    An unspent transaction output (UTXO).

    Functions

    version
    Get the version of BDK at runtime
    \ No newline at end of file +

    Re-exports

    pub extern crate bitcoin;
    pub extern crate miniscript;
    pub use descriptor::template;
    pub use descriptor::HdKeyPaths;
    pub use wallet::signer;
    pub use wallet::signer::SignOptions;
    pub use wallet::tx_builder::TxBuilder;
    pub use wallet::Wallet;
    pub use bdk_chain as chain;

    Modules

    descriptor
    Descriptors
    keys
    Key formats
    psbt
    Additional functions on the rust-bitcoin PartiallySignedTransaction structure.
    wallet
    Wallet

    Macros

    descriptor
    Macro to write full descriptors with code
    fragment
    Macro to write descriptor fragments with code

    Structs

    LocalOutput
    An unspent output owned by a Wallet.
    WeightedUtxo
    A Utxo with its satisfaction_weight.

    Enums

    KeychainKind
    Types of keychains
    Utxo
    An unspent transaction output (UTXO).

    Functions

    version
    Get the version of BDK at runtime
    \ No newline at end of file diff --git a/docs-rs/bdk/nightly/latest/bdk/struct.LocalOutput.html b/docs-rs/bdk/nightly/latest/bdk/struct.LocalOutput.html index f10c54b56f..4b6d906a78 100644 --- a/docs-rs/bdk/nightly/latest/bdk/struct.LocalOutput.html +++ b/docs-rs/bdk/nightly/latest/bdk/struct.LocalOutput.html @@ -5,14 +5,14 @@ pub keychain: KeychainKind, pub is_spent: bool, pub derivation_index: u32, - pub confirmation_time: ConfirmationTime, + pub confirmation_time: ConfirmationTime, }
    Expand description

    An unspent output owned by a Wallet.

    Fields§

    §outpoint: OutPoint

    Reference to a transaction output

    §txout: TxOut

    Transaction output

    §keychain: KeychainKind

    Type of keychain

    §is_spent: bool

    Whether this UTXO is spent or not

    §derivation_index: u32

    The derivation index for the script pubkey in the wallet

    -
    §confirmation_time: ConfirmationTime

    The confirmation time for transaction containing this utxo

    +
    §confirmation_time: ConfirmationTime

    The confirmation time for transaction containing this utxo

    Trait Implementations§

    Returns a copy of the value. Read more
    Performs copy-assignment from source. Read more
    Formats the value using the given formatter. Read more
    Deserialize this value from the given Serde deserializer. Read more
    Feeds this value into the given Hasher. Read more
    Feeds a slice of this type into the given Hasher. Read more
    This method tests for self and other values to be equal, and is used by ==. Read more
    This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason. Read more
    Serialize this value into the given Serde serializer. Read more

    Auto Trait Implementations§

    Blanket Implementations§

    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more

    Returns the argument unchanged.

    diff --git a/docs-rs/bdk/nightly/latest/bdk/wallet/enum.ApplyBlockError.html b/docs-rs/bdk/nightly/latest/bdk/wallet/enum.ApplyBlockError.html index 202c59861a..08c05e5ebd 100644 --- a/docs-rs/bdk/nightly/latest/bdk/wallet/enum.ApplyBlockError.html +++ b/docs-rs/bdk/nightly/latest/bdk/wallet/enum.ApplyBlockError.html @@ -1,12 +1,12 @@ ApplyBlockError in bdk::wallet - Rust

    Enum bdk::wallet::ApplyBlockError

    source · 
    pub enum ApplyBlockError {
-    CannotConnect(CannotConnectError),
+    CannotConnect(CannotConnectError),
     UnexpectedConnectedToHash {
         connected_to_hash: BlockHash,
         expected_hash: BlockHash,
     },
 }
    Expand description

    An error that may occur when applying a block to Wallet.

    -

    Variants§

    §

    CannotConnect(CannotConnectError)

    Occurs when the update chain cannot connect with original chain.

    +

    Variants§

    §

    CannotConnect(CannotConnectError)

    Occurs when the update chain cannot connect with original chain.

    §

    UnexpectedConnectedToHash

    Fields

    §connected_to_hash: BlockHash

    Block hash of connected_to.

    §expected_hash: BlockHash

    Expected block hash of connected_to, as derived from block.

    Occurs when the connected_to hash does not match the hash derived from block.

    diff --git a/docs-rs/bdk/nightly/latest/bdk/wallet/fn.wallet_name_from_descriptor.html b/docs-rs/bdk/nightly/latest/bdk/wallet/fn.wallet_name_from_descriptor.html index d83770bc8c..a65fefa5b8 100644 --- a/docs-rs/bdk/nightly/latest/bdk/wallet/fn.wallet_name_from_descriptor.html +++ b/docs-rs/bdk/nightly/latest/bdk/wallet/fn.wallet_name_from_descriptor.html @@ -1,4 +1,4 @@ wallet_name_from_descriptor in bdk::wallet - Rust

    Function bdk::wallet::wallet_name_from_descriptor

    source · 
    pub fn wallet_name_from_descriptor<T>(
        descriptor: T,
        change_descriptor: Option<T>,
        network: Network,
        secp: &Secp256k1<All>
    ) -> Result<String, DescriptorError>where
        T: IntoWalletDescriptor,
    Expand description

    Deterministically generate a unique name given the descriptors defining the wallet

    + logo

    In bdk::wallet

    Function bdk::wallet::wallet_name_from_descriptor

    source · 
    pub fn wallet_name_from_descriptor<T>(
        descriptor: T,
        change_descriptor: Option<T>,
        network: Network,
        secp: &Secp256k1<All>
    ) -> Result<String, DescriptorError>where
        T: IntoWalletDescriptor,
    Expand description

    Deterministically generate a unique name given the descriptors defining the wallet

    Compatible with wallet_name_from_descriptor

    \ No newline at end of file diff --git a/docs-rs/bdk/nightly/latest/bdk/wallet/index.html b/docs-rs/bdk/nightly/latest/bdk/wallet/index.html index 49c8e84ada..5a1f53bc74 100644 --- a/docs-rs/bdk/nightly/latest/bdk/wallet/index.html +++ b/docs-rs/bdk/nightly/latest/bdk/wallet/index.html @@ -1,5 +1,5 @@ bdk::wallet - Rust

    Module bdk::wallet

    source ·
    Expand description

    Wallet

    + logo

    Module wallet

    Module bdk::wallet

    source ·
    Expand description

    Wallet

    This module defines the Wallet.

    Modules

    coin_selection
    Coin selection
    error
    Errors that can be thrown by the Wallet
    export
    Wallet export
    signer
    Generalized signers
    tx_builder
    Transaction builder

    Structs

    AddressInfo
    A derived address and the index it was found at. For convenience this automatically derefs to Address
    Balance
    Balance, differentiated into various categories.
    ChangeSet
    The changes made to a wallet by applying an Update.
    Update
    An update to Wallet.
    Wallet
    A Bitcoin wallet

    Enums

    AddressIndex
    The address index selection strategy to use to derived an address from the wallet’s external diff --git a/docs-rs/bdk/nightly/latest/bdk/wallet/struct.Balance.html b/docs-rs/bdk/nightly/latest/bdk/wallet/struct.Balance.html index 412deea90d..5e3c1aaa12 100644 --- a/docs-rs/bdk/nightly/latest/bdk/wallet/struct.Balance.html +++ b/docs-rs/bdk/nightly/latest/bdk/wallet/struct.Balance.html @@ -1,5 +1,5 @@ Balance in bdk::wallet - Rust

    Struct bdk::wallet::Balance

    source · 
    pub struct Balance {
+                    logo

    Balance

    Fields

    Methods

    Trait Implementations

    Auto Trait Implementations

    Blanket Implementations

    In bdk::wallet

    Struct bdk::wallet::Balance

    pub struct Balance {
     pub immature: u64,
     pub trusted_pending: u64,
     pub untrusted_pending: u64,
@@ -9,13 +9,13 @@
    §trusted_pending: u64

    Unconfirmed UTXOs generated by a wallet tx

    §untrusted_pending: u64

    Unconfirmed UTXOs received from an external wallet

    §confirmed: u64

    Confirmed and immediately spendable balance

    -

    Implementations§

    Get sum of trusted_pending and confirmed coins.

    +

    Implementations§

    Get sum of trusted_pending and confirmed coins.

    This is the balance you can spend right now that shouldn’t get cancelled via another party double spending it.

    -

    Get the whole balance visible to the wallet.

    -

    Trait Implementations§

    The resulting type after applying the + operator.
    Performs the + operation. Read more
    Returns a copy of the value. Read more
    Performs copy-assignment from source. Read more
    Formats the value using the given formatter. Read more
    Returns the “default value” for a type. Read more
    Deserialize this value from the given Serde deserializer. Read more
    Formats the value using the given formatter. Read more
    This method tests for self and other values to be equal, and is used +

    Get the whole balance visible to the wallet.

    +

    Trait Implementations§

    The resulting type after applying the + operator.
    Performs the + operation. Read more
    Returns a copy of the value. Read more
    Performs copy-assignment from source. Read more
    Formats the value using the given formatter. Read more
    Returns the “default value” for a type. Read more
    Deserialize this value from the given Serde deserializer. Read more
    Formats the value using the given formatter. Read more
    This method tests for self and other values to be equal, and is used by ==. Read more
    This method tests for !=. The default implementation is almost always -sufficient, and should not be overridden without very good reason. Read more
    Serialize this value into the given Serde serializer. Read more

    Auto Trait Implementations§

    Blanket Implementations§

    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more

    Returns the argument unchanged.

    +sufficient, and should not be overridden without very good reason. Read more
    Serialize this value into the given Serde serializer. Read more

    Auto Trait Implementations§

    Blanket Implementations§

    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more

    Returns the argument unchanged.

    Calls U::from(self).

    That is, this conversion is whatever the implementation of From<T> for U chooses to do.

    diff --git a/docs-rs/bdk/nightly/latest/bdk/wallet/struct.ChangeSet.html b/docs-rs/bdk/nightly/latest/bdk/wallet/struct.ChangeSet.html index f5962751ed..9baea2aba8 100644 --- a/docs-rs/bdk/nightly/latest/bdk/wallet/struct.ChangeSet.html +++ b/docs-rs/bdk/nightly/latest/bdk/wallet/struct.ChangeSet.html @@ -1,13 +1,13 @@ ChangeSet in bdk::wallet - Rust

    Struct bdk::wallet::ChangeSet

    source · 
    pub struct ChangeSet {
-    pub chain: ChangeSet,
-    pub indexed_tx_graph: ChangeSet<ConfirmationTimeHeightAnchor, ChangeSet<KeychainKind>>,
+    pub chain: ChangeSet,
+    pub indexed_tx_graph: ChangeSet<ConfirmationTimeHeightAnchor, ChangeSet<KeychainKind>>,
     pub network: Option<Network>,
 }
    Expand description

    The changes made to a wallet by applying an Update.

    -

    Fields§

    §chain: ChangeSet

    Changes to the LocalChain.

    -
    §indexed_tx_graph: ChangeSet<ConfirmationTimeHeightAnchor, ChangeSet<KeychainKind>>

    Changes to IndexedTxGraph.

    +

    Fields§

    §chain: ChangeSet

    Changes to the LocalChain.

    +
    §indexed_tx_graph: ChangeSet<ConfirmationTimeHeightAnchor, ChangeSet<KeychainKind>>

    Changes to IndexedTxGraph.

    §network: Option<Network>

    Stores the network type of the wallet.

    -

    Trait Implementations§

    Append another object of the same type onto self.
    Returns whether the structure is considered empty.
    Returns a copy of the value. Read more
    Performs copy-assignment from source. Read more
    Formats the value using the given formatter. Read more
    Returns the “default value” for a type. Read more
    Deserialize this value from the given Serde deserializer. Read more
    Converts to this type from the input type.
    Converts to this type from the input type.
    This method tests for self and other values to be equal, and is used +

    Trait Implementations§

    Append another object of the same type onto self.
    Returns whether the structure is considered empty.
    Returns a copy of the value. Read more
    Performs copy-assignment from source. Read more
    Formats the value using the given formatter. Read more
    Returns the “default value” for a type. Read more
    Deserialize this value from the given Serde deserializer. Read more
    Converts to this type from the input type.
    Converts to this type from the input type.
    This method tests for self and other values to be equal, and is used by ==. Read more
    This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason. Read more
    Serialize this value into the given Serde serializer. Read more

    Auto Trait Implementations§

    Blanket Implementations§

    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more

    Returns the argument unchanged.

    Calls U::from(self).

    diff --git a/docs-rs/bdk/nightly/latest/bdk/wallet/struct.Update.html b/docs-rs/bdk/nightly/latest/bdk/wallet/struct.Update.html index 36b90e7b75..acc4c3b32d 100644 --- a/docs-rs/bdk/nightly/latest/bdk/wallet/struct.Update.html +++ b/docs-rs/bdk/nightly/latest/bdk/wallet/struct.Update.html @@ -1,14 +1,14 @@ Update in bdk::wallet - Rust

    Struct bdk::wallet::Update

    source · 
    pub struct Update {
     pub last_active_indices: BTreeMap<KeychainKind, u32>,
-    pub graph: TxGraph<ConfirmationTimeHeightAnchor>,
-    pub chain: Option<Update>,
+    pub graph: TxGraph<ConfirmationTimeHeightAnchor>,
+    pub chain: Option<Update>,
 }
    Expand description

    An update to Wallet.

    -

    It updates bdk_chain::keychain::KeychainTxOutIndex, bdk_chain::TxGraph and local_chain::LocalChain atomically.

    +

    It updates [bdk_chain::keychain::KeychainTxOutIndex], [bdk_chain::TxGraph] and [local_chain::LocalChain] atomically.

    Fields§

    §last_active_indices: BTreeMap<KeychainKind, u32>

    Contains the last active derivation indices per keychain (K), which is used to update the -KeychainTxOutIndex.

    -
    §graph: TxGraph<ConfirmationTimeHeightAnchor>

    Update for the wallet’s internal TxGraph.

    -
    §chain: Option<Update>

    Update for the wallet’s internal LocalChain.

    +[KeychainTxOutIndex].

    +
    §graph: TxGraph<ConfirmationTimeHeightAnchor>

    Update for the wallet’s internal [TxGraph].

    +
    §chain: Option<Update>

    Update for the wallet’s internal LocalChain.

    Trait Implementations§

    Returns a copy of the value. Read more
    Performs copy-assignment from source. Read more
    Formats the value using the given formatter. Read more
    Returns the “default value” for a type. Read more

    Auto Trait Implementations§

    Blanket Implementations§

    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more

    Returns the argument unchanged.

    Calls U::from(self).

    That is, this conversion is whatever the implementation of diff --git a/docs-rs/bdk/nightly/latest/bdk/wallet/struct.Wallet.html b/docs-rs/bdk/nightly/latest/bdk/wallet/struct.Wallet.html index 86218809c3..a6ff301b78 100644 --- a/docs-rs/bdk/nightly/latest/bdk/wallet/struct.Wallet.html +++ b/docs-rs/bdk/nightly/latest/bdk/wallet/struct.Wallet.html @@ -8,7 +8,7 @@

    Implementations§

    Creates a wallet that does not persist data.

    Creates a wallet that does not persist data, with a custom genesis hash.

    -

    Infallibly return a derived address using the external descriptor, see AddressIndex for +

    Infallibly return a derived address using the external descriptor, see AddressIndex for available address index selection strategies. If none of the keys in the descriptor are derivable (i.e. does not end with /*) then the same address will always be returned for any AddressIndex.

    Panics
    @@ -22,21 +22,21 @@
    Panics
    Panics

    This panics when the caller requests for an address of derivation index greater than the BIP32 max index.

    -

    Initialize an empty Wallet.

    -

    Initialize an empty Wallet with a custom genesis hash.

    +

    Initialize an empty Wallet.

    +

    Initialize an empty Wallet with a custom genesis hash.

    This is like Wallet::new with an additional genesis_hash parameter. This is useful for syncing from alternative networks.

    -

    Load Wallet from the given persistence backend.

    -

    Either loads Wallet from persistence, or initializes it if it does not exist.

    +

    Load Wallet from the given persistence backend.

    +

    Either loads Wallet from persistence, or initializes it if it does not exist.

    This method will fail if the loaded Wallet has different parameters to those provided.

    -

    Either loads Wallet from persistence, or initializes it if it does not exist (with a +

    Either loads Wallet from persistence, or initializes it if it does not exist (with a custom genesis hash).

    This method will fail if the loaded Wallet has different parameters to those provided. This is like Wallet::new_or_load with an additional genesis_hash parameter. This is useful for syncing from alternative networks.

    Get the Bitcoin network the wallet is using.

    Iterator over all keychains in this wallet

    -

    Return a derived address using the external descriptor, see AddressIndex for +

    Return a derived address using the external descriptor, see AddressIndex for available address index selection strategies. If none of the keys in the descriptor are derivable (i.e. does not end with /*) then the same address will always be returned for any AddressIndex.

    A PersistBackend<ChangeSet>::WriteError will result if unable to persist the new address @@ -44,7 +44,7 @@

    Panics
    Panics

    This panics when the caller requests for an address of derivation index greater than the BIP32 max index.

    -

    Return a derived address using the internal (change) descriptor.

    +

    Return a derived address using the internal (change) descriptor.

    If the wallet doesn’t have an internal descriptor it will use the external descriptor.

    A PersistBackend<ChangeSet>::WriteError will result if unable to persist the new address to the PersistBackend.

    @@ -60,8 +60,8 @@
    Panics

    Return the list of unspent outputs of this wallet

    List all relevant outputs (includes both spent and unspent, confirmed and unconfirmed).

    To list only unspent outputs (UTXOs), use Wallet::list_unspent instead.

    -

    Get all the checkpoints the wallet is currently storing indexed by height.

    -

    Returns the latest checkpoint.

    +

    Get all the checkpoints the wallet is currently storing indexed by height.

    +

    Returns the latest checkpoint.

    Get unbounded script pubkey iterators for both Internal and External keychains.

    This is intended to be used when doing a full scan of your addresses (e.g. after restoring from seed words). You pass the BTreeMap of iterators to a blockchain data source (e.g. @@ -72,14 +72,14 @@

    Panics

    See all_unbounded_spk_iters for more documentation

    Returns the utxo owned by this wallet corresponding to outpoint if it exists in the wallet’s database.

    -

    Inserts a [TxOut] at [OutPoint] into the wallet’s transaction graph.

    +

    Inserts a [TxOut] at [OutPoint] into the wallet’s transaction graph.

    This is used for providing a previous output’s value so that we can use calculate_fee or calculate_fee_rate on a given transaction. Outputs inserted with this method will not be returned in list_unspent or list_output.

    Any inserted TxOuts are not persisted until commit is called.

    WARNING: This should only be used to add TxOuts that the wallet does not own. Only insert TxOuts that you trust the values for!

    -

    Calculates the fee of a given transaction. Returns 0 if tx is a coinbase transaction.

    +

    Calculates the fee of a given transaction. Returns 0 if tx is a coinbase transaction.

    To calculate the fee for a [Transaction] with inputs not owned by this wallet you must manually insert the TxOut(s) into the tx graph using the insert_txout function.

    Note tx does not have to be in the graph for this to work.

    @@ -89,7 +89,7 @@
    Examples
    let tx = &psbt.clone().extract_tx();
 let fee = wallet.calculate_fee(tx).expect("fee");
    -

    Calculate the [FeeRate] for a given transaction.

    +

    Calculate the [FeeRate] for a given transaction.

    To calculate the fee rate for a [Transaction] with inputs not owned by this wallet you must manually insert the TxOut(s) into the tx graph using the insert_txout function.

    Note tx does not have to be in the graph for this to work.

    @@ -109,12 +109,12 @@
    Examples
    let tx = &psbt.clone().extract_tx();
 let (sent, received) = wallet.sent_and_received(tx);
    -

    Get a single transaction from the wallet as a CanonicalTx (if the transaction exists).

    +

    Get a single transaction from the wallet as a [CanonicalTx] (if the transaction exists).

    CanonicalTx contains the full transaction alongside meta-data such as:

      -
    • Blocks that the transaction is Anchored in. These may or may not be blocks that exist +
    • Blocks that the transaction is Anchored in. These may or may not be blocks that exist in the best chain.
      • -
    • The ChainPosition of the transaction in the best chain - whether the transaction is +
    • The [ChainPosition] of the transaction in the best chain - whether the transaction is confirmed or unconfirmed. If the transaction is confirmed, the anchor which proves the confirmation is provided. If the transaction is unconfirmed, the unix timestamp of when the transaction was last seen in the mempool is provided.
      • @@ -147,11 +147,11 @@
      Examples
      last_seen, ), }
    -

    Add a new checkpoint to the wallet’s internal view of the chain. +

    Add a new checkpoint to the wallet’s internal view of the chain. This stages but does not commit the change.

    Returns whether anything changed with the insertion (e.g. false if checkpoint was already there).

    -

    Add a transaction to the wallet’s internal view of the chain. This stages but does not +

    Add a transaction to the wallet’s internal view of the chain. This stages but does not commit the change.

    Returns whether anything changed with the transaction insertion (e.g. false if the transaction was already inserted at the same position).

    @@ -161,12 +161,12 @@
    Examples

    WARNING: If position is confirmed, we anchor the tx to a the lowest checkpoint that is >= the position’s height. The caller is responsible for ensuring the tx exists in our local view of the best chain’s history.

    -

    Iterate over the transactions in the wallet.

    -

    Return the balance, separated into available, trusted-pending, untrusted-pending and immature +

    Iterate over the transactions in the wallet.

    +

    Return the balance, separated into available, trusted-pending, untrusted-pending and immature values.

    -

    Add an external signer

    +

    Add an external signer

    See the signer module for an example.

    -

    Get the signers

    +

    Get the signers

    Example
    let wallet = Wallet::new_no_persist("wpkh(tprv8ZgxMBicQKsPe73PBRSmNbTfbcsZnwWhz5eVmhHpi31HW29Z7mc9B4cWGRQzopNUzZUT391DeDJxL2PefNunWyLgqCKRMDkU1s2s8bAfoSk/84'/0'/0'/0/*)", None, Network::Testnet)?;
 for secret_key in wallet.get_signers(KeychainKind::External).signers().iter().filter_map(|s| s.descriptor_secret_key()) {
@@ -175,7 +175,7 @@ 
    Example
    
 }
 
 Ok::<(), Box<dyn std::error::Error>>(())
    -

    Start building a transaction.

    +

    Start building a transaction.

    This returns a blank TxBuilder from which you can specify the parameters for the transaction.

    Example
    let psbt = {
@@ -186,7 +186,7 @@ 
    Example
    
 };
 
 // sign and broadcast ...
    -

    Bump the fee of a transaction previously created with this wallet.

    +

    Bump the fee of a transaction previously created with this wallet.

    Returns an error if the transaction is already confirmed or doesn’t explicitly signal replace by fee (RBF). If the transaction can be fee bumped then it returns a TxBuilder pre-populated with the inputs and outputs of the original transaction.

    @@ -211,7 +211,7 @@
    Example
    let _ = wallet.sign(&mut psbt, SignOptions::default())?; let fee_bumped_tx = psbt.extract_tx(); // broadcast fee_bumped_tx to replace original
    -

    Sign a transaction with all the wallet’s signers, in the order specified by every signer’s +

    Sign a transaction with all the wallet’s signers, in the order specified by every signer’s SignerOrdering. This function returns the Result type with an encapsulated bool that has the value true if the PSBT was finalized, or false otherwise.

    The SignOptions can be used to tweak the behavior of the software signers, and the way the transaction is finalized at the end. Note that it can’t be guaranteed that every @@ -225,52 +225,52 @@

    Example
    }; let finalized = wallet.sign(&mut psbt, SignOptions::default())?; assert!(finalized, "we should have signed all the inputs");
    -

    Return the spending policies for the wallet’s descriptor

    -

    Return the “public” version of the wallet’s descriptor, meaning a new descriptor that has +

    Return the spending policies for the wallet’s descriptor

    +

    Return the “public” version of the wallet’s descriptor, meaning a new descriptor that has the same structure but with every secret key removed

    This can be used to build a watch-only version of a wallet

    -

    Finalize a PSBT, i.e., for each input determine if sufficient data is available to pass +

    Finalize a PSBT, i.e., for each input determine if sufficient data is available to pass validation and construct the respective scriptSig or scriptWitness. Please refer to BIP174 for further information.

    Returns true if the PSBT could be finalized, and false otherwise.

    The SignOptions can be used to tweak the behavior of the finalizer.

    -

    Return the secp256k1 context used for all signing operations

    -

    Returns the descriptor used to create addresses for a particular keychain.

    -

    The derivation index of this wallet. It will return None if it has not derived any addresses. +

    Return the secp256k1 context used for all signing operations

    +

    Returns the descriptor used to create addresses for a particular keychain.

    +

    The derivation index of this wallet. It will return None if it has not derived any addresses. Otherwise, it will return the index of the highest address it has derived.

    -

    The index of the next address that you would get if you were to ask the wallet for a new address

    -

    Informs the wallet that you no longer intend to broadcast a tx that was built from it.

    +

    The index of the next address that you would get if you were to ask the wallet for a new address

    +

    Informs the wallet that you no longer intend to broadcast a tx that was built from it.

    This frees up the change address used when creating the tx for use in future transactions.

    -

    get the corresponding PSBT Input for a LocalUtxo

    -

    Return the checksum of the public descriptor associated to keychain

    +

    get the corresponding PSBT Input for a LocalUtxo

    +

    Return the checksum of the public descriptor associated to keychain

    Internally calls Self::get_descriptor_for_keychain to fetch the right descriptor

    -

    Applies an update to the wallet and stages the changes (but does not commit them).

    +

    Applies an update to the wallet and stages the changes (but does not commit them).

    Usually you create an update by interacting with some blockchain data source and inserting transactions related to your wallet into it.

    -

    Commits all currently staged changed to the persistence backend returning and error when +

    Commits all currently staged changed to the persistence backend returning and error when this fails.

    This returns whether the update resulted in any changes.

    -

    Returns the changes that will be committed with the next call to commit.

    -

    Get a reference to the inner TxGraph.

    -

    Get a reference to the inner KeychainTxOutIndex.

    -

    Get a reference to the inner LocalChain.

    -

    Introduces a block of height to the wallet, and tries to connect it to the +

    Returns the changes that will be committed with the next call to commit.

    +

    Get a reference to the inner [TxGraph].

    +

    Get a reference to the inner [KeychainTxOutIndex].

    +

    Get a reference to the inner [LocalChain].

    +

    Introduces a block of height to the wallet, and tries to connect it to the prev_blockhash of the block’s header.

    This is a convenience method that is equivalent to calling apply_block_connected_to with prev_blockhash and height-1 as the connected_to parameter.

    -

    Applies relevant transactions from block of height to the wallet, and connects the +

    Applies relevant transactions from block of height to the wallet, and connects the block to the internal chain.

    The connected_to parameter informs the wallet how this block connects to the internal -LocalChain. Relevant transactions are filtered from the block and inserted into the -internal TxGraph.

    -

    Apply relevant unconfirmed transactions to the wallet.

    +[LocalChain]. Relevant transactions are filtered from the block and inserted into the +internal [TxGraph].

    +

    Apply relevant unconfirmed transactions to the wallet.

    Transactions that are not relevant are filtered out.

    This method takes in an iterator of (tx, last_seen) where last_seen is the timestamp of when the transaction was last seen in the mempool. This is used for conflict resolution when there is conflicting unconfirmed transactions. The transaction with the later last_seen is prioritized.

    -

    Trait Implementations§

    Converts this type into a shared reference of the (usually inferred) input type.
    Formats the value using the given formatter. Read more

    Auto Trait Implementations§

    Blanket Implementations§

    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more

    Returns the argument unchanged.

    +

    Trait Implementations§

    Converts this type into a shared reference of the (usually inferred) input type.
    Formats the value using the given formatter. Read more

    Auto Trait Implementations§

    Blanket Implementations§

    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more

    Returns the argument unchanged.

    Calls U::from(self).

    That is, this conversion is whatever the implementation of From<T> for U chooses to do.

    diff --git a/docs-rs/bdk/nightly/latest/bdk/wallet/tx_builder/struct.TxBuilder.html b/docs-rs/bdk/nightly/latest/bdk/wallet/tx_builder/struct.TxBuilder.html index 501af9c524..7b89336676 100644 --- a/docs-rs/bdk/nightly/latest/bdk/wallet/tx_builder/struct.TxBuilder.html +++ b/docs-rs/bdk/nightly/latest/bdk/wallet/tx_builder/struct.TxBuilder.html @@ -196,7 +196,7 @@
    Errors

    In both cases, if you don’t provide a current height, we use the last sync height.

    Set whether or not the dust limit is checked.

    Note: by avoiding a dust limit check you may end up with a transaction that is non-standard.

    -

    Finish building the transaction.

    +

    Finish building the transaction.

    Returns a new [Psbt] per BIP174.

    Replace the recipients already added with a new list

    Add a recipient to the internal list

    diff --git a/docs-rs/bdk/nightly/latest/bdk_bitcoind_rpc/struct.BlockEvent.html b/docs-rs/bdk/nightly/latest/bdk_bitcoind_rpc/struct.BlockEvent.html index 8c40bf3c0f..96fa8fd92c 100644 --- a/docs-rs/bdk/nightly/latest/bdk_bitcoind_rpc/struct.BlockEvent.html +++ b/docs-rs/bdk/nightly/latest/bdk_bitcoind_rpc/struct.BlockEvent.html @@ -1,18 +1,18 @@ BlockEvent in bdk_bitcoind_rpc - Rust

    Struct bdk_bitcoind_rpc::BlockEvent

    source · 
    pub struct BlockEvent<B> {
     pub block: B,
-    pub checkpoint: CheckPoint,
+    pub checkpoint: CheckPoint,
 }
    Expand description

    A newly emitted block from Emitter.

    Fields§

    §block: B

    Either a full [Block] or [Header] of the new block.

    -
    §checkpoint: CheckPoint

    The checkpoint of the new block.

    -

    A CheckPoint is a node of a linked list of BlockIds. This checkpoint is linked to -all BlockIds originally passed in Emitter::new as well as emitted blocks since then. +

    §checkpoint: CheckPoint

    The checkpoint of the new block.

    +

    A [CheckPoint] is a node of a linked list of [BlockId]s. This checkpoint is linked to +all [BlockId]s originally passed in Emitter::new as well as emitted blocks since then. These blocks are guaranteed to be of the same chain.

    This is important as BDK structures require block-to-apply to be connected with another block in the original chain.

    Implementations§

    The block height of this new block.

    The block hash of this new block.

    -

    The BlockId of a previous block that this block connects to.

    -

    This either returns a BlockId of a previously emitted block or from the chain we started +

    The [BlockId] of a previous block that this block connects to.

    +

    This either returns a [BlockId] of a previously emitted block or from the chain we started with (passed in as last_cp in Emitter::new).

    This value is derived from BlockEvent::checkpoint.

    Trait Implementations§

    Formats the value using the given formatter. Read more

    Auto Trait Implementations§

    Blanket Implementations§

    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more

    Returns the argument unchanged.

    diff --git a/docs-rs/bdk/nightly/latest/bdk_bitcoind_rpc/struct.Emitter.html b/docs-rs/bdk/nightly/latest/bdk_bitcoind_rpc/struct.Emitter.html index aec3eeb9e3..f18b7bc898 100644 --- a/docs-rs/bdk/nightly/latest/bdk_bitcoind_rpc/struct.Emitter.html +++ b/docs-rs/bdk/nightly/latest/bdk_bitcoind_rpc/struct.Emitter.html @@ -1,6 +1,6 @@ Emitter in bdk_bitcoind_rpc - Rust

    Struct bdk_bitcoind_rpc::Emitter

    source · 
    pub struct Emitter<'c, C> { /* private fields */ }
    Expand description

    The Emitter is used to emit data sourced from [bitcoincore_rpc::Client].

    Refer to module-level documentation for more.

    -

    Implementations§

    Construct a new Emitter.

    +

    Implementations§

    Construct a new Emitter.

    last_cp informs the emitter of the chain we are starting off with. This way, the emitter can start emission from a block that connects to the original chain.

    start_height starts emission from a given height (if there are no conflicts with the diff --git a/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/enum.ApplyHeaderError.html b/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/enum.ApplyHeaderError.html index ba0f2fb4ad..d9f3a5cfd7 100644 --- a/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/enum.ApplyHeaderError.html +++ b/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/enum.ApplyHeaderError.html @@ -1,12 +1,12 @@ -ApplyHeaderError in bdk_chain::local_chain - Rust

    Enum bdk_chain::local_chain::ApplyHeaderError

    source · 
    pub enum ApplyHeaderError {
+ApplyHeaderError in bdk_chain::local_chain - Rust
    Enum bdk_chain::local_chain::ApplyHeaderError
    source · 
    pub enum ApplyHeaderError {
     InconsistentBlocks,
     CannotConnect(CannotConnectError),
 }
    Expand description
    The error type for LocalChain::apply_header_connected_to.
    
 
    Variants§
    §
    InconsistentBlocks
    Occurs when connected_to block conflicts with either the current block or previous block.
    
 
    §
    CannotConnect(CannotConnectError)
    Occurs when the update cannot connect with the original chain.
    
-
    Trait Implementations§
    Returns a copy of the value. Read more
    Performs copy-assignment from source. Read more
    Formats the value using the given formatter. Read more
    Formats the value using the given formatter. Read more
    The lower-level source of this error, if any. Read more
    👎Deprecated since 1.42.0: use the Display impl or to_string()
     Read more
    👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting
    🔬This is a nightly-only experimental API. (error_generic_member_access)
    Provides type based access to context intended for error reports. Read more
    This method tests for self and other values to be equal, and is used
+
    Trait Implementations§
    Returns a copy of the value. Read more
    Performs copy-assignment from source. Read more
    Formats the value using the given formatter. Read more
    Formats the value using the given formatter. Read more
    The lower-level source of this error, if any. Read more
    👎Deprecated since 1.42.0: use the Display impl or to_string()
     Read more
    👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting
    🔬This is a nightly-only experimental API. (error_generic_member_access)
    Provides type based access to context intended for error reports. Read more
    This method tests for self and other values to be equal, and is used
 by ==. Read more
    This method tests for !=. The default implementation is almost always
-sufficient, and should not be overridden without very good reason. Read more
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Returns the argument unchanged.
    
+sufficient, and should not be overridden without very good reason. Read more
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Returns the argument unchanged.
    
 
    Calls U::from(self).
    
 
    That is, this conversion is whatever the implementation of
 From<T> for U chooses to do.
    
diff --git a/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/index.html b/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/index.html
index 81c845cf27..b273b85cd8 100644
--- a/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/index.html
+++ b/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/index.html
@@ -1,3 +1,3 @@
-bdk_chain::local_chain - Rust
    Module bdk_chain::local_chain
    source · 
    Expand description
    The LocalChain is a local implementation of ChainOracle.
    
+bdk_chain::local_chain - Rust
    Module bdk_chain::local_chain
    source · 
    Expand description
    The LocalChain is a local implementation of ChainOracle.
    
 
    Structs
    AlterCheckPointError
    Represents a failure when trying to insert/remove a checkpoint to/from LocalChain.
    CannotConnectError
    Occurs when an update does not have a common checkpoint with the original chain.
    CheckPoint
    A LocalChain checkpoint is used to find the agreement point between two chains and as a
 transaction anchor.
    CheckPointIter
    Iterates over checkpoints backwards.
    LocalChain
    This is a local implementation of ChainOracle.
    MissingGenesisError
    An error which occurs when a LocalChain is constructed without a genesis checkpoint.
    Update
    Used to update LocalChain.
    Enums
    ApplyHeaderError
    The error type for LocalChain::apply_header_connected_to.
    Type Definitions
    ChangeSet
    The ChangeSet represents changes to LocalChain.
    
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.AlterCheckPointError.html b/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.AlterCheckPointError.html
index ff22b0826f..69257566a7 100644
--- a/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.AlterCheckPointError.html
+++ b/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.AlterCheckPointError.html
@@ -1,4 +1,4 @@
-AlterCheckPointError in bdk_chain::local_chain - Rust
    Struct bdk_chain::local_chain::AlterCheckPointError
    source · 
    pub struct AlterCheckPointError {
+AlterCheckPointError in bdk_chain::local_chain - Rust
    Struct bdk_chain::local_chain::AlterCheckPointError
    source · 
    pub struct AlterCheckPointError {
     pub height: u32,
     pub original_hash: BlockHash,
     pub update_hash: Option<BlockHash>,
@@ -6,9 +6,9 @@
 
    Fields§
    §height: u32
    The checkpoint’s height.
    
 
    §original_hash: BlockHash
    The original checkpoint’s block hash which cannot be replaced/removed.
    
 
    §update_hash: Option<BlockHash>
    The attempted update to the original_block hash.
    
-
    Trait Implementations§
    Returns a copy of the value. Read more
    Performs copy-assignment from source. Read more
    Formats the value using the given formatter. Read more
    Formats the value using the given formatter. Read more
    The lower-level source of this error, if any. Read more
    👎Deprecated since 1.42.0: use the Display impl or to_string()
     Read more
    👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting
    🔬This is a nightly-only experimental API. (error_generic_member_access)
    Provides type based access to context intended for error reports. Read more
    This method tests for self and other values to be equal, and is used
+
    Trait Implementations§
    Returns a copy of the value. Read more
    Performs copy-assignment from source. Read more
    Formats the value using the given formatter. Read more
    Formats the value using the given formatter. Read more
    The lower-level source of this error, if any. Read more
    👎Deprecated since 1.42.0: use the Display impl or to_string()
     Read more
    👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting
    🔬This is a nightly-only experimental API. (error_generic_member_access)
    Provides type based access to context intended for error reports. Read more
    This method tests for self and other values to be equal, and is used
 by ==. Read more
    This method tests for !=. The default implementation is almost always
-sufficient, and should not be overridden without very good reason. Read more
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Returns the argument unchanged.
    
+sufficient, and should not be overridden without very good reason. Read more
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Returns the argument unchanged.
    
 
    Calls U::from(self).
    
 
    That is, this conversion is whatever the implementation of
 From<T> for U chooses to do.
    
diff --git a/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.CannotConnectError.html b/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.CannotConnectError.html
index e439620bd4..4e1c175b40 100644
--- a/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.CannotConnectError.html
+++ b/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.CannotConnectError.html
@@ -1,10 +1,10 @@
-CannotConnectError in bdk_chain::local_chain - Rust
    Struct bdk_chain::local_chain::CannotConnectError
    source · 
    pub struct CannotConnectError {
+CannotConnectError in bdk_chain::local_chain - Rust
    Struct bdk_chain::local_chain::CannotConnectError
    source · 
    pub struct CannotConnectError {
     pub try_include_height: u32,
 }
    Expand description
    Occurs when an update does not have a common checkpoint with the original chain.
    
 
    Fields§
    §try_include_height: u32
    The suggested checkpoint to include to connect the two chains.
    
-
    Trait Implementations§
    Returns a copy of the value. Read more
    Performs copy-assignment from source. Read more
    Formats the value using the given formatter. Read more
    Formats the value using the given formatter. Read more
    The lower-level source of this error, if any. Read more
    👎Deprecated since 1.42.0: use the Display impl or to_string()
     Read more
    👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting
    🔬This is a nightly-only experimental API. (error_generic_member_access)
    Provides type based access to context intended for error reports. Read more
    This method tests for self and other values to be equal, and is used
+
    Trait Implementations§
    Returns a copy of the value. Read more
    Performs copy-assignment from source. Read more
    Formats the value using the given formatter. Read more
    Formats the value using the given formatter. Read more
    The lower-level source of this error, if any. Read more
    👎Deprecated since 1.42.0: use the Display impl or to_string()
     Read more
    👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting
    🔬This is a nightly-only experimental API. (error_generic_member_access)
    Provides type based access to context intended for error reports. Read more
    This method tests for self and other values to be equal, and is used
 by ==. Read more
    This method tests for !=. The default implementation is almost always
-sufficient, and should not be overridden without very good reason. Read more
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Returns the argument unchanged.
    
+sufficient, and should not be overridden without very good reason. Read more
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Returns the argument unchanged.
    
 
    Calls U::from(self).
    
 
    That is, this conversion is whatever the implementation of
 From<T> for U chooses to do.
    
diff --git a/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.CheckPoint.html b/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.CheckPoint.html
index 63bb83b361..efeb9394c0 100644
--- a/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.CheckPoint.html
+++ b/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.CheckPoint.html
@@ -1,11 +1,11 @@
-CheckPoint in bdk_chain::local_chain - Rust
    Struct bdk_chain::local_chain::CheckPoint
    source · 
    pub struct CheckPoint(_);
    Expand description
    A LocalChain checkpoint is used to find the agreement point between two chains and as a
+CheckPoint in bdk_chain::local_chain - Rust
    Struct bdk_chain::local_chain::CheckPoint
    source · 
    pub struct CheckPoint(_);
    Expand description
    A LocalChain checkpoint is used to find the agreement point between two chains and as a
 transaction anchor.
    
 
    Each checkpoint contains the height and hash of a block (BlockId).
    
 
    Internally, checkpoints are nodes of a reference-counted linked-list. This allows the caller to
 cheaply clone a CheckPoint without copying the whole list and to view the entire chain
 without holding a lock on LocalChain.
    
-
    Implementations§
    Construct a new base block at the front of a linked list.
    
-
    Construct a checkpoint from a list of BlockIds in ascending height order.
    
+
    Implementations§
    Construct a new base block at the front of a linked list.
    
+
    Construct a checkpoint from a list of BlockIds in ascending height order.
    
 
    Errors
    
 
    This method will error if any of the follow occurs:
    
 
      
@@ -14,23 +14,30 @@ 
      Errors
      
 
    • The blocks iterator contains multiple BlockIds of the same height.
      • 
 
    
 
    The error type is the last successful checkpoint constructed (if any).
    
-
    Construct a checkpoint from the given header and block height.
    
+
    Construct a checkpoint from the given header and block height.
    
 
    If header is of the genesis block, the checkpoint won’t have a prev node. Otherwise,
 we return a checkpoint linked with the previous block.
    
-
    Convenience method to convert the CheckPoint into an Update.
    
+
    Convenience method to convert the CheckPoint into an Update.
    
 
    For more information, refer to Update.
    
-
    Puts another checkpoint onto the linked list representing the blockchain.
    
+
    Puts another checkpoint onto the linked list representing the blockchain.
    
 
    Returns an Err(self) if the block you are pushing on is not at a greater height that the one you
 are pushing on to.
    
-
    Extends the checkpoint linked list by a iterator of block ids.
    
+
    Extends the checkpoint linked list by a iterator of block ids.
    
 
    Returns an Err(self) if there is block which does not have a greater height than the
 previous one.
    
-
    Get the BlockId of the checkpoint.
    
-
    Get the height of the checkpoint.
    
-
    Get the block hash of the checkpoint.
    
-
    Get the previous checkpoint in the chain
    
-
    Iterate from this checkpoint in descending height.
    
-
    Trait Implementations§
    Returns a copy of the value. Read more
    Performs copy-assignment from source. Read more
    Formats the value using the given formatter. Read more
    The type of the elements being iterated over.
    Which kind of iterator are we turning this into?
    Creates an iterator from a value. Read more
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Returns the argument unchanged.
    
+
    Get the BlockId of the checkpoint.
    
+
    Get the height of the checkpoint.
    
+
    Get the block hash of the checkpoint.
    
+
    Get the previous checkpoint in the chain
    
+
    Iterate from this checkpoint in descending height.
    
+
    Get checkpoint at height.
    
+
    Returns None if checkpoint at height does not exist`.
    
+
    Iterate checkpoints over a height range.
    
+
    Note that we always iterate checkpoints in reverse height order (iteration starts at tip
+height).
    
+
    Trait Implementations§
    Returns a copy of the value. Read more
    Performs copy-assignment from source. Read more
    Formats the value using the given formatter. Read more
    The type of the elements being iterated over.
    Which kind of iterator are we turning this into?
    Creates an iterator from a value. Read more
    This method tests for self and other values to be equal, and is used
+by ==. Read more
    This method tests for !=. The default implementation is almost always
+sufficient, and should not be overridden without very good reason. Read more
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Returns the argument unchanged.
    
 
    Calls U::from(self).
    
 
    That is, this conversion is whatever the implementation of
 From<T> for U chooses to do.
    
diff --git a/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.CheckPointIter.html b/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.CheckPointIter.html
index e252f0d04b..f4ed7a0c10 100644
--- a/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.CheckPointIter.html
+++ b/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.CheckPointIter.html
@@ -1,5 +1,5 @@
-CheckPointIter in bdk_chain::local_chain - Rust
    Struct bdk_chain::local_chain::CheckPointIter
    source · 
    pub struct CheckPointIter { /* private fields */ }
    Expand description
    Iterates over checkpoints backwards.
    
-
    Trait Implementations§
    The type of the elements being iterated over.
    Advances the iterator and returns the next value. Read more
    🔬This is a nightly-only experimental API. (iter_next_chunk)
    Advances the iterator and returns an array containing the next N values. Read more
    Returns the bounds on the remaining length of the iterator. Read more
    Consumes the iterator, counting the number of iterations and returning it. Read more
    Consumes the iterator, returning the last element. Read more
    🔬This is a nightly-only experimental API. (iter_advance_by)
    Advances the iterator by n elements. Read more
    Returns the nth element of the iterator. Read more
    Creates an iterator starting at the same point, but stepping by
+CheckPointIter in bdk_chain::local_chain - Rust
    Struct bdk_chain::local_chain::CheckPointIter
    source · 
    pub struct CheckPointIter { /* private fields */ }
    Expand description
    Iterates over checkpoints backwards.
    
+
    Trait Implementations§
    The type of the elements being iterated over.
    Advances the iterator and returns the next value. Read more
    🔬This is a nightly-only experimental API. (iter_next_chunk)
    Advances the iterator and returns an array containing the next N values. Read more
    Returns the bounds on the remaining length of the iterator. Read more
    Consumes the iterator, counting the number of iterations and returning it. Read more
    Consumes the iterator, returning the last element. Read more
    🔬This is a nightly-only experimental API. (iter_advance_by)
    Advances the iterator by n elements. Read more
    Returns the nth element of the iterator. Read more
    Creates an iterator starting at the same point, but stepping by
 the given amount at each iteration. Read more
    Takes two iterators and creates a new iterator over both in sequence. Read more
    ‘Zips up’ two iterators into a single iterator of pairs. Read more
    🔬This is a nightly-only experimental API. (iter_intersperse)
    Creates a new iterator which places an item generated by separator
 between adjacent items of the original iterator. Read more
    Takes a closure and creates an iterator which calls that closure on each
 element. Read more
    Calls a closure on each element of an iterator. Read more
    Creates an iterator which uses a closure to determine if an element
diff --git a/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.LocalChain.html b/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.LocalChain.html
index 6af13fa016..fc0c7711d4 100644
--- a/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.LocalChain.html
+++ b/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.LocalChain.html
@@ -1,13 +1,13 @@
-LocalChain in bdk_chain::local_chain - Rust
    Struct bdk_chain::local_chain::LocalChain
    source · 
    pub struct LocalChain { /* private fields */ }
    Expand description
    This is a local implementation of ChainOracle.
    
-
    Implementations§
    Get the genesis hash.
    
-
    Construct LocalChain from genesis hash.
    
-
    Construct a LocalChain from an initial changeset.
    
-
    Construct a LocalChain from a given checkpoint tip.
    
-
    Constructs a LocalChain from a BTreeMap of height to [BlockHash].
    
+LocalChain in bdk_chain::local_chain - Rust
    Struct bdk_chain::local_chain::LocalChain
    source · 
    pub struct LocalChain { /* private fields */ }
    Expand description
    This is a local implementation of ChainOracle.
    
+
    Implementations§
    Get the genesis hash.
    
+
    Construct LocalChain from genesis hash.
    
+
    Construct a LocalChain from an initial changeset.
    
+
    Construct a LocalChain from a given checkpoint tip.
    
+
    Constructs a LocalChain from a BTreeMap of height to [BlockHash].
    
 
    The BTreeMap enforces the height order. However, the caller must ensure the blocks are
 all of the same chain.
    
-
    Get the highest checkpoint.
    
-
    Applies the given update to the chain.
    
+
    Get the highest checkpoint.
    
+
    Applies the given update to the chain.
    
 
    The method returns ChangeSet on success. This represents the applied changes to self.
    
 
    There must be no ambiguity about which of the existing chain’s blocks are still valid and
 which are now invalid. That is, the new chain must implicitly connect to a definite block in
@@ -19,7 +19,7 @@
 
    Errors
    
 
    An error will occur if the update does not correctly connect with self.
    
 
    Refer to Update for more about the update struct.
    
-
    Update the chain with a given [Header] at height which you claim is connected to a existing block in the chain.
    
+
    Update the chain with a given [Header] at height which you claim is connected to a existing block in the chain.
    
 
    This is useful when you have a block header that you want to record as part of the chain but
 don’t necessarily know that the prev_blockhash is in the chain.
    
 
    This will usually insert two new BlockIds into the chain: the header’s block and the
@@ -33,27 +33,32 @@ 
    Errors
    
 header or prev_blockhash, but has a different block hash. Or if the connected_to
 height is greater than the header’s height.
    
 
    ApplyHeaderError::CannotConnect occurs if the internal call to apply_update fails.
    
-
    Update the chain with a given [Header] connecting it with the previous block.
    
+
    Update the chain with a given [Header] connecting it with the previous block.
    
 
    This is a convenience method to call apply_header_connected_to with the connected_to
 parameter being height-1:prev_blockhash. If there is no previous block (i.e. genesis), we
 use the current block as connected_to.
    
-
    Apply the given changeset.
    
-
    Insert a BlockId.
    
+
    Apply the given changeset.
    
+
    Insert a BlockId.
    
 
    Errors
    
 
    Replacing the block hash of an existing checkpoint will result in an error.
    
-
    Removes blocks from (and inclusive of) the given block_id.
    
+
    Removes blocks from (and inclusive of) the given block_id.
    
 
    This will remove blocks with a height equal or greater than block_id, but only if
 block_id exists in the chain.
    
 
    Errors
    
 
    This will fail with MissingGenesisError if the caller attempts to disconnect from the
 genesis block.
    
-
    Derives an initial ChangeSet, meaning that it can be applied to an empty chain to
+
    Derives an initial ChangeSet, meaning that it can be applied to an empty chain to
 recover the current chain.
    
-
    Iterate over checkpoints in descending height order.
    
-
    Get a reference to the internal index mapping the height to block hash.
    
-
    Trait Implementations§
    Error type.
    Determines whether block of BlockId exists as an ancestor of chain_tip. Read more
    Get the best chain’s chain tip.
    Returns a copy of the value. Read more
    Performs copy-assignment from source. Read more
    Formats the value using the given formatter. Read more
    Converts to this type from the input type.
    This method tests for self and other values to be equal, and is used
+
    Iterate over checkpoints in descending height order.
    
+
    Get checkpoint at given height (if it exists).
    
+
    This is a shorthand for calling CheckPoint::get on the tip.
    
+
    Iterate checkpoints over a height range.
    
+
    Note that we always iterate checkpoints in reverse height order (iteration starts at tip
+height).
    
+
    This is a shorthand for calling CheckPoint::range on the tip.
    
+
    Trait Implementations§
    Error type.
    Determines whether block of BlockId exists as an ancestor of chain_tip. Read more
    Get the best chain’s chain tip.
    Returns a copy of the value. Read more
    Performs copy-assignment from source. Read more
    Formats the value using the given formatter. Read more
    This method tests for self and other values to be equal, and is used
 by ==. Read more
    This method tests for !=. The default implementation is almost always
-sufficient, and should not be overridden without very good reason. Read more
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Returns the argument unchanged.
    
+sufficient, and should not be overridden without very good reason. Read more
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Returns the argument unchanged.
    
 
    Calls U::from(self).
    
 
    That is, this conversion is whatever the implementation of
 From<T> for U chooses to do.
    
diff --git a/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.MissingGenesisError.html b/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.MissingGenesisError.html
index 87e86beaee..657f8f93ee 100644
--- a/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.MissingGenesisError.html
+++ b/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.MissingGenesisError.html
@@ -1,7 +1,7 @@
-MissingGenesisError in bdk_chain::local_chain - Rust
    Struct bdk_chain::local_chain::MissingGenesisError
    source · 
    pub struct MissingGenesisError;
    Expand description
    An error which occurs when a LocalChain is constructed without a genesis checkpoint.
    
-
    Trait Implementations§
    Returns a copy of the value. Read more
    Performs copy-assignment from source. Read more
    Formats the value using the given formatter. Read more
    Formats the value using the given formatter. Read more
    The lower-level source of this error, if any. Read more
    👎Deprecated since 1.42.0: use the Display impl or to_string()
     Read more
    👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting
    🔬This is a nightly-only experimental API. (error_generic_member_access)
    Provides type based access to context intended for error reports. Read more
    This method tests for self and other values to be equal, and is used
+MissingGenesisError in bdk_chain::local_chain - Rust
    Struct bdk_chain::local_chain::MissingGenesisError
    source · 
    pub struct MissingGenesisError;
    Expand description
    An error which occurs when a LocalChain is constructed without a genesis checkpoint.
    
+
    Trait Implementations§
    Returns a copy of the value. Read more
    Performs copy-assignment from source. Read more
    Formats the value using the given formatter. Read more
    Formats the value using the given formatter. Read more
    The lower-level source of this error, if any. Read more
    👎Deprecated since 1.42.0: use the Display impl or to_string()
     Read more
    👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting
    🔬This is a nightly-only experimental API. (error_generic_member_access)
    Provides type based access to context intended for error reports. Read more
    This method tests for self and other values to be equal, and is used
 by ==. Read more
    This method tests for !=. The default implementation is almost always
-sufficient, and should not be overridden without very good reason. Read more
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Returns the argument unchanged.
    
+sufficient, and should not be overridden without very good reason. Read more
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Returns the argument unchanged.
    
 
    Calls U::from(self).
    
 
    That is, this conversion is whatever the implementation of
 From<T> for U chooses to do.
    
diff --git a/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.Update.html b/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.Update.html
index f10e561688..d70cbea7a2 100644
--- a/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.Update.html
+++ b/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/struct.Update.html
@@ -1,4 +1,4 @@
-Update in bdk_chain::local_chain - Rust
    Struct bdk_chain::local_chain::Update
    source · 
    pub struct Update {
+Update in bdk_chain::local_chain - Rust
    Struct bdk_chain::local_chain::Update
    source · 
    pub struct Update {
     pub tip: CheckPoint,
     pub introduce_older_blocks: bool,
 }
    Expand description
    Used to update LocalChain.
    
@@ -13,7 +13,9 @@
 
    Fields§
    §tip: CheckPoint
    The update chain’s new tip.
    
 
    §introduce_older_blocks: bool
    Whether the update allows for introducing older blocks.
    
 
    Refer to struct-level documentation for more.
    
-
    Trait Implementations§
    Returns a copy of the value. Read more
    Performs copy-assignment from source. Read more
    Formats the value using the given formatter. Read more
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Returns the argument unchanged.
    
+
    Trait Implementations§
    Returns a copy of the value. Read more
    Performs copy-assignment from source. Read more
    Formats the value using the given formatter. Read more
    This method tests for self and other values to be equal, and is used
+by ==. Read more
    This method tests for !=. The default implementation is almost always
+sufficient, and should not be overridden without very good reason. Read more
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Returns the argument unchanged.
    
 
    Calls U::from(self).
    
 
    That is, this conversion is whatever the implementation of
 From<T> for U chooses to do.
    
diff --git a/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/type.ChangeSet.html b/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/type.ChangeSet.html
index 9bc9556b52..882486d6ae 100644
--- a/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/type.ChangeSet.html
+++ b/docs-rs/bdk/nightly/latest/bdk_chain/local_chain/type.ChangeSet.html
@@ -1,4 +1,4 @@
-ChangeSet in bdk_chain::local_chain - Rust
    Type Definition bdk_chain::local_chain::ChangeSet
    source · 
    pub type ChangeSet = BTreeMap<u32, Option<BlockHash>>;
    Expand description
    The ChangeSet represents changes to LocalChain.
    
+ChangeSet in bdk_chain::local_chain - Rust
    Type Definition bdk_chain::local_chain::ChangeSet
    source · 
    pub type ChangeSet = BTreeMap<u32, Option<BlockHash>>;
    Expand description
    The ChangeSet represents changes to LocalChain.
    
 
    The key represents the block height, and the value either represents added a new CheckPoint
 (if Some), or removing a CheckPoint (if None).
    
 
    
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/bdk_chain/trait.ChainOracle.html b/docs-rs/bdk/nightly/latest/bdk_chain/trait.ChainOracle.html
index 8c55434631..335b3c7a15 100644
--- a/docs-rs/bdk/nightly/latest/bdk_chain/trait.ChainOracle.html
+++ b/docs-rs/bdk/nightly/latest/bdk_chain/trait.ChainOracle.html
@@ -11,4 +11,4 @@
 
    If None is returned, it means the implementation cannot determine whether block exists
 under chain_tip.
    
 
    Get the best chain’s chain tip.
    
-
    Implementors§
    
\ No newline at end of file
+
    Implementors§
    
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/bdk_chain/tx_graph/struct.TxAncestors.html b/docs-rs/bdk/nightly/latest/bdk_chain/tx_graph/struct.TxAncestors.html
index 6b81fdd152..e1ebd2ecae 100644
--- a/docs-rs/bdk/nightly/latest/bdk_chain/tx_graph/struct.TxAncestors.html
+++ b/docs-rs/bdk/nightly/latest/bdk_chain/tx_graph/struct.TxAncestors.html
@@ -33,8 +33,8 @@
 less or equal to those of another. Read more
    Determines if the elements of this Iterator are lexicographically
 greater than those of another. Read more
    Determines if the elements of this Iterator are lexicographically
 greater than or equal to those of another. Read more
    🔬This is a nightly-only experimental API. (is_sorted)
    Checks if the elements of this iterator are sorted using the given comparator function. Read more
    🔬This is a nightly-only experimental API. (is_sorted)
    Checks if the elements of this iterator are sorted using the given key extraction
-function. Read more
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Calculate the sum over the iterator using checked arithmetic. If an over or underflow would
-happen it returns None. Read more
    Calculate the sum over the iterator using checked arithmetic. If an over or underflow would
+function. Read more
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Calculate the sum over the iterator using checked arithmetic. If an over or underflow would
+happen it returns None. Read more
    Calculate the sum over the iterator using checked arithmetic. If an over or underflow would
 happen it returns None. Read more
    Returns the argument unchanged.
    
 
    Calls U::from(self).
    
 
    That is, this conversion is whatever the implementation of
diff --git a/docs-rs/bdk/nightly/latest/bdk_chain/tx_graph/struct.TxDescendants.html b/docs-rs/bdk/nightly/latest/bdk_chain/tx_graph/struct.TxDescendants.html
index 8a8677029c..6f4716d2e4 100644
--- a/docs-rs/bdk/nightly/latest/bdk_chain/tx_graph/struct.TxDescendants.html
+++ b/docs-rs/bdk/nightly/latest/bdk_chain/tx_graph/struct.TxDescendants.html
@@ -32,8 +32,8 @@
 less or equal to those of another. Read more
    Determines if the elements of this Iterator are lexicographically
 greater than those of another. Read more
    Determines if the elements of this Iterator are lexicographically
 greater than or equal to those of another. Read more
    🔬This is a nightly-only experimental API. (is_sorted)
    Checks if the elements of this iterator are sorted using the given comparator function. Read more
    🔬This is a nightly-only experimental API. (is_sorted)
    Checks if the elements of this iterator are sorted using the given key extraction
-function. Read more
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Calculate the sum over the iterator using checked arithmetic. If an over or underflow would
-happen it returns None. Read more
    Calculate the sum over the iterator using checked arithmetic. If an over or underflow would
+function. Read more
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Calculate the sum over the iterator using checked arithmetic. If an over or underflow would
+happen it returns None. Read more
    Calculate the sum over the iterator using checked arithmetic. If an over or underflow would
 happen it returns None. Read more
    Returns the argument unchanged.
    
 
    Calls U::from(self).
    
 
    That is, this conversion is whatever the implementation of
diff --git a/docs-rs/bdk/nightly/latest/bdk_electrum/index.html b/docs-rs/bdk/nightly/latest/bdk_electrum/index.html
index f6b3ae8838..e8ac7f8a71 100644
--- a/docs-rs/bdk/nightly/latest/bdk_electrum/index.html
+++ b/docs-rs/bdk/nightly/latest/bdk_electrum/index.html
@@ -1,4 +1,4 @@
-bdk_electrum - Rust
    Crate bdk_electrum
    source · 
    Expand description
    This crate is used for updating structures of bdk_chain with data from an Electrum server.
    
+bdk_electrum - Rust
    Crate bdk_electrum
    source · 
    Expand description
    This crate is used for updating structures of [bdk_chain] with data from an Electrum server.
    
 
    The two primary methods are ElectrumExt::sync and ElectrumExt::full_scan. In most cases
 ElectrumExt::sync is used to sync the transaction histories of scripts that the application
 cares about, for example the scripts for all the receive addresses of a Wallet’s keychain that it
@@ -6,9 +6,9 @@
 keychain where the range of possibly used scripts is not known. In this case it is necessary to
 scan all keychain scripts until a number (the “stop gap”) of unused scripts is discovered. For a
 sync or full scan the user receives relevant blockchain data and output updates for
-bdk_chain including RelevantTxids.
    
+[bdk_chain] including RelevantTxids.
    
 
    The RelevantTxids only includes txids and not full transactions. The caller is responsible
-for obtaining full transactions before applying new data to their bdk_chain. This can be
+for obtaining full transactions before applying new data to their [bdk_chain]. This can be
 done with these steps:
    
 
      
 
    1. 
@@ -19,4 +19,4 @@
 
      2. 
 
    
 
    Refer to example_electrum for a complete example.
    
-
    Re-exports
    pub use bdk_chain;
    pub use electrum_client;
    Structs
    ElectrumUpdate
    Combination of chain and transactions updates from electrum
    RelevantTxids
    Represents updates fetched from an Electrum server, but excludes full transactions.
    Traits
    ElectrumExt
    Trait to extend [Client] functionality.
    
\ No newline at end of file
+
    Re-exports
    pub use bdk_chain;
    pub use electrum_client;
    Structs
    ElectrumUpdate
    Combination of chain and transactions updates from electrum
    RelevantTxids
    Represents updates fetched from an Electrum server, but excludes full transactions.
    Traits
    ElectrumExt
    Trait to extend [Client] functionality.
    
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/bdk_electrum/struct.ElectrumUpdate.html b/docs-rs/bdk/nightly/latest/bdk_electrum/struct.ElectrumUpdate.html
index 3386e7df31..699faa61c7 100644
--- a/docs-rs/bdk/nightly/latest/bdk_electrum/struct.ElectrumUpdate.html
+++ b/docs-rs/bdk/nightly/latest/bdk_electrum/struct.ElectrumUpdate.html
@@ -1,10 +1,10 @@
 ElectrumUpdate in bdk_electrum - Rust
    Struct bdk_electrum::ElectrumUpdate
    source · 
    pub struct ElectrumUpdate {
-    pub chain_update: Update,
+    pub chain_update: Update,
     pub relevant_txids: RelevantTxids,
 }
    Expand description
    Combination of chain and transactions updates from electrum
    
 
    We have to update the chain and the txids at the same time since we anchor the txids to
 the same chain tip that we check before and after we gather the txids.
    
-
    Fields§
    §chain_update: Update
    Chain update
    
+
    Fields§
    §chain_update: Update
    Chain update
    
 
    §relevant_txids: RelevantTxids
    Transaction updates from electrum
    
 
    Trait Implementations§
    Formats the value using the given formatter. Read more
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Returns the argument unchanged.
    
 
    Calls U::from(self).
    
diff --git a/docs-rs/bdk/nightly/latest/bdk_electrum/struct.RelevantTxids.html b/docs-rs/bdk/nightly/latest/bdk_electrum/struct.RelevantTxids.html
index a4af559487..2a64e2fb96 100644
--- a/docs-rs/bdk/nightly/latest/bdk_electrum/struct.RelevantTxids.html
+++ b/docs-rs/bdk/nightly/latest/bdk_electrum/struct.RelevantTxids.html
@@ -1,13 +1,13 @@
 RelevantTxids in bdk_electrum - Rust
    Struct bdk_electrum::RelevantTxids
    source · 
    pub struct RelevantTxids(_);
    Expand description
    Represents updates fetched from an Electrum server, but excludes full transactions.
    
-
    To provide a complete update to TxGraph, you’ll need to call Self::missing_full_txs to
-determine the full transactions missing from TxGraph. Then call Self::into_tx_graph to
+
    To provide a complete update to [TxGraph], you’ll need to call Self::missing_full_txs to
+determine the full transactions missing from [TxGraph]. Then call Self::into_tx_graph to
 fetch the full transactions from Electrum and finalize the update.
    
-
    Implementations§
    Determine the full transactions that are missing from graph.
    
+
    Implementations§
    Determine the full transactions that are missing from graph.
    
 
    Refer to RelevantTxids for more details.
    
-
    Finalizes the TxGraph update by fetching missing txids from the client.
    
+
    Finalizes the [TxGraph] update by fetching missing txids from the client.
    
 
    Refer to RelevantTxids for more details.
    
-
    Finalizes the update by fetching missing txids from the client, where the
-resulting TxGraph has anchors of type ConfirmationTimeHeightAnchor.
    
+
    Finalizes the update by fetching missing txids from the client, where the
+resulting [TxGraph] has anchors of type [ConfirmationTimeHeightAnchor].
    
 
    Refer to RelevantTxids for more details.
    
 
    Note: The confirmation time might not be precisely correct if there has been a reorg.
    
 
    Trait Implementations§
    Returns a copy of the value. Read more
    Performs copy-assignment from source. Read more
    Formats the value using the given formatter. Read more
    Returns the “default value” for a type. Read more
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Returns the argument unchanged.
    
diff --git a/docs-rs/bdk/nightly/latest/bdk_electrum/trait.ElectrumExt.html b/docs-rs/bdk/nightly/latest/bdk_electrum/trait.ElectrumExt.html
index 81664b4c74..ffef158df9 100644
--- a/docs-rs/bdk/nightly/latest/bdk_electrum/trait.ElectrumExt.html
+++ b/docs-rs/bdk/nightly/latest/bdk_electrum/trait.ElectrumExt.html
@@ -1,9 +1,9 @@
 ElectrumExt in bdk_electrum - Rust
    Trait bdk_electrum::ElectrumExt
    source · 
    pub trait ElectrumExt {
-    fn full_scan<K: Ord + Clone>(
            &self,
            prev_tip: CheckPoint,
            keychain_spks: BTreeMap<K, impl IntoIterator<Item = (u32, ScriptBuf)>>,
            stop_gap: usize,
            batch_size: usize
        ) -> Result<(ElectrumUpdate, BTreeMap<K, u32>), Error>;
-    fn sync(
            &self,
            prev_tip: CheckPoint,
            misc_spks: impl IntoIterator<Item = ScriptBuf>,
            txids: impl IntoIterator<Item = Txid>,
            outpoints: impl IntoIterator<Item = OutPoint>,
            batch_size: usize
        ) -> Result<ElectrumUpdate, Error>;
+    fn full_scan<K: Ord + Clone>(
            &self,
            prev_tip: CheckPoint,
            keychain_spks: BTreeMap<K, impl IntoIterator<Item = (u32, ScriptBuf)>>,
            stop_gap: usize,
            batch_size: usize
        ) -> Result<(ElectrumUpdate, BTreeMap<K, u32>), Error>;
+    fn sync(
            &self,
            prev_tip: CheckPoint,
            misc_spks: impl IntoIterator<Item = ScriptBuf>,
            txids: impl IntoIterator<Item = Txid>,
            outpoints: impl IntoIterator<Item = OutPoint>,
            batch_size: usize
        ) -> Result<ElectrumUpdate, Error>;
 }
    Expand description
    Trait to extend [Client] functionality.
    
-
    Required Methods§
    Full scan the keychain scripts specified with the blockchain (via an Electrum client) and
-returns updates for bdk_chain data structures.
    
+
    Required Methods§
    Full scan the keychain scripts specified with the blockchain (via an Electrum client) and
+returns updates for [bdk_chain] data structures.
    
 
      
 
    • prev_tip: the most recent blockchain tip present locally
      • 
 
    • keychain_spks: keychains that we want to scan transactions for
      • 
@@ -11,12 +11,12 @@
 
      The full scan for each keychain stops after a gap of stop_gap script pubkeys with no associated
 transactions. batch_size specifies the max number of script pubkeys to request for in a
 single batch request.
      
-
    Sync a set of scripts with the blockchain (via an Electrum client) for the data specified
-and returns updates for bdk_chain data structures.
    
+
    Sync a set of scripts with the blockchain (via an Electrum client) for the data specified
+and returns updates for [bdk_chain] data structures.
    
 
      
 
    • prev_tip: the most recent blockchain tip present locally
      • 
 
    • misc_spks: an iterator of scripts we want to sync transactions for
      • 
-
    • txids: transactions for which we want updated Anchors
      • 
+
    • txids: transactions for which we want updated [Anchor]s
      • 
 
    • outpoints: transactions associated with these outpoints (residing, spending) that we
 want to include in the update
      • 
 
    
diff --git a/docs-rs/bdk/nightly/latest/bdk_esplora/index.html b/docs-rs/bdk/nightly/latest/bdk_esplora/index.html
index 47b4c8d0cf..e0b91720eb 100644
--- a/docs-rs/bdk/nightly/latest/bdk_esplora/index.html
+++ b/docs-rs/bdk/nightly/latest/bdk_esplora/index.html
@@ -27,6 +27,6 @@ 
    Usage
    
 keychain where the range of possibly used scripts is not known. In this case it is necessary to
 scan all keychain scripts until a number (the “stop gap”) of unused scripts is discovered. For a
 sync or full scan the user receives relevant blockchain data and output updates for bdk_chain
-via a new TxGraph to be appended to any existing TxGraph data.
    
+via a new TxGraph to be appended to any existing TxGraph data.
    
 
    Refer to example_esplora for a complete example.
    
 
    Re-exports
    pub use esplora_client;
    Traits
    EsploraAsyncExt
    Trait to extend the functionality of [esplora_client::AsyncClient].
    EsploraExt
    Trait to extend the functionality of [esplora_client::BlockingClient].
    
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/bdk_esplora/trait.EsploraAsyncExt.html b/docs-rs/bdk/nightly/latest/bdk_esplora/trait.EsploraAsyncExt.html
index ccb70a88b3..711cfef08a 100644
--- a/docs-rs/bdk/nightly/latest/bdk_esplora/trait.EsploraAsyncExt.html
+++ b/docs-rs/bdk/nightly/latest/bdk_esplora/trait.EsploraAsyncExt.html
@@ -1,21 +1,21 @@
 EsploraAsyncExt in bdk_esplora - Rust
    Trait bdk_esplora::EsploraAsyncExt
    source · 
    pub trait EsploraAsyncExt {
-    fn update_local_chain<'life0, 'async_trait>(
            &'life0 self,
            local_tip: CheckPoint,
            request_heights: impl 'async_trait + IntoIterator<IntoIter = impl 'async_trait + Iterator<Item = u32> + Send> + Send
        ) -> Pin<Box<dyn Future<Output = Result<Update, Box<Error>>> + Send + 'async_trait>>
        where
            Self: 'async_trait,
            'life0: 'async_trait    ;
-    fn full_scan<'life0, 'async_trait, K>(
            &'life0 self,
            keychain_spks: BTreeMap<K, impl 'async_trait + IntoIterator<IntoIter = impl 'async_trait + Iterator<Item = (u32, ScriptBuf)> + Send> + Send>,
            stop_gap: usize,
            parallel_requests: usize
        ) -> Pin<Box<dyn Future<Output = Result<(TxGraph<ConfirmationTimeHeightAnchor>, BTreeMap<K, u32>), Box<Error>>> + Send + 'async_trait>>
        where
            K: 'async_trait + Ord + Clone + Send,
            Self: 'async_trait,
            'life0: 'async_trait    ;
-    fn sync<'life0, 'async_trait>(
            &'life0 self,
            misc_spks: impl 'async_trait + IntoIterator<IntoIter = impl 'async_trait + Iterator<Item = ScriptBuf> + Send> + Send,
            txids: impl 'async_trait + IntoIterator<IntoIter = impl 'async_trait + Iterator<Item = Txid> + Send> + Send,
            outpoints: impl 'async_trait + IntoIterator<IntoIter = impl 'async_trait + Iterator<Item = OutPoint> + Send> + Send,
            parallel_requests: usize
        ) -> Pin<Box<dyn Future<Output = Result<TxGraph<ConfirmationTimeHeightAnchor>, Box<Error>>> + Send + 'async_trait>>
        where
            Self: 'async_trait,
            'life0: 'async_trait    ;
+    fn update_local_chain<'life0, 'async_trait>(
            &'life0 self,
            local_tip: CheckPoint,
            request_heights: impl 'async_trait + IntoIterator<IntoIter = impl 'async_trait + Iterator<Item = u32> + Send> + Send
        ) -> Pin<Box<dyn Future<Output = Result<Update, Box<Error>>> + Send + 'async_trait>>
        where
            Self: 'async_trait,
            'life0: 'async_trait    ;
+    fn full_scan<'life0, 'async_trait, K>(
            &'life0 self,
            keychain_spks: BTreeMap<K, impl 'async_trait + IntoIterator<IntoIter = impl 'async_trait + Iterator<Item = (u32, ScriptBuf)> + Send> + Send>,
            stop_gap: usize,
            parallel_requests: usize
        ) -> Pin<Box<dyn Future<Output = Result<(TxGraph<ConfirmationTimeHeightAnchor>, BTreeMap<K, u32>), Box<Error>>> + Send + 'async_trait>>
        where
            K: 'async_trait + Ord + Clone + Send,
            Self: 'async_trait,
            'life0: 'async_trait    ;
+    fn sync<'life0, 'async_trait>(
            &'life0 self,
            misc_spks: impl 'async_trait + IntoIterator<IntoIter = impl 'async_trait + Iterator<Item = ScriptBuf> + Send> + Send,
            txids: impl 'async_trait + IntoIterator<IntoIter = impl 'async_trait + Iterator<Item = Txid> + Send> + Send,
            outpoints: impl 'async_trait + IntoIterator<IntoIter = impl 'async_trait + Iterator<Item = OutPoint> + Send> + Send,
            parallel_requests: usize
        ) -> Pin<Box<dyn Future<Output = Result<TxGraph<ConfirmationTimeHeightAnchor>, Box<Error>>> + Send + 'async_trait>>
        where
            Self: 'async_trait,
            'life0: 'async_trait    ;
 }
    Expand description
    Trait to extend the functionality of [esplora_client::AsyncClient].
    
 
    Refer to crate-level documentation for more.
    
-
    Required Methods§
    Prepare a LocalChain update with blocks fetched from Esplora.
    
+
    Required Methods§
    Prepare a LocalChain update with blocks fetched from Esplora.
    
 
      
-
    • local_tip is the previous tip of LocalChain::tip.
      • 
+
    • local_tip is the previous tip of LocalChain::tip.
      • 
 
    • request_heights is the block heights that we are interested in fetching from Esplora.
      • 
 
    
-
    The result of this method can be applied to LocalChain::apply_update.
    
+
    The result of this method can be applied to LocalChain::apply_update.
    
 
    Consistency
    
 
    The chain update returned is guaranteed to be consistent as long as there is not a large re-org
 during the call. The size of re-org we can tollerate is server dependent but will be at
 least 10.
    
-
    Full scan the keychain scripts specified with the blockchain (via an Esplora client) and
-returns a TxGraph and a map of last active indices.
    
+
    Full scan the keychain scripts specified with the blockchain (via an Esplora client) and
+returns a [TxGraph] and a map of last active indices.
    
 
      
 
    • keychain_spks: keychains that we want to scan transactions for
      • 
 
    
@@ -31,14 +31,14 @@ 
    Note
    
 BTCPay Server,
 and Sparrow.
    
 
    A stop_gap of 0 will be treated as a stop_gap of 1.
    
-
    Sync a set of scripts with the blockchain (via an Esplora client) for the data
-specified and return a TxGraph.
    
+
    Sync a set of scripts with the blockchain (via an Esplora client) for the data
+specified and return a [TxGraph].
    
 
      
 
    • misc_spks: scripts that we want to sync transactions for
      • 
-
    • txids: transactions for which we want updated ConfirmationTimeHeightAnchors
      • 
+
    • txids: transactions for which we want updated [ConfirmationTimeHeightAnchor]s
      • 
 
    • outpoints: transactions associated with these outpoints (residing, spending) that we
 want to include in the update
      • 
 
    
 
    If the scripts to sync are unknown, such as when restoring or importing a keychain that
 may include scripts that have been used, use full_scan with the keychain.
    
-
    Implementations on Foreign Types§
    Implementors§
    
\ No newline at end of file
+
    Implementations on Foreign Types§
    Implementors§
    
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/bdk_esplora/trait.EsploraExt.html b/docs-rs/bdk/nightly/latest/bdk_esplora/trait.EsploraExt.html
index 06b1a74bb6..b0aaf8513e 100644
--- a/docs-rs/bdk/nightly/latest/bdk_esplora/trait.EsploraExt.html
+++ b/docs-rs/bdk/nightly/latest/bdk_esplora/trait.EsploraExt.html
@@ -1,21 +1,21 @@
 EsploraExt in bdk_esplora - Rust
    Trait bdk_esplora::EsploraExt
    source · 
    pub trait EsploraExt {
-    fn update_local_chain(
            &self,
            local_tip: CheckPoint,
            request_heights: impl IntoIterator<Item = u32>
        ) -> Result<Update, Box<Error>>;
-    fn full_scan<K: Ord + Clone>(
            &self,
            keychain_spks: BTreeMap<K, impl IntoIterator<Item = (u32, ScriptBuf)>>,
            stop_gap: usize,
            parallel_requests: usize
        ) -> Result<(TxGraph<ConfirmationTimeHeightAnchor>, BTreeMap<K, u32>), Box<Error>>;
-    fn sync(
            &self,
            misc_spks: impl IntoIterator<Item = ScriptBuf>,
            txids: impl IntoIterator<Item = Txid>,
            outpoints: impl IntoIterator<Item = OutPoint>,
            parallel_requests: usize
        ) -> Result<TxGraph<ConfirmationTimeHeightAnchor>, Box<Error>>;
+    fn update_local_chain(
            &self,
            local_tip: CheckPoint,
            request_heights: impl IntoIterator<Item = u32>
        ) -> Result<Update, Box<Error>>;
+    fn full_scan<K: Ord + Clone>(
            &self,
            keychain_spks: BTreeMap<K, impl IntoIterator<Item = (u32, ScriptBuf)>>,
            stop_gap: usize,
            parallel_requests: usize
        ) -> Result<(TxGraph<ConfirmationTimeHeightAnchor>, BTreeMap<K, u32>), Box<Error>>;
+    fn sync(
            &self,
            misc_spks: impl IntoIterator<Item = ScriptBuf>,
            txids: impl IntoIterator<Item = Txid>,
            outpoints: impl IntoIterator<Item = OutPoint>,
            parallel_requests: usize
        ) -> Result<TxGraph<ConfirmationTimeHeightAnchor>, Box<Error>>;
 }
    Expand description
    Trait to extend the functionality of [esplora_client::BlockingClient].
    
 
    Refer to crate-level documentation for more.
    
-
    Required Methods§
    Prepare a LocalChain update with blocks fetched from Esplora.
    
+
    Required Methods§
    Prepare a LocalChain update with blocks fetched from Esplora.
    
 
      
-
    • local_tip is the previous tip of LocalChain::tip.
      • 
+
    • local_tip is the previous tip of LocalChain::tip.
      • 
 
    • request_heights is the block heights that we are interested in fetching from Esplora.
      • 
 
    
-
    The result of this method can be applied to LocalChain::apply_update.
    
+
    The result of this method can be applied to LocalChain::apply_update.
    
 
    Consistency
    
 
    The chain update returned is guaranteed to be consistent as long as there is not a large re-org
 during the call. The size of re-org we can tollerate is server dependent but will be at
 least 10.
    
-
    Full scan the keychain scripts specified with the blockchain (via an Esplora client) and
-returns a TxGraph and a map of last active indices.
    
+
    Full scan the keychain scripts specified with the blockchain (via an Esplora client) and
+returns a [TxGraph] and a map of last active indices.
    
 
      
 
    • keychain_spks: keychains that we want to scan transactions for
      • 
 
    
@@ -31,14 +31,14 @@ 
    Note
    
 BTCPay Server,
 and Sparrow.
    
 
    A stop_gap of 0 will be treated as a stop_gap of 1.
    
-
    Sync a set of scripts with the blockchain (via an Esplora client) for the data
-specified and return a TxGraph.
    
+
    Sync a set of scripts with the blockchain (via an Esplora client) for the data
+specified and return a [TxGraph].
    
 
      
 
    • misc_spks: scripts that we want to sync transactions for
      • 
-
    • txids: transactions for which we want updated ConfirmationTimeHeightAnchors
      • 
+
    • txids: transactions for which we want updated [ConfirmationTimeHeightAnchor]s
      • 
 
    • outpoints: transactions associated with these outpoints (residing, spending) that we
 want to include in the update
      • 
 
    
 
    If the scripts to sync are unknown, such as when restoring or importing a keychain that
 may include scripts that have been used, use full_scan with the keychain.
    
-
    Implementations on Foreign Types§
    Implementors§
    
\ No newline at end of file
+
    Implementations on Foreign Types§
    Implementors§
    
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/bdk_file_store/index.html b/docs-rs/bdk/nightly/latest/bdk_file_store/index.html
index bcbc3630de..2858606387 100644
--- a/docs-rs/bdk/nightly/latest/bdk_file_store/index.html
+++ b/docs-rs/bdk/nightly/latest/bdk_file_store/index.html
@@ -1,6 +1,6 @@
 bdk_file_store - Rust
    Crate bdk_file_store
    source · 
    Expand description
    BDK File Store
    
 
    This is a simple append-only flat file implementation of
-Persist.
    
+Persist.
    
 
    The main structure is Store, which can be used with bdk’s
 Wallet to persist wallet data into a flat file.
    
 
    Structs
    AggregateChangesetsError
    Error type for Store::aggregate_changesets.
    EntryIter
    Iterator over entries in a file store.
    Store
    Persists an append-only list of changesets (C) to a single file.
    Enums
    FileError
    Error that occurs due to problems encountered with the file.
    IterError
    Error type for EntryIter.
    
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/bdk_file_store/struct.Store.html b/docs-rs/bdk/nightly/latest/bdk_file_store/struct.Store.html
index 2e664f3be5..5199b27a9e 100644
--- a/docs-rs/bdk/nightly/latest/bdk_file_store/struct.Store.html
+++ b/docs-rs/bdk/nightly/latest/bdk_file_store/struct.Store.html
@@ -1,6 +1,6 @@
 Store in bdk_file_store - Rust
    Struct bdk_file_store::Store
    source · 
    pub struct Store<C> { /* private fields */ }
    Expand description
    Persists an append-only list of changesets (C) to a single file.
    
 
    The changesets are the results of altering a tracker implementation (T).
    
-
    Implementations§
    Create a new Store file in write-only mode; error if the file exists.
    
+
    Implementations§
    Create a new Store file in write-only mode; error if the file exists.
    
 
    magic is the prefixed bytes to write to the new file. This will be checked when opening
 the Store in the future with open.
    
 
    Open an existing Store.
    
@@ -30,7 +30,7 @@ 
    Errors
    
 changeset.
    
 
    The truncation is to avoid the possibility of having a valid but inconsistent changeset
 directly after the appended changeset.
    
-
    Trait Implementations§
    Formats the value using the given formatter. Read more
    The error the backend returns when it fails to write.
    The error the backend returns when it fails to load changesets C.
    Writes a changeset to the persistence backend. Read more
    Return the aggregate changeset C from persistence.
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Returns the argument unchanged.
    
+
    Trait Implementations§
    Formats the value using the given formatter. Read more
    The error the backend returns when it fails to write.
    The error the backend returns when it fails to load changesets C.
    Writes a changeset to the persistence backend. Read more
    Return the aggregate changeset C from persistence.
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Returns the argument unchanged.
    
 
    Calls U::from(self).
    
 
    That is, this conversion is whatever the implementation of
 From<T> for U chooses to do.
    
diff --git a/docs-rs/bdk/nightly/latest/example_bitcoind_rpc_polling/type.ChangeSet.html b/docs-rs/bdk/nightly/latest/example_bitcoind_rpc_polling/type.ChangeSet.html
index c650b3daca..74f57a74be 100644
--- a/docs-rs/bdk/nightly/latest/example_bitcoind_rpc_polling/type.ChangeSet.html
+++ b/docs-rs/bdk/nightly/latest/example_bitcoind_rpc_polling/type.ChangeSet.html
@@ -1 +1 @@
-ChangeSet in example_bitcoind_rpc_polling - Rust
    Type Definition example_bitcoind_rpc_polling::ChangeSet
    source · 
    pub(crate) type ChangeSet = (ChangeSet, ChangeSet<ConfirmationTimeHeightAnchor, ChangeSet<Keychain>>);
    
\ No newline at end of file
+ChangeSet in example_bitcoind_rpc_polling - Rust
    Type Definition example_bitcoind_rpc_polling::ChangeSet
    source · 
    pub(crate) type ChangeSet = (ChangeSet, ChangeSet<ConfirmationTimeHeightAnchor, ChangeSet<Keychain>>);
    
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/example_cli/fn.create_tx.html b/docs-rs/bdk/nightly/latest/example_cli/fn.create_tx.html
index d58b3ddb38..2b8e8dd2d7 100644
--- a/docs-rs/bdk/nightly/latest/example_cli/fn.create_tx.html
+++ b/docs-rs/bdk/nightly/latest/example_cli/fn.create_tx.html
@@ -1 +1 @@
-create_tx in example_cli - Rust
    Function example_cli::create_tx
    source · 
    pub fn create_tx<A: Anchor, O: ChainOracle>(
        graph: &mut KeychainTxGraph<A>,
        chain: &O,
        keymap: &HashMap<DescriptorPublicKey, DescriptorSecretKey>,
        cs_algorithm: CoinSelectionAlgo,
        address: Address,
        value: u64
    ) -> Result<(Transaction, Option<CreateTxChange>)>where
        O::Error: Error + Send + Sync + 'static,
    
\ No newline at end of file
+create_tx in example_cli - Rust
    Function example_cli::create_tx
    source · 
    pub fn create_tx<A: Anchor, O: ChainOracle>(
        graph: &mut KeychainTxGraph<A>,
        chain: &O,
        keymap: &HashMap<DescriptorPublicKey, DescriptorSecretKey>,
        cs_algorithm: CoinSelectionAlgo,
        address: Address,
        value: u64
    ) -> Result<(Transaction, Option<CreateTxChange>)>where
        O::Error: Error + Send + Sync + 'static,
    
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/example_cli/fn.handle_commands.html b/docs-rs/bdk/nightly/latest/example_cli/fn.handle_commands.html
index c96ed73f09..7f912bf468 100644
--- a/docs-rs/bdk/nightly/latest/example_cli/fn.handle_commands.html
+++ b/docs-rs/bdk/nightly/latest/example_cli/fn.handle_commands.html
@@ -1 +1 @@
-handle_commands in example_cli - Rust
    Function example_cli::handle_commands
    source · 
    pub fn handle_commands<CS: Subcommand, S: Args, A: Anchor, O: ChainOracle, C>(
        graph: &Mutex<KeychainTxGraph<A>>,
        db: &Mutex<Database<C>>,
        chain: &Mutex<O>,
        keymap: &HashMap<DescriptorPublicKey, DescriptorSecretKey>,
        network: Network,
        broadcast: impl FnOnce(S, &Transaction) -> Result<()>,
        cmd: Commands<CS, S>
    ) -> Result<()>where
        O::Error: Error + Send + Sync + 'static,
        C: Default + Append + DeserializeOwned + Serialize + From<KeychainChangeSet<A>>,
    
\ No newline at end of file
+handle_commands in example_cli - Rust
    Function example_cli::handle_commands
    source · 
    pub fn handle_commands<CS: Subcommand, S: Args, A: Anchor, O: ChainOracle, C>(
        graph: &Mutex<KeychainTxGraph<A>>,
        db: &Mutex<Database<C>>,
        chain: &Mutex<O>,
        keymap: &HashMap<DescriptorPublicKey, DescriptorSecretKey>,
        network: Network,
        broadcast: impl FnOnce(S, &Transaction) -> Result<()>,
        cmd: Commands<CS, S>
    ) -> Result<()>where
        O::Error: Error + Send + Sync + 'static,
        C: Default + Append + DeserializeOwned + Serialize + From<KeychainChangeSet<A>>,
    
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/example_cli/fn.init.html b/docs-rs/bdk/nightly/latest/example_cli/fn.init.html
index 7984d0e0d9..d55ae72ec0 100644
--- a/docs-rs/bdk/nightly/latest/example_cli/fn.init.html
+++ b/docs-rs/bdk/nightly/latest/example_cli/fn.init.html
@@ -1,3 +1,3 @@
-init in example_cli - Rust
    Function example_cli::init
    source · 
    pub fn init<CS: Subcommand, S: Args, C>(
        db_magic: &[u8],
        db_default_path: &str
    ) -> Result<Init<CS, S, C>>where
        C: Default + Append + Serialize + DeserializeOwned,
    Expand description
    Parses command line arguments and initializes all components, creating
+init in example_cli - Rust
    Function example_cli::init
    source · 
    pub fn init<CS: Subcommand, S: Args, C>(
        db_magic: &[u8],
        db_default_path: &str
    ) -> Result<Init<CS, S, C>>where
        C: Default + Append + Serialize + DeserializeOwned,
    Expand description
    Parses command line arguments and initializes all components, creating
 a file store with the given parameters, or loading one if it exists.
    
 
    
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/example_cli/fn.planned_utxos.html b/docs-rs/bdk/nightly/latest/example_cli/fn.planned_utxos.html
index e6f5737f07..9afcc2756b 100644
--- a/docs-rs/bdk/nightly/latest/example_cli/fn.planned_utxos.html
+++ b/docs-rs/bdk/nightly/latest/example_cli/fn.planned_utxos.html
@@ -1 +1 @@
-planned_utxos in example_cli - Rust
    Function example_cli::planned_utxos
    source · 
    pub fn planned_utxos<A: Anchor, O: ChainOracle, K: Clone + CanDerive>(
        graph: &KeychainTxGraph<A>,
        chain: &O,
        assets: &Assets<K>
    ) -> Result<Vec<PlannedUtxo<K, A>>, O::Error>
    
\ No newline at end of file
+planned_utxos in example_cli - Rust
    Function example_cli::planned_utxos
    source · 
    pub fn planned_utxos<A: Anchor, O: ChainOracle, K: Clone + CanDerive>(
        graph: &KeychainTxGraph<A>,
        chain: &O,
        assets: &Assets<K>
    ) -> Result<Vec<PlannedUtxo<K, A>>, O::Error>
    
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/example_cli/index.html b/docs-rs/bdk/nightly/latest/example_cli/index.html
index bf794089f3..64bc21d5b8 100644
--- a/docs-rs/bdk/nightly/latest/example_cli/index.html
+++ b/docs-rs/bdk/nightly/latest/example_cli/index.html
@@ -1,2 +1,2 @@
-example_cli - Rust
    Crate example_cli
    source · 
    Re-exports
    pub use anyhow;
    pub use clap;
    Structs
    Args
    CreateTxChange
    Init
    The initial state returned by init.
    Enums
    AddressCmd
    CoinSelectionAlgo
    Commands
    Keychain
    TxOutCmd
    Functions
    create_tx
    handle_commands
    init
    Parses command line arguments and initializes all components, creating
+example_cli - Rust
    Crate example_cli
    source · 
    Re-exports
    pub use anyhow;
    pub use bdk_file_store;
    pub use clap;
    Structs
    Args
    CreateTxChange
    Init
    The initial state returned by init.
    Enums
    AddressCmd
    CoinSelectionAlgo
    Commands
    Keychain
    TxOutCmd
    Functions
    create_tx
    handle_commands
    init
    Parses command line arguments and initializes all components, creating
 a file store with the given parameters, or loading one if it exists.
    planned_utxos
    Type Definitions
    Database
    KeychainChangeSet
    KeychainTxGraph
    PlannedUtxo
    
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/example_cli/struct.CreateTxChange.html b/docs-rs/bdk/nightly/latest/example_cli/struct.CreateTxChange.html
index d9b8ce57eb..e04b843a48 100644
--- a/docs-rs/bdk/nightly/latest/example_cli/struct.CreateTxChange.html
+++ b/docs-rs/bdk/nightly/latest/example_cli/struct.CreateTxChange.html
@@ -1,8 +1,8 @@
 CreateTxChange in example_cli - Rust
    Struct example_cli::CreateTxChange
    source · 
    pub struct CreateTxChange {
-    pub index_changeset: ChangeSet<Keychain>,
+    pub index_changeset: ChangeSet<Keychain>,
     pub change_keychain: Keychain,
     pub index: u32,
-}
    Fields§
    §index_changeset: ChangeSet<Keychain>§change_keychain: Keychain§index: u32
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Returns the argument unchanged.
    
+}
    Fields§
    §index_changeset: ChangeSet<Keychain>§change_keychain: Keychain§index: u32
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Returns the argument unchanged.
    
 
    Calls U::from(self).
    
 
    That is, this conversion is whatever the implementation of
 From<T> for U chooses to do.
    
diff --git a/docs-rs/bdk/nightly/latest/example_cli/struct.Init.html b/docs-rs/bdk/nightly/latest/example_cli/struct.Init.html
index 245e0f64fa..3c0b06a958 100644
--- a/docs-rs/bdk/nightly/latest/example_cli/struct.Init.html
+++ b/docs-rs/bdk/nightly/latest/example_cli/struct.Init.html
@@ -1,13 +1,13 @@
 Init in example_cli - Rust
    Struct example_cli::Init
    source · 
    pub struct Init<CS: Subcommand, S: Args, C> {
     pub args: Args<CS, S>,
     pub keymap: KeyMap,
-    pub index: KeychainTxOutIndex<Keychain>,
+    pub index: KeychainTxOutIndex<Keychain>,
     pub db: Mutex<Database<C>>,
     pub init_changeset: C,
 }
    Expand description
    The initial state returned by init.
    
 
    Fields§
    §args: Args<CS, S>
    Arguments parsed by the cli.
    
 
    §keymap: KeyMap
    Descriptor keymap.
    
-
    §index: KeychainTxOutIndex<Keychain>
    Keychain-txout index.
    
+
    §index: KeychainTxOutIndex<Keychain>
    Keychain-txout index.
    
 
    §db: Mutex<Database<C>>
    Persistence backend.
    
 
    §init_changeset: C
    Initial changeset.
    
 
    Auto Trait Implementations§
    Blanket Implementations§
    Gets the TypeId of self. Read more
    Immutably borrows from an owned value. Read more
    Mutably borrows from an owned value. Read more
    Returns the argument unchanged.
    
diff --git a/docs-rs/bdk/nightly/latest/example_cli/type.Database.html b/docs-rs/bdk/nightly/latest/example_cli/type.Database.html
index ce168eedcd..f9b77b1ab0 100644
--- a/docs-rs/bdk/nightly/latest/example_cli/type.Database.html
+++ b/docs-rs/bdk/nightly/latest/example_cli/type.Database.html
@@ -1 +1 @@
-Database in example_cli - Rust
    Type Definition example_cli::Database
    source · 
    pub type Database<C> = Persist<Store<C>, C>;
    
\ No newline at end of file
+Database in example_cli - Rust
    Type Definition example_cli::Database
    source · 
    pub type Database<C> = Persist<Store<C>, C>;
    
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/example_cli/type.KeychainChangeSet.html b/docs-rs/bdk/nightly/latest/example_cli/type.KeychainChangeSet.html
index f80a161e8f..6ad4e05f81 100644
--- a/docs-rs/bdk/nightly/latest/example_cli/type.KeychainChangeSet.html
+++ b/docs-rs/bdk/nightly/latest/example_cli/type.KeychainChangeSet.html
@@ -1 +1 @@
-KeychainChangeSet in example_cli - Rust
    Type Definition example_cli::KeychainChangeSet
    source · 
    pub type KeychainChangeSet<A> = (ChangeSet, ChangeSet<A, ChangeSet<Keychain>>);
    
\ No newline at end of file
+KeychainChangeSet in example_cli - Rust
    Type Definition example_cli::KeychainChangeSet
    source · 
    pub type KeychainChangeSet<A> = (ChangeSet, ChangeSet<A, ChangeSet<Keychain>>);
    
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/example_cli/type.KeychainTxGraph.html b/docs-rs/bdk/nightly/latest/example_cli/type.KeychainTxGraph.html
index 9537676556..9796925320 100644
--- a/docs-rs/bdk/nightly/latest/example_cli/type.KeychainTxGraph.html
+++ b/docs-rs/bdk/nightly/latest/example_cli/type.KeychainTxGraph.html
@@ -1 +1 @@
-KeychainTxGraph in example_cli - Rust
    Type Definition example_cli::KeychainTxGraph
    source · 
    pub type KeychainTxGraph<A> = IndexedTxGraph<A, KeychainTxOutIndex<Keychain>>;
    
\ No newline at end of file
+KeychainTxGraph in example_cli - Rust
    Type Definition example_cli::KeychainTxGraph
    source · 
    pub type KeychainTxGraph<A> = IndexedTxGraph<A, KeychainTxOutIndex<Keychain>>;
    
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/example_cli/type.PlannedUtxo.html b/docs-rs/bdk/nightly/latest/example_cli/type.PlannedUtxo.html
index 0c7e3a5618..67ef4aebc5 100644
--- a/docs-rs/bdk/nightly/latest/example_cli/type.PlannedUtxo.html
+++ b/docs-rs/bdk/nightly/latest/example_cli/type.PlannedUtxo.html
@@ -1 +1 @@
-PlannedUtxo in example_cli - Rust
    Type Definition example_cli::PlannedUtxo
    source · 
    pub type PlannedUtxo<K, A> = (Plan<K>, FullTxOut<A>);
    
\ No newline at end of file
+PlannedUtxo in example_cli - Rust
    Type Definition example_cli::PlannedUtxo
    source · 
    pub type PlannedUtxo<K, A> = (Plan<K>, FullTxOut<A>);
    
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/example_electrum/type.ChangeSet.html b/docs-rs/bdk/nightly/latest/example_electrum/type.ChangeSet.html
index e65eaa0923..e4f850fe8f 100644
--- a/docs-rs/bdk/nightly/latest/example_electrum/type.ChangeSet.html
+++ b/docs-rs/bdk/nightly/latest/example_electrum/type.ChangeSet.html
@@ -1 +1 @@
-ChangeSet in example_electrum - Rust
    Type Definition example_electrum::ChangeSet
    source · 
    pub(crate) type ChangeSet = (ChangeSet, ChangeSet<ConfirmationHeightAnchor, ChangeSet<Keychain>>);
    
\ No newline at end of file
+ChangeSet in example_electrum - Rust
    Type Definition example_electrum::ChangeSet
    source · 
    pub(crate) type ChangeSet = (ChangeSet, ChangeSet<ConfirmationHeightAnchor, ChangeSet<Keychain>>);
    
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/example_esplora/type.ChangeSet.html b/docs-rs/bdk/nightly/latest/example_esplora/type.ChangeSet.html
index b687a49edc..17a9a772b4 100644
--- a/docs-rs/bdk/nightly/latest/example_esplora/type.ChangeSet.html
+++ b/docs-rs/bdk/nightly/latest/example_esplora/type.ChangeSet.html
@@ -1 +1 @@
-ChangeSet in example_esplora - Rust
    Type Definition example_esplora::ChangeSet
    source · 
    pub(crate) type ChangeSet = (ChangeSet, ChangeSet<ConfirmationTimeHeightAnchor, ChangeSet<Keychain>>);
    
\ No newline at end of file
+ChangeSet in example_esplora - Rust
    Type Definition example_esplora::ChangeSet
    source · 
    pub(crate) type ChangeSet = (ChangeSet, ChangeSet<ConfirmationTimeHeightAnchor, ChangeSet<Keychain>>);
    
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/help.html b/docs-rs/bdk/nightly/latest/help.html
index 700c7c3d65..93fcd70225 100644
--- a/docs-rs/bdk/nightly/latest/help.html
+++ b/docs-rs/bdk/nightly/latest/help.html
@@ -1,2 +1 @@
-Rustdoc help
    Rustdoc help
    Back
    
\ No newline at end of file
+Rustdoc help
    Rustdoc help
    Back
    
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/implementors/bdk_chain/persist/trait.PersistBackend.js b/docs-rs/bdk/nightly/latest/implementors/bdk_chain/persist/trait.PersistBackend.js
index 425e53ff1b..ddbe6660df 100644
--- a/docs-rs/bdk/nightly/latest/implementors/bdk_chain/persist/trait.PersistBackend.js
+++ b/docs-rs/bdk/nightly/latest/implementors/bdk_chain/persist/trait.PersistBackend.js
@@ -1,4 +1,4 @@
 (function() {var implementors = {
 "bdk_chain":[],
-"bdk_file_store":[["impl<C> PersistBackend<C> for Store<C>where
        C: Append + Serialize + DeserializeOwned,    "]]
+"bdk_file_store":[["impl<C> PersistBackend<C> for Store<C>where
        C: Append + Serialize + DeserializeOwned,    "]]
 };if (window.register_implementors) {window.register_implementors(implementors);} else {window.pending_implementors = implementors;}})()
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/implementors/bdk_chain/tx_data_traits/trait.Append.js b/docs-rs/bdk/nightly/latest/implementors/bdk_chain/tx_data_traits/trait.Append.js
index 7b3d82a242..2b650fa85a 100644
--- a/docs-rs/bdk/nightly/latest/implementors/bdk_chain/tx_data_traits/trait.Append.js
+++ b/docs-rs/bdk/nightly/latest/implementors/bdk_chain/tx_data_traits/trait.Append.js
@@ -1,4 +1,4 @@
 (function() {var implementors = {
-"bdk":[["impl Append for ChangeSet"]],
+"bdk":[["impl Append for ChangeSet"]],
 "bdk_chain":[]
 };if (window.register_implementors) {window.register_implementors(implementors);} else {window.pending_implementors = implementors;}})()
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/implementors/core/cmp/trait.PartialEq.js b/docs-rs/bdk/nightly/latest/implementors/core/cmp/trait.PartialEq.js
index 0533357671..c3202789cf 100644
--- a/docs-rs/bdk/nightly/latest/implementors/core/cmp/trait.PartialEq.js
+++ b/docs-rs/bdk/nightly/latest/implementors/core/cmp/trait.PartialEq.js
@@ -1,6 +1,6 @@
 (function() {var implementors = {
 "bdk":[["impl PartialEq<PkOrF> for PkOrF"],["impl PartialEq<SatisfiableItem> for SatisfiableItem"],["impl PartialEq<Satisfaction> for Satisfaction"],["impl PartialEq<Policy> for Policy"],["impl PartialEq<Condition> for Condition"],["impl PartialEq<PolicyError> for PolicyError"],["impl PartialEq<ScriptContextEnum> for ScriptContextEnum"],["impl PartialEq<KeychainKind> for KeychainKind"],["impl PartialEq<LocalOutput> for LocalOutput"],["impl PartialEq<WeightedUtxo> for WeightedUtxo"],["impl PartialEq<Utxo> for Utxo"],["impl PartialEq<SignerId> for SignerId"],["impl PartialEq<SignerContext> for SignerContext"],["impl PartialEq<SignerOrdering> for SignerOrdering"],["impl PartialEq<TapLeavesOptions> for TapLeavesOptions"],["impl PartialEq<TxOrdering> for TxOrdering"],["impl PartialEq<ChangeSpendPolicy> for ChangeSpendPolicy"],["impl PartialEq<ChangeSet> for ChangeSet"],["impl PartialEq<AddressInfo> for AddressInfo"]],
-"bdk_chain":[["impl<A: PartialEq> PartialEq<ChainPosition<A>> for ChainPosition<A>"],["impl PartialEq<ConfirmationTime> for ConfirmationTime"],["impl PartialEq<BlockId> for BlockId"],["impl PartialEq<ConfirmationHeightAnchor> for ConfirmationHeightAnchor"],["impl PartialEq<ConfirmationTimeHeightAnchor> for ConfirmationTimeHeightAnchor"],["impl<A: PartialEq> PartialEq<FullTxOut<A>> for FullTxOut<A>"],["impl<A: PartialEq, IA: PartialEq> PartialEq<ChangeSet<A, IA>> for ChangeSet<A, IA>"],["impl<K: PartialEq> PartialEq<ChangeSet<K>> for ChangeSet<K>"],["impl PartialEq<Balance> for Balance"],["impl PartialEq<LocalChain> for LocalChain"],["impl PartialEq<MissingGenesisError> for MissingGenesisError"],["impl PartialEq<AlterCheckPointError> for AlterCheckPointError"],["impl PartialEq<CannotConnectError> for CannotConnectError"],["impl PartialEq<ApplyHeaderError> for ApplyHeaderError"],["impl<A: PartialEq> PartialEq<TxGraph<A>> for TxGraph<A>"],["impl<'a, T: PartialEq, A: PartialEq> PartialEq<TxNode<'a, T, A>> for TxNode<'a, T, A>"],["impl<'a, T: PartialEq, A: PartialEq> PartialEq<CanonicalTx<'a, T, A>> for CanonicalTx<'a, T, A>"],["impl PartialEq<CalculateFeeError> for CalculateFeeError"],["impl<A: PartialEq> PartialEq<ChangeSet<A>> for ChangeSet<A>"]],
+"bdk_chain":[["impl<A: PartialEq> PartialEq<ChainPosition<A>> for ChainPosition<A>"],["impl PartialEq<ConfirmationTime> for ConfirmationTime"],["impl PartialEq<BlockId> for BlockId"],["impl PartialEq<ConfirmationHeightAnchor> for ConfirmationHeightAnchor"],["impl PartialEq<ConfirmationTimeHeightAnchor> for ConfirmationTimeHeightAnchor"],["impl<A: PartialEq> PartialEq<FullTxOut<A>> for FullTxOut<A>"],["impl<A: PartialEq, IA: PartialEq> PartialEq<ChangeSet<A, IA>> for ChangeSet<A, IA>"],["impl<K: PartialEq> PartialEq<ChangeSet<K>> for ChangeSet<K>"],["impl PartialEq<Balance> for Balance"],["impl PartialEq<CheckPoint> for CheckPoint"],["impl PartialEq<Update> for Update"],["impl PartialEq<LocalChain> for LocalChain"],["impl PartialEq<MissingGenesisError> for MissingGenesisError"],["impl PartialEq<AlterCheckPointError> for AlterCheckPointError"],["impl PartialEq<CannotConnectError> for CannotConnectError"],["impl PartialEq<ApplyHeaderError> for ApplyHeaderError"],["impl<A: PartialEq> PartialEq<TxGraph<A>> for TxGraph<A>"],["impl<'a, T: PartialEq, A: PartialEq> PartialEq<TxNode<'a, T, A>> for TxNode<'a, T, A>"],["impl<'a, T: PartialEq, A: PartialEq> PartialEq<CanonicalTx<'a, T, A>> for CanonicalTx<'a, T, A>"],["impl PartialEq<CalculateFeeError> for CalculateFeeError"],["impl<A: PartialEq> PartialEq<ChangeSet<A>> for ChangeSet<A>"]],
 "bdk_coin_select":[["impl PartialEq<SelectionConstraint> for SelectionConstraint"],["impl PartialEq<ExcessStrategyKind> for ExcessStrategyKind"]],
 "example_cli":[["impl PartialEq<Keychain> for Keychain"]],
 "example_electrum":[["impl PartialEq<ScanOptions> for ScanOptions"]],
diff --git a/docs-rs/bdk/nightly/latest/implementors/core/convert/trait.AsRef.js b/docs-rs/bdk/nightly/latest/implementors/core/convert/trait.AsRef.js
index 10305d41fc..8528302c07 100644
--- a/docs-rs/bdk/nightly/latest/implementors/core/convert/trait.AsRef.js
+++ b/docs-rs/bdk/nightly/latest/implementors/core/convert/trait.AsRef.js
@@ -1,4 +1,4 @@
 (function() {var implementors = {
-"bdk":[["impl AsRef<[u8]> for KeychainKind"],["impl<D> AsRef<TxGraph<ConfirmationTimeHeightAnchor>> for Wallet<D>"]],
+"bdk":[["impl AsRef<[u8]> for KeychainKind"],["impl<D> AsRef<TxGraph<ConfirmationTimeHeightAnchor>> for Wallet<D>"]],
 "bdk_chain":[["impl<K> AsRef<BTreeMap<K, u32, Global>> for ChangeSet<K>"],["impl<A> AsRef<TxGraph<A>> for TxGraph<A>"]]
 };if (window.register_implementors) {window.register_implementors(implementors);} else {window.pending_implementors = implementors;}})()
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/implementors/core/convert/trait.From.js b/docs-rs/bdk/nightly/latest/implementors/core/convert/trait.From.js
index d984468602..1e946e7bfe 100644
--- a/docs-rs/bdk/nightly/latest/implementors/core/convert/trait.From.js
+++ b/docs-rs/bdk/nightly/latest/implementors/core/convert/trait.From.js
@@ -1,6 +1,6 @@
 (function() {var implementors = {
-"bdk":[["impl From<KeyError> for Error"],["impl From<Error> for Error"],["impl From<Error> for Error"],["impl From<Error> for Error"],["impl From<Error> for Error"],["impl From<Error> for Error"],["impl From<PolicyError> for Error"],["impl From<bool> for Satisfaction"],["impl From<SatisfiableItem> for Policy"],["impl<Ctx: ScriptContext> From<ExtendedPubKey> for ExtendedKey<Ctx>"],["impl<Ctx: ScriptContext> From<ExtendedPrivKey> for ExtendedKey<Ctx>"],["impl From<Error> for KeyError"],["impl From<Error> for KeyError"],["impl From<Hash> for SignerId"],["impl From<Fingerprint> for SignerId"],["impl From<Error> for SignerError"],["impl<P> From<Error> for CreateTxError<P>"],["impl<P> From<PolicyError> for CreateTxError<P>"],["impl<P> From<MiniscriptPsbtError> for CreateTxError<P>"],["impl<P> From<Error> for CreateTxError<P>"],["impl<P> From<Error> for CreateTxError<P>"],["impl From<BTreeMap<u32, Option<BlockHash>, Global>> for ChangeSet"],["impl From<ChangeSet<ConfirmationTimeHeightAnchor, ChangeSet<KeychainKind>>> for ChangeSet"]],
-"bdk_chain":[["impl From<ChainPosition<ConfirmationTimeHeightAnchor>> for ConfirmationTime"],["impl From<(u32, BlockHash)> for BlockId"],["impl From<BlockId> for (u32, BlockHash)"],["impl From<(&u32, &BlockHash)> for BlockId"],["impl<A, IA: Default> From<ChangeSet<A>> for ChangeSet<A, IA>"],["impl<A, K> From<ChangeSet<K>> for ChangeSet<A, ChangeSet<K>>"],["impl From<LocalChain> for BTreeMap<u32, BlockHash>"]],
+"bdk":[["impl From<KeyError> for Error"],["impl From<Error> for Error"],["impl From<Error> for Error"],["impl From<Error> for Error"],["impl From<Error> for Error"],["impl From<Error> for Error"],["impl From<PolicyError> for Error"],["impl From<bool> for Satisfaction"],["impl From<SatisfiableItem> for Policy"],["impl<Ctx: ScriptContext> From<ExtendedPubKey> for ExtendedKey<Ctx>"],["impl<Ctx: ScriptContext> From<ExtendedPrivKey> for ExtendedKey<Ctx>"],["impl From<Error> for KeyError"],["impl From<Error> for KeyError"],["impl From<Hash> for SignerId"],["impl From<Fingerprint> for SignerId"],["impl From<Error> for SignerError"],["impl<P> From<Error> for CreateTxError<P>"],["impl<P> From<PolicyError> for CreateTxError<P>"],["impl<P> From<MiniscriptPsbtError> for CreateTxError<P>"],["impl<P> From<Error> for CreateTxError<P>"],["impl<P> From<Error> for CreateTxError<P>"],["impl From<BTreeMap<u32, Option<BlockHash>, Global>> for ChangeSet"],["impl From<ChangeSet<ConfirmationTimeHeightAnchor, ChangeSet<KeychainKind>>> for ChangeSet"]],
+"bdk_chain":[["impl From<ChainPosition<ConfirmationTimeHeightAnchor>> for ConfirmationTime"],["impl From<(u32, BlockHash)> for BlockId"],["impl From<BlockId> for (u32, BlockHash)"],["impl From<(&u32, &BlockHash)> for BlockId"],["impl<A, IA: Default> From<ChangeSet<A>> for ChangeSet<A, IA>"],["impl<A, K> From<ChangeSet<K>> for ChangeSet<A, ChangeSet<K>>"]],
 "bdk_coin_select":[["impl From<usize> for BnbLimit"],["impl From<Duration> for BnbLimit"]],
 "bdk_file_store":[["impl From<Error> for IterError"],["impl From<Error> for FileError"]],
 "bdk_tmp_plan":[["impl From<Error> for SigningError"],["impl From<Error> for SigningError"]],
diff --git a/docs-rs/bdk/nightly/latest/implementors/core/marker/trait.StructuralPartialEq.js b/docs-rs/bdk/nightly/latest/implementors/core/marker/trait.StructuralPartialEq.js
index d2dbdf6fdc..490340beac 100644
--- a/docs-rs/bdk/nightly/latest/implementors/core/marker/trait.StructuralPartialEq.js
+++ b/docs-rs/bdk/nightly/latest/implementors/core/marker/trait.StructuralPartialEq.js
@@ -1,6 +1,6 @@
 (function() {var implementors = {
 "bdk":[["impl StructuralPartialEq for PkOrF"],["impl StructuralPartialEq for SatisfiableItem"],["impl StructuralPartialEq for Satisfaction"],["impl StructuralPartialEq for Policy"],["impl StructuralPartialEq for Condition"],["impl StructuralPartialEq for PolicyError"],["impl StructuralPartialEq for ScriptContextEnum"],["impl StructuralPartialEq for KeychainKind"],["impl StructuralPartialEq for LocalOutput"],["impl StructuralPartialEq for WeightedUtxo"],["impl StructuralPartialEq for Utxo"],["impl StructuralPartialEq for SignerId"],["impl StructuralPartialEq for SignerContext"],["impl StructuralPartialEq for SignerOrdering"],["impl StructuralPartialEq for TapLeavesOptions"],["impl StructuralPartialEq for TxOrdering"],["impl StructuralPartialEq for ChangeSpendPolicy"],["impl StructuralPartialEq for ChangeSet"],["impl StructuralPartialEq for AddressInfo"]],
-"bdk_chain":[["impl<A> StructuralPartialEq for ChainPosition<A>"],["impl StructuralPartialEq for ConfirmationTime"],["impl StructuralPartialEq for BlockId"],["impl StructuralPartialEq for ConfirmationHeightAnchor"],["impl StructuralPartialEq for ConfirmationTimeHeightAnchor"],["impl<A> StructuralPartialEq for FullTxOut<A>"],["impl<A, IA> StructuralPartialEq for ChangeSet<A, IA>"],["impl<K> StructuralPartialEq for ChangeSet<K>"],["impl StructuralPartialEq for Balance"],["impl StructuralPartialEq for MissingGenesisError"],["impl StructuralPartialEq for AlterCheckPointError"],["impl StructuralPartialEq for CannotConnectError"],["impl StructuralPartialEq for ApplyHeaderError"],["impl<A> StructuralPartialEq for TxGraph<A>"],["impl<'a, T, A> StructuralPartialEq for TxNode<'a, T, A>"],["impl<'a, T, A> StructuralPartialEq for CanonicalTx<'a, T, A>"],["impl StructuralPartialEq for CalculateFeeError"],["impl<A> StructuralPartialEq for ChangeSet<A>"]],
+"bdk_chain":[["impl<A> StructuralPartialEq for ChainPosition<A>"],["impl StructuralPartialEq for ConfirmationTime"],["impl StructuralPartialEq for BlockId"],["impl StructuralPartialEq for ConfirmationHeightAnchor"],["impl StructuralPartialEq for ConfirmationTimeHeightAnchor"],["impl<A> StructuralPartialEq for FullTxOut<A>"],["impl<A, IA> StructuralPartialEq for ChangeSet<A, IA>"],["impl<K> StructuralPartialEq for ChangeSet<K>"],["impl StructuralPartialEq for Balance"],["impl StructuralPartialEq for Update"],["impl StructuralPartialEq for LocalChain"],["impl StructuralPartialEq for MissingGenesisError"],["impl StructuralPartialEq for AlterCheckPointError"],["impl StructuralPartialEq for CannotConnectError"],["impl StructuralPartialEq for ApplyHeaderError"],["impl<A> StructuralPartialEq for TxGraph<A>"],["impl<'a, T, A> StructuralPartialEq for TxNode<'a, T, A>"],["impl<'a, T, A> StructuralPartialEq for CanonicalTx<'a, T, A>"],["impl StructuralPartialEq for CalculateFeeError"],["impl<A> StructuralPartialEq for ChangeSet<A>"]],
 "bdk_coin_select":[["impl StructuralPartialEq for SelectionConstraint"],["impl StructuralPartialEq for ExcessStrategyKind"]],
 "example_cli":[["impl StructuralPartialEq for Keychain"]],
 "example_electrum":[["impl StructuralPartialEq for ScanOptions"]],
diff --git a/docs-rs/bdk/nightly/latest/search-index.js b/docs-rs/bdk/nightly/latest/search-index.js
index c648676bee..dd8e840711 100644
--- a/docs-rs/bdk/nightly/latest/search-index.js
+++ b/docs-rs/bdk/nightly/latest/search-index.js
@@ -1,7 +1,7 @@
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Additional type …","Enum representation of the known valid ScriptContexts","Segwitv0 scripts","Single public key.","Single private key.","A descriptor bitcoin::PrivateKey with optional origin …","A descriptor SinglePubKey with optional origin information.","Single public key without any origin or range information.","Contents of a “sortedmulti” descriptor","Taproot scripts","Set of valid networks for a key","An xonly public key.","Extended private key (xpriv).","Extended public key (xpub).","Create a set containing mainnet, testnet, signet, and …","Returns the ScriptContext as a ScriptContextEnum","Replaces any wildcard (i.e. /*) in the key with a …","","","","","","","","","","","","","","","","","","","","","","","","","Depending on script Context, some of the Terminals might …","Depending on script Context, some of the script resource …","Check the consensus + policy(if not disabled) rules that …","Consensus rules at the Miniscript satisfaction time. It is …","Policy rules at the Miniscript satisfaction time. It is …","Check the consensus + policy(if not disabled) rules …","Each context has slightly different rules on what Pks are …","Depending on ScriptContext, fragments can be malleable. …","Check whether the given satisfaction is valid under the …","","","","","","","","","","","","","","","","","","","","","","","Whether the generated key should be “compressed” or not","","","Deprecated name for Self::at_derivation_index.","","Encode as a Bitcoin script","","","","","","","","","","","","","","","","","","","","","","","Returns the argument unchanged.","","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Create an instance given a public key and a set of valid …","Create an instance given a secret key and a set of valid …","","","Parse an expression tree into a SortedMultiVec","Full path, from the master key","Generate a key given the options with a random entropy","Generate a key with the default options and a random …","Generate a key given the extra options and the entropy","Generate a key with the default options and a given entropy","Return whether or not the key contains the private data","Whether or not the key has a wildcard","","","","","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Turn the key into a DescriptorKey within the requested …","Consume self and turn it into a DescriptorKey by adding …","","","","","","Consume self and turn it into an ExtendedKey","","","Consumes self and returns the key","Get as many keys as derivation paths in this key.","Get as many keys as derivation paths in this key.","Transform the ExtendedKey into an ExtendedPrivKey for the …","Transform the ExtendedKey into an ExtendedPubKey for the …","Whether or not the key has a wildcard","Returns whether the script context is Legacy","Returns whether the script context is …","Whether or not this key has multiple derivation paths.","Whether or not this key has multiple derivation paths.","Returns whether the script context is Segwitv0","Returns whether the script context is …","Returns whether the script context is Tap, aka Taproot or …","Returns whether the script context is …","","","signatures required","The public key.","The private key.","","Create a set only containing mainnet","The fingerprint of the master key associated with this …","Depending on script context, the size of a satifaction …","Maximum size, in bytes, of a satisfying witness. In …","Maximum number of witness elements used to satisfy the …","Compute the intersection of two sets","Local helper function to display error messages with …","Create a new instance of SortedMultiVec given a list of …","","Origin information (fingerprint and derivation path).","Origin information (fingerprint and derivation path).","Other top level checks that are context specific","Override the computed set of valid networks","","","","","Get the len of public key when serialized based on context …","public keys inside sorted Multi","","utility function to sanity a sorted multi vec","Attempt to produce a satisfying witness for the witness …","Size, in bytes of the script-pubkey. If this Miniscript is …","","The type of signature required for satisfaction","Create Terminal::Multi containing sorted pubkeys","Create a set containing testnet and regtest","","","","","","","","","","Returns the public version of this key.","","","","","Check top level consensus rules.","Check whether the top-level is type B","This will panic if fpk returns an uncompressed key when …","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","Trait to add functions to extract utxos and calculate fees.","The total transaction fee amount, sum of input amounts …","The transaction’s fee rate. This value will only be …","Get the TxOut for the specified input index, if it doesn’…","The address index selection strategy to use to derived an …","A derived address and the index it was found at. For …","An error that may occur when applying a block to Wallet.","Balance, differentiated into various categories.","Occurs when the update chain cannot connect with original …","The changes made to a wallet by applying an Update.","The error variant that occurs when the caller attempts to …","There was problem with the passed-in descriptor(s).","There was a problem with the passed-in descriptor(s).","There is a problem with the passed-in descriptor.","An error that may occur when inserting a transaction into …","Trait to check if a value is below the dust limit. We are …","Return the address for the current descriptor index if it …","Loading data from the persistence backend failed.","Loading from the persistence backend failed.","The error type when loading a Wallet from persistence.","The loaded genesis hash does not match what was provided.","The loaded network type does not match what was provided.","Data loaded from persistence is missing genesis hash.","Data loaded from persistence is missing network type.","Return a new address after incrementing the current …","The error type when constructing a fresh Wallet.","Error type for when we try load a Wallet from persistence …","Database already has data.","Wallet not initialized, persistence backend is empty.","Wallet is not initialized, persistence backend is empty.","Return the address for a specific descriptor index. Does …","Occurs when the connected_to hash does not match the hash …","An update to Wallet.","A Bitcoin wallet","We were unable to write the wallet’s data to the …","Writing to the persistence backend failed.","","Add an external signer","Address","Get unbounded script pubkey iterators for both Internal …","","Introduces a block of height to the wallet, and tries to …","Applies relevant transactions from block of height to the …","Apply relevant unconfirmed transactions to the wallet.","Applies an update to the wallet and stages the changes …","","","","","","","","","","","","","","","","","","","","","","","","Bump the fee of a transaction previously created with this …","Start building a transaction.","Calculates the fee of a given transaction. Returns 0 if tx …","Calculate the FeeRate for a given transaction.","Informs the wallet that you no longer intend to broadcast …","Update for the wallet’s internal LocalChain.","Changes to the LocalChain.","Get all the checkpoints the wallet is currently storing …","","","","","","","Coin selection","Commits all currently staged changed to the persistence …","Confirmed and immediately spendable balance","","","","","The derivation index of this wallet. It will return None …","Finds how the wallet derived the script pubkey spk.","Return the checksum of the public descriptor associated to …","","","","","","Errors that can be thrown by the Wallet","Wallet export","Finalize a PSBT, i.e., for each input determine if …","","","","","","","","","","","","","","","","","","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Infallibly return a derived address using the external …","Return the balance, separated into available, …","Returns the descriptor used to create addresses for a …","Infallibly return a derived address using the internal …","get the corresponding PSBT Input for a LocalUtxo","Get the signers","Get a single transaction from the wallet as a CanonicalTx …","Returns the utxo owned by this wallet corresponding to …","Update for the wallet’s internal TxGraph.","All coinbase outputs not yet matured","Child index of this address","Changes to IndexedTxGraph.","Add a new checkpoint to the wallet’s internal view of …","Add a transaction to the wallet’s internal view of the …","Inserts a TxOut at OutPoint into the wallet’s …","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Check whether or not a value is below dust limit","","Return whether or not a script is part of this wallet …","Type of keychain","Iterator over all keychains in this wallet","Contains the last active derivation indices per keychain (K…","Returns the latest checkpoint.","List all relevant outputs (includes both spent and …","Return the list of unspent outputs of this wallet","Load Wallet from the given persistence backend.","Get a reference to the inner LocalChain.","Get the Bitcoin network the wallet is using.","Stores the network type of the wallet.","Initialize an empty Wallet.","Creates a wallet that does not persist data.","Creates a wallet that does not persist data, with a custom …","Either loads Wallet from persistence, or initializes it if …","Either loads Wallet from persistence, or initializes it if …","Initialize an empty Wallet with a custom genesis hash.","The index of the next address that you would get if you …","Return the spending policies for the wallet’s descriptor","","","","","","Return the “public” version of the wallet’s …","Return the secp256k1 context used for all signing …","Compute the tx’s sent and received amounts (in satoshis).","","","Sign a transaction with all the wallet’s signers, in the …","Generalized signers","Get a reference to the inner KeychainTxOutIndex.","Returns the changes that will be committed with the next …","","","","","","","","","","","Get the whole balance visible to the wallet.","Iterate over the transactions in the wallet.","Unconfirmed UTXOs generated by a wallet tx","Get sum of trusted_pending and confirmed coins.","","","","","","","","","","","","Return a derived address using the external descriptor, …","Return a derived address using the internal (change) …","","","","","","","","","","","","Transaction builder","Get a reference to the inner TxGraph.","","","","","","","","","","","","Get an unbounded script pubkey iterator for the given …","Unconfirmed UTXOs received from an external wallet","","","","","","","","","","","","Deterministically generate a unique name given the …","Block hash of connected_to.","Expected block hash of connected_to, as derived from block.","The internal chain’s tip height.","The introduced transaction’s confirmation height.","The expected genesis block hash.","The expected network type.","The block hash loaded from persistence.","The network type loaded from persistence.","Branch and bound coin selection tries to avoid needing a …","Branch and bound coin selection possible attempts with …","Branch and bound coin selection","It’s possible to create spendable output from excess …","Trait for generalized coin selection algorithms","Result of a successful coin selection","Default coin selection algorithm used by TxBuilder if not …","Errors that can be thrown by the coin_selection module","Remaining amount after performing coin selection","Wallet’s UTXO set is not enough to cover recipient’s …","Simple and dumb coin selection","It’s not possible to create spendable output from excess …","OldestFirstCoinSelection always picks the utxo with the …","","","","","","","","","","","","","","","","","","","Perform the coin selection","","","","Decide if change can be created","","","","Remaining amount after deducing fees and outgoing outputs","Total fee amount for the selected utxos in satoshis","","","","","","","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","The total value of the inputs selected from the local …","Create new instance with target size for change output","","List of outputs selected for use as inputs","The total value of the inputs selected.","","","","","","","","","","","","","","","","","","","","","","","","","","","","","Sats available for spending","Sats needed for some transaction","Effective amount available to create change after …","The calculated fee for the drain TxOut with the selected …","Threshold to consider amount as dust for this particular …","The deducted change output fee","Exceeding amount of current selection over outgoing value …","Error returned from Wallet::build_fee_bump","The change_policy was set but the wallet does not have a …","There was an error with coin selection","Descriptor key conversion error","Error returned from TxBuilder::finish","There was a problem with the descriptors passed in","When bumping a tx the fee rate requested is lower than …","Node doesn’t have data to estimate a fee rate","When bumping a tx the absolute fee requested is lower than …","Wallet’s UTXO set is not enough to cover recipient’s …","Trying to replace a tx that has a sequence >= 0xFFFFFFFE","Requested LockTime is less than is required to spend from …","Miniscript PSBT error","Errors returned by miniscript when updating inconsistent …","In order to use the TxBuilder::add_global_xpubs option …","Missing non_witness_utxo on foreign utxo for given OutPoint","Cannot build a tx without recipients","manually_selected_only option is selected but no utxo has …","Output created is under the dust limit, 546 satoshis","Return error type for …","We were unable to write wallet data to the persistence …","There was a problem while extracting and manipulating …","Partially signed bitcoin transaction error","Cannot enable RBF with a Sequence >= 0xFFFFFFFE","Cannot enable RBF with Sequence given a required OP_CSV","Spending policy is not compatible with this KeychainKind","Happens when trying to bump a transaction that is already …","Thrown when a tx is not found in the internal database","Happens when trying to spend an UTXO that is not in the …","Happens when trying to spend an UTXO that is not in the …","Return error type for PsbtExt::update_input_with_descriptor","Requested invalid transaction version ‘0’","Requested transaction version 1, but at least 2 is needed …","","","","","","","","","","","","","","","Returns the argument unchanged.","Returns the argument unchanged.","","","","","","Returns the argument unchanged.","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","","","","","","","","","","","","","","","","","","","","Sats available for spending","Required OP_CSV Sequence","Sats needed for some transaction","Given RBF Sequence","Requested LockTime","Required LockTime","Required fee absolute value (satoshi)","Required fee rate","Structure that contains the export of a wallet","Alias for FullyNodedExport","Earliest block to rescan when looking for the wallet’s …","","","Return the internal descriptor, if present","Return the external descriptor","","Export a wallet","","Returns the argument unchanged.","","Calls U::from(self).","Arbitrary label for the wallet","","","","","","","The signer will sign all the leaves it has a key for.","Dummy identifier","The signer won’t sign the specified leaves.","To be used only by external libraries implementing …","The fingerprint of a BIP32 extended key","The signer won’t sign leaves other than the ones …","Input index is out of range","PSBT Input signer","The private key in use has the right fingerprint but …","The non_witness_utxo specified is invalid","Invalid SIGHASH for the signing context in use","Legacy context","Miniscript PSBT error","The fingerprint and derivation path are missing from the …","The private key is missing for the required public key","The non_witness_utxo field of the transaction is required …","The witness_script field of the transaction is required to …","The witness_utxo field of the transaction is required to …","The psbt contains a non-SIGHASH_ALL sighash in one of its …","The signer won’t sign any leaf.","Bitcoin HASH160 (RIPEMD160 after SHA256) hash of an ECDSA …","Segwit v0 context (BIP 143)","Error while computing the hash to sign","Options for a software signer","Common signer methods","Signing context","Signing error","Identifier of a signer in the SignersContainers. Used as a …","Defines the order in which signers are called","Wrapper to pair a signer with its context","Container for multiple signers","Taproot context (BIP 340)","Customize which taproot script-path leaves the signer …","PSBT signer","The user canceled the operation","Adds an external signer to the container for the specified …","Whether the signer should use the sighash_type set in the …","Whether we should grind ECDSA signature to ensure signing …","Create a map of public keys to secret keys","Whether the wallet should assume a specific height has …","","","","","","","","","","","","","","","","","Build a new signer container from a KeyMap","","","","","","","","","","","","","","","","","","","","","","Return the secret key for the signer","","","","","","","","Finds the signer with lowest ordering for a given id in …","","","","","","","","","","Returns the argument unchanged.","","","Returns the argument unchanged.","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","","Return the SignerId for this signer","","","","Returns the list of identifiers of all the signers in the …","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Create a wrapped signer from a signer and a context","Default constructor","","","","Removes a signer from the container and returns it","Whether to remove partial signatures from the PSBT inputs …","Whether to remove taproot specific fields from the PSBT on …","Sign a single psbt input","","","","Sign all the inputs of the psbt","","Whether we should try to sign a taproot transaction with …","Returns the list of signers in the container, sorted by …","Specifies which Taproot script-spend leaves we should sign …","","","","","","","","","Whether the signer should trust the witness_utxo, if the …","Whether to try finalizing the PSBT after the inputs are …","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","Whether the signer can sign for the internal key or not","Error returned from TxBuilder::add_foreign_utxo.","Error returned from TxBuilder::add_utxo and …","Error returned from TxBuilder::allow_shrinking","BIP69 / Lexicographic","Marker type to indicate the TxBuilder is being used to …","Use both change and non-change outputs (default)","Only use non-change outputs (see …","Policy regarding the use of change outputs when creating a …","Marker type to indicate the TxBuilder is being used to …","Requested outpoint doesn’t exist in the tx (vout greater …","Foreign utxo outpoint txid does not match PSBT input txid","Script/PubKey was not in the original transaction","Foreign utxo missing witness_utxo or non_witness_utxo","Only use change outputs (see TxBuilder::only_spend_change)","Randomized (default)","A transaction builder","Context in which the TxBuilder is valid","Ordering of the transaction’s inputs and outputs","Happens when trying to spend an UTXO that is not in the …","Unchanged","Add data as an output, using OP_RETURN","Add a foreign UTXO i.e. a UTXO not owned by this wallet.","Same as add_foreign_utxo but allows to set the nSequence …","Fill-in the PSBT_GLOBAL_XPUB field with the extended keys …","Add a recipient to the internal list","Add a utxo to the internal list of unspendable utxos","Add a utxo to the internal list of utxos that must be spent","Add the list of outpoints to the internal list of UTXOs …","Set whether or not the dust limit is checked.","Explicitly tells the wallet that it is allowed to reduce …","","","","","","","","","","","","","","","","","Set a specific ChangeSpendPolicy. See …","","","","","","","","","","","","","Choose the coin selection algorithm","Set the current blockchain height.","","","","","Do not spend change outputs","Sets the address to drain excess coins to.","Spend all the available inputs. This respects filters like …","Enable signaling RBF","Enable signaling RBF with a specific nSequence value","","","Set an absolute fee The fee_absolute method refers to the …","Set a custom fee rate.","Finish building the transaction.","","","","","","","","","","","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","","","Fill-in the psbt::Output::redeem_script and …","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Only spend utxos added by add_utxo.","Use a specific nLockTime while creating the transaction","Only spend change outputs","Only Fill-in the psbt::Input::witness_utxo field when …","Choose the ordering for inputs and outputs of the …","","","Set the policy path to use while creating the transaction …","","","","Replace the recipients already added with a new list","Sign with a specific sig hash","Sort transaction inputs and outputs by TxOrdering variant","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","Replace the internal list of unspendable utxos with a new …","Build a transaction with a specific version","","","","","","","","","Foreign UTXO outpoint","PSBT input 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Must be a …","Errors thrown while working with keys","Alias type for a map of public key to secret key","Legacy scripts","Custom error message","Miniscript error","Multiple extended private keys.","Multiple extended public keys.","Extra options required by the generate_with_entropy","A private extended key, aka an xprv","Options for generating a PrivateKey","A public extended key, aka an xpub","The ScriptContext for Miniscript. Additional type …","Enum representation of the known valid ScriptContexts","Segwitv0 scripts","Single public key.","Single private key.","A descriptor bitcoin::PrivateKey with optional origin …","A descriptor SinglePubKey with optional origin information.","Single public key without any origin or range information.","Contents of a “sortedmulti” descriptor","Taproot scripts","Set of valid networks for a key","An xonly public key.","Extended private key (xpriv).","Extended public key (xpub).","Create a set containing mainnet, testnet, signet, and …","Returns the ScriptContext as a ScriptContextEnum","Replaces any wildcard (i.e. /*) in the key with a …","","","","","","","","","","","","","","","","","","","","","","","","","Depending on script Context, some of the Terminals might …","Depending on script Context, some of the script resource …","Check the consensus + policy(if not disabled) rules that …","Consensus rules at the Miniscript satisfaction time. It is …","Policy rules at the Miniscript satisfaction time. It is …","Check the consensus + policy(if not disabled) rules …","Each context has slightly different rules on what Pks are …","Depending on ScriptContext, fragments can be malleable. …","Check whether the given satisfaction is valid under the …","","","","","","","","","","","","","","","","","","","","","","","Whether the generated key should be “compressed” or not","","","Deprecated name for Self::at_derivation_index.","","Encode as a Bitcoin script","","","","","","","","","","","","","","","","","","","","","","","Returns the argument unchanged.","","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Create an instance given a public key and a set of valid …","Create an instance given a secret key and a set of valid …","","","Parse an expression tree into a SortedMultiVec","Full path, from the master key","Generate a key given the options with a random entropy","Generate a key with the default options and a random …","Generate a key given the extra options and the entropy","Generate a key with the default options and a given entropy","Return whether or not the key contains the private data","Whether or not the key has a wildcard","","","","","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Turn the key into a DescriptorKey within the requested …","Consume self and turn it into a DescriptorKey by adding …","","","","","","Consume self and turn it into an ExtendedKey","","","Consumes self and returns the key","Get as many keys as derivation paths in this key.","Get as many keys as derivation paths in this key.","Transform the ExtendedKey into an ExtendedPrivKey for the …","Transform the ExtendedKey into an ExtendedPubKey for the …","Whether or not the key has a wildcard","Returns whether the script context is Legacy","Returns whether the script context is …","Whether or not this key has multiple derivation paths.","Whether or not this key has multiple derivation paths.","Returns whether the script context is Segwitv0","Returns whether the script context is …","Returns whether the script context is Tap, aka Taproot or …","Returns whether the script context is …","","","signatures required","The public key.","The private key.","","Create a set only containing mainnet","The fingerprint of the master key associated with this …","Depending on script context, the size of a satifaction …","Maximum size, in bytes, of a satisfying witness. In …","Maximum number of witness elements used to satisfy the …","Compute the intersection of two sets","Local helper function to display error messages with …","Create a new instance of SortedMultiVec given a list of …","","Origin information (fingerprint and derivation path).","Origin information (fingerprint and derivation path).","Other top level checks that are context specific","Override the computed set of valid networks","","","","","Get the len of public key when serialized based on context …","public keys inside sorted Multi","","utility function to sanity a sorted multi vec","Attempt to produce a satisfying witness for the witness …","Size, in bytes of the script-pubkey. If this Miniscript is …","","The type of signature required for satisfaction","Create Terminal::Multi containing sorted pubkeys","Create a set containing testnet and regtest","","","","","","","","","","Returns the public version of this key.","","","","","Check top level consensus rules.","Check whether the top-level is type B","This will panic if fpk returns an uncompressed key when …","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","Trait to add functions to extract utxos and calculate fees.","The total transaction fee amount, sum of input amounts …","The transaction’s fee rate. This value will only be …","Get the TxOut for the specified input index, if it doesn’…","The address index selection strategy to use to derived an …","A derived address and the index it was found at. For …","An error that may occur when applying a block to Wallet.","Balance, differentiated into various categories.","Occurs when the update chain cannot connect with original …","The changes made to a wallet by applying an Update.","The error variant that occurs when the caller attempts to …","There was problem with the passed-in descriptor(s).","There was a problem with the passed-in descriptor(s).","There is a problem with the passed-in descriptor.","An error that may occur when inserting a transaction into …","Trait to check if a value is below the dust limit. We are …","Return the address for the current descriptor index if it …","Loading data from the persistence backend failed.","Loading from the persistence backend failed.","The error type when loading a Wallet from persistence.","The loaded genesis hash does not match what was provided.","The loaded network type does not match what was provided.","Data loaded from persistence is missing genesis hash.","Data loaded from persistence is missing network type.","Return a new address after incrementing the current …","The error type when constructing a fresh Wallet.","Error type for when we try load a Wallet from persistence …","Database already has data.","Wallet not initialized, persistence backend is empty.","Wallet is not initialized, persistence backend is empty.","Return the address for a specific descriptor index. Does …","Occurs when the connected_to hash does not match the hash …","An update to Wallet.","A Bitcoin wallet","We were unable to write the wallet’s data to the …","Writing to the persistence backend failed.","","Add an external signer","Address","Get unbounded script pubkey iterators for both Internal …","","Introduces a block of height to the wallet, and tries to …","Applies relevant transactions from block of height to the …","Apply relevant unconfirmed transactions to the wallet.","Applies an update to the wallet and stages the changes …","","","","","","","","","","","","","","","","","","","","","","","","Bump the fee of a transaction previously created with this …","Start building a transaction.","Calculates the fee of a given transaction. Returns 0 if tx …","Calculate the FeeRate for a given transaction.","Informs the wallet that you no longer intend to broadcast …","Update for the wallet’s internal LocalChain.","Changes to the LocalChain.","Get all the checkpoints the wallet is currently storing …","","","","","","","Coin selection","Commits all currently staged changed to the persistence …","Confirmed and immediately spendable balance","","","","","The derivation index of this wallet. It will return None …","Finds how the wallet derived the script pubkey spk.","Return the checksum of the public descriptor associated to …","","","","","","Errors that can be thrown by the Wallet","Wallet export","Finalize a PSBT, i.e., for each input determine if …","","","","","","","","","","","","","","","","","","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Infallibly return a derived address using the external …","Return the balance, separated into available, …","Returns the descriptor used to create addresses for a …","Infallibly return a derived address using the internal …","get the corresponding PSBT Input for a LocalUtxo","Get the signers","Get a single transaction from the wallet as a CanonicalTx …","Returns the utxo owned by this wallet corresponding to …","Update for the wallet’s internal TxGraph.","All coinbase outputs not yet matured","Child index of this address","Changes to IndexedTxGraph.","Add a new checkpoint to the wallet’s internal view of …","Add a transaction to the wallet’s internal view of the …","Inserts a TxOut at OutPoint into the wallet’s …","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Check whether or not a value is below dust limit","","Return whether or not a script is part of this wallet …","Type of keychain","Iterator over all keychains in this wallet","Contains the last active derivation indices per keychain (K…","Returns the latest checkpoint.","List all relevant outputs (includes both spent and …","Return the list of unspent outputs of this wallet","Load Wallet from the given persistence backend.","Get a reference to the inner LocalChain.","Get the Bitcoin network the wallet is using.","Stores the network type of the wallet.","Initialize an empty Wallet.","Creates a wallet that does not persist data.","Creates a wallet that does not persist data, with a custom …","Either loads Wallet from persistence, or initializes it if …","Either loads Wallet from persistence, or initializes it if …","Initialize an empty Wallet with a custom genesis hash.","The index of the next address that you would get if you …","Return the spending policies for the wallet’s descriptor","","","","","","Return the “public” version of the wallet’s …","Return the secp256k1 context used for all signing …","Compute the tx’s sent and received amounts (in satoshis).","","","Sign a transaction with all the wallet’s signers, in the …","Generalized signers","Get a reference to the inner KeychainTxOutIndex.","Returns the changes that will be committed with the next …","","","","","","","","","","","Get the whole balance visible to the wallet.","Iterate over the transactions in the wallet.","Unconfirmed UTXOs generated by a wallet tx","Get sum of trusted_pending and confirmed coins.","","","","","","","","","","","","Return a derived address using the external descriptor, …","Return a derived address using the internal (change) …","","","","","","","","","","","","Transaction builder","Get a reference to the inner TxGraph.","","","","","","","","","","","","Get an unbounded script pubkey iterator for the given …","Unconfirmed UTXOs received from an external wallet","","","","","","","","","","","","Deterministically generate a unique name given the …","Block hash of connected_to.","Expected block hash of connected_to, as derived from block.","The internal chain’s tip height.","The introduced transaction’s confirmation height.","The expected genesis block hash.","The expected network type.","The block hash loaded from persistence.","The network type loaded from persistence.","Branch and bound coin selection tries to avoid needing a …","Branch and bound coin selection possible attempts with …","Branch and bound coin selection","It’s possible to create spendable output from excess …","Trait for generalized coin selection algorithms","Result of a successful coin selection","Default coin selection algorithm used by TxBuilder if not …","Errors that can be thrown by the coin_selection module","Remaining amount after performing coin selection","Wallet’s UTXO set is not enough to cover recipient’s …","Simple and dumb coin selection","It’s not possible to create spendable output from excess …","OldestFirstCoinSelection always picks the utxo with the …","","","","","","","","","","","","","","","","","","","Perform the coin selection","","","","Decide if change can be created","","","","Remaining amount after deducing fees and outgoing outputs","Total fee amount for the selected utxos in satoshis","","","","","","","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","The total value of the inputs selected from the local …","Create new instance with target size for change output","","List of outputs selected for use as inputs","The total value of the inputs selected.","","","","","","","","","","","","","","","","","","","","","","","","","","","","","Sats available for spending","Sats needed for some transaction","Effective amount available to create change after …","The calculated fee for the drain TxOut with the selected …","Threshold to consider amount as dust for this particular …","The deducted change output fee","Exceeding amount of current selection over outgoing value …","Error returned from Wallet::build_fee_bump","The change_policy was set but the wallet does not have a …","There was an error with coin selection","Descriptor key conversion error","Error returned from TxBuilder::finish","There was a problem with the descriptors passed in","When bumping a tx the fee rate requested is lower than …","Node doesn’t have data to estimate a fee rate","When bumping a tx the absolute fee requested is lower than …","Wallet’s UTXO set is not enough to cover recipient’s …","Trying to replace a tx that has a sequence >= 0xFFFFFFFE","Requested LockTime is less than is required to spend from …","Miniscript PSBT error","Errors returned by miniscript when updating inconsistent …","In order to use the TxBuilder::add_global_xpubs option …","Missing non_witness_utxo on foreign utxo for given OutPoint","Cannot build a tx without recipients","manually_selected_only option is selected but no utxo has …","Output created is under the dust limit, 546 satoshis","Return error type for …","We were unable to write wallet data to the persistence …","There was a problem while extracting and manipulating …","Partially signed bitcoin transaction error","Cannot enable RBF with a Sequence >= 0xFFFFFFFE","Cannot enable RBF with Sequence given a required OP_CSV","Spending policy is not compatible with this KeychainKind","Happens when trying to bump a transaction that is already …","Thrown when a tx is not found in the internal database","Happens when trying to spend an UTXO that is not in the …","Happens when trying to spend an UTXO that is not in the …","Return error type for PsbtExt::update_input_with_descriptor","Requested invalid transaction version ‘0’","Requested transaction version 1, but at least 2 is needed …","","","","","","","","","","","","","","","Returns the argument unchanged.","Returns the argument unchanged.","","","","","","Returns the argument unchanged.","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","","","","","","","","","","","","","","","","","","","","Sats available for spending","Required OP_CSV Sequence","Sats needed for some transaction","Given RBF Sequence","Requested LockTime","Required LockTime","Required fee absolute value (satoshi)","Required fee rate","Structure that contains the export of a wallet","Alias for FullyNodedExport","Earliest block to rescan when looking for the wallet’s …","","","Return the internal descriptor, if present","Return the external descriptor","","Export a wallet","","Returns the argument unchanged.","","Calls U::from(self).","Arbitrary label for the wallet","","","","","","","The signer will sign all the leaves it has a key for.","Dummy identifier","The signer won’t sign the specified leaves.","To be used only by external libraries implementing …","The fingerprint of a BIP32 extended key","The signer won’t sign leaves other than the ones …","Input index is out of range","PSBT Input signer","The private key in use has the right fingerprint but …","The non_witness_utxo specified is invalid","Invalid SIGHASH for the signing context in use","Legacy context","Miniscript PSBT error","The fingerprint and derivation path are missing from the …","The private key is missing for the required public key","The non_witness_utxo field of the transaction is required …","The witness_script field of the transaction is required to …","The witness_utxo field of the transaction is required to …","The psbt contains a non-SIGHASH_ALL sighash in one of its …","The signer won’t sign any leaf.","Bitcoin HASH160 (RIPEMD160 after SHA256) hash of an ECDSA …","Segwit v0 context (BIP 143)","Error while computing the hash to sign","Options for a software signer","Common signer methods","Signing context","Signing error","Identifier of a signer in the SignersContainers. Used as a …","Defines the order in which signers are called","Wrapper to pair a signer with its context","Container for multiple signers","Taproot context (BIP 340)","Customize which taproot script-path leaves the signer …","PSBT signer","The user canceled the operation","Adds an external signer to the container for the specified …","Whether the signer should use the sighash_type set in the …","Whether we should grind ECDSA signature to ensure signing …","Create a map of public keys to secret keys","Whether the wallet should assume a specific height has …","","","","","","","","","","","","","","","","","Build a new signer container from a KeyMap","","","","","","","","","","","","","","","","","","","","","","Return the secret key for the signer","","","","","","","","Finds the signer with lowest ordering for a given id in …","","","","","","","","","","Returns the argument unchanged.","","","Returns the argument unchanged.","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","","Return the SignerId for this signer","","","","Returns the list of identifiers of all the signers in the …","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Create a wrapped signer from a signer and a context","Default constructor","","","","Removes a signer from the container and returns it","Whether to remove partial signatures from the PSBT inputs …","Whether to remove taproot specific fields from the PSBT on …","Sign a single psbt input","","","","Sign all the inputs of the psbt","","Whether we should try to sign a taproot transaction with …","Returns the list of signers in the container, sorted by …","Specifies which Taproot script-spend leaves we should sign …","","","","","","","","","Whether the signer should trust the witness_utxo, if the …","Whether to try finalizing the PSBT after the inputs are …","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","Whether the signer can sign for the internal key or not","Error returned from TxBuilder::add_foreign_utxo.","Error returned from TxBuilder::add_utxo and …","Error returned from TxBuilder::allow_shrinking","BIP69 / Lexicographic","Marker type to indicate the TxBuilder is being used to …","Use both change and non-change outputs (default)","Only use non-change outputs (see …","Policy regarding the use of change outputs when creating a …","Marker type to indicate the TxBuilder is being used to …","Requested outpoint doesn’t exist in the tx (vout greater …","Foreign utxo outpoint txid does not match PSBT input txid","Script/PubKey was not in the original transaction","Foreign utxo missing witness_utxo or non_witness_utxo","Only use change outputs (see TxBuilder::only_spend_change)","Randomized (default)","A transaction builder","Context in which the TxBuilder is valid","Ordering of the transaction’s inputs and outputs","Happens when trying to spend an UTXO that is not in the …","Unchanged","Add data as an output, using OP_RETURN","Add a foreign UTXO i.e. a UTXO not owned by this wallet.","Same as add_foreign_utxo but allows to set the nSequence …","Fill-in the PSBT_GLOBAL_XPUB field with the extended keys …","Add a recipient to the internal list","Add a utxo to the internal list of unspendable utxos","Add a utxo to the internal list of utxos that must be spent","Add the list of outpoints to the internal list of UTXOs …","Set whether or not the dust limit is checked.","Explicitly tells the wallet that it is allowed to reduce …","","","","","","","","","","","","","","","","","Set a specific ChangeSpendPolicy. See …","","","","","","","","","","","","","Choose the coin selection algorithm","Set the current blockchain height.","","","","","Do not spend change outputs","Sets the address to drain excess coins to.","Spend all the available inputs. This respects filters like …","Enable signaling RBF","Enable signaling RBF with a specific nSequence value","","","Set an absolute fee The fee_absolute method refers to the …","Set a custom fee rate.","Finish building the transaction.","","","","","","","","","","","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","","","Fill-in the psbt::Output::redeem_script and …","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Only spend utxos added by add_utxo.","Use a specific nLockTime while creating the transaction","Only spend change outputs","Only Fill-in the psbt::Input::witness_utxo field when …","Choose the ordering for inputs and outputs of the …","","","Set the policy path to use while creating the transaction …","","","","Replace the recipients already added with a new list","Sign with a specific sig hash","Sort transaction inputs and outputs by TxOrdering variant","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","Replace the internal list of unspendable utxos with a new …","Build a transaction with a specific version","","","","","","","","","Foreign UTXO outpoint","PSBT input 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that “anchors” blockchain data to a specific …","An Anchor that can be constructed from a given block, …","Trait that makes an object appendable.","Maximum BIP32 derivation index.","A reference to a block in the canonical chain.","How many confirmations are needed f or a coinbase output …","Represents a service that tracks the blockchain.","Represents the observed position of some chain data.","An Anchor implementation that also records the exact …","Block height and timestamp at which a transaction is …","An Anchor implementation that also records the exact …","The chain data is seen as confirmed, and in anchored by A.","The transaction is confirmed","A trait to extend the functionality of a miniscript …","Error type.","A TxOut with as much data as we can retrieve about it","","The error the backend returns when it fails to load …","Persist wraps a PersistBackend (B) to create a convenient …","A persistence backend for Persist.","An iterator for derived script pubkeys.","An index storing TxOuts that have a script pubkey that …","","The chain data is not confirmed and last seen in the …","The transaction is unconfirmed","The error the backend returns when it fails to write.","The script pubkeys that are being tracked by the index.","Returns the BlockId that the associated blockchain data is …","","","","The anchor block.","The anchor block.","Append another object of the same type onto self.","","","","","","","","","","","","","","","","","","","","","The position of the transaction in outpoint in the overall …","","","","","","","","","","","","","","","","","Maps a ChainPosition<&A> into a ChainPosition<A> by …","","","","","","","Commit the staged changes to the underlying persistence …","The exact confirmation height of the transaction.","The confirmation height of the transaction being anchored.","Get the upper bound of the chain data’s confirmation …","Get the upper bound of the chain data’s confirmation …","Determines the upper bound of the confirmation height.","","","The confirmation time of the transaction being anchored.","","","","","Get a reference to the internal descriptor.","","","","","Returns the minimum value (in satoshis) at which an output …","","","","","","","","","","","","","","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","","Returns the argument unchanged.","","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Construct the anchor from a given block, block height and …","","","","Get the best chain’s chain tip.","","","","","","The hash of the block.","The height of the block.","Returns the index associated with the script pubkey.","","","Contains the IndexedTxGraph and associated types. Refer to …","","Adds a script pubkey to scan for. Returns false and does …","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","","Determines whether block of BlockId exists as an ancestor …","Returns whether ChainPosition is confirmed or not.","Returns whether ConfirmationTime is the confirmed variant.","Whether the utxo is/was/will be spendable with chain tip.","Returns whether the structure is considered empty.","Whether the txout is considered mature.","Whether this output is on a coinbase transaction.","Whether any of the inputs of this transaction spend a …","","Returns whether the script pubkey at index has been used …","Module for keychain related structures.","Return the aggregate changeset C from persistence.","The LocalChain is a local implementation of ChainOracle.","Marks the script pubkey at index as used even though it …","","Computes the net value that this transaction gives to the …","Create a new Persist from PersistBackend.","Create a new script pubkey iterator from descriptor.","Create a new script pubkey iterator from descriptor and a …","","","The location of the TxOut.","Get a reference to the set of indexed outpoints.","Iterates over all the outputs with script pubkeys in an …","","","","","","","Scans a transaction’s outputs for matching script …","Scan a single TxOut for a matching script pubkey and …","Computes total input value going from script pubkeys in …","","","","","The txid and chain position of the transaction (if any) …","Returns the script that has been inserted at the index.","Stage a changeset to be committed later with commit.","Stages a new changeset and commits it (along with any …","Get the changes that have not been committed yet.","","","","","","","","","","","","","","","","","","","","","","","","","","","Module for structures that store and traverse transactions.","Returns the txout and script pubkey index of the TxOut at …","The TxOut.","Iterate over all known txouts that spend to tracked script …","Finds all txouts on a transaction that has previously been …","","","","","","","","","","Construct an unconfirmed variant using the given last_seen …","Undoes the effect of mark_used. Returns whether the index …","Iterates over all unused script pubkeys in an index range.","","","","","","","","","","Writes a changeset to the persistence backend.","Confirmation height.","The last-seen timestamp in unix seconds.","Confirmation time in unix seconds.","Represents changes to an IndexedTxGraph.","The resultant “changeset” when new transaction data is …","The IndexedTxGraph combines a TxGraph and an Indexer …","Utilities for indexing transaction data.","","Batch insert all transactions of the given block of height.","Batch insert all transactions of the given block of height…","Apply changeset to itself.","Applies the ChangeSet to the IndexedTxGraph.","Apply an update directly.","Batch insert transactions, filtering out those that are …","Batch insert unconfirmed transactions, filtering out those …","Batch insert unconfirmed transactions.","","","","","","","","","","","","","Returns the argument unchanged.","","Returns the argument unchanged.","","Get a reference of the internal transaction graph.","TxGraph changeset.","Transaction index.","Scans a transaction for relevant outpoints, which are …","Scan and index the given outpoint and txout.","Indexer changeset.","Determines the ChangeSet between self and an empty Indexer.","Determines the ChangeSet between self and an empty …","Insert an anchor for a given transaction.","Insert a unix timestamp of when a transaction is seen in …","Insert and index a transaction into the graph.","Insert a floating txout of given outpoint.","Calls U::from(self).","Calls U::from(self).","","Determines whether the transaction should be included in …","Construct a new IndexedTxGraph with a given index.","","","","","","","","","","","Balance, differentiated into various categories.","Represents updates to the derivation index of a …","KeychainTxOutIndex controls how script pubkeys are …","","Add a keychain to the tracker’s txout_index with a …","Get unbounded spk iterators for all keychains.","Append another ChangeSet into self.","","Applies the derivation changeset to the KeychainTxOutIndex…","Get the inner map of the keychain to its new derivation …","","","","","","","","","","","","","","Confirmed and immediately spendable balance","","","","","","","","","","","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","All coinbase outputs not yet matured","Returns the keychain and keychain index associated with …","","","","Return a reference to the internal SpkTxOutIndex.","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Returns whether the changeset are empty.","","Returns whether the spk under the keychain’s index has …","Iterate over all OutPoints that point to TxOuts with …","Iterate over OutPoints that point to TxOuts with script …","Return a reference to the internal map of keychain to …","Get the last derivation index revealed for keychain.","Get the last derivation index that is revealed for each …","Returns the highest derivation index of the keychain where …","Returns the highest derivation index of each keychain that …","Get the lookahead setting.","Store lookahead scripts until target_index (inclusive).","Marks the script pubkey at index as used even though the …","Computes the net value that this transaction gives to the …","Construct a KeychainTxOutIndex with the given lookahead.","Get the next derivation index for keychain. The next index …","Gets the next unused script pubkey in the keychain. I.e., …","Get a reference to the set of indexed outpoints.","Attempts to reveal the next script pubkey for keychain.","Reveals script pubkeys of the keychain’s descriptor up …","Convenience method to call Self::reveal_to_target on …","Iterate over revealed spks of the given keychain.","Iterate over revealed spks of all keychains.","Computes total input value going from script pubkeys in …","","","Return the script that exists under the given keychain’s …","","","","","Get the whole balance visible to the wallet.","Unconfirmed UTXOs generated by a wallet tx","Get sum of trusted_pending and confirmed coins.","","","","","","","Return the TxOut of outpoint if it has been indexed.","Iterate over known txouts that spend to tracked script …","Finds all txouts on a transaction that has previously been …","","","","Get an unbounded spk iterator over a given keychain.","Undoes the effect of mark_used. Returns whether the index …","Unconfirmed UTXOs received from an external wallet","Iterate over revealed, but unused, spks of the given …","Iterate over revealed, but unused, spks of all keychains.","","","","Represents a failure when trying to insert/remove a …","The error type for LocalChain::apply_header_connected_to.","Occurs when the update cannot connect with the original …","Occurs when an update does not have a common checkpoint …","The ChangeSet represents changes to LocalChain.","A LocalChain checkpoint is used to find the agreement …","Iterates over checkpoints backwards.","Occurs when connected_to block conflicts with either the …","This is a local implementation of ChainOracle.","An error which occurs when a LocalChain is constructed …","Used to update LocalChain.","Apply the given changeset.","Update the chain with a given Header connecting it with …","Update the chain with a given Header at height which you …","Applies the given update to the chain.","Get the BlockId of the checkpoint.","Get a reference to the internal index mapping the height …","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","Removes blocks from (and inclusive of) the given block_id.","","","","","","Extends the checkpoint linked list by a iterator of block …","","","","","","","","","","","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Construct a checkpoint from a list of BlockIds in …","Constructs a LocalChain from a BTreeMap of height to …","Construct a LocalChain from an initial changeset.","Construct LocalChain from genesis hash.","Construct a checkpoint from the given header and block …","Construct a LocalChain from a given checkpoint tip.","Get the genesis hash.","","Get the block hash of the checkpoint.","Get the height of the checkpoint.","The checkpoint’s height.","Derives an initial ChangeSet, meaning that it can be …","Insert a BlockId.","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","","","Convenience method to convert the CheckPoint into an Update…","Whether the update allows for introducing older blocks.","","Iterate from this checkpoint in descending height.","Iterate over checkpoints in descending height order.","Construct a new base block at the front of a linked list.","","The original checkpoint’s block hash which cannot be …","Get the previous checkpoint in the chain","","","","","Puts another checkpoint onto the linked list representing …","Get the highest checkpoint.","The update chain’s new tip.","","","","","","","","","","","","","","","","","","","","The suggested checkpoint to include to connect the two …","","","","","","","","","","","","","","","","","The attempted update to the original_block hash.","","","","","","","","","Errors returned by TxGraph::calculate_fee.","A transaction that is included in the chain, or is still …","The ChangeSet represents changes to a TxGraph.","Missing TxOut for one or more of the inputs of the tx","When the transaction is invalid according to the graph it …","An iterator that traverses ancestors of a given root …","An iterator that traverses transaction descendants.","A graph of transactions and spends.","A transaction node in the TxGraph.","Get all transaction anchors known by TxGraph.","Iterate over all tx outputs known by TxGraph.","Iterates over the heights of that the new transaction …","The blocks that the transaction is “anchored” in.","Added anchors.","","Applies ChangeSet to TxGraph.","Extends this graph with another so that self becomes the …","","Get the total balance of outpoints that are in chain of …","Batch insert unconfirmed transactions.","","","","","","","","","","","","","","","Calculates the fee of a given transaction. Returns 0 if tx …","How the transaction is observed as (confirmed or …","","","","","","","","","","","","","","","","","","","Given a transaction, return an iterator of txids that …","","","","","","Get a filtered list of outputs from the given outpoints …","Get a filtered list of unspent outputs (UTXOs) from the …","Iterate over floating txouts known by TxGraph.","","","","","","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Iterate over all full transactions in the graph.","Get the position of the transaction in chain with tip …","Get the txid of the spending transaction and where the …","Get a transaction by txid. This only returns Some for full …","Get a transaction node by txid. This only returns Some for …","Obtains a single tx output (if any) at the specified …","Determines the ChangeSet between self and an empty TxGraph.","Inserts the given anchor into TxGraph.","Inserts the given seen_at for txid into TxGraph.","Inserts the given transaction into TxGraph.","Inserts the given TxOut at OutPoint.","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","","","Whether the graph has any transactions or outputs in it.","","Added last-seen unix timestamps of transactions.","The last-seen unix timestamp of the transaction as …","List graph transactions that are in chain with chain_tip.","Transform the TxGraph to have Anchors of another type.","Transform the ChangeSet to have Anchors of another type.","Find missing block heights of chain.","Returns an iterator for the anchor_heights in this …","Construct a new TxGraph from a list of transactions.","","","The transactions spending from this output.","","","","","","","","","","Get the total balance of outpoints that are in chain of …","Get a filtered list of outputs from the given outpoints …","Get a filtered list of unspent outputs (UTXOs) from the …","","","","","","","","Get the position of the transaction in chain with tip …","Get the txid of the spending transaction and where the …","","","","","","","","List graph transactions that are in chain with chain_tip.","A partial or full representation of the transaction.","The transaction node (as part of the graph).","Returns known outputs of a given txid.","Iterates over the transactions spending from txid.","Txid of the transaction.","Iterates over all outpoints contained within ChangeSet.","Added txouts.","Added transactions.","","","","","","","","","","","","","","","Creates an iterator that filters and maps ancestor …","Creates an iterator that both filters and maps conflicting …","Creates an iterator that filters and maps descendants from 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that “anchors” blockchain data to a specific …","An Anchor that can be constructed from a given block, …","Trait that makes an object appendable.","Maximum BIP32 derivation index.","A reference to a block in the canonical chain.","How many confirmations are needed f or a coinbase output …","Represents a service that tracks the blockchain.","Represents the observed position of some chain data.","An Anchor implementation that also records the exact …","Block height and timestamp at which a transaction is …","An Anchor implementation that also records the exact …","The chain data is seen as confirmed, and in anchored by A.","The transaction is confirmed","A trait to extend the functionality of a miniscript …","Error type.","A TxOut with as much data as we can retrieve about it","","The error the backend returns when it fails to load …","Persist wraps a PersistBackend (B) to create a convenient …","A persistence backend for Persist.","An iterator for derived script pubkeys.","An index storing TxOuts that have a script pubkey that …","","The chain data is not confirmed and last seen in the …","The transaction is unconfirmed","The error the backend returns when it fails to write.","The script pubkeys that are being tracked by the index.","Returns the BlockId that the associated blockchain data is …","","","","The anchor block.","The anchor block.","Append another object of the same type onto self.","","","","","","","","","","","","","","","","","","","","","The position of the transaction in outpoint in the overall …","","","","","","","","","","","","","","","","","Maps a ChainPosition<&A> into a ChainPosition<A> by …","","","","","","","Commit the staged changes to the underlying persistence …","The exact confirmation height of the transaction.","The confirmation height of the transaction being anchored.","Get the upper bound of the chain data’s confirmation …","Get the upper bound of the chain data’s confirmation …","Determines the upper bound of the confirmation height.","","","The confirmation time of the transaction being anchored.","","","","","Get a reference to the internal descriptor.","","","","","Returns the minimum value (in satoshis) at which an output …","","","","","","","","","","","","","","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","","Returns the argument unchanged.","","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Construct the anchor from a given block, block height and …","","","","Get the best chain’s chain tip.","","","","","","The hash of the block.","The height of the block.","Returns the index associated with the script pubkey.","","","Contains the IndexedTxGraph and associated types. Refer to …","","Adds a script pubkey to scan for. Returns false and does …","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","","Determines whether block of BlockId exists as an ancestor …","Returns whether ChainPosition is confirmed or not.","Returns whether ConfirmationTime is the confirmed variant.","Whether the utxo is/was/will be spendable with chain tip.","Returns whether the structure is considered empty.","Whether the txout is considered mature.","Whether this output is on a coinbase transaction.","Whether any of the inputs of this transaction spend a …","","Returns whether the script pubkey at index has been used …","Module for keychain related structures.","Return the aggregate changeset C from persistence.","The LocalChain is a local implementation of ChainOracle.","Marks the script pubkey at index as used even though it …","","Computes the net value that this transaction gives to the …","Create a new Persist from PersistBackend.","Create a new script pubkey iterator from descriptor.","Create a new script pubkey iterator from descriptor and a …","","","The location of the TxOut.","Get a reference to the set of indexed outpoints.","Iterates over all the outputs with script pubkeys in an …","","","","","","","Scans a transaction’s outputs for matching script …","Scan a single TxOut for a matching script pubkey and …","Computes total input value going from script pubkeys in …","","","","","The txid and chain position of the transaction (if any) …","Returns the script that has been inserted at the index.","Stage a changeset to be committed later with commit.","Stages a new changeset and commits it (along with any …","Get the changes that have not been committed yet.","","","","","","","","","","","","","","","","","","","","","","","","","","","Module for structures that store and traverse transactions.","Returns the txout and script pubkey index of the TxOut at …","The TxOut.","Iterate over all known txouts that spend to tracked script …","Finds all txouts on a transaction that has previously been …","","","","","","","","","","Construct an unconfirmed variant using the given last_seen …","Undoes the effect of mark_used. Returns whether the index …","Iterates over all unused script pubkeys in an index range.","","","","","","","","","","Writes a changeset to the persistence backend.","Confirmation height.","The last-seen timestamp in unix seconds.","Confirmation time in unix seconds.","Represents changes to an IndexedTxGraph.","The resultant “changeset” when new transaction data is …","The IndexedTxGraph combines a TxGraph and an Indexer …","Utilities for indexing transaction data.","","Batch insert all transactions of the given block of height.","Batch insert all transactions of the given block of height…","Apply changeset to itself.","Applies the ChangeSet to the IndexedTxGraph.","Apply an update directly.","Batch insert transactions, filtering out those that are …","Batch insert unconfirmed transactions, filtering out those …","Batch insert unconfirmed transactions.","","","","","","","","","","","","","Returns the argument unchanged.","","","Returns the argument unchanged.","Get a reference of the internal transaction graph.","TxGraph changeset.","Transaction index.","Scans a transaction for relevant outpoints, which are …","Scan and index the given outpoint and txout.","Indexer changeset.","Determines the ChangeSet between self and an empty Indexer.","Determines the ChangeSet between self and an empty …","Insert an anchor for a given transaction.","Insert a unix timestamp of when a transaction is seen in …","Insert and index a transaction into the graph.","Insert a floating txout of given outpoint.","Calls U::from(self).","Calls U::from(self).","","Determines whether the transaction should be included in …","Construct a new IndexedTxGraph with a given index.","","","","","","","","","","","Balance, differentiated into various categories.","Represents updates to the derivation index of a …","KeychainTxOutIndex controls how script pubkeys are …","","Add a keychain to the tracker’s txout_index with a …","Get unbounded spk iterators for all keychains.","Append another ChangeSet into self.","Applies the derivation changeset to the KeychainTxOutIndex…","","Get the inner map of the keychain to its new derivation …","","","","","","","","","","","","","","Confirmed and immediately spendable balance","","","","","","","","","","","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","All coinbase outputs not yet matured","Returns the keychain and keychain index associated with …","","","","Return a reference to the internal SpkTxOutIndex.","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Returns whether the changeset are empty.","","Returns whether the spk under the keychain’s index has …","Iterate over all OutPoints that point to TxOuts with …","Iterate over OutPoints that point to TxOuts with script …","Return a reference to the internal map of keychain to …","Get the last derivation index revealed for keychain.","Get the last derivation index that is revealed for each …","Returns the highest derivation index of the keychain where …","Returns the highest derivation index of each keychain that …","Get the lookahead setting.","Store lookahead scripts until target_index (inclusive).","Marks the script pubkey at index as used even though the …","Computes the net value that this transaction gives to the …","Construct a KeychainTxOutIndex with the given lookahead.","Get the next derivation index for keychain. The next index …","Gets the next unused script pubkey in the keychain. I.e., …","Get a reference to the set of indexed outpoints.","Attempts to reveal the next script pubkey for keychain.","Reveals script pubkeys of the keychain’s descriptor up …","Convenience method to call Self::reveal_to_target on …","Iterate over revealed spks of the given keychain.","Iterate over revealed spks of all keychains.","Computes total input value going from script pubkeys in …","","","Return the script that exists under the given keychain’s …","","","","","Get the whole balance visible to the wallet.","Unconfirmed UTXOs generated by a wallet tx","Get sum of trusted_pending and confirmed coins.","","","","","","","Return the TxOut of outpoint if it has been indexed.","Iterate over known txouts that spend to tracked script …","Finds all txouts on a transaction that has previously been …","","","","Get an unbounded spk iterator over a given keychain.","Undoes the effect of mark_used. Returns whether the index …","Unconfirmed UTXOs received from an external wallet","Iterate over revealed, but unused, spks of the given …","Iterate over revealed, but unused, spks of all keychains.","","","","Represents a failure when trying to insert/remove a …","The error type for LocalChain::apply_header_connected_to.","Occurs when the update cannot connect with the original …","Occurs when an update does not have a common checkpoint …","The ChangeSet represents changes to LocalChain.","A LocalChain checkpoint is used to find the agreement …","Iterates over checkpoints backwards.","Occurs when connected_to block conflicts with either the …","This is a local implementation of ChainOracle.","An error which occurs when a LocalChain is constructed …","Used to update LocalChain.","Apply the given changeset.","Update the chain with a given Header connecting it with …","Update the chain with a given Header at height which you …","Applies the given update to the chain.","Get the BlockId of the checkpoint.","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","Removes blocks from (and inclusive of) the given block_id.","","","","","","","","Extends the checkpoint linked list by a iterator of block …","","","","","","","","","","","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Construct a checkpoint from a list of BlockIds in …","Constructs a LocalChain from a BTreeMap of height to …","Construct a LocalChain from an initial changeset.","Construct LocalChain from genesis hash.","Construct a checkpoint from the given header and block …","Construct a LocalChain from a given checkpoint tip.","Get the genesis hash.","Get checkpoint at height.","Get checkpoint at given height (if it exists).","","Get the block hash of the checkpoint.","Get the height of the checkpoint.","The checkpoint’s height.","Derives an initial ChangeSet, meaning that it can be …","Insert a BlockId.","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","","","Convenience method to convert the CheckPoint into an Update…","Whether the update allows for introducing older blocks.","","Iterate from this checkpoint in descending height.","Iterate over checkpoints in descending height order.","Construct a new base block at the front of a linked list.","","The original checkpoint’s block hash which cannot be …","Get the previous checkpoint in the chain","","","","","Puts another checkpoint onto the linked list representing …","Iterate checkpoints over a height range.","Iterate checkpoints over a height range.","Get the highest checkpoint.","The update chain’s new tip.","","","","","","","","","","","","","","","","","","","","The suggested checkpoint to include to connect the two …","","","","","","","","","","","","","","","","","The attempted update to the original_block hash.","","","","","","","","","Errors returned by TxGraph::calculate_fee.","A transaction that is included in the chain, or is still …","The ChangeSet represents changes to a TxGraph.","Missing TxOut for one or more of the inputs of the tx","When the transaction is invalid according to the graph it …","An iterator that traverses ancestors of a given root …","An iterator that traverses transaction descendants.","A graph of transactions and spends.","A transaction node in the TxGraph.","Get all transaction anchors known by TxGraph.","Iterate over all tx outputs known by TxGraph.","Iterates over the heights of that the new transaction …","The blocks that the transaction is “anchored” in.","Added anchors.","","Applies ChangeSet to TxGraph.","Extends this graph with another so that self becomes the …","","Get the total balance of outpoints that are in chain of …","Batch insert unconfirmed transactions.","","","","","","","","","","","","","","","Calculates the fee of a given transaction. Returns 0 if tx …","How the transaction is observed as (confirmed or …","","","","","","","","","","","","","","","","","","","Given a transaction, return an iterator of txids that …","","","","","","Get a filtered list of outputs from the given outpoints …","Get a filtered list of unspent outputs (UTXOs) from the …","Iterate over floating txouts known by TxGraph.","","","","","","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Iterate over all full transactions in the graph.","Get the position of the transaction in chain with tip …","Get the txid of the spending transaction and where the …","Get a transaction by txid. This only returns Some for full …","Get a transaction node by txid. This only returns Some for …","Obtains a single tx output (if any) at the specified …","Determines the ChangeSet between self and an empty TxGraph.","Inserts the given anchor into TxGraph.","Inserts the given seen_at for txid into TxGraph.","Inserts the given transaction into TxGraph.","Inserts the given TxOut at OutPoint.","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","","","Whether the graph has any transactions or outputs in it.","","Added last-seen unix timestamps of transactions.","The last-seen unix timestamp of the transaction as …","List graph transactions that are in chain with chain_tip.","Transform the TxGraph to have Anchors of another type.","Transform the ChangeSet to have Anchors of another type.","Find missing block heights of chain.","Returns an iterator for the anchor_heights in this …","Construct a new TxGraph from a list of transactions.","","","The transactions spending from this output.","","","","","","","","","","Get the total balance of outpoints that are in chain of …","Get a filtered list of outputs from the given outpoints …","Get a filtered list of unspent outputs (UTXOs) from the …","","","","","","","","Get the position of the transaction in chain with tip …","Get the txid of the spending transaction and where the …","","","","","","","","List graph transactions that are in chain with chain_tip.","A partial or full representation of the transaction.","The transaction node (as part of the graph).","Returns known outputs of a given txid.","Iterates over the transactions spending from txid.","Txid of the transaction.","Iterates over all outpoints contained within ChangeSet.","Added txouts.","Added transactions.","","","","","","","","","","","","","","","Creates an iterator that filters and maps ancestor …","Creates an iterator that both filters and maps conflicting …","Creates an iterator that filters and maps descendants 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The …","","","Attempt to backtrack to the previously selected node’s …","The weight of the template transaction, including fixed …","","Returns the ExcessStrategy that results in the least waste.","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","This is a variation of the Branch and Bound Coin Selection …","Current excess.","Current weight of template tx + selected inputs.","","","","Additional weight if we include the drain (change) output.","This is the effective target value.","Effective value of this input candidate: …","","","","","","Returns feerate in sats/wu.","","","","","","","","","","","","","Continue down this branch and skip the inclusion branch if …","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","","","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","Returns the argument unchanged.","","","The total number of inputs; so we can calculate extra …","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Calls U::from(self).","Turns our Bnb state into an iterator.","","","Whether this WeightedValue contains at least one segwit …","","","The feerate","Additional leeway for the target value.","The minimum absolute fee. I.e., needed for RBF.","Minimum value allowed for a drain (change) output.","Creates a new Bnb.","Create a new WeightedValue that represents a single input.","","","","","","","","","","","","","","","","Absolute value sum of all selected inputs.","","Effective value sum of all selected inputs.","","Waste sum of all selected inputs.","Weight sum of all selected inputs.","","Weight of spending the drain (change) output in the future.","The feerate we should try and achieve in sats per weight …","The value we need to select. If the value is None, then …","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","Total value of the UTXO(s) that this WeightedValue …","","","","","","","","","","","","","","Total weight of including this/these UTXO(s). txin fields: …","",""],"i":[0,0,0,0,0,0,34,0,22,0,0,11,11,22,0,0,0,34,34,0,11,11,12,12,12,0,2,4,5,2,9,2,5,34,2,26,22,8,9,4,10,11,5,12,13,34,2,26,22,8,9,4,10,11,5,12,13,4,4,8,9,4,10,11,5,12,13,8,9,4,10,11,5,12,13,12,0,4,4,4,13,9,9,4,8,11,12,5,5,13,13,4,8,9,4,10,10,11,11,5,12,12,13,2,34,2,26,22,22,22,8,9,4,10,11,5,12,13,9,12,8,34,2,26,22,8,9,4,10,11,5,12,13,2,26,4,8,4,9,9,9,9,9,2,8,4,26,4,12,2,2,10,13,2,2,4,4,4,4,5,4,4,4,4,4,4,2,9,9,9,8,9,4,10,11,5,12,13,10,11,12,34,2,26,22,8,9,4,10,11,5,12,13,34,2,26,22,8,9,4,10,11,5,12,13,34,2,26,22,8,9,4,10,11,5,12,13,4,4,8,34,2,26,22,8,9,4,10,11,5,12,13,13,8,13,34],"f":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,[[[2,[1]],1],3],[4,3],[5,6],[[[2,[1]]],3],0,0,[5],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[4,7],8],0,[8,8],[9,9],[4,4],[10,10],[11,11],[5,5],[12,12],[13,13],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[12,12],14],[4,[[15,[4]]]],[4,16],[4,17],[[4,7],3],0,[9,16],0,[4,16],[[8,18],16],[[11,11],3],[[12,12],3],0,0,0,[13,18],[4,[[19,[5,10]]]],[[8,20],21],[[9,20],21],[[4,20],21],[[10,20],21],[[10,20],21],[[11,20],21],[[11,20],21],[[5,20],21],[[12,20],21],[[12,20],21],[[13,20],21],[[[2,[1]],3]],[[]],[[]],[[]],[[]],[7,22],[23,22],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[24,17],9],[12],0,[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[[2,[1]],25],[[26,[1]]]],[[]],[4,3],0,[[4,7],3],[9,18],0,0,0,0,[[4,27,1],[[2,[1]]]],[[28,17,3],8],[[27,9],4],[[[26,[[0,[1,29,30]]]]],15],0,[[12,12],[[15,[14]]]],0,0,[31],0,0,0,[[4,7],3],[4],[4,[[19,[5,10]]]],[4,6],0,[4,28],[4,7],[4,16],[4,6],[4,16],[4,17],0,0,0,0,[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[],32],[[],32],[[],32],[[],19],[[],19],[[],19],[[],19],[[],19],[[],19],[[],19],[[],19],[[],19],[[],19],[[],19],[[],19],[[],19],[[],19],[[],19],[[],19],[[],19],[[],19],[[],19],[[],19],[[],19],[[],19],[[],19],[[],19],[[],33],[[],33],[[],33],[[],33],[[],33],[[],33],[[],33],[[],33],[[],33],[[],33],[[],33],[[],33],[4,6],[4,6],0,[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],[[]],0,0,0,[34,3]],"p":[[8,"Ord"],[3,"Bnb"],[15,"bool"],[3,"CoinSelector"],[3,"Selection"],[8,"Iterator"],[15,"usize"],[3,"WeightedValue"],[3,"CoinSelectorOpt"],[3,"SelectionError"],[4,"SelectionConstraint"],[4,"ExcessStrategyKind"],[3,"ExcessStrategy"],[4,"Ordering"],[4,"Option"],[15,"i64"],[15,"u32"],[15,"f32"],[4,"Result"],[3,"Formatter"],[6,"Result"],[4,"BnbLimit"],[3,"Duration"],[3,"TxOut"],[6,"DecideStrategy"],[3,"BnbIter"],[3,"Vec"],[15,"u64"],[8,"Copy"],[8,"Display"],[3,"Demand"],[3,"String"],[3,"TypeId"],[4,"BranchStrategy"]]},\
 "bdk_electrum":{"doc":"This crate is used for updating structures of bdk_chain …","t":[8,3,3,2,11,11,11,11,12,11,11,11,2,11,11,11,11,10,11,11,11,11,11,12,10,11,11,11,11,11,11,11,11,11],"n":["ElectrumExt","ElectrumUpdate","RelevantTxids","bdk_chain","borrow","borrow","borrow_mut","borrow_mut","chain_update","clone","clone_into","default","electrum_client","fmt","fmt","from","from","full_scan","into","into","into_confirmation_time_tx_graph","into_tx_graph","missing_full_txs","relevant_txids","sync","to_owned","try_from","try_from","try_into","try_into","type_id","type_id","vzip","vzip"],"q":["bdk_electrum","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","",""],"d":["Trait to extend Client functionality.","Combination of chain and transactions updates from electrum","Represents updates fetched from an Electrum server, but …","","","","","","Chain update","","","","","","","Returns the argument unchanged.","Returns the argument unchanged.","Full scan the keychain scripts specified with the …","Calls U::from(self).","Calls U::from(self).","Finalizes the update by fetching missing txids from the …","Finalizes the TxGraph update by fetching missing txids …","Determine the full transactions that are missing from graph…","Transaction updates from electrum","Sync a set of scripts with the blockchain (via an Electrum …","","","","","","","","",""],"i":[0,0,0,0,1,4,1,4,4,1,1,1,0,1,4,1,4,22,1,4,1,1,1,4,22,1,1,4,1,4,1,4,1,4],"f":[0,0,0,0,[[]],[[]],[[]],[[]],0,[1,1],[[]],[[],1],0,[[1,2],3],[[4,2],3],[[]],[[]],[[5,[9,[[0,[6,7]],8]],10,10],[[12,[11]]]],[[]],[[]],[[1,13,[15,[14]],[17,[16]]],[[12,[[19,[18]],11]]]],[[1,13,[15,[14]],[17,[16]]],[[12,[[19,[20]],11]]]],[[1,19],[[17,[16]]]],0,[[5,8,8,8,10],[[12,[4,11]]]],[[]],[[],12],[[],12],[[],12],[[],12],[[],21],[[],21],[[]],[[]]],"p":[[3,"RelevantTxids"],[3,"Formatter"],[6,"Result"],[3,"ElectrumUpdate"],[3,"CheckPoint"],[8,"Ord"],[8,"Clone"],[8,"IntoIterator"],[3,"BTreeMap"],[15,"usize"],[4,"Error"],[4,"Result"],[3,"Client"],[15,"u64"],[4,"Option"],[3,"Txid"],[3,"Vec"],[3,"ConfirmationTimeHeightAnchor"],[3,"TxGraph"],[3,"ConfirmationHeightAnchor"],[3,"TypeId"],[8,"ElectrumExt"]]},\
 "bdk_esplora":{"doc":"BDK Esplora","t":[8,8,2,10,10,10,10,10,10],"n":["EsploraAsyncExt","EsploraExt","esplora_client","full_scan","full_scan","sync","sync","update_local_chain","update_local_chain"],"q":["bdk_esplora","","","","","","","",""],"d":["Trait to extend the functionality of …","Trait to extend the functionality of …","","Full scan the keychain scripts specified with the …","Full scan the keychain scripts specified with the …","Sync a set of scripts with the blockchain (via an Esplora …","Sync a set of scripts with the blockchain (via an Esplora …","Prepare a LocalChain update with blocks fetched from …","Prepare a LocalChain update with blocks fetched from …"],"i":[0,0,0,16,17,16,17,16,17],"f":[0,0,0,[[[4,[[0,[1,2]],3]],5,5],[[8,[[7,[6]]]]]],[[[4,[[0,[3,9]]]],5,5],[[11,[[7,[10]]]]]],[[3,3,3,5],[[8,[[13,[12]],[7,[6]]]]]],[[[0,[3,9]],[0,[3,9]],[0,[3,9]],5],[[11,[[7,[10]]]]]],[[14,3],[[8,[15,[7,[6]]]]]],[[14,[0,[3,9]]],[[11,[[7,[10]]]]]]],"p":[[8,"Ord"],[8,"Clone"],[8,"IntoIterator"],[3,"BTreeMap"],[15,"usize"],[4,"Error"],[3,"Box"],[4,"Result"],[8,"Send"],[8,"Future"],[3,"Pin"],[3,"ConfirmationTimeHeightAnchor"],[3,"TxGraph"],[3,"CheckPoint"],[3,"Update"],[8,"EsploraExt"],[8,"EsploraAsyncExt"]]},\
diff --git a/docs-rs/bdk/nightly/latest/settings.html b/docs-rs/bdk/nightly/latest/settings.html
index 9cff0c494d..aaac72d2fe 100644
--- a/docs-rs/bdk/nightly/latest/settings.html
+++ b/docs-rs/bdk/nightly/latest/settings.html
@@ -1,2 +1 @@
-Rustdoc settings
    Rustdoc settings
    Back
    
\ No newline at end of file
+Rustdoc settings
    Rustdoc settings
    Back
    
\ No newline at end of file
diff --git a/docs-rs/bdk/nightly/latest/src/bdk/wallet/mod.rs.html b/docs-rs/bdk/nightly/latest/src/bdk/wallet/mod.rs.html
index 31bdad4208..6f92d8c199 100644
--- a/docs-rs/bdk/nightly/latest/src/bdk/wallet/mod.rs.html
+++ b/docs-rs/bdk/nightly/latest/src/bdk/wallet/mod.rs.html
@@ -2620,10 +2620,6 @@
 2619
 2620
 2621
-2622
-2623
-2624
-2625
 
    // Bitcoin Dev Kit
 // Written in 2020 by Alekos Filini <alekos.filini@gmail.com>
 //
@@ -3753,18 +3749,14 @@
                 // anchor tx to checkpoint with lowest height that is >= position's height
                 let anchor = self
                     .chain
-                    .blocks()
                     .range(height..)
-                    .next()
+                    .last()
                     .ok_or(InsertTxError::ConfirmationHeightCannotBeGreaterThanTip {
                         tip_height: self.chain.tip().height(),
                         tx_height: height,
                     })
-                    .map(|(&anchor_height, &hash)| ConfirmationTimeHeightAnchor {
-                        anchor_block: BlockId {
-                            height: anchor_height,
-                            hash,
-                        },
+                    .map(|anchor_cp| ConfirmationTimeHeightAnchor {
+                        anchor_block: anchor_cp.block_id(),
                         confirmation_height: height,
                         confirmation_time: time,
                     })?;
diff --git a/docs-rs/bdk/nightly/latest/src/bdk_chain/local_chain.rs.html b/docs-rs/bdk/nightly/latest/src/bdk_chain/local_chain.rs.html
index 39a79ed80d..cecedc34a6 100644
--- a/docs-rs/bdk/nightly/latest/src/bdk_chain/local_chain.rs.html
+++ b/docs-rs/bdk/nightly/latest/src/bdk_chain/local_chain.rs.html
@@ -797,9 +797,47 @@
 797
 798
 799
+800
+801
+802
+803
+804
+805
+806
+807
+808
+809
+810
+811
+812
+813
+814
+815
+816
+817
+818
+819
+820
+821
+822
+823
+824
+825
+826
+827
+828
+829
+830
+831
+832
+833
+834
+835
+836
 
    //! The [`LocalChain`] is a local implementation of [`ChainOracle`].
 
 use core::convert::Infallible;
+use core::ops::RangeBounds;
 
 use crate::collections::BTreeMap;
 use crate::{BlockId, ChainOracle};
@@ -833,6 +871,14 @@
     prev: Option<Arc<CPInner>>,
 }
 
+impl PartialEq for CheckPoint {
+    fn eq(&self, other: &Self) -> bool {
+        let self_cps = self.iter().map(|cp| cp.block_id());
+        let other_cps = other.iter().map(|cp| cp.block_id());
+        self_cps.eq(other_cps)
+    }
+}
+
 impl CheckPoint {
     /// Construct a new base block at the front of a linked list.
     pub fn new(block: BlockId) -> Self {
@@ -947,6 +993,36 @@
     pub fn iter(&self) -> CheckPointIter {
         self.clone().into_iter()
     }
+
+    /// Get checkpoint at `height`.
+    ///
+    /// Returns `None` if checkpoint at `height` does not exist`.
+    pub fn get(&self, height: u32) -> Option<Self> {
+        self.range(height..=height).next()
+    }
+
+    /// Iterate checkpoints over a height range.
+    ///
+    /// Note that we always iterate checkpoints in reverse height order (iteration starts at tip
+    /// height).
+    pub fn range<R>(&self, range: R) -> impl Iterator<Item = CheckPoint>
+    where
+        R: RangeBounds<u32>,
+    {
+        let start_bound = range.start_bound().cloned();
+        let end_bound = range.end_bound().cloned();
+        self.iter()
+            .skip_while(move |cp| match end_bound {
+                core::ops::Bound::Included(inc_bound) => cp.height() > inc_bound,
+                core::ops::Bound::Excluded(exc_bound) => cp.height() >= exc_bound,
+                core::ops::Bound::Unbounded => false,
+            })
+            .take_while(move |cp| match start_bound {
+                core::ops::Bound::Included(inc_bound) => cp.height() >= inc_bound,
+                core::ops::Bound::Excluded(exc_bound) => cp.height() > exc_bound,
+                core::ops::Bound::Unbounded => true,
+            })
+    }
 }
 
 /// Iterates over checkpoints backwards.
@@ -987,7 +1063,7 @@
 /// Script-pubkey based syncing mechanisms may not introduce transactions in a chronological order
 /// so some updates require introducing older blocks (to anchor older transactions). For
 /// script-pubkey based syncing, `introduce_older_blocks` would typically be `true`.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq)]
 pub struct Update {
     /// The update chain's new tip.
     pub tip: CheckPoint,
@@ -1001,22 +1077,9 @@
 }
 
 /// This is a local implementation of [`ChainOracle`].
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq)]
 pub struct LocalChain {
     tip: CheckPoint,
-    index: BTreeMap<u32, BlockHash>,
-}
-
-impl PartialEq for LocalChain {
-    fn eq(&self, other: &Self) -> bool {
-        self.index == other.index
-    }
-}
-
-impl From<LocalChain> for BTreeMap<u32, BlockHash> {
-    fn from(value: LocalChain) -> Self {
-        value.index
-    }
 }
 
 impl ChainOracle for LocalChain {
@@ -1027,18 +1090,16 @@
         block: BlockId,
         chain_tip: BlockId,
     ) -> Result<Option<bool>, Self::Error> {
-        if block.height > chain_tip.height {
-            return Ok(None);
+        let chain_tip_cp = match self.tip.get(chain_tip.height) {
+            // we can only determine whether `block` is in chain of `chain_tip` if `chain_tip` can
+            // be identified in chain
+            Some(cp) if cp.hash() == chain_tip.hash => cp,
+            _ => return Ok(None),
+        };
+        match chain_tip_cp.get(block.height) {
+            Some(cp) => Ok(Some(cp.hash() == block.hash)),
+            None => Ok(None),
         }
-        Ok(
-            match (
-                self.index.get(&block.height),
-                self.index.get(&chain_tip.height),
-            ) {
-                (Some(cp), Some(tip_cp)) => Some(*cp == block.hash && *tip_cp == chain_tip.hash),
-                _ => None,
-            },
-        )
     }
 
     fn get_chain_tip(&self) -> Result<BlockId, Self::Error> {
@@ -1049,7 +1110,7 @@
 impl LocalChain {
     /// Get the genesis hash.
     pub fn genesis_hash(&self) -> BlockHash {
-        self.index.get(&0).copied().expect("must have genesis hash")
+        self.tip.get(0).expect("genesis must exist").hash()
     }
 
     /// Construct [`LocalChain`] from genesis `hash`.
@@ -1058,7 +1119,6 @@
         let height = 0;
         let chain = Self {
             tip: CheckPoint::new(BlockId { height, hash }),
-            index: core::iter::once((height, hash)).collect(),
         };
         let changeset = chain.initial_changeset();
         (chain, changeset)
@@ -1075,7 +1135,6 @@
         let (mut chain, _) = Self::from_genesis_hash(genesis_hash);
         chain.apply_changeset(&changeset)?;
 
-        debug_assert!(chain._check_index_is_consistent_with_tip());
         debug_assert!(chain._check_changeset_is_applied(&changeset));
 
         Ok(chain)
@@ -1083,18 +1142,11 @@
 
     /// Construct a [`LocalChain`] from a given `checkpoint` tip.
     pub fn from_tip(tip: CheckPoint) -> Result<Self, MissingGenesisError> {
-        let mut chain = Self {
-            tip,
-            index: BTreeMap::new(),
-        };
-        chain.reindex(0);
-
-        if chain.index.get(&0).copied().is_none() {
+        let genesis_cp = tip.iter().last().expect("must have at least one element");
+        if genesis_cp.height() != 0 {
             return Err(MissingGenesisError);
         }
-
-        debug_assert!(chain._check_index_is_consistent_with_tip());
-        Ok(chain)
+        Ok(Self { tip })
     }
 
     /// Constructs a [`LocalChain`] from a [`BTreeMap`] of height to [`BlockHash`].
@@ -1102,12 +1154,11 @@
     /// The [`BTreeMap`] enforces the height order. However, the caller must ensure the blocks are
     /// all of the same chain.
     pub fn from_blocks(blocks: BTreeMap<u32, BlockHash>) -> Result<Self, MissingGenesisError> {
-        if !blocks.contains_key(&0) {
+        if blocks.get(&0).is_none() {
             return Err(MissingGenesisError);
         }
 
         let mut tip: Option<CheckPoint> = None;
-
         for block in &blocks {
             match tip {
                 Some(curr) => {
@@ -1120,13 +1171,9 @@
             }
         }
 
-        let chain = Self {
-            index: blocks,
+        Ok(Self {
             tip: tip.expect("already checked to have genesis"),
-        };
-
-        debug_assert!(chain._check_index_is_consistent_with_tip());
-        Ok(chain)
+        })
     }
 
     /// Get the highest checkpoint.
@@ -1293,9 +1340,7 @@
                 None => LocalChain::from_blocks(extension)?.tip(),
             };
             self.tip = new_tip;
-            self.reindex(start_height);
 
-            debug_assert!(self._check_index_is_consistent_with_tip());
             debug_assert!(self._check_changeset_is_applied(changeset));
         }
 
@@ -1308,16 +1353,16 @@
     ///
     /// Replacing the block hash of an existing checkpoint will result in an error.
     pub fn insert_block(&mut self, block_id: BlockId) -> Result<ChangeSet, AlterCheckPointError> {
-        if let Some(&original_hash) = self.index.get(&block_id.height) {
+        if let Some(original_cp) = self.tip.get(block_id.height) {
+            let original_hash = original_cp.hash();
             if original_hash != block_id.hash {
                 return Err(AlterCheckPointError {
                     height: block_id.height,
                     original_hash,
                     update_hash: Some(block_id.hash),
                 });
-            } else {
-                return Ok(ChangeSet::default());
             }
+            return Ok(ChangeSet::default());
         }
 
         let mut changeset = ChangeSet::default();
@@ -1341,33 +1386,41 @@
     /// This will fail with [`MissingGenesisError`] if the caller attempts to disconnect from the
     /// genesis block.
     pub fn disconnect_from(&mut self, block_id: BlockId) -> Result<ChangeSet, MissingGenesisError> {
-        if self.index.get(&block_id.height) != Some(&block_id.hash) {
-            return Ok(ChangeSet::default());
-        }
-
-        let changeset = self
-            .index
-            .range(block_id.height..)
-            .map(|(&height, _)| (height, None))
-            .collect::<ChangeSet>();
-        self.apply_changeset(&changeset).map(|_| changeset)
-    }
-
-    /// Reindex the heights in the chain from (and including) `from` height
-    fn reindex(&mut self, from: u32) {
-        let _ = self.index.split_off(&from);
-        for cp in self.iter_checkpoints() {
-            if cp.height() < from {
+        let mut remove_from = Option::<CheckPoint>::None;
+        let mut changeset = ChangeSet::default();
+        for cp in self.tip().iter() {
+            let cp_id = cp.block_id();
+            if cp_id.height < block_id.height {
                 break;
             }
-            self.index.insert(cp.height(), cp.hash());
+            changeset.insert(cp_id.height, None);
+            if cp_id == block_id {
+                remove_from = Some(cp);
+            }
         }
+        self.tip = match remove_from.map(|cp| cp.prev()) {
+            // The checkpoint below the earliest checkpoint to remove will be the new tip.
+            Some(Some(new_tip)) => new_tip,
+            // If there is no checkpoint below the earliest checkpoint to remove, it means the
+            // "earliest checkpoint to remove" is the genesis block. We disallow removing the
+            // genesis block.
+            Some(None) => return Err(MissingGenesisError),
+            // If there is nothing to remove, we return an empty changeset.
+            None => return Ok(ChangeSet::default()),
+        };
+        Ok(changeset)
     }
 
     /// Derives an initial [`ChangeSet`], meaning that it can be applied to an empty chain to
     /// recover the current chain.
     pub fn initial_changeset(&self) -> ChangeSet {
-        self.index.iter().map(|(k, v)| (*k, Some(*v))).collect()
+        self.tip
+            .iter()
+            .map(|cp| {
+                let block_id = cp.block_id();
+                (block_id.height, Some(block_id.hash))
+            })
+            .collect()
     }
 
     /// Iterate over checkpoints in descending height order.
@@ -1377,28 +1430,49 @@
         }
     }
 
-    /// Get a reference to the internal index mapping the height to block hash.
-    pub fn blocks(&self) -> &BTreeMap<u32, BlockHash> {
-        &self.index
-    }
-
-    fn _check_index_is_consistent_with_tip(&self) -> bool {
-        let tip_history = self
-            .tip
-            .iter()
-            .map(|cp| (cp.height(), cp.hash()))
-            .collect::<BTreeMap<_, _>>();
-        self.index == tip_history
-    }
-
     fn _check_changeset_is_applied(&self, changeset: &ChangeSet) -> bool {
-        for (height, exp_hash) in changeset {
-            if self.index.get(height) != exp_hash.as_ref() {
-                return false;
+        let mut curr_cp = self.tip.clone();
+        for (height, exp_hash) in changeset.iter().rev() {
+            match curr_cp.get(*height) {
+                Some(query_cp) => {
+                    if query_cp.height() != *height || Some(query_cp.hash()) != *exp_hash {
+                        return false;
+                    }
+                    curr_cp = query_cp;
+                }
+                None => {
+                    if exp_hash.is_some() {
+                        return false;
+                    }
+                }
             }
         }
         true
     }
+
+    /// Get checkpoint at given `height` (if it exists).
+    ///
+    /// This is a shorthand for calling [`CheckPoint::get`] on the [`tip`].
+    ///
+    /// [`tip`]: LocalChain::tip
+    pub fn get(&self, height: u32) -> Option<CheckPoint> {
+        self.tip.get(height)
+    }
+
+    /// Iterate checkpoints over a height range.
+    ///
+    /// Note that we always iterate checkpoints in reverse height order (iteration starts at tip
+    /// height).
+    ///
+    /// This is a shorthand for calling [`CheckPoint::range`] on the [`tip`].
+    ///
+    /// [`tip`]: LocalChain::tip
+    pub fn range<R>(&self, range: R) -> impl Iterator<Item = CheckPoint>
+    where
+        R: RangeBounds<u32>,
+    {
+        self.tip.range(range)
+    }
 }
 
 /// An error which occurs when a [`LocalChain`] is constructed without a genesis checkpoint.
diff --git a/docs-rs/bdk/nightly/latest/src/bdk_chain/tx_graph.rs.html b/docs-rs/bdk/nightly/latest/src/bdk_chain/tx_graph.rs.html
index e3d53df92f..a663b098d2 100644
--- a/docs-rs/bdk/nightly/latest/src/bdk_chain/tx_graph.rs.html
+++ b/docs-rs/bdk/nightly/latest/src/bdk_chain/tx_graph.rs.html
@@ -2321,13 +2321,13 @@
                     };
                     let mut has_missing_height = false;
                     for anchor_block in tx_anchors.iter().map(Anchor::anchor_block) {
-                        match chain.blocks().get(&anchor_block.height) {
+                        match chain.get(anchor_block.height) {
                             None => {
                                 has_missing_height = true;
                                 continue;
                             }
-                            Some(chain_hash) => {
-                                if chain_hash == &anchor_block.hash {
+                            Some(chain_cp) => {
+                                if chain_cp.hash() == anchor_block.hash {
                                     return true;
                                 }
                             }
@@ -2345,7 +2345,7 @@
             .filter_map(move |(a, _)| {
                 let anchor_block = a.anchor_block();
                 if Some(anchor_block.height) != last_height_emitted
-                    && !chain.blocks().contains_key(&anchor_block.height)
+                    && chain.get(anchor_block.height).is_none()
                 {
                     last_height_emitted = Some(anchor_block.height);
                     Some(anchor_block.height)
@@ -2895,7 +2895,7 @@
         A: Anchor,
     {
         self.anchor_heights()
-            .filter(move |height| !local_chain.blocks().contains_key(height))
+            .filter(move |&height| local_chain.get(height).is_none())
     }
 }
 
diff --git a/examples/index.html b/examples/index.html
index 9335cf599d..7c287af7f5 100644
--- a/examples/index.html
+++ b/examples/index.html
@@ -29,7 +29,7 @@
     
     
     
-    
+    
     
   
   
@@ -53,7 +53,7 @@
   Blog
    GitHub - (opens new window)

    # Examples

    Click the links below and learn from community-built example projects.

    # BDK-CLI (opens new window)

    A command line interface to experiment with the bitcoindevkit.

    # DevkitWallet (opens new window)

    A demo app for the bitcoindevkit on Android using bdk-kotlin.

    # Padawan Wallet (opens new window)

    A testnet-only bitcoin wallet full of tutorials on how to use bitcoin wallets.

    # BDKSwiftExampleWallet (opens new window)

    An example iOS app using bdk-swift.

    # Tatooine (opens new window)

    Tatooine is a small bitcoin testnet faucet built with Ktor, a Kotlin asynchronous framework for creating microservices and web applications.

    # SEBA Bank Proof of reserves (opens new window)

    The bdk library aims to be the core building block for Bitcoin wallets of any kind. The bdk-reserves library provides an implementation of proof-of-reserves for bdk.

    # Stackmate (opens new window)

    A multi-purpose Bitcoin Wallet.

    # Spotbit (opens new window)

    Spotbit's purpose is to allow users to access price feeds in a customisable way that preserves privacy and mitigate the reliance on a single source of data.

    + (opens new window)

    # Examples

    Click the links below and learn from community-built example projects.

    # BDK-CLI (opens new window)

    A command line interface to experiment with the bitcoindevkit.

    # DevkitWallet (opens new window)

    A demo app for the bitcoindevkit on Android using bdk-kotlin.

    # Padawan Wallet (opens new window)

    A testnet-only bitcoin wallet full of tutorials on how to use bitcoin wallets.

    # BDKSwiftExampleWallet (opens new window)

    An example iOS app using bdk-swift.

    # Tatooine (opens new window)

    Tatooine is a small bitcoin testnet faucet built with Ktor, a Kotlin asynchronous framework for creating microservices and web applications.

    # SEBA Bank Proof of reserves (opens new window)

    The bdk library aims to be the core building block for Bitcoin wallets of any kind. The bdk-reserves library provides an implementation of proof-of-reserves for bdk.

    # Stackmate (opens new window)

    A multi-purpose Bitcoin Wallet.

    # Spotbit (opens new window)

    Spotbit's purpose is to allow users to access price feeds in a customisable way that preserves privacy and mitigate the reliance on a single source of data.

    ←

    Copyright © 2024 BDK Developers

    - + diff --git a/foundation/index.html b/foundation/index.html index 2a223b108b..9466b9b20f 100644 --- a/foundation/index.html +++ b/foundation/index.html @@ -29,7 +29,7 @@ - + @@ -74,6 +74,6 @@

    Copyright © 2024 BDK Developers

    - + diff --git a/getting-started/index.html b/getting-started/index.html index b0aa7ef8c3..3f333c98a4 100644 --- a/getting-started/index.html +++ b/getting-started/index.html @@ -31,7 +31,7 @@ - + @@ -105,7 +105,7 @@ wallet.get_descriptor_for_keychain(KeychainKind::External).to_string(), wallet.get_descriptor_for_keychain(KeychainKind::Internal).to_string()); } -

    More information about each component used in the code can be found in BDK Documentation (opens new window).

    +

    More information about each component used in the code can be found in BDK Documentation (opens new window).

    Introduction → @@ -130,6 +130,6 @@

    Copyright © 2024 BDK Developers

    - + diff --git a/index.html b/index.html index 7e990eb8ec..d2e09bb6f9 100644 --- a/index.html +++ b/index.html @@ -29,7 +29,7 @@ - + @@ -80,6 +80,6 @@

    Copyright © 2024 BDK Developers

    - + diff --git a/sitemap.xml b/sitemap.xml index 1995ec824a..6940676343 100644 --- a/sitemap.xml +++ b/sitemap.xml @@ -1 +1 @@ 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\ No newline at end of file diff --git a/supporters/index.html b/supporters/index.html index 768458da55..163983fec6 100644 --- a/supporters/index.html +++ b/supporters/index.html @@ -29,7 +29,7 @@ - + @@ -63,7 +63,7 @@ Brink Sponsor Kraken Kraken -