diff --git a/404.html b/404.html index 7a0c91fdf9..4be45b46de 100644 --- a/404.html +++ b/404.html @@ -15,7 +15,7 @@ - + @@ -39,7 +39,7 @@ Blog GitHub - (opens new window)

404 - Not Found

That's a Four-Oh-Four.
+ (opens new window)

404 - Not Found

How did we get here?
Take me home.
- + diff --git a/assets/js/19.18ad1143.js b/assets/js/19.cd75d4ee.js similarity index 99% rename from assets/js/19.18ad1143.js rename to assets/js/19.cd75d4ee.js index f2fed08dc7..bd758b15f0 100644 --- a/assets/js/19.18ad1143.js +++ b/assets/js/19.cd75d4ee.js @@ -1 +1 @@ -(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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decoration"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("const")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("InputDecoration")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n hintText"),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('"Enter your mnemonic"')])]),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("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("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("/* Send Transaction Buttons */")]),t._v("\n\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("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("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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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(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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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 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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 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"),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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')]),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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res"),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(";")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),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 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("syncWallet")]),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 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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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("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\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:"25%"},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-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],{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. 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(347)}}),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. 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. This will probably crash the app but that's fine, it will be up and running once we add code to "),a("code",[t._v("home.dart")]),t._v(" in the next few steps")]),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("// main.dart")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string-literal"}},[a("span",{pre:!0,attrs:{class:"token string"}},[t._v("'package:bdk_flutter_quickstart/screens/home.dart'")])]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string-literal"}},[a("span",{pre:!0,attrs:{class:"token string"}},[t._v("'package:bdk_flutter_quickstart/styles/theme.dart'")])]),a("span",{pre:!0,attrs:{class:"token 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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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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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"),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(" mnemonicObj "),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("Mnemonic")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("fromString")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("mnemonic"),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(" descriptorSecretKey "),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(" 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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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operator"}},[t._v("=")]),t._v(" res"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n displayText "),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('"Wallet Created: ')]),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("address")])]),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 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(" "),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("e"),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 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("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("A new button will be required to call "),a("code",[t._v("createOrRestoreWallet()")])]),t._v(" "),a("p",[t._v("Let's add a new button just below the mnemonic "),a("code",[t._v("TextFieldContainer")])]),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("SubmitButton")]),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('"Create 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 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("createOrRestoreWallet")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n mnemonic"),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(" \n "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Network.Testnet")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token string-literal"}},[a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"password"')])]),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("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(353)}}),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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"),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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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. 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.cbf92012.js b/assets/js/21.2f91e464.js similarity index 98% rename from assets/js/21.cbf92012.js rename to assets/js/21.2f91e464.js index d334349d43..16f2896643 100644 --- a/assets/js/21.cbf92012.js +++ b/assets/js/21.2f91e464.js @@ -1 +1 @@ -(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"},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-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. 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To achieve this add the following code.")]),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("// screens/home.js")]),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 keyword"}},[t._v("const")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("displayText"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" setDisplayText"),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 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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("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 punctuation"}},[t._v(";")]),t._v("\n")])])]),a("p",[t._v("Now we need some "),a("code",[t._v("jsx")]),t._v(" code to display the balance.")]),t._v(" "),a("p",[t._v("Just below "),a("code",[t._v("{/* Balance */}")]),t._v(" and above "),a("code",[t._v("{*/ method call 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 tertiary operator for a quick check.")]),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 punctuation"}},[t._v("{")]),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("/* Balance */")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\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 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 script-punctuation punctuation"}},[t._v("=")]),a("span",{pre:!0,attrs:{class:"token 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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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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("createWallet"),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("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("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("p",[t._v("The response returned by "),a("code",[t._v("createWallet")]),t._v(" is a new address for the created wallet.")]),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 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 script-punctuation punctuation"}},[t._v("=")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("getBalance"),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("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("And two click handlers below createWallet:")]),t._v(" "),a("div",{staticClass:"language-javascript extra-class"},[a("pre",{pre:!0,attrs:{class:"language-javascript"}},[a("code",[t._v("\n "),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("syncWallet")]),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(" 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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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punctuation"}},[t._v("{")]),t._v("getAddress"),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("We should now have the following, and Get Address will be able to display a new address.")]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0px auto",zoom:"50%"},attrs:{src:s(354)}}),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-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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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 +(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"},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-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(358),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(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. The image assets, "),a("code",[t._v("Button.tsx")]),t._v(" and "),a("code",[t._v("styles.js")]),t._v(" can be taken from "),a("a",{attrs:{href:"https://github.com/LtbLightning/BdkRnQuickStart/tree/master/src",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),a("OutboundLink")],1),t._v(" and moved to the folders as shown. Alternatively, you can write your own styles and use your own images if you intend to style the app in a different way.")]),t._v(" "),a("p",[t._v("Create a "),a("code",[t._v("home.js")]),t._v(" file under "),a("code",[t._v("screens")]),t._v(" folder, this will be where we will be adding most of the code.")]),t._v(" "),a("p",[t._v("Once done the project structure should look like this:")]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0px auto",zoom:"67%"},attrs:{src:s(360)}}),t._v(" "),a("p",[t._v("Locate "),a("code",[t._v("App.js")]),t._v(" in the project root, this will have the default code added by "),a("code",[t._v("react-native init")]),t._v(", let's delete all contents of "),a("code",[t._v("App.js")]),t._v(" and replace it with code to import "),a("code",[t._v("home.js")]),t._v(" as our main screen.")]),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 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fine, it will be fixed in the next step.")]),t._v(" "),a("h2",{attrs:{id:"installing-bdk-rn"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#installing-bdk-rn"}},[t._v("#")]),t._v(" Installing "),a("code",[t._v("bdk-rn")])]),t._v(" "),a("p",[t._v("With the RN app project in place, we can now add "),a("code",[t._v("bdk-rn")]),t._v(" using either npm or yarn.")]),t._v(" "),a("p",[t._v("Using npm:")]),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 function"}},[t._v("npm")]),t._v(" i "),a("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--save")]),t._v(" bdk-rn\n")])])]),a("p",[t._v("Using yarn:")]),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 function"}},[t._v("yarn")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("add")]),t._v(" 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We will also need a button which will invoke generateMnemonic when clicked. 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To achieve this add the following code.")]),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("// screens/home.js")]),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 keyword"}},[t._v("const")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("displayText"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" setDisplayText"),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 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*/}")])]),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 comment"}},[t._v("// screens/home.js")]),t._v("\n\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("/* method call result */")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\t"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// display the component only if displayText has a value")]),t._v("\n\t"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("displayText "),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 tag"}},[a("span",{pre:!0,attrs:{class:"token tag"}},[a("span",{pre:!0,attrs:{class:"token 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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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We only want to show the balance when it has a value so we will use a tertiary operator for a quick check.")]),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 punctuation"}},[t._v("{")]),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("/* Balance */")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\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 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 script-punctuation punctuation"}},[t._v("=")]),a("span",{pre:!0,attrs:{class:"token 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"),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 script-punctuation punctuation"}},[t._v("=")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("getBalance"),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("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("And two click handlers below createWallet:")]),t._v(" "),a("div",{staticClass:"language-javascript extra-class"},[a("pre",{pre:!0,attrs:{class:"language-javascript"}},[a("code",[t._v("\n "),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("syncWallet")]),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(" 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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\n")])])]),a("p",[t._v("We should now be able to create a wallet, sync UTXOs and get balance")]),t._v(" "),a("img",{staticStyle:{display:"block",margin:"0 auto",zoom:"50%"},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 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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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 diff --git a/assets/js/31.2e09623a.js b/assets/js/31.c8bce6b9.js similarity index 99% rename from assets/js/31.2e09623a.js rename to assets/js/31.c8bce6b9.js index 940bd49eaa..542adce355 100644 --- a/assets/js/31.2e09623a.js +++ b/assets/js/31.c8bce6b9.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"},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 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("import")]),t._v(" android"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("annotation"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("SuppressLint\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" android"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("util"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("Log\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("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 punctuation"}},[t._v(".")]),t._v("bitcoindevkit"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("Wallet "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("as")]),t._v(" BdkWallet\n")])])]),e("p",[t._v("To use React Context API "),e("code",[t._v("com.facebook.react.bridge.*")]),t._v(" also needs to be imported")]),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(" 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(".")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("*")]),t._v("\n")])])]),e("p",[t._v("A new class needs to be defined here which will 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 punctuation"}},[t._v(".")]),t._v("xprv "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("+")]),t._v(' "'),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("/")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("84")]),t._v("'"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("/")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("1")]),t._v("'"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("/")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),t._v("'"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("/")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("/*)\"\n\nval changeDescriptor: String = descriptor.replace(\"/84'/1'/0'/0/*\",\"/84'/1'/0'/1/*\")\n")])])])]),e("p",[t._v("To create a wallet with bdk we need to specify wallet descriptor, network, a database config, blockchain config. 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"},389: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 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("import")]),t._v(" android"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("annotation"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("SuppressLint\n"),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" android"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("util"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("Log\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("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 punctuation"}},[t._v(".")]),t._v("bitcoindevkit"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("Wallet "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("as")]),t._v(" BdkWallet\n")])])]),e("p",[t._v("To use React Context API "),e("code",[t._v("com.facebook.react.bridge.*")]),t._v(" also needs to be imported")]),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(" 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(".")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("*")]),t._v("\n")])])]),e("p",[t._v("A new class needs to be defined here which will 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 punctuation"}},[t._v(".")]),t._v("xprv "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("+")]),t._v(' "'),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("/")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("84")]),t._v("'"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("/")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("1")]),t._v("'"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("/")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),t._v("'"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("/")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("/*)\"\n\nval changeDescriptor: String = descriptor.replace(\"/84'/1'/0'/0/*\",\"/84'/1'/0'/1/*\")\n")])])])]),e("p",[t._v("To create a wallet with bdk we need to specify wallet descriptor, network, a database config, blockchain config. 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/34.1951be7d.js b/assets/js/34.2e8ace62.js similarity index 99% rename from assets/js/34.1951be7d.js rename to assets/js/34.2e8ace62.js index 47f2cd89d8..641e4dfc68 100644 --- a/assets/js/34.1951be7d.js +++ b/assets/js/34.2e8ace62.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"},388: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(";")]),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 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(",")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("BlockchainEvent")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Disconnected")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),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(" "),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("// 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 +(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). 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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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punctuation"}},[t._v("{")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("/* get a Stream of blockchain block connected/disconnected events */")]),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 keyword"}},[t._v("loop")]),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(" blockchain_event "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" blockchain_events"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("next")]),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 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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 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(",")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("BlockchainEvent")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),e("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Disconnected")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),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(" "),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("// 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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As a consequence you will deepen your technical understanding about bitcoin and the bdk library.")])]),t._v(" "),e("li",[e("p",[t._v("BDK also has "),e("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk-ffi",target:"_blank",rel:"noopener noreferrer"}},[t._v("language-bindings"),e("OutboundLink")],1),t._v(" for "),e("strong",[t._v("Kotlin/Java, Swift, Python")]),t._v(" which enable the use of BDK's "),e("strong",[t._v("Rust")]),t._v(" library as an API. You can later use these similar steps to create your own bitcoin mobile, desktop or even WebApp by using the bdk-ffi language bindings.")])])]),t._v(" "),e("hr"),t._v(" "),e("h2",{attrs:{id:"a-few-things-before-you-begin"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#a-few-things-before-you-begin"}},[t._v("#")]),t._v(" A few things before you begin:")]),t._v(" "),e("ul",[e("li",[t._v("Three things to look out for in each step of the tutorial:\n"),e("ul",[e("li",[e("ol",[e("li",[t._v("▶️ / 🔶 - Commands for the Terminal or Shell")])])]),t._v(" "),e("li",[e("ol",{attrs:{start:"2"}},[e("li",[t._v("👍 - Preview of the command output. Note, not all commands will output code.")])])]),t._v(" "),e("li",[e("ol",{attrs:{start:"3"}},[e("li",[t._v("Preview Video of the tutorial for reference of what things should look like in action.")])])])])])]),t._v(" "),e("hr"),t._v(" "),e("h3",{attrs:{id:"outline-of-tutorial-and-installation-notes"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#outline-of-tutorial-and-installation-notes"}},[t._v("#")]),t._v(" Outline of Tutorial and Installation notes:")]),t._v(" "),e("h3",{attrs:{id:"brief-outline-of-tutorial"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#brief-outline-of-tutorial"}},[t._v("#")]),t._v(" Brief Outline of Tutorial")]),t._v(" "),e("ul",[e("li",[t._v("Step 1: Creating a mnemonic word list + XPRV (Extended Private Key)")]),t._v(" "),e("li",[t._v("Step 2: Generate testnet Receive Address")]),t._v(" "),e("li",[t._v("Step 3: Send funds to newly generated address")]),t._v(" "),e("li",[t._v("Step 4: Sync Wallet")]),t._v(" "),e("li",[t._v("Step 5: Check Balance of Wallet")]),t._v(" "),e("li",[t._v("Step 6: Create a Transaction (PSBT)")]),t._v(" "),e("li",[t._v("Step 7: Sign the Transaction (PSBT)")]),t._v(" "),e("li",[t._v("Step 8: Broadcast Transaction")])]),t._v(" "),e("hr"),t._v(" "),e("h3",{attrs:{id:"rust-and-cargo-installation"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#rust-and-cargo-installation"}},[t._v("#")]),t._v(" Rust and Cargo installation:")]),t._v(" "),e("ul",[e("li",[e("a",{attrs:{href:"https://rustup.rs/",target:"_blank",rel:"noopener noreferrer"}},[t._v("Rust and Cargo Installation"),e("OutboundLink")],1)])]),t._v(" "),e("hr"),t._v(" "),e("h3",{attrs:{id:"bdk-cli-installation"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#bdk-cli-installation"}},[t._v("#")]),t._v(" "),e("code",[t._v("bdk-cli")]),t._v(" installation:")]),t._v(" "),e("ul",[e("li",[t._v("Download the "),e("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk-cli.git",target:"_blank",rel:"noopener noreferrer"}},[e("code",[t._v("bdk-cli")]),t._v(" github repository locally"),e("OutboundLink")],1),t._v(" "),e("ul",[e("li",[t._v("Enter the folder "),e("code",[t._v("cd bdk-cli")])]),t._v(" "),e("li",[t._v("Install "),e("code",[t._v("cargo install --path . --features electrum,repl,compiler")])]),t._v(" "),e("li",[t._v("Once installation is done exit and reopen your terminal (command-line interface)")])])])]),t._v(" "),e("h3",{attrs:{id:"emoji-legend"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#emoji-legend"}},[t._v("#")]),t._v(" Emoji Legend:")]),t._v(" "),e("p",[t._v("▶️ : Unix/Linux Commands to copied and pasted\n🔶 : Windows Powershell Commands to copied and pasted\n👍 : Output/ preview of code")]),t._v(" "),e("hr"),t._v(" "),e("h2",{attrs:{id:"step-0-check-version-of-bdk-cli"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-0-check-version-of-bdk-cli"}},[t._v("#")]),t._v(" Step 0: Check Version of bdk-cli")]),t._v(" "),e("p",[t._v("▶️ / 🔶 "),e("code",[t._v("bdk-cli -V")]),t._v("\n👍 The output below confirms the command was successful.")]),t._v(" "),e("div",{staticClass:"language- extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("bdk-cli 0.6.0\n")])])]),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/IcuyeMS.gif",alt:""}})]),t._v(" "),e("h3",{attrs:{id:"preview-of-bdk-cli-help-menu"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#preview-of-bdk-cli-help-menu"}},[t._v("#")]),t._v(" Preview of bdk-cli help menu")]),t._v(" "),e("p",[t._v("▶️ / 🔶 "),e("code",[t._v("bdk-cli --help")]),e("br"),t._v("\n👍 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",[t._v("The BDK Command Line Wallet App\n\nbdk-cli is a light weight "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("command")]),t._v(" line bitcoin wallet, powered by BDK. This app can be used as a playground as well as\ntesting environment to simulate various wallet testing situations. If you are planning to use BDK "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("in")]),t._v(" your wallet, bdk-\ncli is also a great intro tool to get familiar with the BDK API.\n\nBut this is not just any toy. bdk-cli is also a fully functioning bitcoin wallet with taproot support"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n\nFor "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("more")]),t._v(" information checkout "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),t._v("https://bitcoindevkit.org/"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(">")]),t._v("\n\nUSAGE:\n bdk-cli "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("OPTIONS"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),t._v("SUBCOMMAND"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(">")]),t._v("\n\nFLAGS:\n -h, "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--help")]),t._v(" Prints "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("help")]),t._v(" information\n -V, "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--version")]),t._v(" Prints version information\n\nOPTIONS:\n -d, "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--datadir")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),t._v("DATADIR"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(">")]),t._v(" Sets the wallet data directory. Default value "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(' "~/.bdk-bitcoin\n -n, '),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--network")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),t._v("NETWORK"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(">")]),t._v(" Sets the network "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("default: testnet"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("possible values: bitcoin, testnet, signet, regtest"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v("\n\nSUBCOMMANDS:\n compile Compile a miniscript policy to an output descriptor\n "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("help")]),t._v(" Prints this message or the "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("help")]),t._v(" of the given subcommand"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("s"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n key Subcommands "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("for")]),t._v(" Key operations\n repl Options to configure a SOCKS5 proxy "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("for")]),t._v(" a blockchain client connection\n wallet Wallet subcommands that can be issued without a blockchain backend\n")])])]),e("hr"),t._v(" "),e("h2",{attrs:{id:"step-1-seed-generate"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-1-seed-generate"}},[t._v("#")]),t._v(" Step 1: Seed Generate")]),t._v(" "),e("h3",{attrs:{id:"1a-mnemonic-word-list-xprv-extended-private-key-"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#1a-mnemonic-word-list-xprv-extended-private-key-"}},[t._v("#")]),t._v(" 1a: Mnemonic word-list + XPRV (Extended Private Key) 🔑")]),t._v(" "),e("p",[t._v("Linux/Terminal:\n▶️ "),e("code",[t._v("bdk-cli key generate | tee key.json")])]),t._v(" "),e("p",[t._v("Windows Powershell:\n🔶 "),e("code",[t._v('bdk-cli key generate | Out-File -FilePath "key.json"')])]),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('"fingerprint"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"42b15d2f"')]),t._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"mnemonic"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"party salon worth satoshi envelope suggest garlic dry add pitch throw clap keen narrow antique oyster ketchup purchase gasp visual work venue fog crater"')]),t._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"xprv"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"tprv8ZgxMBicQKsPdwpamtjqMFpYRTafnE1bN2SphLEybCtRKakk6S1TgQCsZgiBwJuJNWe3jYdgVCTsKf9weMxj6tW4zNNKWptykszJpS2L8wE"')]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/ii62Hul.gif",alt:""}})]),t._v(" "),e("hr"),t._v(" "),e("h3",{attrs:{id:"1b-save-xprv-extended-private-key-into-environment-variable"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#1b-save-xprv-extended-private-key-into-environment-variable"}},[t._v("#")]),t._v(" 1b: Save XPRV (Extended Private Key) into environment variable")]),t._v(" "),e("p",[t._v("Linux/Terminal:\n▶️ "),e("code",[t._v("export XPRV_00=$(cat key.json | jq -r .xprv)")])]),t._v(" "),e("p",[t._v("Windows Powershell:")]),t._v(" "),e("p",[t._v("🔶 "),e("code",[t._v("$json = Get-Content -Path .\\key.json | ConvertFrom-Json")])]),t._v(" "),e("p",[t._v("🔶 "),e("code",[t._v("$mykeyValue = $json.xprv")])]),t._v(" "),e("p",[t._v("🔶 "),e("code",[t._v("[System.Environment]::SetEnvironmentVariable('XPRV',$mykeyValue, 'Process')")])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/KYW2Cdo.gif",alt:""}})]),t._v(" "),e("hr"),t._v(" "),e("h3",{attrs:{id:"1c-verify-environment-variable-xprv-00-is-active"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#1c-verify-environment-variable-xprv-00-is-active"}},[t._v("#")]),t._v(" 1c: Verify environment variable XPRV_00 is active")]),t._v(" "),e("p",[t._v("Linux/Terminal:\n▶️ "),e("code",[t._v("env | grep XPRV")])]),t._v(" "),e("p",[t._v("Windows Powershell:\n🔶 "),e("code",[t._v("$env:XPRV")])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/ZahbJwe.gif",alt:""}})]),t._v(" "),e("hr"),t._v(" "),e("h3",{attrs:{id:"1d-create-descriptor-and-save-into-environment-variable"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#1d-create-descriptor-and-save-into-environment-variable"}},[t._v("#")]),t._v(" 1d: Create Descriptor and Save into environment variable")]),t._v(" "),e("p",[t._v("Linux/Terminal:\n▶️ "),e("code",[t._v('export my_descriptor="wpkh($XPRV_00/84h/1h/0h/0/*)"')])]),t._v(" "),e("p",[t._v("Windows Powershell:\n🔶 "),e("code",[t._v("[System.Environment]::SetEnvironmentVariable('my_descriptor', \"wpkh($env:XPRV/84h/1h/0h/0/*)\", 'Process')")])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/UV4Vgsq.gif",alt:""}})]),t._v(" "),e("hr"),t._v(" "),e("h3",{attrs:{id:"1e-verify-environment-variable-my-descriptor-is-active"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#1e-verify-environment-variable-my-descriptor-is-active"}},[t._v("#")]),t._v(" 1e: Verify environment variable my_descriptor is active")]),t._v(" "),e("p",[t._v("Linux/Terminal:\n▶️ "),e("code",[t._v("env | grep my_descriptor")])]),t._v(" "),e("p",[t._v("Windows Powershell:\n🔶 "),e("code",[t._v("$env:my_descriptor")])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/s7ZeRQN.gif",alt:""}})]),t._v(" "),e("hr"),t._v(" "),e("h2",{attrs:{id:"step-2-generate-receive-address"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-2-generate-receive-address"}},[t._v("#")]),t._v(" Step 2: Generate Receive-Address")]),t._v(" "),e("p",[t._v("Linux/Terminal:")]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("bdk-cli wallet --wallet wallet_name --descriptor $my_descriptor get_new_address")])]),t._v(" "),e("p",[t._v("Windows Powershell:\n🔶"),e("code",[t._v("bdk-cli wallet --descriptor $env:my_descriptor get_new_address")])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/P8PjTAo.gif",alt:""}})]),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('"address"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"tb1qrh4sq5va0unqtxyfv8al9lz3sna3988cj59uya"')]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("hr"),t._v(" "),e("h2",{attrs:{id:"step-3-send-testnet-bitcoin-to-the-newly-created-receive-address"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-3-send-testnet-bitcoin-to-the-newly-created-receive-address"}},[t._v("#")]),t._v(" Step 3: Send testnet bitcoin to the newly created receive-address")]),t._v(" "),e("p",[t._v("Use a faucet to send funds to your newly created address. Here is a link to one: "),e("a",{attrs:{href:"https://bitcoinfaucet.uo1.net",target:"_blank",rel:"noopener noreferrer"}},[t._v("Bitcoin Testnet Faucet"),e("OutboundLink")],1)]),t._v(" "),e("hr"),t._v(" "),e("h2",{attrs:{id:"step-4-sync-the-wallet"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-4-sync-the-wallet"}},[t._v("#")]),t._v(" Step 4: Sync the wallet")]),t._v(" "),e("p",[t._v("Linux/Terminal:\n▶️ "),e("code",[t._v("bdk-cli wallet --wallet wallet_name --descriptor $my_descriptor sync")])]),t._v(" "),e("p",[t._v("Windows Powershell:\n🔶 "),e("code",[t._v("bdk-cli wallet --descriptor $env:my_descriptor sync")])]),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("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/WFYBgVB.gif",alt:""}})]),t._v(" "),e("hr"),t._v(" "),e("h2",{attrs:{id:"step-5-check-the-balance"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-5-check-the-balance"}},[t._v("#")]),t._v(" Step 5: Check the balance")]),t._v(" "),e("p",[t._v("Linux/Terminal:\n▶️ "),e("code",[t._v("bdk-cli wallet --wallet wallet_name --descriptor $my_descriptor get_balance")])]),t._v(" "),e("p",[t._v("Windows Powershell:\n🔶\n"),e("code",[t._v("bdk-cli wallet --descriptor $env:my_descriptor get_balance")])]),t._v(" "),e("div",{staticClass:"custom-block tip"},[e("p",{staticClass:"custom-block-title"},[t._v("TIP")]),t._v(" "),e("p",[t._v("Note: The balance will only show after the transaction has been confirmed in a block at least once.")])]),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('"satoshi"')]),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('"confirmed"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("100000")]),t._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"immature"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),t._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"trusted_pending"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),t._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"untrusted_pending"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),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("figure",[e("img",{attrs:{src:"https://i.imgur.com/v8MAYB2.gif",alt:""}})]),t._v(" "),e("hr"),t._v(" "),e("h2",{attrs:{id:"step-6-create-transaction-psbt"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-6-create-transaction-psbt"}},[t._v("#")]),t._v(" Step 6: Create Transaction (PSBT)")]),t._v(" "),e("p",[t._v("To create a PSBT (partially-signed-bitcoin-transaction) run the command:")]),t._v(" "),e("p",[t._v("Linux/Terminal:\n▶️ "),e("code",[t._v("bdk-cli wallet --wallet wallet_name --descriptor $my_descriptor 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"),e("li",[e("a",{attrs:{href:"https://bitcoin.stackexchange.com/questions/97242/bip39-tool-bip32-extended-private-key-vs-bip32-root-key",target:"_blank",rel:"noopener noreferrer"}},[t._v("Master Private Key and Extended Private Key"),e("OutboundLink")],1)]),t._v(" "),e("li",[e("a",{attrs:{href:"https://min.sc",target:"_blank",rel:"noopener noreferrer"}},[t._v("Minsc A Miniscript-based scripting language for Bitcoin contracts"),e("OutboundLink")],1)])])])}),[],!1,null,null,null);e.default=n.exports}}]); \ No newline at end of file +(window.webpackJsonp=window.webpackJsonp||[]).push([[41],{388:function(t,e,a){"use strict";a.r(e);var s=a(7),n=Object(s.a)({},(function(){var t=this,e=t._self._c;return e("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[e("h2",{attrs:{id:"tutorial-goals"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#tutorial-goals"}},[t._v("#")]),t._v(" Tutorial Goals")]),t._v(" "),e("ul",[e("li",[e("p",[t._v("The goal for this tutorial is to introduce 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This app can be used as a playground as well as\ntesting environment to simulate various wallet testing situations. If you are planning to use BDK "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("in")]),t._v(" your wallet, bdk-\ncli is also a great intro tool to get familiar with the BDK API.\n\nBut this is not just any toy. bdk-cli is also a fully functioning bitcoin wallet with taproot support"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n\nFor "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("more")]),t._v(" information checkout "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),t._v("https://bitcoindevkit.org/"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(">")]),t._v("\n\nUSAGE:\n bdk-cli "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("OPTIONS"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),t._v("SUBCOMMAND"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(">")]),t._v("\n\nFLAGS:\n -h, "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--help")]),t._v(" Prints "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("help")]),t._v(" information\n -V, "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--version")]),t._v(" Prints version information\n\nOPTIONS:\n -d, "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--datadir")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),t._v("DATADIR"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(">")]),t._v(" Sets the wallet data directory. Default value "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(' "~/.bdk-bitcoin\n -n, '),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--network")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),t._v("NETWORK"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v(">")]),t._v(" Sets the network "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("default: testnet"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("possible values: bitcoin, testnet, signet, regtest"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v("\n\nSUBCOMMANDS:\n compile Compile a miniscript policy to an output descriptor\n "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("help")]),t._v(" Prints this message or the "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("help")]),t._v(" of the given subcommand"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("s"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n key Subcommands "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("for")]),t._v(" Key operations\n repl Options to configure a SOCKS5 proxy "),e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("for")]),t._v(" a blockchain client connection\n wallet Wallet subcommands that can be issued without a blockchain backend\n")])])]),e("hr"),t._v(" "),e("h2",{attrs:{id:"step-1-seed-generate"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-1-seed-generate"}},[t._v("#")]),t._v(" Step 1: Seed Generate")]),t._v(" "),e("h3",{attrs:{id:"1a-mnemonic-word-list-xprv-extended-private-key-"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#1a-mnemonic-word-list-xprv-extended-private-key-"}},[t._v("#")]),t._v(" 1a: Mnemonic word-list + XPRV (Extended Private Key) 🔑")]),t._v(" "),e("p",[t._v("Linux/Terminal:\n▶️ "),e("code",[t._v("bdk-cli key generate | tee key.json")])]),t._v(" "),e("p",[t._v("Windows Powershell:\n🔶 "),e("code",[t._v('bdk-cli key generate | Out-File -FilePath "key.json"')])]),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('"fingerprint"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"42b15d2f"')]),t._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"mnemonic"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"party salon worth satoshi envelope suggest garlic dry add pitch throw clap keen narrow antique oyster ketchup purchase gasp visual work venue fog crater"')]),t._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"xprv"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"tprv8ZgxMBicQKsPdwpamtjqMFpYRTafnE1bN2SphLEybCtRKakk6S1TgQCsZgiBwJuJNWe3jYdgVCTsKf9weMxj6tW4zNNKWptykszJpS2L8wE"')]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/ii62Hul.gif",alt:""}})]),t._v(" "),e("hr"),t._v(" "),e("h3",{attrs:{id:"1b-save-xprv-extended-private-key-into-environment-variable"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#1b-save-xprv-extended-private-key-into-environment-variable"}},[t._v("#")]),t._v(" 1b: Save XPRV (Extended Private Key) into environment variable")]),t._v(" "),e("p",[t._v("Linux/Terminal:\n▶️ "),e("code",[t._v("export XPRV_00=$(cat key.json | jq -r .xprv)")])]),t._v(" "),e("p",[t._v("Windows Powershell:")]),t._v(" "),e("p",[t._v("🔶 "),e("code",[t._v("$json = Get-Content -Path .\\key.json | ConvertFrom-Json")])]),t._v(" "),e("p",[t._v("🔶 "),e("code",[t._v("$mykeyValue = $json.xprv")])]),t._v(" "),e("p",[t._v("🔶 "),e("code",[t._v("[System.Environment]::SetEnvironmentVariable('XPRV',$mykeyValue, 'Process')")])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/KYW2Cdo.gif",alt:""}})]),t._v(" "),e("hr"),t._v(" "),e("h3",{attrs:{id:"1c-verify-environment-variable-xprv-00-is-active"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#1c-verify-environment-variable-xprv-00-is-active"}},[t._v("#")]),t._v(" 1c: Verify environment variable XPRV_00 is active")]),t._v(" "),e("p",[t._v("Linux/Terminal:\n▶️ "),e("code",[t._v("env | grep XPRV")])]),t._v(" "),e("p",[t._v("Windows Powershell:\n🔶 "),e("code",[t._v("$env:XPRV")])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/ZahbJwe.gif",alt:""}})]),t._v(" "),e("hr"),t._v(" "),e("h3",{attrs:{id:"1d-create-descriptor-and-save-into-environment-variable"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#1d-create-descriptor-and-save-into-environment-variable"}},[t._v("#")]),t._v(" 1d: Create Descriptor and Save into environment variable")]),t._v(" "),e("p",[t._v("Linux/Terminal:\n▶️ "),e("code",[t._v('export my_descriptor="wpkh($XPRV_00/84h/1h/0h/0/*)"')])]),t._v(" "),e("p",[t._v("Windows Powershell:\n🔶 "),e("code",[t._v("[System.Environment]::SetEnvironmentVariable('my_descriptor', \"wpkh($env:XPRV/84h/1h/0h/0/*)\", 'Process')")])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/UV4Vgsq.gif",alt:""}})]),t._v(" "),e("hr"),t._v(" "),e("h3",{attrs:{id:"1e-verify-environment-variable-my-descriptor-is-active"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#1e-verify-environment-variable-my-descriptor-is-active"}},[t._v("#")]),t._v(" 1e: Verify environment variable my_descriptor is active")]),t._v(" "),e("p",[t._v("Linux/Terminal:\n▶️ "),e("code",[t._v("env | grep my_descriptor")])]),t._v(" "),e("p",[t._v("Windows Powershell:\n🔶 "),e("code",[t._v("$env:my_descriptor")])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/s7ZeRQN.gif",alt:""}})]),t._v(" "),e("hr"),t._v(" "),e("h2",{attrs:{id:"step-2-generate-receive-address"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-2-generate-receive-address"}},[t._v("#")]),t._v(" Step 2: Generate Receive-Address")]),t._v(" "),e("p",[t._v("Linux/Terminal:")]),t._v(" "),e("p",[t._v("▶️ "),e("code",[t._v("bdk-cli wallet --wallet wallet_name --descriptor $my_descriptor get_new_address")])]),t._v(" "),e("p",[t._v("Windows Powershell:\n🔶"),e("code",[t._v("bdk-cli wallet --descriptor $env:my_descriptor get_new_address")])]),t._v(" "),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/P8PjTAo.gif",alt:""}})]),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('"address"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"tb1qrh4sq5va0unqtxyfv8al9lz3sna3988cj59uya"')]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("hr"),t._v(" "),e("h2",{attrs:{id:"step-3-send-testnet-bitcoin-to-the-newly-created-receive-address"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-3-send-testnet-bitcoin-to-the-newly-created-receive-address"}},[t._v("#")]),t._v(" Step 3: Send testnet bitcoin to the newly created receive-address")]),t._v(" "),e("p",[t._v("Use a faucet to send funds to your newly created address. Here is a link to one: "),e("a",{attrs:{href:"https://bitcoinfaucet.uo1.net",target:"_blank",rel:"noopener noreferrer"}},[t._v("Bitcoin Testnet Faucet"),e("OutboundLink")],1)]),t._v(" "),e("hr"),t._v(" "),e("h2",{attrs:{id:"step-4-sync-the-wallet"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-4-sync-the-wallet"}},[t._v("#")]),t._v(" Step 4: Sync the wallet")]),t._v(" "),e("p",[t._v("Linux/Terminal:\n▶️ "),e("code",[t._v("bdk-cli wallet --wallet wallet_name --descriptor $my_descriptor sync")])]),t._v(" "),e("p",[t._v("Windows Powershell:\n🔶 "),e("code",[t._v("bdk-cli wallet --descriptor $env:my_descriptor sync")])]),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("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("figure",[e("img",{attrs:{src:"https://i.imgur.com/WFYBgVB.gif",alt:""}})]),t._v(" "),e("hr"),t._v(" "),e("h2",{attrs:{id:"step-5-check-the-balance"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-5-check-the-balance"}},[t._v("#")]),t._v(" Step 5: Check the balance")]),t._v(" "),e("p",[t._v("Linux/Terminal:\n▶️ "),e("code",[t._v("bdk-cli wallet --wallet wallet_name --descriptor $my_descriptor get_balance")])]),t._v(" "),e("p",[t._v("Windows Powershell:\n🔶\n"),e("code",[t._v("bdk-cli wallet --descriptor $env:my_descriptor get_balance")])]),t._v(" "),e("div",{staticClass:"custom-block tip"},[e("p",{staticClass:"custom-block-title"},[t._v("TIP")]),t._v(" "),e("p",[t._v("Note: The balance will only show after the transaction has been confirmed in a block at least once.")])]),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('"satoshi"')]),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('"confirmed"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("100000")]),t._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"immature"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),t._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"trusted_pending"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),t._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"untrusted_pending"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),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("figure",[e("img",{attrs:{src:"https://i.imgur.com/v8MAYB2.gif",alt:""}})]),t._v(" "),e("hr"),t._v(" "),e("h2",{attrs:{id:"step-6-create-transaction-psbt"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#step-6-create-transaction-psbt"}},[t._v("#")]),t._v(" Step 6: Create Transaction (PSBT)")]),t._v(" "),e("p",[t._v("To create a PSBT (partially-signed-bitcoin-transaction) run the command:")]),t._v(" "),e("p",[t._v("Linux/Terminal:\n▶️ "),e("code",[t._v("bdk-cli wallet --wallet wallet_name --descriptor $my_descriptor create_tx --to tb1qw2c3lxufxqe2x9s4rdzh65tpf4d7fssjgh8nv6:50000")])]),t._v(" "),e("p",[t._v("Windows Powershell:\n🔶\n"),e("code",[t._v("bdk-cli wallet --descriptor $env:my_descriptor create_tx --to tb1qjk6n943uwhqhdf7en600tnwxpslvwtr0udsehp:0 --send_all")]),t._v(" "),e("img",{attrs:{src:"https://i.imgur.com/EUCovcJ.gif",alt:""}})]),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('"details"')]),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('"confirmation_time"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" null,\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"fee"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("113")]),t._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"received"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),t._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"sent"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("123000")]),t._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"transaction"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" null,\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"txid"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"029173d76253e3441f9dc26f91e6ef30dff486848e91a7941f0cacd0af25ee30"')]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"psbt"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"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"')]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("hr"),t._v(" "),e("h3",{attrs:{id:"6a-export-psbt-to-environment-variable"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#6a-export-psbt-to-environment-variable"}},[t._v("#")]),t._v(" 6a: export PSBT to environment-variable")]),t._v(" "),e("p",[t._v("Linux/Terminal:\n▶️ "),e("code",[t._v('export 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"),e("li",[e("a",{attrs:{href:"https://bitcoin.stackexchange.com/questions/97242/bip39-tool-bip32-extended-private-key-vs-bip32-root-key",target:"_blank",rel:"noopener noreferrer"}},[t._v("Master Private Key and Extended Private Key"),e("OutboundLink")],1)]),t._v(" "),e("li",[e("a",{attrs:{href:"https://min.sc",target:"_blank",rel:"noopener noreferrer"}},[t._v("Minsc A Miniscript-based scripting language for Bitcoin contracts"),e("OutboundLink")],1)])])])}),[],!1,null,null,null);e.default=n.exports}}]); \ No newline at end of file diff --git a/assets/js/42.bd54d519.js b/assets/js/42.83fbd218.js similarity index 99% rename from assets/js/42.bd54d519.js rename to assets/js/42.83fbd218.js index a81698357d..f85396a32b 100644 --- a/assets/js/42.bd54d519.js +++ b/assets/js/42.83fbd218.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[42],{389: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 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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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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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punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("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(")")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("p",[t._v("There are two notable differences though. 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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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 +(window.webpackJsonp=window.webpackJsonp||[]).push([[42],{390: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("It’s easy to underestimate the importance of privacy tech for Bitcoin,\nespecially when connecting to third party services. They can learn your\nIP address and associate the transactions you sent over it. 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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. 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/43.481500e2.js b/assets/js/43.94ed6f03.js similarity index 99% rename from assets/js/43.481500e2.js rename to assets/js/43.94ed6f03.js index 4963ce7856..6acc1ef2b4 100644 --- a/assets/js/43.481500e2.js +++ b/assets/js/43.94ed6f03.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[43],{392: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. 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If we rely on many underlying Rust crates, we'd need to release patches every time one of the underlying libraries patches a bug. We'd also need to keep them all in sync (what API versions work with what), and we'd be relying on work from teams that may or may not have the capacity to keep their crates up to date.")]),e._v(" "),t("li",[e._v("Scope creep. Unless we define a narrow and structured scope for the library, we will forever be handling requests for features that may or may not be feasible to accommodate.")]),e._v(" "),t("li",[e._v("Library size. Because one of our primary focus for the bindings is mobile devices, we need to make sure we don't build a library that is too big. 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This is a repository you can fork and start adding code to produce bindings directly for iOS and Android. Included are our custom-made Gradle plugin and Swift release shell scripts, as well as information about the little build quirks you need to know about for smooth releases.")]),e._v(" "),t("li",[t("strong",[t("a",{attrs:{href:"https://github.com/thunderbiscuit/uniffi-examples",target:"_blank",rel:"noopener noreferrer"}},[e._v("Uniffi examples"),t("OutboundLink")],1)]),e._v(". This repository provides boiled-down examples of APIs exposed using uniffi, with an "),t("a",{attrs:{href:"https://thunderbiscuit.github.io/uniffi-examples/",target:"_blank",rel:"noopener noreferrer"}},[e._v("accompanying documentation website"),t("OutboundLink")],1),e._v(". 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 +(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. 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When developing and using those libraries together, it quickly became clear that much of the work was duplicated; both libraries needed access to underlying rust-bitcoin types, but they both exposed their own versions of it.")]),e._v(" "),t("p",[e._v("Over the coming months, the team is looking at extracting the rust-bitcoin part of the BDK bindings library (bdk-ffi) and publishing that library on "),t("a",{attrs:{href:"https://crates.io/",target:"_blank",rel:"noopener noreferrer"}},[e._v("crates.io"),t("OutboundLink")],1),e._v(" so as to make it available to others who wish to build Rust bindings using uniffi.")]),e._v(" "),t("h2",{attrs:{id:"why-cant-we-just-build-one-big-bdk-library-with-everything-in-it"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#why-cant-we-just-build-one-big-bdk-library-with-everything-in-it"}},[e._v("#")]),e._v(" Why can't we just build one big BDK library with "),t("em",[e._v("everything")]),e._v(" in it?")]),e._v(" "),t("ol",[t("li",[e._v("The short answer to this is that it would simply not be maintainable. If we rely on many underlying Rust crates, we'd need to release patches every time one of the underlying libraries patches a bug. We'd also need to keep them all in sync (what API versions work with what), and we'd be relying on work from teams that may or may not have the capacity to keep their crates up to date.")]),e._v(" "),t("li",[e._v("Scope creep. Unless we define a narrow and structured scope for the library, we will forever be handling requests for features that may or may not be feasible to accommodate.")]),e._v(" "),t("li",[e._v("Library size. Because one of our primary focus for the bindings is mobile devices, we need to make sure we don't build a library that is too big. This is a more nuanced issue, but it relates to point (2), where too large a scope would eventually produce a library that is potentially not optimal for mobile devices because it attempts to do too much all in one package.")])]),e._v(" "),t("h2",{attrs:{id:"are-you-looking-to-build-rust-bindings-yourself"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#are-you-looking-to-build-rust-bindings-yourself"}},[e._v("#")]),e._v(" Are you looking to build Rust bindings yourself?")]),e._v(" "),t("p",[e._v("We got your back! The Bitcoin Development Kit team intends to help others in the Rust bitcoin ecosystem build bindings if they wish to. To that effect, we maintain 3 repositories that should help you get going with bindings in no time:")]),e._v(" "),t("ol",[t("li",[t("strong",[t("a",{attrs:{href:"https://github.com/thunderbiscuit/uniffi-bindings-template",target:"_blank",rel:"noopener noreferrer"}},[e._v("Uniffi library template"),t("OutboundLink")],1)]),e._v(". This is a repository you can fork and start adding code to produce bindings directly for iOS and Android. Included are our custom-made Gradle plugin and Swift release shell scripts, as well as information about the little build quirks you need to know about for smooth releases.")]),e._v(" "),t("li",[t("strong",[t("a",{attrs:{href:"https://github.com/thunderbiscuit/uniffi-examples",target:"_blank",rel:"noopener noreferrer"}},[e._v("Uniffi examples"),t("OutboundLink")],1)]),e._v(". This repository provides boiled-down examples of APIs exposed using uniffi, with an "),t("a",{attrs:{href:"https://thunderbiscuit.github.io/uniffi-examples/",target:"_blank",rel:"noopener noreferrer"}},[e._v("accompanying documentation website"),t("OutboundLink")],1),e._v(". 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/44.4d519937.js b/assets/js/44.1195b75f.js similarity index 99% rename from assets/js/44.4d519937.js rename to assets/js/44.1195b75f.js index e4c0ee6823..86cb616f3e 100644 --- a/assets/js/44.4d519937.js +++ b/assets/js/44.1195b75f.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[44],{390:function(a,e,t){"use strict";t.r(e);var s=t(7),r=Object(s.a)({},(function(){var a=this,e=a._self._c;return e("ContentSlotsDistributor",{attrs:{"slot-key":a.$parent.slotKey}},[e("h2",{attrs:{id:"introduction"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#introduction"}},[a._v("#")]),a._v(" Introduction")]),a._v(" "),e("h3",{attrs:{id:"compact-filters"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#compact-filters"}},[a._v("#")]),a._v(" Compact Filters:")]),a._v(" "),e("p",[a._v("Compact filters are the latest specification of Bitcoin SPV node implementation as per "),e("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0157.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[a._v("BIP157"),e("OutboundLink")],1),a._v(" and "),e("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0158.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[a._v("BIP158"),e("OutboundLink")],1),a._v(". Such light clients were envisioned by Satoshi himself in his original white paper, but due to lack of robust privacy and trust guarantees using conventional "),e("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0037.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[a._v("bloomfilters"),e("OutboundLink")],1),a._v(", these type of nodes never got popular.")]),a._v(" "),e("p",[a._v("Enters "),e("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0157.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[a._v("BIP157"),e("OutboundLink")],1),a._v(", which described a new type of filters for Bitcoin Blockchain data, known as "),e("code",[a._v("compact_filters")]),a._v(". The "),e("a",{attrs:{href:"https://github.com/lightninglabs/neutrino",target:"_blank",rel:"noopener noreferrer"}},[a._v("Neutrino"),e("OutboundLink")],1),a._v(' project pioneered the use of compact filter based light client nodes for using with Lightning Network wallets. Using compact filters, a light-node can talk to one or more full nodes, and fetch relevant information from the blockchain, with much more robust privacy and security guarantees than previously possible. Compact filter based nodes are best suitable to be used with mobile wallets, to create more trustless mobile applications on Bitcoin. Any wallet application that needs to have an "eye on the blockchain" has an use for such light clients.')]),a._v(" "),e("p",[e("code",[a._v("BIP157")]),a._v(" type filters allows to create tiny sized SPV nodes, that can fetch blockchain data and can identify inconsistency, so it can actively defend itself, while also preserving its privacy. Such nodes are most useful for Lightning Network mobile applications.")]),a._v(" "),e("p",[a._v("Example of such "),e("code",[a._v("compact_filters")]),a._v(" wallets in wild is "),e("a",{attrs:{href:"https://github.com/breez/breezmobile",target:"_blank",rel:"noopener noreferrer"}},[a._v("Breeze"),e("OutboundLink")],1),a._v(" Lightning mobile wallet.")]),a._v(" "),e("p",[a._v("Bitcoin core supports serving "),e("code",[a._v("BIP157")]),a._v(" type filters from "),e("code",[a._v("v0.21.0")]),a._v(".")]),a._v(" "),e("h3",{attrs:{id:"bdk-and-compact-filters"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#bdk-and-compact-filters"}},[a._v("#")]),a._v(" BDK and Compact filters")]),a._v(" "),e("p",[a._v("BDK is a bitcoin wallet development library that can be used to create bitcoin wallets with custom "),e("code",[a._v("Database")]),a._v(" and "),e("code",[a._v("Blockchain")]),a._v(" backends. BDK is a "),e("a",{attrs:{href:"https://bitcoindevkit.org/descriptors/",target:"_blank",rel:"noopener noreferrer"}},[a._v("descriptor"),e("OutboundLink")],1),a._v(" based wallet, i.e. the wallet keychain is described by a set of descriptors.")]),a._v(" "),e("p",[a._v("Using BDK one can instantiate wallets of various kinds as per requirement. BDK abstracts away all the heavy lifting works, and allow wallet devs to concentrate on logic that they care about, i.e. writing wallet codes. For more detailed documentation on BDK capabilities check these "),e("a",{attrs:{href:"https://bitcoindevkit.org/blog/2020/12/hello-world/",target:"_blank",rel:"noopener noreferrer"}},[a._v("blog"),e("OutboundLink")],1),a._v(", "),e("a",{attrs:{href:"https://bitcoindevkit.org/blog/2020/11/descriptors-in-the-wild/",target:"_blank",rel:"noopener noreferrer"}},[a._v("bog"),e("OutboundLink")],1),a._v(" and "),e("a",{attrs:{href:"https://docs.rs/bdk/",target:"_blank",rel:"noopener noreferrer"}},[a._v("docs"),e("OutboundLink")],1),a._v(".")]),a._v(" "),e("p",[a._v("The main three components of abstraction in BDK are")]),a._v(" "),e("ul",[e("li",[e("code",[a._v("Database")])]),a._v(" "),e("li",[e("code",[a._v("Descriptors")])]),a._v(" "),e("li",[e("code",[a._v("Blockchain")])])]),a._v(" "),e("p",[a._v("BDK comes with default implementations of all them that developers can start with out of the box. Developers can also create their own custom implementations and plug it into BDK (thanks to rust magic of "),e("code",[a._v("Traits")]),a._v(").")]),a._v(" "),e("p",[a._v("BDK also supports "),e("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0158.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[a._v("BIP158"),e("OutboundLink")],1),a._v(" communication protocol, which allows creation of "),e("code",[a._v("BIP157")]),a._v(" type compact filter SPV nodes. This capability is extended to wallet with BDK's "),e("code",[a._v("Blockchain")]),a._v(" data structure. The "),e("a",{attrs:{href:"https://docs.rs/bdk/latest/bdk/blockchain/trait.Blockchain.html",target:"_blank",rel:"noopener noreferrer"}},[a._v("API"),e("OutboundLink")],1),a._v(" for "),e("code",[a._v("compact_filters")]),a._v(" backend is similar to any other kind of backends, so wallet devs don't need to worry about all the details. Its ok if the dev haven't even heard of "),e("code",[a._v("BIP157")]),a._v(", BDK takes care of that in background.")]),a._v(" "),e("p",[a._v("This capability can be unlocked by compiling BDK with the "),e("code",[a._v("compact_filters")]),a._v(" feature. Once enabled, BDK will be able to create wallets with the "),e("code",[a._v("compact_filters")]),a._v(" type "),e("code",[a._v("Blockchain")]),a._v(" backend. (The default backend is electrum server)")]),a._v(" "),e("h3",{attrs:{id:"bdk-cli"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#bdk-cli"}},[a._v("#")]),a._v(" bdk-cli")]),a._v(" "),e("p",[e("code",[a._v("bdk-cli")]),a._v(" is a lightweight "),e("a",{attrs:{href:"https://codewith.mu/en/tutorials/1.0/repl",target:"_blank",rel:"noopener noreferrer"}},[a._v("REPL"),e("OutboundLink")],1),a._v(" wrapper over the BDK library to facilitate quick and easy demonstration of BDK capabilities in command-line. Wallet devs can use this tool to quickly try out different possibilities with BDK.")]),a._v(" "),e("p",[a._v("In this tutorial, We will use "),e("code",[a._v("bdk-cli")]),a._v(" to demonstrate some basic wallet functionalities using "),e("code",[a._v("compact_filters")]),a._v(" backend.")]),a._v(" "),e("h2",{attrs:{id:"tutorial-scope"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#tutorial-scope"}},[a._v("#")]),a._v(" Tutorial Scope")]),a._v(" "),e("p",[a._v("Basic wallet workflow we will cover:")]),a._v(" "),e("ul",[e("li",[a._v("create and sync a wallet,")]),a._v(" "),e("li",[a._v("receive a transaction,")]),a._v(" "),e("li",[a._v("create a transaction,")]),a._v(" "),e("li",[a._v("sign and broadcast the transaction,")]),a._v(" "),e("li",[a._v("fetch updated balance,")])]),a._v(" "),e("p",[a._v("The BDK wallet will have a "),e("code",[a._v("BIP157")]),a._v(" SPV backend (aka "),e("code",[a._v("compact_filters")]),a._v(" backend) that will connect with a Bitcoin core node serving filter data.")]),a._v(" "),e("p",[a._v("It will publish and extract transaction data through that node.")]),a._v(" "),e("p",[a._v("We will have a Bitcoin Core wallet and a BDK wallet, sending and receiving transactions between each other, in regtest.")]),a._v(" "),e("h2",{attrs:{id:"prerequisites"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#prerequisites"}},[a._v("#")]),a._v(" Prerequisites")]),a._v(" "),e("p",[a._v("Following things are required to start with the tutorial.")]),a._v(" "),e("ol",[e("li",[a._v("A Bitcoin Core regtest node listening at "),e("code",[a._v("localhost:18444")]),a._v(" signalling for compact filter support.")]),a._v(" "),e("li",[e("code",[a._v("bdk-cli")]),a._v(" compiled with "),e("code",[a._v("compact_filter")]),a._v(" features.")])]),a._v(" "),e("p",[a._v("If you already have these two setup and working, you can skip this and jump to the "),e("a",{attrs:{href:"#tutorial"}},[a._v("Tutorial")]),a._v(" section.")]),a._v(" "),e("h3",{attrs:{id:"install-and-run-bitcoind"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#install-and-run-bitcoind"}},[a._v("#")]),a._v(" Install and run "),e("code",[a._v("bitcoind")])]),a._v(" "),e("p",[a._v("You can definitely do it with your own "),e("code",[a._v("bitcoind")]),a._v(" installation. "),e("code",[a._v("BIP157")]),a._v(" support has been included in Bitcoin Core "),e("code",[a._v("v0.21.0")]),a._v(". So anything above that will work.")]),a._v(" "),e("p",[a._v("You also need to ensure proper configuration settings for signalling "),e("code",[a._v("compact_filters")]),a._v(" support.")]),a._v(" "),e("p",[a._v("For ease of testing, the BDK project hosts docker images that can be used to spawn Bitcoin Core with all the relevant configurations.")]),a._v(" "),e("ul",[e("li",[e("p",[a._v("spawn a regtest node using "),e("a",{attrs:{href:"https://github.com/bitcoindevkit/bitcoin-regtest-box",target:"_blank",rel:"noopener noreferrer"}},[a._v("bitcoin-regtest-box"),e("OutboundLink")],1),a._v(" docker file.")]),a._v(" "),e("p",[a._v("Start the regtest box docker container.")]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("docker")]),a._v(" run "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--detach")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--rm")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-p")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[a._v("127.0")]),a._v(".0.1:18443-18444:18443-18444/tcp "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--name")]),a._v(" bdk-box bitcoindevkit/bitcoind\n")])])]),e("p",[a._v("This will spin up a docker container running "),e("code",[a._v("bicoind")]),a._v(" and listening to port "),e("code",[a._v("18444")]),a._v(" and "),e("code",[a._v("18333")]),a._v(". You can keep this terminal alive to see communication events with BDK and the node.")])]),a._v(" "),e("li",[e("p",[a._v("Check node is reachable")]),a._v(" "),e("p",[a._v("In another terminal try connecting to the node with "),e("code",[a._v("bitcoin-cli")])]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("docker")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("exec")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-it")]),a._v(" bdk-box /root/bitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-regtest")]),a._v(" getnetworkinfo\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),a._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"version"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[a._v("210000")]),a._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"subversion"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"/Satoshi:0.21.1/"')]),a._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"protocolversion"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[a._v("70016")]),a._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"localservices"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"0000000000000449"')]),a._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"localservicesnames"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("[")]),a._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"NETWORK"')]),a._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"WITNESS"')]),a._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"COMPACT_FILTERS"')]),a._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"NETWORK_LIMITED"')]),a._v("\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("..")]),a._v(".\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("]")]),a._v(",\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n\n")])])]),e("p",[a._v("In the output, the "),e("code",[a._v("version")]),a._v(" should show "),e("code",[a._v("210000")]),a._v(". "),e("code",[a._v("localservicesnames")]),a._v(" should contain "),e("code",[a._v('"COMPACT_FILTERS"')]),a._v(". If you see this, then Bitcoin Core is correctly configured.")])])]),a._v(" "),e("h3",{attrs:{id:"install-and-run-bdk-cli"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#install-and-run-bdk-cli"}},[a._v("#")]),a._v(" Install and run bdk-cli")]),a._v(" "),e("ul",[e("li",[e("p",[a._v("Install "),e("code",[a._v("bdk-cli")]),a._v(" with "),e("code",[a._v("compact_filters")]),a._v(" feature")]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("cargo")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("install")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--git")]),a._v(" https://github.com/bitcoindevkit/bdk-cli.git bdk-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--features")]),a._v(" compact_filters\n")])])])]),a._v(" "),e("li",[e("p",[a._v("Check installation")]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ bdk-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--help")]),a._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("..")]),a._v(".\nUSAGE:\n bdk-cli "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("[")]),a._v("OPTIONS"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("]")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[a._v("<")]),a._v("SUBCOMMAND"),e("span",{pre:!0,attrs:{class:"token operator"}},[a._v(">")]),a._v("\nFLAGS:\n -h, "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--help")]),a._v(" Prints "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("help")]),a._v(" information\n -V, "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--version")]),a._v(" Prints version information\nOPTIONS:\n -n, "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--network")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[a._v("<")]),a._v("NETWORK"),e("span",{pre:!0,attrs:{class:"token operator"}},[a._v(">")]),a._v(" Sets the network "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("[")]),a._v("default: testnet"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("]")]),a._v("\n\nSUBCOMMANDS:\n "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("help")]),a._v(" Prints this message or the "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("help")]),a._v(" of the given subcommand"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("(")]),a._v("s"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v(")")]),a._v("\n key Key management sub-commands\n repl Enter REPL "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("command")]),a._v(" loop mode\n wallet Wallet options and sub-commands\n")])])])])]),a._v(" "),e("p",[a._v("Once these are setup correctly, you can start with the tutorial next.")]),a._v(" "),e("h2",{attrs:{id:"tutorial"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#tutorial"}},[a._v("#")]),a._v(" Tutorial")]),a._v(" "),e("p",[a._v("[Note: For brevity "),e("code",[a._v("bdk-cli")]),a._v(" results are stored in command line variables using "),e("code",[a._v("jq")]),a._v(" tool. It is recommended to check the full results to see different information returned by "),e("code",[a._v("bdk-cli")]),a._v(" commands.]")]),a._v(" "),e("h3",{attrs:{id:"bitcoin-core-wallet-generation"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#bitcoin-core-wallet-generation"}},[a._v("#")]),a._v(" Bitcoin Core Wallet Generation")]),a._v(" "),e("p",[a._v("This is standard procedure with "),e("code",[a._v("bitcoin-cli")]),a._v(".")]),a._v(" "),e("ul",[e("li",[e("p",[a._v("Create a wallet and generate 101 blocks.")]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("docker")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("exec")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-it")]),a._v(" bdk-box /root/bitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-regtest")]),a._v(" createwallet "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("test")]),a._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),a._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"name"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"test"')]),a._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"warning"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('""')]),a._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n")])])]),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("docker")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("exec")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-it")]),a._v(" bdk-box /root/bitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-regtest")]),a._v(" getnewaddress\nbcrt1qatd7yq0jukwusuaufltlejmeydpvnpv43r5gc2\n")])])]),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("docker")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("exec")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-it")]),a._v(" bdk-box /root/bitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-regtest")]),a._v(" generatetoaddress "),e("span",{pre:!0,attrs:{class:"token number"}},[a._v("101")]),a._v(" bcrt1qatd7yq0jukwusuaufltlejmeydpvnpv43r5gc2\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("[")]),a._v("\n"),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"3813ed6eb716f4743b9657d918799acf743add985a8ded28d8aa3629dd4496b6"')]),a._v(",\n"),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"70da855913bdf791b6e458c611cebdef79b7a9840eb103ce58c71c1c7e3c49bc"')]),a._v(",\n"),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"682ca732ef72719cd6f82c5047c7690fb1cd2df2543d035ac4ea99e974b8d172"')]),a._v(",\n"),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"78799e4771017d4f46aa3c240054e2d61f54cea07ec44cb18ae712761e0aaa1e"')]),a._v(",\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("..")]),a._v(".\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("]")]),a._v("\n")])])]),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("docker")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("exec")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-it")]),a._v(" bdk-box /root/bitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-regtest")]),a._v(" getbalance\n"),e("span",{pre:!0,attrs:{class:"token number"}},[a._v("50.00000000")]),a._v("\n")])])]),e("p",[a._v("Now the core wallet has generated new blocks and is funded with test bitcoin.")])])]),a._v(" "),e("h3",{attrs:{id:"bdk-wallet-generation"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#bdk-wallet-generation"}},[a._v("#")]),a._v(" BDK Wallet Generation")]),a._v(" "),e("p",[a._v("BDK is a descriptor based wallet library. So in order to use it we will need some descriptors to work with.")]),a._v(" "),e("p",[a._v("BDK wallet will ask for two descriptors as input, corresponding to "),e("code",[a._v("receive")]),a._v(" and "),e("code",[a._v("change")]),a._v(" addresses. Its recommended to have these two descriptors separate as BDK will handle them separately and ensure "),e("code",[a._v("change")]),a._v(" addresses are never used for receiving funds.")]),a._v(" "),e("p",[a._v("Or developers can decide to use a single descriptor too, in that case BDK will use that descriptor for deriving both "),e("code",[a._v("receive")]),a._v(" and "),e("code",[a._v("change")]),a._v(" addresses.")]),a._v(" "),e("p",[a._v("We will use "),e("code",[a._v("bdk-cli")]),a._v(" itself to generate such descriptors.")]),a._v(" "),e("ul",[e("li",[e("h4",{attrs:{id:"generate-a-privatekey"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#generate-a-privatekey"}},[a._v("#")]),a._v(" Generate a privatekey")]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[a._v("BDK_xprv")]),e("span",{pre:!0,attrs:{class:"token operator"}},[a._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$(")]),a._v("bdk-cli key generate "),e("span",{pre:!0,attrs:{class:"token operator"}},[a._v("|")]),a._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-r")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v("'.xprv'")]),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v(")")])]),a._v("\n$ "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("echo")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BDK_xprv")]),a._v("\ntprv8ZgxMBicQKsPefY7tdq7EKny81n9tfSvUYfSHAZByXdjPAZVysvaB6sFd2YavqfqMBgbHaXUG5oWM6sYvdJn6vnUizzQKTYAJ36bQsfPv4N\n")])])]),e("p",[e("code",[a._v("bdk-cli key generate")]),a._v(" will generate a fresh master key with "),e("code",[a._v("mnemonic")]),a._v(" and "),e("code",[a._v("xprv")]),a._v(". We have extracted the value of extended private key and stored it in "),e("code",[a._v("BDK_xprv")]),a._v(" variable.")]),a._v(" "),e("p",[a._v("The returned "),e("code",[a._v("mnemonic")]),a._v(" can be used to restore back the wallet if wallet data directory is lost.")])]),a._v(" "),e("li",[e("h4",{attrs:{id:"generate-descriptors"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#generate-descriptors"}},[a._v("#")]),a._v(" Generate Descriptors")]),a._v(" "),e("p",[e("code",[a._v("bdk-cli key derive")]),a._v(" can derive an "),e("code",[a._v("xpub")]),a._v("s given a "),e("code",[a._v("master key")]),a._v(" and "),e("code",[a._v("derivation_path")]),a._v(".")]),a._v(" "),e("p",[a._v("We will use the following paths for our "),e("code",[a._v("receive")]),a._v(" and "),e("code",[a._v("change")]),a._v(" descriptors")]),a._v(" "),e("ul",[e("li",[e("code",[a._v("receive")]),a._v(" path: "),e("code",[a._v("m/84h/1h/0h/0")])]),a._v(" "),e("li",[e("code",[a._v("change")]),a._v(" path: 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"),e("li",[a._v("connected to a full node ("),e("code",[a._v("--node")]),a._v(") listening at "),e("code",[a._v("127.0.0.1:18444")]),a._v(",")]),a._v(" "),e("li",[a._v("and finally create and sync the wallet with the "),e("code",[a._v("sync")]),a._v(" command.")])]),a._v(" "),e("p",[a._v("If you are using a "),e("code",[a._v("regtest")]),a._v(" node, also add "),e("code",[a._v("--network regtest")]),a._v(", the default is "),e("code",[a._v("testnet")]),a._v(".")]),a._v(" "),e("p",[e("code",[a._v("bdk-cli")]),a._v(" makes multiple parallel connections that can be configured with the "),e("code",[a._v("--conn-count")]),a._v(" parameter (default is 4). This makes syncing parallel and fast. Use "),e("code",[a._v("bdk-cli --help")]),a._v(" to see all other options.")]),a._v(" "),e("p",[a._v("Getting an empty return means wallet creation succeeded.")]),a._v(" "),e("p",[a._v("BDK has created a wallet named "),e("code",[a._v("bdk-test")]),a._v(" in its data directory. Which is by default stored at "),e("code",[a._v("~/.bdk-bitcoin/compact_filters")]),a._v(" folder.")]),a._v(" "),e("p",[a._v("Looking into that folder different files and directories maintained by BDK can be seen.")]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("ls")]),a._v(" .bdk-bitcoin/compact_filters/\n000004.log CURRENT LOCK MANIFEST-000003 OPTIONS-000010\nbdk-test IDENTITY LOG OPTIONS-000008\n")])])])])]),a._v(" "),e("h3",{attrs:{id:"recieve-coins"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#recieve-coins"}},[a._v("#")]),a._v(" Recieve Coins")]),a._v(" "),e("p",[a._v("We will use the "),e("code",[a._v("core")]),a._v(" wallet to send 5 BTC to our"),e("code",[a._v("bdk-test")]),a._v(" wallet.")]),a._v(" "),e("ul",[e("li",[e("p",[a._v("Fetch a new address using "),e("code",[a._v("bdk-cli")])]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ bdk-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--network")]),a._v(" regtest wallet "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--node")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"127.0.0.1:18444"')]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--wallet")]),a._v(" bdk-test "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BDK_recv_desc")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-c")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BDK_chng_desc")]),a._v(" get_new_address\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),a._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"address"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"bcrt1qx2479wywulf50pqx5uy64zhxq9f3tuvlh8u0s9"')]),a._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n")])])])]),a._v(" "),e("li",[e("p",[a._v("Transfer funds to the previous address and generate a block, using "),e("code",[a._v("bitcoin-cli")])]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("docker")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("exec")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-it")]),a._v(" bdk-box /root/bitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-regtest")]),a._v(" sendtoaddress bcrt1qx2479wywulf50pqx5uy64zhxq9f3tuvlh8u0s9 "),e("span",{pre:!0,attrs:{class:"token number"}},[a._v("5")]),a._v("\n\n\n$ "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("docker")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("exec")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-it")]),a._v(" bdk-box /root/bitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-regtest")]),a._v(" generatetoaddress "),e("span",{pre:!0,attrs:{class:"token number"}},[a._v("1")]),a._v(" bcrt1qw3ht9xtc9pgyvmqay0ap9fw8mxd27az8el0uz3\n")])])]),e("p",[e("code",[a._v("core")]),a._v(" has sent 5 BTC to our "),e("code",[a._v("bdk-test")]),a._v(" wallet. Which is confirmed in a new block.")]),a._v(" "),e("p",[e("code",[a._v("bdk-test")]),a._v(" can see that now by syncing again.")]),a._v(" "),e("p",[a._v("(Note: BDK required explicit "),e("code",[a._v("sync()")]),a._v(" calls to give wallet developers flexibility on when to sync).")]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ bdk-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--network")]),a._v(" regtest wallet "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--node")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"127.0.0.1:18444"')]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--wallet")]),a._v(" bdk-test "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BDK_recv_desc")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-c")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BDK_chng_desc")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("sync")]),a._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n\n$ bdk-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--network")]),a._v(" regtest wallet "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--node")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"127.0.0.1:18444"')]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--wallet")]),a._v(" bdk-test "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BDK_recv_desc")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-c")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BDK_chng_desc")]),a._v(" get_balance\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),a._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"satoshi"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[a._v("500000000")]),a._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n")])])]),e("p",[a._v("We can see "),e("code",[a._v("500000000")]),a._v(" sats balance in our "),e("code",[a._v("bdk-test")]),a._v(" wallet.")]),a._v(" "),e("p",[a._v("BDK has fetched blockchain details concerning its wallet descriptors, from the core node, using compact filters.")])])]),a._v(" "),e("h3",{attrs:{id:"creating-a-transaction"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#creating-a-transaction"}},[a._v("#")]),a._v(" Creating a transaction.")]),a._v(" "),e("p",[a._v("Now we want to create a transaction sending coins from "),e("code",[a._v("bdk-test")]),a._v(" wallet to the "),e("code",[a._v("core")]),a._v(" wallet.")]),a._v(" "),e("ul",[e("li",[e("p",[a._v("fetch a new "),e("code",[a._v("core")]),a._v(" address")]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[a._v("core_addrs")]),e("span",{pre:!0,attrs:{class:"token operator"}},[a._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$(")]),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("docker")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("exec")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-it")]),a._v(" bdk-box /root/bitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-regtest")]),a._v(" getnewaddress "),e("span",{pre:!0,attrs:{class:"token operator"}},[a._v("|")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("tr")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v("'\\r'")]),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v(")")])]),a._v("\n")])])])]),a._v(" "),e("li",[e("p",[a._v("Create a raw transaction using "),e("code",[a._v("bdk-cli")]),a._v(" to the above address. This will generate a "),e("code",[a._v("psbt")]),a._v(" which we will sign.")]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[a._v("psbt")]),e("span",{pre:!0,attrs:{class:"token operator"}},[a._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$(")]),a._v("bdk-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--network")]),a._v(" regtest wallet "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--node")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"127.0.0.1:18444"')]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--wallet")]),a._v(" bdk-test "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" $BDK_recv_desc "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-c")]),a._v(" $BDK_chng_desc create_tx "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--to")]),a._v(" $core_addrs:200000000 "),e("span",{pre:!0,attrs:{class:"token operator"}},[a._v("|")]),a._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-r")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v("'.psbt'")]),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v(")")])]),a._v("\n")])])]),e("p",[a._v("(Recommended to check all the other information returned by "),e("code",[a._v("bdk-cli create_tx")]),a._v(")")])])]),a._v(" "),e("h3",{attrs:{id:"sign-and-broadcast-the-transaction"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#sign-and-broadcast-the-transaction"}},[a._v("#")]),a._v(" Sign and Broadcast the transaction")]),a._v(" "),e("p",[a._v("Asking BDK to sign a transaction is as straight forward as it can get. BDK already holds the "),e("code",[a._v("xprv")]),a._v(" deatils to sign a transaction. It returns a finalised "),e("code",[a._v("signed_psbt")]),a._v(" which we will next broadcast to the network.")]),a._v(" "),e("ul",[e("li",[e("p",[a._v("Sign the transaction")]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[a._v("signed_psbt")]),e("span",{pre:!0,attrs:{class:"token operator"}},[a._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$(")]),a._v("bdk-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--network")]),a._v(" regtest wallet "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--node")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"127.0.0.1:18444"')]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--wallet")]),a._v(" bdk-test "),e("span",{pre:!0,attrs:{class:"token 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"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("]")]),a._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"hex"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"01000000000101d84e8cb7477f9fe6f265b56d5416ff47da9a70be18f65ec50731b8257c67f2bd0100000000ffffffff0273a2e11100000000160014874270187001febc4cebd8cb083cf2c783e8f1ac00c2eb0b000000001600148deb786b6ccd1b8ff9bd8b6bdc6fe153ef73e22b0247304402201037d9ef5b80392296311c8899b1f12a0987778d694a442a88bafa6fbd7a7c9a022011293176255897444d9c71b0b9cd13b2aedb749b142577566c90a63d61025e2c01210202427d16b29c1c8546255363a74326ee9ab3196770bb3fccc7b679d52f9c1ccf00000000"')]),a._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n")])])]),e("p",[a._v("This means, core has recieved the transaction in its mempool and waiting for confirmation.")])]),a._v(" "),e("li",[e("p",[a._v("Generate 1 block to confirm the transaction")]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("docker")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("exec")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-it")]),a._v(" bdk-box /root/bitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-regtest")]),a._v(" generatetoaddress "),e("span",{pre:!0,attrs:{class:"token number"}},[a._v("1")]),a._v(" bcrt1qatd7yq0jukwusuaufltlejmeydpvnpv43r5gc2\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("[")]),a._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"55436ff0169bbb3e70ab10cb7cdd45ab86204d5d7864a109142d91120d023197"')]),a._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("]")]),a._v("\n")])])])]),a._v(" "),e("li",[e("p",[a._v("Sync the "),e("code",[a._v("bdk-test")]),a._v(" wallet and ask for available balance.")]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v(" $ bdk-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--network")]),a._v(" regtest wallet "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--node")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"127.0.0.1:18444"')]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--wallet")]),a._v(" bdk-test "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BDK_recv_desc")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-c")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BDK_chng_desc")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("sync")]),a._v("\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n\n $ bdk-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--network")]),a._v(" regtest wallet "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--node")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"127.0.0.1:18444"')]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--wallet")]),a._v(" bdk-test "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BDK_recv_desc")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-c")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BDK_chng_desc")]),a._v(" get_balance\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),a._v("\n \t"),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"satoshi"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[a._v("299999859")]),a._v("\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n")])])]),e("p",[a._v("If you see the balance updated, voila!")]),a._v(" "),e("p",[a._v("What happened here is:")]),a._v(" "),e("ul",[e("li",[a._v("core created a new block containing the transaction.")]),a._v(" "),e("li",[e("code",[a._v("bdk-cli")]),a._v(" fetched the corresponding filter data.")]),a._v(" "),e("li",[a._v("It noticed it got a concerning transaction.")]),a._v(" "),e("li",[a._v("It asked for the details of that transaction from the core node.")]),a._v(" "),e("li",[a._v("It updated its wallet details with this new information.")]),a._v(" "),e("li",[a._v("The update is reflected in the wallet balance.")])])])]),a._v(" "),e("h3",{attrs:{id:"shutdown-docker"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#shutdown-docker"}},[a._v("#")]),a._v(" Shutdown Docker")]),a._v(" "),e("p",[a._v("You may now shutdown the regtest docker container.")]),a._v(" "),e("p",[a._v("Note: This will also clean up any data in the bitcoin core, including the wallet.")]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("docker")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("kill")]),a._v(" bdk-box\n")])])]),e("h2",{attrs:{id:"end-words"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#end-words"}},[a._v("#")]),a._v(" End Words")]),a._v(" "),e("p",[a._v("In this tutorial we went through the process of receiving, creating, signing and broadcasting transaction using the BDK wallet with "),e("code",[a._v("compact_filters")]),a._v(" feature. This demonstrates how BDK capabilities can be used to create SPV light wallets with integrated "),e("code",[a._v("BIP157")]),a._v(" type "),e("code",[a._v("compact_filters")]),a._v(" node.")])])}),[],!1,null,null,null);e.default=r.exports}}]); \ No newline at end of file +(window.webpackJsonp=window.webpackJsonp||[]).push([[44],{392:function(a,e,t){"use strict";t.r(e);var s=t(7),r=Object(s.a)({},(function(){var a=this,e=a._self._c;return e("ContentSlotsDistributor",{attrs:{"slot-key":a.$parent.slotKey}},[e("h2",{attrs:{id:"introduction"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#introduction"}},[a._v("#")]),a._v(" Introduction")]),a._v(" "),e("h3",{attrs:{id:"compact-filters"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#compact-filters"}},[a._v("#")]),a._v(" Compact Filters:")]),a._v(" "),e("p",[a._v("Compact filters are the latest specification of Bitcoin SPV node implementation as per "),e("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0157.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[a._v("BIP157"),e("OutboundLink")],1),a._v(" and "),e("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0158.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[a._v("BIP158"),e("OutboundLink")],1),a._v(". Such light clients were envisioned by Satoshi himself in his original white paper, but due to lack of robust privacy and trust guarantees using conventional "),e("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0037.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[a._v("bloomfilters"),e("OutboundLink")],1),a._v(", these type of nodes never got popular.")]),a._v(" "),e("p",[a._v("Enters "),e("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0157.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[a._v("BIP157"),e("OutboundLink")],1),a._v(", which described a new type of filters for Bitcoin Blockchain data, known as "),e("code",[a._v("compact_filters")]),a._v(". The "),e("a",{attrs:{href:"https://github.com/lightninglabs/neutrino",target:"_blank",rel:"noopener noreferrer"}},[a._v("Neutrino"),e("OutboundLink")],1),a._v(' project pioneered the use of compact filter based light client nodes for using with Lightning Network wallets. Using compact filters, a light-node can talk to one or more full nodes, and fetch relevant information from the blockchain, with much more robust privacy and security guarantees than previously possible. Compact filter based nodes are best suitable to be used with mobile wallets, to create more trustless mobile applications on Bitcoin. Any wallet application that needs to have an "eye on the blockchain" has an use for such light clients.')]),a._v(" "),e("p",[e("code",[a._v("BIP157")]),a._v(" type filters allows to create tiny sized SPV nodes, that can fetch blockchain data and can identify inconsistency, so it can actively defend itself, while also preserving its privacy. Such nodes are most useful for Lightning Network mobile applications.")]),a._v(" "),e("p",[a._v("Example of such "),e("code",[a._v("compact_filters")]),a._v(" wallets in wild is "),e("a",{attrs:{href:"https://github.com/breez/breezmobile",target:"_blank",rel:"noopener noreferrer"}},[a._v("Breeze"),e("OutboundLink")],1),a._v(" Lightning mobile wallet.")]),a._v(" "),e("p",[a._v("Bitcoin core supports serving "),e("code",[a._v("BIP157")]),a._v(" type filters from "),e("code",[a._v("v0.21.0")]),a._v(".")]),a._v(" "),e("h3",{attrs:{id:"bdk-and-compact-filters"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#bdk-and-compact-filters"}},[a._v("#")]),a._v(" BDK and Compact filters")]),a._v(" "),e("p",[a._v("BDK is a bitcoin wallet development library that can be used to create bitcoin wallets with custom "),e("code",[a._v("Database")]),a._v(" and "),e("code",[a._v("Blockchain")]),a._v(" backends. BDK is a "),e("a",{attrs:{href:"https://bitcoindevkit.org/descriptors/",target:"_blank",rel:"noopener noreferrer"}},[a._v("descriptor"),e("OutboundLink")],1),a._v(" based wallet, i.e. the wallet keychain is described by a set of descriptors.")]),a._v(" "),e("p",[a._v("Using BDK one can instantiate wallets of various kinds as per requirement. BDK abstracts away all the heavy lifting works, and allow wallet devs to concentrate on logic that they care about, i.e. writing wallet codes. For more detailed documentation on BDK capabilities check these "),e("a",{attrs:{href:"https://bitcoindevkit.org/blog/2020/12/hello-world/",target:"_blank",rel:"noopener noreferrer"}},[a._v("blog"),e("OutboundLink")],1),a._v(", "),e("a",{attrs:{href:"https://bitcoindevkit.org/blog/2020/11/descriptors-in-the-wild/",target:"_blank",rel:"noopener noreferrer"}},[a._v("bog"),e("OutboundLink")],1),a._v(" and "),e("a",{attrs:{href:"https://docs.rs/bdk/",target:"_blank",rel:"noopener noreferrer"}},[a._v("docs"),e("OutboundLink")],1),a._v(".")]),a._v(" "),e("p",[a._v("The main three components of abstraction in BDK are")]),a._v(" "),e("ul",[e("li",[e("code",[a._v("Database")])]),a._v(" "),e("li",[e("code",[a._v("Descriptors")])]),a._v(" "),e("li",[e("code",[a._v("Blockchain")])])]),a._v(" "),e("p",[a._v("BDK comes with default implementations of all them that developers can start with out of the box. Developers can also create their own custom implementations and plug it into BDK (thanks to rust magic of "),e("code",[a._v("Traits")]),a._v(").")]),a._v(" "),e("p",[a._v("BDK also supports "),e("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0158.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[a._v("BIP158"),e("OutboundLink")],1),a._v(" communication protocol, which allows creation of "),e("code",[a._v("BIP157")]),a._v(" type compact filter SPV nodes. This capability is extended to wallet with BDK's "),e("code",[a._v("Blockchain")]),a._v(" data structure. The "),e("a",{attrs:{href:"https://docs.rs/bdk/latest/bdk/blockchain/trait.Blockchain.html",target:"_blank",rel:"noopener noreferrer"}},[a._v("API"),e("OutboundLink")],1),a._v(" for "),e("code",[a._v("compact_filters")]),a._v(" backend is similar to any other kind of backends, so wallet devs don't need to worry about all the details. Its ok if the dev haven't even heard of "),e("code",[a._v("BIP157")]),a._v(", BDK takes care of that in background.")]),a._v(" "),e("p",[a._v("This capability can be unlocked by compiling BDK with the "),e("code",[a._v("compact_filters")]),a._v(" feature. Once enabled, BDK will be able to create wallets with the "),e("code",[a._v("compact_filters")]),a._v(" type "),e("code",[a._v("Blockchain")]),a._v(" backend. (The default backend is electrum server)")]),a._v(" "),e("h3",{attrs:{id:"bdk-cli"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#bdk-cli"}},[a._v("#")]),a._v(" bdk-cli")]),a._v(" "),e("p",[e("code",[a._v("bdk-cli")]),a._v(" is a lightweight "),e("a",{attrs:{href:"https://codewith.mu/en/tutorials/1.0/repl",target:"_blank",rel:"noopener noreferrer"}},[a._v("REPL"),e("OutboundLink")],1),a._v(" wrapper over the BDK library to facilitate quick and easy demonstration of BDK capabilities in command-line. Wallet devs can use this tool to quickly try out different possibilities with BDK.")]),a._v(" "),e("p",[a._v("In this tutorial, We will use "),e("code",[a._v("bdk-cli")]),a._v(" to demonstrate some basic wallet functionalities using "),e("code",[a._v("compact_filters")]),a._v(" backend.")]),a._v(" "),e("h2",{attrs:{id:"tutorial-scope"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#tutorial-scope"}},[a._v("#")]),a._v(" Tutorial Scope")]),a._v(" "),e("p",[a._v("Basic wallet workflow we will cover:")]),a._v(" "),e("ul",[e("li",[a._v("create and sync a wallet,")]),a._v(" "),e("li",[a._v("receive a transaction,")]),a._v(" "),e("li",[a._v("create a transaction,")]),a._v(" "),e("li",[a._v("sign and broadcast the transaction,")]),a._v(" "),e("li",[a._v("fetch updated balance,")])]),a._v(" "),e("p",[a._v("The BDK wallet will have a "),e("code",[a._v("BIP157")]),a._v(" SPV backend (aka "),e("code",[a._v("compact_filters")]),a._v(" backend) that will connect with a Bitcoin core node serving filter data.")]),a._v(" "),e("p",[a._v("It will publish and extract transaction data through that node.")]),a._v(" "),e("p",[a._v("We will have a Bitcoin Core wallet and a BDK wallet, sending and receiving transactions between each other, in regtest.")]),a._v(" "),e("h2",{attrs:{id:"prerequisites"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#prerequisites"}},[a._v("#")]),a._v(" Prerequisites")]),a._v(" "),e("p",[a._v("Following things are required to start with the tutorial.")]),a._v(" "),e("ol",[e("li",[a._v("A Bitcoin Core regtest node listening at "),e("code",[a._v("localhost:18444")]),a._v(" signalling for compact filter support.")]),a._v(" "),e("li",[e("code",[a._v("bdk-cli")]),a._v(" compiled with "),e("code",[a._v("compact_filter")]),a._v(" features.")])]),a._v(" "),e("p",[a._v("If you already have these two setup and working, you can skip this and jump to the "),e("a",{attrs:{href:"#tutorial"}},[a._v("Tutorial")]),a._v(" section.")]),a._v(" "),e("h3",{attrs:{id:"install-and-run-bitcoind"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#install-and-run-bitcoind"}},[a._v("#")]),a._v(" Install and run "),e("code",[a._v("bitcoind")])]),a._v(" "),e("p",[a._v("You can definitely do it with your own "),e("code",[a._v("bitcoind")]),a._v(" installation. "),e("code",[a._v("BIP157")]),a._v(" support has been included in Bitcoin Core "),e("code",[a._v("v0.21.0")]),a._v(". So anything above that will work.")]),a._v(" "),e("p",[a._v("You also need to ensure proper configuration settings for signalling "),e("code",[a._v("compact_filters")]),a._v(" support.")]),a._v(" "),e("p",[a._v("For ease of testing, the BDK project hosts docker images that can be used to spawn Bitcoin Core with all the relevant configurations.")]),a._v(" "),e("ul",[e("li",[e("p",[a._v("spawn a regtest node using "),e("a",{attrs:{href:"https://github.com/bitcoindevkit/bitcoin-regtest-box",target:"_blank",rel:"noopener noreferrer"}},[a._v("bitcoin-regtest-box"),e("OutboundLink")],1),a._v(" docker file.")]),a._v(" "),e("p",[a._v("Start the regtest box docker container.")]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("docker")]),a._v(" run "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--detach")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--rm")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-p")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[a._v("127.0")]),a._v(".0.1:18443-18444:18443-18444/tcp "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--name")]),a._v(" bdk-box bitcoindevkit/bitcoind\n")])])]),e("p",[a._v("This will spin up a docker container running "),e("code",[a._v("bicoind")]),a._v(" and listening to port "),e("code",[a._v("18444")]),a._v(" and "),e("code",[a._v("18333")]),a._v(". You can keep this terminal alive to see communication events with BDK and the node.")])]),a._v(" "),e("li",[e("p",[a._v("Check node is reachable")]),a._v(" "),e("p",[a._v("In another terminal try connecting to the node with "),e("code",[a._v("bitcoin-cli")])]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("docker")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("exec")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-it")]),a._v(" bdk-box /root/bitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-regtest")]),a._v(" getnetworkinfo\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),a._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"version"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[a._v("210000")]),a._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"subversion"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"/Satoshi:0.21.1/"')]),a._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"protocolversion"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[a._v("70016")]),a._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"localservices"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"0000000000000449"')]),a._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"localservicesnames"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("[")]),a._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"NETWORK"')]),a._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"WITNESS"')]),a._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"COMPACT_FILTERS"')]),a._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"NETWORK_LIMITED"')]),a._v("\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("..")]),a._v(".\n "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("]")]),a._v(",\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n\n")])])]),e("p",[a._v("In the output, the "),e("code",[a._v("version")]),a._v(" should show "),e("code",[a._v("210000")]),a._v(". 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If you see this, then Bitcoin Core is correctly configured.")])])]),a._v(" "),e("h3",{attrs:{id:"install-and-run-bdk-cli"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#install-and-run-bdk-cli"}},[a._v("#")]),a._v(" Install and run bdk-cli")]),a._v(" "),e("ul",[e("li",[e("p",[a._v("Install "),e("code",[a._v("bdk-cli")]),a._v(" with "),e("code",[a._v("compact_filters")]),a._v(" feature")]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("cargo")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("install")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--git")]),a._v(" https://github.com/bitcoindevkit/bdk-cli.git bdk-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--features")]),a._v(" compact_filters\n")])])])]),a._v(" "),e("li",[e("p",[a._v("Check installation")]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ bdk-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--help")]),a._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("..")]),a._v(".\nUSAGE:\n bdk-cli "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("[")]),a._v("OPTIONS"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("]")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[a._v("<")]),a._v("SUBCOMMAND"),e("span",{pre:!0,attrs:{class:"token operator"}},[a._v(">")]),a._v("\nFLAGS:\n -h, "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--help")]),a._v(" Prints "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("help")]),a._v(" information\n -V, "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--version")]),a._v(" Prints version information\nOPTIONS:\n -n, "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--network")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[a._v("<")]),a._v("NETWORK"),e("span",{pre:!0,attrs:{class:"token operator"}},[a._v(">")]),a._v(" Sets the network "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("[")]),a._v("default: testnet"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("]")]),a._v("\n\nSUBCOMMANDS:\n "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("help")]),a._v(" Prints this message or the "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("help")]),a._v(" of the given subcommand"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("(")]),a._v("s"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v(")")]),a._v("\n key Key management sub-commands\n repl Enter REPL "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("command")]),a._v(" loop mode\n wallet Wallet options and sub-commands\n")])])])])]),a._v(" "),e("p",[a._v("Once these are setup correctly, you can start with the tutorial next.")]),a._v(" "),e("h2",{attrs:{id:"tutorial"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#tutorial"}},[a._v("#")]),a._v(" Tutorial")]),a._v(" "),e("p",[a._v("[Note: For brevity "),e("code",[a._v("bdk-cli")]),a._v(" results are stored in command line variables using "),e("code",[a._v("jq")]),a._v(" tool. It is recommended to check the full results to see different information returned by "),e("code",[a._v("bdk-cli")]),a._v(" commands.]")]),a._v(" "),e("h3",{attrs:{id:"bitcoin-core-wallet-generation"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#bitcoin-core-wallet-generation"}},[a._v("#")]),a._v(" Bitcoin Core Wallet Generation")]),a._v(" "),e("p",[a._v("This is standard procedure with "),e("code",[a._v("bitcoin-cli")]),a._v(".")]),a._v(" "),e("ul",[e("li",[e("p",[a._v("Create a wallet and generate 101 blocks.")]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("docker")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("exec")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-it")]),a._v(" bdk-box /root/bitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-regtest")]),a._v(" createwallet "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("test")]),a._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),a._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"name"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"test"')]),a._v(",\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"warning"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('""')]),a._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n")])])]),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("docker")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("exec")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-it")]),a._v(" bdk-box /root/bitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-regtest")]),a._v(" getnewaddress\nbcrt1qatd7yq0jukwusuaufltlejmeydpvnpv43r5gc2\n")])])]),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("docker")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("exec")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-it")]),a._v(" bdk-box /root/bitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-regtest")]),a._v(" generatetoaddress "),e("span",{pre:!0,attrs:{class:"token number"}},[a._v("101")]),a._v(" bcrt1qatd7yq0jukwusuaufltlejmeydpvnpv43r5gc2\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("[")]),a._v("\n"),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"3813ed6eb716f4743b9657d918799acf743add985a8ded28d8aa3629dd4496b6"')]),a._v(",\n"),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"70da855913bdf791b6e458c611cebdef79b7a9840eb103ce58c71c1c7e3c49bc"')]),a._v(",\n"),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"682ca732ef72719cd6f82c5047c7690fb1cd2df2543d035ac4ea99e974b8d172"')]),a._v(",\n"),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"78799e4771017d4f46aa3c240054e2d61f54cea07ec44cb18ae712761e0aaa1e"')]),a._v(",\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("..")]),a._v(".\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("]")]),a._v("\n")])])]),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("docker")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("exec")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-it")]),a._v(" bdk-box /root/bitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-regtest")]),a._v(" getbalance\n"),e("span",{pre:!0,attrs:{class:"token number"}},[a._v("50.00000000")]),a._v("\n")])])]),e("p",[a._v("Now the core wallet has generated new blocks and is funded with test bitcoin.")])])]),a._v(" "),e("h3",{attrs:{id:"bdk-wallet-generation"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#bdk-wallet-generation"}},[a._v("#")]),a._v(" BDK Wallet Generation")]),a._v(" "),e("p",[a._v("BDK is a descriptor based wallet library. So in order to use it we will need some descriptors to work with.")]),a._v(" "),e("p",[a._v("BDK wallet will ask for two descriptors as input, corresponding to "),e("code",[a._v("receive")]),a._v(" and "),e("code",[a._v("change")]),a._v(" addresses. Its recommended to have these two descriptors separate as BDK will handle them separately and ensure "),e("code",[a._v("change")]),a._v(" addresses are never used for receiving funds.")]),a._v(" "),e("p",[a._v("Or developers can decide to use a single descriptor too, in that case BDK will use that descriptor for deriving both "),e("code",[a._v("receive")]),a._v(" and "),e("code",[a._v("change")]),a._v(" addresses.")]),a._v(" "),e("p",[a._v("We will use "),e("code",[a._v("bdk-cli")]),a._v(" itself to generate such descriptors.")]),a._v(" "),e("ul",[e("li",[e("h4",{attrs:{id:"generate-a-privatekey"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#generate-a-privatekey"}},[a._v("#")]),a._v(" Generate a privatekey")]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[a._v("BDK_xprv")]),e("span",{pre:!0,attrs:{class:"token operator"}},[a._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$(")]),a._v("bdk-cli key generate "),e("span",{pre:!0,attrs:{class:"token operator"}},[a._v("|")]),a._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-r")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v("'.xprv'")]),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v(")")])]),a._v("\n$ "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("echo")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BDK_xprv")]),a._v("\ntprv8ZgxMBicQKsPefY7tdq7EKny81n9tfSvUYfSHAZByXdjPAZVysvaB6sFd2YavqfqMBgbHaXUG5oWM6sYvdJn6vnUizzQKTYAJ36bQsfPv4N\n")])])]),e("p",[e("code",[a._v("bdk-cli key generate")]),a._v(" will generate a fresh master key with "),e("code",[a._v("mnemonic")]),a._v(" and "),e("code",[a._v("xprv")]),a._v(". 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"),e("code",[a._v("master key")]),a._v(", this will allow BDK to have signing capabilities.\nWe could have used an "),e("code",[a._v("xpub")]),a._v(" master key here instead, that would create an "),e("code",[a._v("watch-only")]),a._v(" wallet.")])]),a._v(" "),e("li",[e("h4",{attrs:{id:"create-and-sync-a-wallet"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#create-and-sync-a-wallet"}},[a._v("#")]),a._v(" Create and Sync a wallet")]),a._v(" "),e("p",[a._v("We will now instruct BDK to create a new wallet with following instructions")]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ bdk-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--network")]),a._v(" regtest wallet "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--node")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"127.0.0.1:18444"')]),a._v(" "),e("span",{pre:!0,attrs:{class:"token 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"),e("li",[a._v("connected to a full node ("),e("code",[a._v("--node")]),a._v(") listening at "),e("code",[a._v("127.0.0.1:18444")]),a._v(",")]),a._v(" "),e("li",[a._v("and finally create and sync the wallet with the "),e("code",[a._v("sync")]),a._v(" command.")])]),a._v(" "),e("p",[a._v("If you are using a "),e("code",[a._v("regtest")]),a._v(" node, also add "),e("code",[a._v("--network regtest")]),a._v(", the default is "),e("code",[a._v("testnet")]),a._v(".")]),a._v(" "),e("p",[e("code",[a._v("bdk-cli")]),a._v(" makes multiple parallel connections that can be configured with the "),e("code",[a._v("--conn-count")]),a._v(" parameter (default is 4). This makes syncing parallel and fast. Use "),e("code",[a._v("bdk-cli --help")]),a._v(" to see all other options.")]),a._v(" "),e("p",[a._v("Getting an empty return means wallet creation succeeded.")]),a._v(" "),e("p",[a._v("BDK has created a wallet named "),e("code",[a._v("bdk-test")]),a._v(" in its data directory. Which is by default stored at "),e("code",[a._v("~/.bdk-bitcoin/compact_filters")]),a._v(" folder.")]),a._v(" "),e("p",[a._v("Looking into that folder different files and directories maintained by BDK can be seen.")]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("ls")]),a._v(" .bdk-bitcoin/compact_filters/\n000004.log CURRENT LOCK MANIFEST-000003 OPTIONS-000010\nbdk-test IDENTITY LOG OPTIONS-000008\n")])])])])]),a._v(" "),e("h3",{attrs:{id:"recieve-coins"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#recieve-coins"}},[a._v("#")]),a._v(" Recieve Coins")]),a._v(" "),e("p",[a._v("We will use the "),e("code",[a._v("core")]),a._v(" wallet to send 5 BTC to our"),e("code",[a._v("bdk-test")]),a._v(" wallet.")]),a._v(" "),e("ul",[e("li",[e("p",[a._v("Fetch a new address using "),e("code",[a._v("bdk-cli")])]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ bdk-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--network")]),a._v(" regtest wallet "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--node")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"127.0.0.1:18444"')]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--wallet")]),a._v(" bdk-test "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BDK_recv_desc")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-c")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BDK_chng_desc")]),a._v(" get_new_address\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),a._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"address"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"bcrt1qx2479wywulf50pqx5uy64zhxq9f3tuvlh8u0s9"')]),a._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n")])])])]),a._v(" "),e("li",[e("p",[a._v("Transfer funds to the previous address and generate a block, using "),e("code",[a._v("bitcoin-cli")])]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("docker")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("exec")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-it")]),a._v(" bdk-box /root/bitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-regtest")]),a._v(" sendtoaddress bcrt1qx2479wywulf50pqx5uy64zhxq9f3tuvlh8u0s9 "),e("span",{pre:!0,attrs:{class:"token number"}},[a._v("5")]),a._v("\n\n\n$ "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("docker")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("exec")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-it")]),a._v(" bdk-box /root/bitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-regtest")]),a._v(" generatetoaddress "),e("span",{pre:!0,attrs:{class:"token number"}},[a._v("1")]),a._v(" bcrt1qw3ht9xtc9pgyvmqay0ap9fw8mxd27az8el0uz3\n")])])]),e("p",[e("code",[a._v("core")]),a._v(" has sent 5 BTC to our "),e("code",[a._v("bdk-test")]),a._v(" wallet. Which is confirmed in a new block.")]),a._v(" "),e("p",[e("code",[a._v("bdk-test")]),a._v(" can see that now by syncing again.")]),a._v(" "),e("p",[a._v("(Note: BDK required explicit "),e("code",[a._v("sync()")]),a._v(" calls to give wallet developers flexibility on when to sync).")]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ bdk-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--network")]),a._v(" regtest wallet "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--node")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"127.0.0.1:18444"')]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--wallet")]),a._v(" bdk-test "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BDK_recv_desc")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-c")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BDK_chng_desc")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("sync")]),a._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n\n$ bdk-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--network")]),a._v(" regtest wallet "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--node")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"127.0.0.1:18444"')]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--wallet")]),a._v(" bdk-test "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BDK_recv_desc")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-c")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BDK_chng_desc")]),a._v(" get_balance\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),a._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"satoshi"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[a._v("500000000")]),a._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n")])])]),e("p",[a._v("We can see "),e("code",[a._v("500000000")]),a._v(" sats balance in our "),e("code",[a._v("bdk-test")]),a._v(" wallet.")]),a._v(" "),e("p",[a._v("BDK has fetched blockchain details concerning its wallet descriptors, from the core node, using compact filters.")])])]),a._v(" "),e("h3",{attrs:{id:"creating-a-transaction"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#creating-a-transaction"}},[a._v("#")]),a._v(" Creating a transaction.")]),a._v(" "),e("p",[a._v("Now we want to create a transaction sending coins from "),e("code",[a._v("bdk-test")]),a._v(" wallet to the "),e("code",[a._v("core")]),a._v(" wallet.")]),a._v(" "),e("ul",[e("li",[e("p",[a._v("fetch a new "),e("code",[a._v("core")]),a._v(" address")]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[a._v("core_addrs")]),e("span",{pre:!0,attrs:{class:"token operator"}},[a._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$(")]),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("docker")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("exec")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-it")]),a._v(" bdk-box /root/bitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-regtest")]),a._v(" getnewaddress "),e("span",{pre:!0,attrs:{class:"token operator"}},[a._v("|")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token function"}},[a._v("tr")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v("'\\r'")]),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v(")")])]),a._v("\n")])])])]),a._v(" "),e("li",[e("p",[a._v("Create a raw transaction using "),e("code",[a._v("bdk-cli")]),a._v(" to the above address. This will generate a "),e("code",[a._v("psbt")]),a._v(" which we will sign.")]),a._v(" "),e("div",{staticClass:"language-shell extra-class"},[e("pre",{pre:!0,attrs:{class:"language-shell"}},[e("code",[a._v("$ "),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[a._v("psbt")]),e("span",{pre:!0,attrs:{class:"token operator"}},[a._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$(")]),a._v("bdk-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--network")]),a._v(" regtest wallet "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--node")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v('"127.0.0.1:18444"')]),a._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--wallet")]),a._v(" bdk-test "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" $BDK_recv_desc "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-c")]),a._v(" $BDK_chng_desc create_tx "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--to")]),a._v(" $core_addrs:200000000 "),e("span",{pre:!0,attrs:{class:"token operator"}},[a._v("|")]),a._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-r")]),a._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[a._v("'.psbt'")]),e("span",{pre:!0,attrs:{class:"token variable"}},[a._v(")")])]),a._v("\n")])])]),e("p",[a._v("(Recommended to check all the other information returned by "),e("code",[a._v("bdk-cli create_tx")]),a._v(")")])])]),a._v(" "),e("h3",{attrs:{id:"sign-and-broadcast-the-transaction"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#sign-and-broadcast-the-transaction"}},[a._v("#")]),a._v(" Sign and Broadcast the transaction")]),a._v(" "),e("p",[a._v("Asking BDK to sign a transaction is as straight forward as it can get. BDK already holds the "),e("code",[a._v("xprv")]),a._v(" deatils to sign a transaction. 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This demonstrates how BDK capabilities can be used to create SPV light wallets with integrated "),e("code",[a._v("BIP157")]),a._v(" type "),e("code",[a._v("compact_filters")]),a._v(" node.")])])}),[],!1,null,null,null);e.default=r.exports}}]); \ No newline at end of file diff --git a/assets/js/52.207765f4.js b/assets/js/52.17f4bae0.js similarity index 99% rename from assets/js/52.207765f4.js rename to assets/js/52.17f4bae0.js index 64cc7f879f..b0135ec725 100644 --- a/assets/js/52.207765f4.js +++ b/assets/js/52.17f4bae0.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[52],{404:function(t,s,a){"use strict";a.r(s);var n=a(7),e=Object(n.a)({},(function(){var t=this,s=t._self._c;return s("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[s("p",[s("a",{attrs:{href:"https://github.com/bitcoindevkit/rust-hwi",target:"_blank",rel:"noopener noreferrer"}},[t._v("bitcoindevkit/rust-hwi"),s("OutboundLink")],1),t._v(" is a sub-project for "),s("a",{attrs:{href:"https://bitcoindevkit.org/",target:"_blank",rel:"noopener noreferrer"}},[t._v("bitcoindevkit"),s("OutboundLink")],1),t._v(" (BDK) which is used to interact with hardware wallets using the Rust programming language. 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This function is equivalent to HWI's "),s("code",[t._v("enumerate")]),t._v(" function, which returns a list of connected devices. Here, "),s("code",[t._v("HWIClient::enumerate()")]),t._v(" returns a "),s("code",[t._v("Vec")]),t._v(", where "),s("code",[t._v("HWIDevice")]),t._v(" is a struct representing a single device and contains all the information related to it, for example, fingerprint, path, etc.")]),t._v(" "),s("p",[t._v("Then we store the first device available into "),s("code",[t._v("device")]),t._v(", which is straightforward. We then call "),s("code",[t._v("HWIClient::get_client()")]),t._v(" and pass the reference to the device info and the Chain we are going to use that device on. (the boolean is for setting "),s("code",[t._v("expert")]),t._v(" mode, which allows for some more functions and detailed information. 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-(window.webpackJsonp=window.webpackJsonp||[]).push([[54],{402: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("h2",{attrs:{id:"introduction"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#introduction"}},[t._v("#")]),t._v(" Introduction")]),t._v(" "),e("p",[t._v("To send people BTC - we simply scan a QR Code "),e("em",[t._v("(or paste an address)")]),t._v(", enter some amount and "),e("em",[t._v("whoosh")]),t._v(" - sent!\nUsers might think, just like traditional currency, we can only exchange money using Bitcoin.\nAs it so happens, the underlying technology Bitcoin supports specify outputs not as addresses, but as programming scripts.\nThis opens us to a world of possibilities using Bitcoin.")]),t._v(" "),e("h2",{attrs:{id:"script"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#script"}},[t._v("#")]),t._v(" Script")]),t._v(" "),e("p",[t._v("Bitcoin supports "),e("a",{attrs:{href:"https://en.bitcoin.it/wiki/Script",target:"_blank",rel:"noopener noreferrer"}},[t._v("Script"),e("OutboundLink")],1),t._v(", a "),e("strong",[t._v("stack-based")]),t._v(" lightweight programming language.\nAny script written in "),e("strong",[t._v("Script")]),t._v(" "),e("em",[t._v("(pun intended)")]),t._v(" contains "),e("code",[t._v("OP_*")]),t._v(" codes and raw byte arrays that Bitcoin Full Nodes understand and process.\nCurrently, there are "),e("code",[t._v("117")]),t._v(" op-codes in use.\nYou can read more about these op-codes straight "),e("a",{attrs:{href:"https://en.bitcoin.it/wiki/Script",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),e("OutboundLink")],1),t._v(".")]),t._v(" "),e("p",[t._v("Script is intentionally left "),e("a",{attrs:{href:"https://en.wikipedia.org/wiki/Turing_completeness",target:"_blank",rel:"noopener noreferrer"}},[t._v("Turing incomplete"),e("OutboundLink")],1),t._v(" which is why there is no "),e("a",{attrs:{href:"https://en.wikipedia.org/wiki/Halting_problem",target:"_blank",rel:"noopener noreferrer"}},[t._v("halting problem"),e("OutboundLink")],1),t._v(" with scripts.\nThere are no loops and overall, it's a very constrained programming language.")]),t._v(" "),e("p",[t._v("A transaction is considered valid only when the Script returns "),e("code",[t._v("true")]),t._v(" at the end of execution.\nOutput Script (aka scriptpubkey) define the conditions under which coins associated with them can be spent. To spend a particular coin implies finding an input script (aka scriptsig) such that a script made out of concatenation of "),e("code",[t._v("scriptsig + scriptpubkey")]),t._v(" evaluates to "),e("code",[t._v("true")]),t._v(".")]),t._v(" "),e("p",[t._v("For example, a basic legacy "),e("code",[t._v("Pay-to-PubKey-Hash")]),t._v(" transaction would look like:")]),t._v(" "),e("div",{staticClass:"language-script extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("scriptPubKey: OP_DUP OP_HASH160 OP_EQUALVERIFY OP_CHECKSIG\nscriptSig: \n")])])]),e("h4",{attrs:{id:"examples-of-things-achievable-using-bitcoin-script"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#examples-of-things-achievable-using-bitcoin-script"}},[t._v("#")]),t._v(" Examples of things achievable using Bitcoin Script:")]),t._v(" "),e("ol",[e("li",[e("code",[t._v("Pay Someone (p2pkh/p2wpkh)")]),t._v(" - A specific public key must sign to spend the coins.")]),t._v(" "),e("li",[e("code",[t._v("Escrow (2-of-3-multisig)")]),t._v(" - Two parties need to sign together to spend the coins.")]),t._v(" "),e("li",[e("code",[t._v("Vault (locked)")]),t._v(" - A specific key will not be able to spend the coins until a timeout but another master key will always be able to spend them.")]),t._v(" "),e("li",[e("code",[t._v("HTLC")]),t._v(" - The receiver needs disclose a secret before a timeout, else the coins are transferred back to the payee.")])]),t._v(" "),e("h4",{attrs:{id:"motivation-for-policies"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#motivation-for-policies"}},[t._v("#")]),t._v(" Motivation for Policies")]),t._v(" "),e("p",[t._v("Unfortunately, due to its low-level and unusual stack-based nature, Script is pretty hard to reason about and use.\nDespite being around since Bitcoin's creation, writing and understanding Script is not trivial.\nThis is why the scripts for the above few examples are pretty lengthy and might not make sense at the first glance.\nWhen writing a script, we would want to know that if the logic we wrote is "),e("strong",[t._v("correct")]),t._v(", "),e("strong",[t._v("optimal")]),t._v(" and "),e("strong",[t._v("efficient in size")]),t._v(" (use lower "),e("a",{attrs:{href:"https://en.bitcoin.it/wiki/Weight_units",target:"_blank",rel:"noopener noreferrer"}},[t._v("weight"),e("OutboundLink")],1),t._v(").")]),t._v(" "),e("p",[t._v("The community wanted an easy alternative way of writing Script that would create the most optimized Script code.\nThis gave rise to "),e("strong",[t._v("Miniscript")]),t._v(".")]),t._v(" "),e("h2",{attrs:{id:"miniscript"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#miniscript"}},[t._v("#")]),t._v(" Miniscript")]),t._v(" "),e("p",[e("a",{attrs:{href:"http://bitcoin.sipa.be/miniscript/",target:"_blank",rel:"noopener noreferrer"}},[t._v("Miniscript"),e("OutboundLink")],1),t._v(" tackles the above problems head-on.\nIt is an expressive way to create policies on Bitcoin Scripts in a structured and simple fashion.\nUsing Miniscript, it's difficult to go wrong.")]),t._v(" "),e("p",[t._v("Another very important goal of Miniscript is to replace any key used in a policy with another policy.\nThis is important because people might have multiple keys and complicated timelocks in their existing setup.\nWhile signing a new policy, they would want to use their existing setup to also generate addresses for this new setup.\nThis is accomplished using something called "),e("strong",[t._v("Output Descriptors")]),t._v(" which we will get into in next section.")]),t._v(" "),e("p",[t._v("Miniscript compiler compiles a "),e("strong",[t._v("spending policy")]),t._v(" down to Miniscript.\nIt doesn't contain any signature, it's mainly a combinator language for designing spending conditions.\nYou can try out the compiler online by using "),e("a",{attrs:{href:"http://bitcoin.sipa.be/miniscript/#:~:text=Policy%20to%20Miniscript%20compiler",target:"_blank",rel:"noopener noreferrer"}},[t._v("this link"),e("OutboundLink")],1),t._v(".")]),t._v(" "),e("h4",{attrs:{id:"fragments"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#fragments"}},[t._v("#")]),t._v(" Fragments")]),t._v(" "),e("p",[t._v("Here are some fragments which can be combined to create powerful expressions.")]),t._v(" "),e("ol",[e("li",[e("code",[t._v("pk(key)")]),t._v(" - Specifies a given public key")]),t._v(" "),e("li",[e("code",[t._v("thresh(k, expr_1, expr_2, ..., expr_n)")]),t._v(" - Specifies k of n multisig using expressions.")]),t._v(" "),e("li",[e("code",[t._v("older(T)")]),t._v(" - Timelock for T blocks")]),t._v(" "),e("li",[e("code",[t._v("and(expr_1, expr_2)")]),t._v(" - Both expressions should evaluate to true.")]),t._v(" "),e("li",[e("code",[t._v("or(expr_1, expr_2)")]),t._v(" - Any one of the expressions should evaluate to true.")]),t._v(" "),e("li",[e("code",[t._v("aor(expr_1, expr_2)")]),t._v(" - Similar to "),e("code",[t._v("or")]),t._v(" but "),e("code",[t._v("expr_1")]),t._v(" has a more probability to evaluate to true.")])]),t._v(" "),e("p",[t._v("Bitcoin Script allows us to use another alternate stack. The combinator functions use this second stack to evaluate expressions of "),e("code",[t._v("thresh")]),t._v(", "),e("code",[t._v("and")]),t._v(", "),e("code",[t._v("aor")]),t._v(" and "),e("code",[t._v("or")]),t._v(".\nThe complete Miniscript Reference can be found "),e("a",{attrs:{href:"http://bitcoin.sipa.be/miniscript/#:~:text=Miniscript%20reference",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),e("OutboundLink")],1),t._v(".")]),t._v(" "),e("h4",{attrs:{id:"example-policies"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#example-policies"}},[t._v("#")]),t._v(" Example Policies")]),t._v(" "),e("p",[t._v("Here are the Miniscript Policies for the examples we looked at earlier.\nNote "),e("code",[t._v("A")]),t._v(", "),e("code",[t._v("B")]),t._v(", "),e("code",[t._v("C")]),t._v(" are placeholders for keys "),e("em",[t._v("("),e("code",[t._v("xpub")]),t._v("/"),e("code",[t._v("xprv")]),t._v(")")]),t._v(" involved in the tx.\nDescriptors are high level description of scriptpubkey (p2pkh, p2sh etc).\nAnd miniscripts are semantics that describes the actual redeemscript.\nIn general you have Descriptor(Miniscript) format.")]),t._v(" "),e("ol",[e("li",[t._v("Pay A (pay-to-public-key)")])]),t._v(" "),e("div",{staticClass:"language- extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("pk(A)\n")])])]),e("ol",{attrs:{start:"2"}},[e("li",[t._v("Escrow Account between A, B and third-party C.")])]),t._v(" "),e("div",{staticClass:"language- extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("thresh(2,pk(A),pk(B),pk(C))\n")])])]),e("ol",{attrs:{start:"3"}},[e("li",[t._v("Vault for A time-locked for T blocks with B as the master key.")])]),t._v(" "),e("div",{staticClass:"language- extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("aor(and(pk(A),time(T)),pk(B))\n")])])]),e("ol",{attrs:{start:"4"}},[e("li",[t._v("HTLC payment to B, which, if unspent for T blocks, returns to A.")])]),t._v(" "),e("div",{staticClass:"language- extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("aor(and(pk(A),time(T)),and(pk(B),hash(H))))\n")])])]),e("p",[t._v("The Miniscript Policy Compiler is written in Rust and is present in "),e("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-miniscript",target:"_blank",rel:"noopener noreferrer"}},[t._v("this repository"),e("OutboundLink")],1),t._v(".\nIn this blog, we will later use the same using "),e("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk",target:"_blank",rel:"noopener noreferrer"}},[t._v("bitcoindevkit/bdk"),e("OutboundLink")],1),t._v(", a lightweight descriptor-based wallet library\nwith a "),e("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk-cli",target:"_blank",rel:"noopener noreferrer"}},[t._v("cli"),e("OutboundLink")],1),t._v(".")]),t._v(" "),e("h2",{attrs:{id:"descriptors"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#descriptors"}},[t._v("#")]),t._v(" Descriptors")]),t._v(" "),e("p",[t._v('The Bitcoin scriptpubkey supports various schemes like P2PKH, P2SH, P2WPKH, P2TR (Segwit v1) etc.\nA Descriptor is a simple "description" of what scriptpubkey to be used for a given policy.\nIt can inclue a single pubkey within itself, or an entire miniscript policy.\nOn the other hand, Miniscript policies are used to derive the redeemscript (the actual executable script), whereas the descriptor describes how the redeemscript will be encumbered within the scriptpubkey.')]),t._v(" "),e("p",[t._v('In other words, a descriptor "describes" the procedure to create an '),e("em",[t._v("address")]),t._v(", given a "),e("em",[t._v("spending condition")]),t._v(".")]),t._v(" "),e("p",[t._v("They make it easier to deal with Multisig or complicated key setups.\nDescriptors are super portable and can be easily used by any wallet to determine the list of all addresses that can be generated from the same.\nThis feature creates a common stage for all Bitcoin apps and software.")]),t._v(" "),e("p",[t._v("The concept of descriptor came into existence in 2018 and since then, a lot of wallets have added support for descriptors.\nYou can read the descriptor doc from "),e("code",[t._v("bitcoin-core")]),t._v(" "),e("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),e("OutboundLink")],1),t._v(".")]),t._v(" "),e("p",[t._v('According to Bitcoin Core, Output Descriptors are "a simple language which can be used to describe collections of output scripts".\nThey bring in themselves, derivation paths, master xpub/xprv fingerprints and paths to generate addresses from.\nLet\'s understand this with an example of an Output Descriptor:')]),t._v(" "),e("div",{staticClass:"language- extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("\nDescriptor: pkh([d34db33f/44'/0'/0']xpub6ERaJH[...]LJRcEL/1/*)#ml40v0wf\n <1> <--------2---------\x3e<----------3---------\x3e<4> <---5---\x3e\n\nSections:\n1 - address type specifier (here, describing P2PK type addresses)\n2 - master key fingerprint and derivation path from master\n3 - xpub at m/44'/0'/0\n4 - path to deriving keys/addresses at\n5 - checksum for the descriptor\n")])])]),e("p",[t._v("A descriptor have three parts:")]),t._v(" "),e("ul",[e("li",[e("em",[t._v("address type specifier")]),t._v(" (item 1) : describes the type of address created by this descriptor.")]),t._v(" "),e("li",[e("em",[t._v("policy")]),t._v(" : the spending condition that locks funds into this address.")]),t._v(" "),e("li",[e("em",[t._v("checksum")]),t._v(" : for quick verification.")])]),t._v(" "),e("p",[t._v("The address type specifiers currently supported are "),e("code",[t._v("pk")]),t._v(", "),e("code",[t._v("pkh")]),t._v(", "),e("code",[t._v("sh")]),t._v(", "),e("code",[t._v("wpkh")]),t._v(", "),e("code",[t._v("wsh")]),t._v(" for corresponding address type and recently added "),e("code",[t._v("tr")]),t._v(" for taproot addresses.")]),t._v(" "),e("p",[t._v("There is a special address specifier called "),e("code",[t._v("combo")]),t._v(" that creates addresses of all types from spending policy policy.")]),t._v(" "),e("p",[t._v("After the address specifier, comes the "),e("em",[t._v("policy")]),t._v(' that describes how the funds in the address can be spent. The descriptor\nabove in the example has a simple spending policy of "spend by the correct private key". There can be more complicated policies,\nand we will touch them in later sections.')]),t._v(" "),e("p",[e("code",[t._v("multi")]),t._v(" is a special keyword that can be used as both "),e("em",[t._v("address type")]),t._v(" and "),e("em",[t._v("policy")]),t._v(".\nWhen used as an "),e("em",[t._v("address type")]),t._v(" like "),e("code",[t._v("multi(...)")]),t._v(", it will create an address from the raw multisig scriptpubkey.\nWhile when used as a "),e("em",[t._v("policy")]),t._v(" like "),e("code",[t._v("wsh(multi(...))")]),t._v(" it will create that specific address type from the multisig script.\nOf course we cannot use "),e("code",[t._v("pk(multi(...))")]),t._v(", "),e("code",[t._v("pkh(multi(...))")]),t._v(" or "),e("code",[t._v("wpkh(multi(...))")]),t._v(", because these address types cannot hold scripts (any scripts) inside them.")]),t._v(" "),e("p",[t._v("For example a descriptor like "),e("code",[t._v("wsh(multi(2, PKA, PKB, PKC))")]),t._v(" describes a P2WSH type address created by a "),e("code",[t._v("2-of-3")]),t._v(" multisig\nscript using "),e("code",[t._v("PKA")]),t._v(", "),e("code",[t._v("PKB")]),t._v(" and "),e("code",[t._v("PKC")]),t._v(" pubkeys.")]),t._v(" "),e("h2",{attrs:{id:"where-it-all-comes-together"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#where-it-all-comes-together"}},[t._v("#")]),t._v(" Where it all comes together...")]),t._v(" "),e("p",[t._v("In this section, we are going to make a descriptor-based wallet and derive addresses from "),e("code",[t._v("bitcoin-cli")]),t._v(" and then use "),e("code",[t._v("bdk-cli")]),t._v(" to confirm that the addresses generated for descriptor wallets are deterministic for a given descriptor.")]),t._v(" "),e("p",[t._v("We will also try to create a vault miniscript policy and push funds to the vault with a lock time of 2 months.\nDuring this time, we will try to break our vault and see our transactions failing.")]),t._v(" "),e("h4",{attrs:{id:"tools-and-armor"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#tools-and-armor"}},[t._v("#")]),t._v(" Tools and Armor")]),t._v(" "),e("ul",[e("li",[e("a",{attrs:{href:"https://docs.docker.com/engine/install/",target:"_blank",rel:"noopener noreferrer"}},[t._v("docker"),e("OutboundLink")],1)]),t._v(" "),e("li",[e("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk-cli",target:"_blank",rel:"noopener noreferrer"}},[t._v("bdk-cli"),e("OutboundLink")],1)]),t._v(" "),e("li",[e("a",{attrs:{href:"https://bitcoindevkit.org/bdk-cli/compiler/#installation",target:"_blank",rel:"noopener noreferrer"}},[t._v("miniscriptc"),e("OutboundLink")],1)])]),t._v(" "),e("h4",{attrs:{id:"setting-up"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#setting-up"}},[t._v("#")]),t._v(" Setting Up")]),t._v(" "),e("p",[t._v("We require "),e("code",[t._v("bitcoind")]),t._v(" to run in "),e("code",[t._v("regtest")]),t._v(" mode. Use the following config file, or any other config\nthat you are familiar with.")]),t._v(" "),e("div",{staticClass:"language-txt extra-class"},[e("pre",{pre:!0,attrs:{class:"language-txt"}},[e("code",[t._v("regtest=1\nfallbackfee=0.0001\nserver=1\n\nrpcuser=user\nrpcpassword=password\n")])])]),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Start Bitcoin Core")]),t._v("\nbitcoind\n")])])]),e("h3",{attrs:{id:"keys-and-generating-addresses"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#keys-and-generating-addresses"}},[t._v("#")]),t._v(" Keys and Generating Addresses")]),t._v(" "),e("p",[t._v("Quick installation for "),e("code",[t._v("bdk-cli")]),t._v(" and "),e("code",[t._v("miniscriptc")]),t._v(":")]),t._v(" "),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[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("rpc,compiler\n"),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 "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--features")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"compiler"')]),t._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--example")]),t._v(" miniscriptc\n")])])]),e("p",[t._v("Let us first generate an XPRV and create the wpkh wallet descriptor")]),t._v(" "),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[e("code",[e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("XPRV")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("bdk-cli key generate "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("'.xprv'")]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("EX_DESC")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"wpkh('),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$XPRV")]),t._v("/86'/1'/0'/0/*)\"")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("EX_DESC_CS")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("elcli getdescriptorinfo $EX_DESC "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("'.checksum'")]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("EX_DESC")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$EX_DESC")]),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("#$EX_DESC_CS")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Set this descriptor in a wallet in bitcoin-cli")]),t._v("\nbitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-named")]),t._v(" createwallet "),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("wallet_name")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"mywallet"')]),t._v(" "),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("descriptors")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("true\nbitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-rpcwallet")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"mywallet"')]),t._v(" importdescriptors "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"[{'),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v("desc"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v(":"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$EX_DESC")]),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v(", "),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v("timestamp"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v(":"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v("now"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v(", "),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v("active"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v(": true, "),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v("range"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v(': [0,100]}]"')]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("echo")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$EX_DESC")]),t._v("\n")])])]),e("p",[t._v("It should look something like this:")]),t._v(" "),e("div",{staticClass:"language- extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("wpkh(tprv8ZgxMBicQKsPeuazF16EdPZw84eHj55AU8ZKgZgdhu3sXcHnFgjzskfDvZdTaAFHYNCbKqrurFo9onSaT7zGT1i3u3j7LKhVZF5sJA39WPN/86'/1'/0'/0/*)#40hv8z77\n")])])]),e("p",[t._v("Now, we will generate 10 addresses using "),e("code",[t._v("bitcoin-cli")]),t._v(" and thereafter "),e("code",[t._v("bdk-cli")]),t._v(" using this above descriptor.\nNotice how both of them output the same set of addresses.")]),t._v(" "),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Generation via bdk-cli")]),t._v("\nrepeat "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("10")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v(" bdk-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-n")]),t._v(" regtest wallet "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--descriptor")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$EX_DESC")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-w")]),t._v(" mywallet get_new_address "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".address"')]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nbcrt1qc9wzxf8pthyexl00m23ug92pqrthagnzzf33wp\nbcrt1qgnh7e72q92fqujwg3qxlg5kplxkm6rep0nerur\nbcrt1qea6r8yvd0peupk29p94wm0xasvydgdsnyzkhez\nbcrt1qm99230tpqflq0f8kpkn5d2tee02hgqcsw5sd99\nbcrt1qd0afjfnl5udrsfkrj72rl34pss34yluma752qv\nbcrt1qj2aymplrzxcp4m7vcxrzq93g58pmgm4fpluesy\nbcrt1q4p4k63xglftez0h8yc7d4kmhsn5j5kecguu34j\nbcrt1q29z2uanskweur7qrzr43gyv3l028s0pnd9ptvp\nbcrt1qkzpeqz8sd73sucfythjxftez0e3ee30yhp9w67\nbcrt1qptwd6ggy8ttryck2f6yjf4la68apruc3fs7elz\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Generation via bitcoin-cli")]),t._v("\nrepeat "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("10")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v(" bitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-rpcwallet")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"mywallet"')]),t._v(" getnewaddress "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nbcrt1qc9wzxf8pthyexl00m23ug92pqrthagnzzf33wp\nbcrt1qgnh7e72q92fqujwg3qxlg5kplxkm6rep0nerur\nbcrt1qea6r8yvd0peupk29p94wm0xasvydgdsnyzkhez\nbcrt1qm99230tpqflq0f8kpkn5d2tee02hgqcsw5sd99\nbcrt1qd0afjfnl5udrsfkrj72rl34pss34yluma752qv\nbcrt1qj2aymplrzxcp4m7vcxrzq93g58pmgm4fpluesy\nbcrt1q4p4k63xglftez0h8yc7d4kmhsn5j5kecguu34j\nbcrt1q29z2uanskweur7qrzr43gyv3l028s0pnd9ptvp\nbcrt1qkzpeqz8sd73sucfythjxftez0e3ee30yhp9w67\nbcrt1qptwd6ggy8ttryck2f6yjf4la68apruc3fs7elz\n")])])]),e("p",[t._v("Notes:")]),t._v(" "),e("ul",[e("li",[t._v("The "),e("code",[t._v("repeat n {}")]),t._v(" syntax will only work in "),e("code",[t._v("zsh")]),t._v(", you can use other loops for your shell, or just manually repeat the code 10 times.")]),t._v(" "),e("li",[t._v("In case you get different outputs in either of the cases, try deleting "),e("code",[t._v("~/.bdk-bitcoin")]),t._v(" and retrying (thanks "),e("a",{attrs:{href:"https://twitter.com/notmandatory",target:"_blank",rel:"noopener noreferrer"}},[t._v("@Steve"),e("OutboundLink")],1),t._v(" for this tip!)")])]),t._v(" "),e("p",[t._v("Note that both "),e("code",[t._v("bdk-cli")]),t._v(" and "),e("code",[t._v("bitcoin-cli")]),t._v(" produced the exact same addresses. So now we have definitive proof that descriptors can make wallets portable. That single string will be able to make any wallet generate the same set of addresses and hence they can sync and broadcast transactions in the same manner!")]),t._v(" "),e("h3",{attrs:{id:"making-a-multisig-descriptor-for-funds"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#making-a-multisig-descriptor-for-funds"}},[t._v("#")]),t._v(" Making a MultiSig Descriptor for Funds")]),t._v(" "),e("p",[t._v("In the real-life, most of us hold two kinds of savings accounts - one to store huge funds saved throughout our lifetime "),e("em",[t._v("(probably without internet banking functionalities)")]),t._v("\nand another for regular expenses.")]),t._v(" "),e("p",[t._v("In the Bitcoin world, to store huge funds, most people prefer to use a Multisig descriptor with a "),e("code",[t._v("2-of-3")]),t._v(" or "),e("code",[t._v("3-of-4")]),t._v(" setup.\nThey can have one key stored in their PC, one key stored in a hardware wallet, one key stored in writing in a secure vault and another key learnt by heart.\nIn case of a mishap like a house burning on fire or permanent memory loss, they would still be able to recover their funds by using the other keys.")]),t._v(" "),e("p",[t._v("Here's how a secure "),e("code",[t._v("2-of-3")]),t._v(" descriptor generation would look like:")]),t._v(" "),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# xprv generation")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("K1_XPRV")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("bdk-cli key generate "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token 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"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".xprv"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# xpub generation")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("K1_XPUB")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("bdk-cli key derive "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--xprv")]),t._v(" $K1_XPRV "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--path")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("\"m/84'/1'/0'/0\"")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token 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"),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".xpub"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("K3_XPUB")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("bdk-cli key derive "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--xprv")]),t._v(" $K3_XPRV "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--path")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("\"m/84'/1'/0'/0\"")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".xpub"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Descriptors for each key - Since we used BIP-84 generation paths for xpubs,")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# we need to append the same to the xprvs so that our wallet can understand ")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# which path to generate addresses and xpubs from")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("K1_DESC")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"wsh(multi(2,'),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$K1_XPRV")]),t._v("/84'/1'/0'/0/*,"),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$K2_XPUB")]),t._v(","),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$K3_XPUB")]),t._v('))"')]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("K2_DESC")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"wsh(multi(2,'),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$K1_XPUB")]),t._v(","),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$K2_XPRV")]),t._v("/84'/1'/0'/0/*,"),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$K3_XPUB")]),t._v('))"')]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("K3_DESC")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"wsh(multi(2,'),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$K1_XPUB")]),t._v(","),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$K2_XPUB")]),t._v(","),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$K3_XPRV")]),t._v("/84'/1'/0'/0/*))\"")]),t._v("\n")])])]),e("p",[t._v("Lets create three bdk wallets aliases with above descriptors for easy future use\nand do initial sync to create the wallet files")]),t._v(" "),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[e("code",[e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("alias")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("k1wallet")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("'bdk-cli -n regtest wallet -w K1 -d $K1_DESC'")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("alias")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("k2wallet")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("'bdk-cli -n regtest wallet -w K2 -d $K2_DESC'")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("alias")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("k3wallet")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("'bdk-cli -n regtest wallet -w K3 -d $K3_DESC'")]),t._v("\n\nk1wallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nk2wallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nk3wallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("p",[t._v("Now, let us send some funds to an address generated by "),e("code",[t._v("k1wallet")]),t._v(".")]),t._v(" "),e("div",{staticClass:"language- extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v('# ask regtest to generate 101 blocks, so we get 50 regtest coins to play with.\n# because coinbase amounts are only spendable after 100 blocks, we generate\n# 101 blocks, to use the first block\'s coinbase amount.\nCORE_ADDR=$(bitcoin-cli getnewaddress)\nbitcoin-cli generatetoaddress 101 $CORE_ADDR\nbitcoin-cli getbalance\n50.00000000\n\n# And then send 10 btc to an address generated by `K1` descriptor\nBDK_ADDR=$(k1wallet get_new_address | jq -r ".address")\nbitcoin-cli -rpcwallet=mywallet sendtoaddress $BDK_ADDR 10\n\n# Confirm the transaction by creating one more block\nbitcoin-cli generatetoaddress 1 $CORE_ADDR\n')])])]),e("p",[t._v("Now sync the wallets and check balances in each")]),t._v(" "),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[e("code",[t._v("k1wallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nk1wallet get_balance\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"satoshi"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("1000000000")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\nk2wallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nk2wallet get_balance\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"satoshi"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("1000000000")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\nk3wallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nk3wallet get_balance\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"satoshi"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("1000000000")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("p",[t._v("Everyone has the same amount of balance.\nThis happened because it was a multisig wallet.\nNow, let's try to spend some balance.\nWe will give back some balance to the wallet maintained by "),e("code",[t._v("bitcoin-cli")]),t._v(".\nBut remember, this is a "),e("code",[t._v("2-of-3")]),t._v(" multisig wallet.\nThat's why we will need at least two keys to sign to make a transaction.")]),t._v(" "),e("p",[t._v("Here's where we will require to use a "),e("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0174.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[t._v("PSBT"),e("OutboundLink")],1),t._v(" or a "),e("em",[t._v("partially signed bitcoin transaction")]),t._v(".\nBitcoin uses PSBTs as the standard protocol to create a transaction and add one or more signatures to it before broadcasting the same to\nthe network which finally can become a proper valid "),e("em",[t._v("transaction")]),t._v(".")]),t._v(" "),e("p",[t._v("We will aks "),e("code",[t._v("k2wallet")]),t._v(" to create and sign the transaction then "),e("code",[t._v("k1wallet")]),t._v(" and "),e("code",[t._v("k3wallet")]),t._v(" will co-sign it.\nNote that "),e("code",[t._v("k2wallet")]),t._v(" even if it creates the transaction, doesn't need to sign it, because its a "),e("code",[t._v("2-of-3")]),t._v(" multisig!")]),t._v(" "),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# create the transaction, can be started by anyone")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("PSBT")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("k2wallet create_tx "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--to")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"'),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$CORE_ADDR")]),t._v(':100000000"')]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".psbt"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Sign the transaction by K1 and look at the output")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# it should say the psbt is not finalized since only one party has signed")]),t._v("\nk1wallet sign "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--psbt")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$PSBT")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"is_finalized"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" false,\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"psbt"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),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("# Saving the PSBT signed by K1")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("K1_SIGNED_PSBT")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("k1wallet sign "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--psbt")]),t._v(" $PSBT "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".psbt"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Sign by K3 - should be finalized this time")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Notice that this time, the input psbt was the signed PSBT of K1")]),t._v("\nk3wallet sign "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--psbt")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$K1_SIGNED_PSBT")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"is_finalized"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" true,\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"psbt"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),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("# Saving the PSBT signed by K3")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("SIGNED_PSBT")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("k3wallet sign "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--psbt")]),t._v(" $K1_SIGNED_PSBT "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".psbt"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Broadcast the transaction, again doesn't really matter who broadcasts")]),t._v("\nk2wallet broadcast "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--psbt")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$SIGNED_PSBT")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"txid"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"49e2706fc73c49605692bf1b9ce58baf1eb0307ea39b3118628994fd56c9b642"')]),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("# Confirm the transaction by generating one block")]),t._v("\nbitcoin-cli generatetoaddress "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("1")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$CORE_ADDR")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Sync and check balance - it should have gone down by 100000000 + tx fees")]),t._v("\nk1wallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\nk1wallet get_balance\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"satoshi"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("899999810")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Check similarly for `k2wallet` and `k3wallet` and they should all have same balance")]),t._v("\n")])])]),e("p",[t._v("So this proves we can definitely do transactions with multisig wallets with complicated descriptors.\nSince for Bitcoin, having keys equal having access to the accounts, we need to keep our keys safe.\nFor legacy single key wallets, we used to keep backups of the mnemonic codes in multiple places.\nIt was pretty insecure because in case any one of those backups leaks, our entire account would be compromised.\nComplicated multisig wallet descriptors are definitely a step forward - just in case a single key leak or are lost, no one would be able to take charge of the funds we hold.")]),t._v(" "),e("p",[t._v("Another problem with multisig was syncing between wallets to always create consistent addresses. How would\none wallet know whats the next address to create without talking to other wallets? The answer is "),e("code",[t._v("descriptors + PSBT")]),t._v(".\nIf all the wallet shares the correct descriptor string they will always create the exact sequence of addresses and\nby passing around PSBTs they would know how to sign them, without talking to each other. This solves a major problem of multisig interoperability. And BDK makes this process as seamless as possible.")]),t._v(" "),e("h2",{attrs:{id:"retention-bonus-smart-contract-with-bitcoin"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#retention-bonus-smart-contract-with-bitcoin"}},[t._v("#")]),t._v(" Retention Bonus - Smart Contract with Bitcoin")]),t._v(" "),e("p",[t._v("Let us consider that a company wants to give its employees a retention bonus for two months.\nIf an employee stays with that company for over 2 months, the employee would get 1 BTC as a reward.\nThis would be a smart contract between the company and an employee.\nThe employee should be able to see that he would get his funds after two months.\nThe company would require confidence that the employee would not be able to withdraw the reward before two months have passed.")]),t._v(" "),e("p",[t._v("The Miniscript policy for this contract would be as follows:")]),t._v(" "),e("div",{staticClass:"language- extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("or(99@and(pk(E),older(8640)),pk(C))\n")])])]),e("p",[t._v("where "),e("code",[t._v("E")]),t._v(" is the employee and "),e("code",[t._v("C")]),t._v(" is the company.")]),t._v(" "),e("p",[t._v("I should emphasize over here that this policy will let the company still transfer funds after the designated 2 months.\nIt's not possible to block them after the lock time has passed, atleast not in a single policy.")]),t._v(" "),e("p",[t._v("Surely, after two months, the funds can be unlocked by the employee but before that, the company can revoke the funds.\nLet us compile this policy down to a descriptor. And this time we will ask help from the "),e("code",[t._v("miniscript")]),t._v(" program.")]),t._v(" "),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# The Descriptor will be on the log, the E and C are placeholders")]),t._v("\nminiscriptc "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"or(99@and(pk(E),older(8640)),pk(C))"')]),t._v(" sh-wsh\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("2021")]),t._v("-08-05T12:25:40Z INFO miniscriptc"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" Compiling policy: or"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("99")]),t._v("@and"),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("E"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(",older"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("8640")]),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("C"),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 number"}},[t._v("2021")]),t._v("-08-05T12:25:40Z INFO miniscriptc"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("..")]),t._v(". Descriptor: sh"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("wsh"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("andor"),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("E"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(",older"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("8640")]),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("C"),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 comment"}},[t._v("#55wzucxa")]),t._v("\nError: Descriptor"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("Miniscript"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("Unexpected"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Key too short (<66 char), doesn\'t match any format"')]),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("So the compiled descriptor is")]),t._v(" "),e("div",{staticClass:"language- extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("sh(wsh(andor(pk(E),older(8640),pk(C))))\n")])])]),e("p",[t._v("Let's make the keys, generate addresses using the above descriptor and fund it.")]),t._v(" "),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# xprvs")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("E_XPRV")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("bdk-cli key generate "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".xprv"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("C_XPRV")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("bdk-cli key generate "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".xprv"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# xpubs")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("E_XPUB")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("bdk-cli key derive "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--xprv")]),t._v(" $E_XPRV "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--path")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("\"m/84'/1'/0'/0\"")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".xpub"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("C_XPUB")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("bdk-cli key derive "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--xprv")]),t._v(" $C_XPRV "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--path")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("\"m/84'/1'/0'/0\"")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".xpub"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# descriptors using the compiled miniscript")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# please note in case company or the employee was using a complicated multisig descriptor,")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# it may as well have been added here like we did in the example before")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("E_DESC")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"sh(wsh(andor(pk('),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$E_XPRV")]),t._v("/84'/1'/0'/0/*),older(8640),pk("),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$C_XPUB")]),t._v('))))"')]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("C_DESC")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"sh(wsh(andor(pk('),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$E_XPUB")]),t._v("),older(8640),pk("),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$C_XPRV")]),t._v("/84'/1'/0'/0/*))))\"")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Create wallet aliases for easy access and sync the wallet to create initial wallet files")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("alias")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("Cwallet")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("'bdk-cli -n regtest wallet -w C -d $C_DESC'")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("alias")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("Ewallet")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("'bdk-cli -n regtest wallet -w E -d $E_DESC'")]),t._v("\n\nCwallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nEwallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# get some funds in Cwallet's address")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("C_ADDR")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("Cwallet get_new_address "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".address"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\nbitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-rpcwallet")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("mywallet sendtoaddress "),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$C_ADDR")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("10")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Confirm the transaction")]),t._v("\nbitcoin-cli generatetoaddress "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("1")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$CORE_ADDR")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Sync and check balance")]),t._v("\nCwallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nCwallet get_balance\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"satoshi"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("1000000000")]),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("# Just as before, the employe can also see the fund in their wallet")]),t._v("\nEwallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nEwallet get_balance\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"satoshi"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("1000000000")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("p",[t._v("According to the spending policy, for "),e("code",[t._v("E")]),t._v(" has to wait for 8640 blocks before he can spend the coins.\nBut let's check what happens if "),e("code",[t._v("E")]),t._v(" tries to transact before the designated 2 months anyway.")]),t._v(" "),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# address to send the transaction to")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("E_ADDR")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("Ewallet getnewaddress "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".address"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# get external_policy id - this identifies which policy the wallet will try to sign against")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("POLICY_ID")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("Ewallet policies "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".external | .id"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# create the tx (external_policy id from last step in my case is j7ncy3au")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("PSBT")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("Ewallet create_tx "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--to")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"'),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$E_ADDR")]),t._v(':100000000"')]),t._v(" "),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('\\"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$POLICY_ID")]),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v(':[0]}"')]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".psbt"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# sign and save the signed psbt")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("SIGNED_PSBT")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("Ewallet sign "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--psbt")]),t._v(" $PSBT "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".psbt"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# now let's try to broadcast - and see it failing")]),t._v("\nEwallet broadcast "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--psbt")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$SIGNED_PSBT")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("2021")]),t._v("-08-05T17:48:45Z ERROR bdk_cli"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" Electrum"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("Protocol"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("Object"),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 string"}},[t._v('"code"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" Number"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("2")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(", "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"message"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" String"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"sendrawtransaction RPC error: {'),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v("code"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v(":-26,"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v("message"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v(":"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v("non-BIP68-final"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),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("))")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),e("p",[t._v("We get an error saying the transaction we sent is "),e("strong",[t._v("Not BIP68 Final")]),t._v(".\n"),e("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0068.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[t._v("BIP68"),e("OutboundLink")],1),t._v(" is a relative lock-time specification that ensures consensus when a signed transaction is sent which is invalid at a given time because the lock time isn't passed.\nSo that's an expected error.")]),t._v(" "),e("p",[t._v("Now let's simulate two months passing and retry.")]),t._v(" "),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# simulate two months")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# this will take around 1 mins to complete")]),t._v("\nbitcoin-cli generatetoaddress "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("8640")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$CORE_ADDR")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# create, sign and broadcast tx")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("PSBT")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("Ewallet create_tx "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--to")]),t._v(" $E_ADDR:100000000 "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--external_policy")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"{'),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$POLICY_ID")]),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v(':[0]}"')]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".psbt"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("SIGNED_PSBT")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("Ewallet sign "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--psbt")]),t._v(" $PSBT "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".psbt"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\nEwallet broadcast "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--psbt")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$SIGNED_PSBT")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"txid"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"2a0919bb3ce6e26018698ad1169965301a9ceab6d3da2a3dcb41343dc48e0dba"')]),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("# Confirm the transaction")]),t._v("\nbitcoin-cli generatetoaddress "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("1")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$CORE_ADDR")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Sync and check balances")]),t._v("\nCwallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nCwallet get_balance\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"satoshi"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("999999810")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\nEwallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nEwallet get_balance\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"satoshi"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("999999810")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("p",[t._v("So this time it worked, because we have simulated 2 months passing by generating 8640 blocks. And both the Company\nand Employe wallet gets updated.\nHence, we saw that we can generate some smart contracts using Bitcoin.")]),t._v(" "),e("h2",{attrs:{id:"inspirations"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#inspirations"}},[t._v("#")]),t._v(" Inspirations")]),t._v(" "),e("ol",[e("li",[e("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md",target:"_blank",rel:"noopener noreferrer"}},[t._v("Descriptors from Bitcoin Core"),e("OutboundLink")],1)]),t._v(" "),e("li",[e("a",{attrs:{href:"http://bitcoin.sipa.be/miniscript",target:"_blank",rel:"noopener noreferrer"}},[t._v("Miniscript"),e("OutboundLink")],1)]),t._v(" "),e("li",[e("a",{attrs:{href:"https://bitcoinops.org/en/topics/output-script-descriptors",target:"_blank",rel:"noopener noreferrer"}},[t._v("Output Script Descriptors"),e("OutboundLink")],1)]),t._v(" "),e("li",[e("a",{attrs:{href:"https://bitcoindevkit.org/descriptors",target:"_blank",rel:"noopener noreferrer"}},[t._v("Descriptors in Bitcoin Dev Kit"),e("OutboundLink")],1)]),t._v(" "),e("li",[e("a",{attrs:{href:"https://bitcoindevkit.org/blog/2020/11/descriptors-in-the-wild/#the-role-of-descriptors",target:"_blank",rel:"noopener noreferrer"}},[t._v("Role of Descriptors"),e("OutboundLink")],1)]),t._v(" "),e("li",[e("a",{attrs:{href:"https://gist.github.com/notmandatory/483c7edd098550c235da75d5babcf255",target:"_blank",rel:"noopener noreferrer"}},[t._v("Making a Taproot Descriptor Wallet using bitcoin-cli"),e("OutboundLink")],1)]),t._v(" "),e("li",[e("a",{attrs:{href:"https://www.youtube.com/watch?v=XM1lzN4Zfks",target:"_blank",rel:"noopener noreferrer"}},[t._v("Miniscripts SBC '19 - Video"),e("OutboundLink")],1)]),t._v(" "),e("li",[e("a",{attrs:{href:"https://www.youtube.com/watch?v=xC25NzIjzog",target:"_blank",rel:"noopener noreferrer"}},[t._v("Rethinking Wallet Architecture: Native Descriptor Wallets - Video"),e("OutboundLink")],1)])]),t._v(" "),e("p",[t._v("Special thanks to my mentor "),e("a",{attrs:{href:"https://twitter.com/notmandatory",target:"_blank",rel:"noopener noreferrer"}},[t._v("Steve Myers"),e("OutboundLink")],1),t._v(" for the constant motivation and support he gave me and for clearing so many doubts!\nImmense thanks to "),e("a",{attrs:{href:"https://github.com/rajarshimaitra",target:"_blank",rel:"noopener noreferrer"}},[t._v("Raj"),e("OutboundLink")],1),t._v(" for reviewing this blog and giving such detailed suggestions.\nMany of the lines added here are his.\nAlso, thanks to the folks at the "),e("code",[t._v("#miniscript")]),t._v(" IRC channel to help me out with the Retention Bonus policy.")]),t._v(" "),e("p",[t._v("This blog was written during "),e("a",{attrs:{href:"https://summerofbitcoin.org",target:"_blank",rel:"noopener noreferrer"}},[t._v("Summer of Bitcoin 2021"),e("OutboundLink")],1),t._v(" by "),e("a",{attrs:{href:"https://twitter.com/@sandipndev",target:"_blank",rel:"noopener noreferrer"}},[t._v("Sandipan Dey"),e("OutboundLink")],1),t._v(".")])])}),[],!1,null,null,null);e.default=n.exports}}]); \ No newline at end of file +(window.webpackJsonp=window.webpackJsonp||[]).push([[54],{404: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("h2",{attrs:{id:"introduction"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#introduction"}},[t._v("#")]),t._v(" Introduction")]),t._v(" "),e("p",[t._v("To send people BTC - we simply scan a QR Code "),e("em",[t._v("(or paste an address)")]),t._v(", enter some amount and "),e("em",[t._v("whoosh")]),t._v(" - sent!\nUsers might think, just like traditional currency, we can only exchange money using Bitcoin.\nAs it so happens, the underlying technology Bitcoin supports specify outputs not as addresses, but as programming scripts.\nThis opens us to a world of possibilities using Bitcoin.")]),t._v(" "),e("h2",{attrs:{id:"script"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#script"}},[t._v("#")]),t._v(" Script")]),t._v(" "),e("p",[t._v("Bitcoin supports "),e("a",{attrs:{href:"https://en.bitcoin.it/wiki/Script",target:"_blank",rel:"noopener noreferrer"}},[t._v("Script"),e("OutboundLink")],1),t._v(", a "),e("strong",[t._v("stack-based")]),t._v(" lightweight programming language.\nAny script written in "),e("strong",[t._v("Script")]),t._v(" "),e("em",[t._v("(pun intended)")]),t._v(" contains "),e("code",[t._v("OP_*")]),t._v(" codes and raw byte arrays that Bitcoin Full Nodes understand and process.\nCurrently, there are "),e("code",[t._v("117")]),t._v(" op-codes in use.\nYou can read more about these op-codes straight "),e("a",{attrs:{href:"https://en.bitcoin.it/wiki/Script",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),e("OutboundLink")],1),t._v(".")]),t._v(" "),e("p",[t._v("Script is intentionally left "),e("a",{attrs:{href:"https://en.wikipedia.org/wiki/Turing_completeness",target:"_blank",rel:"noopener noreferrer"}},[t._v("Turing incomplete"),e("OutboundLink")],1),t._v(" which is why there is no "),e("a",{attrs:{href:"https://en.wikipedia.org/wiki/Halting_problem",target:"_blank",rel:"noopener noreferrer"}},[t._v("halting problem"),e("OutboundLink")],1),t._v(" with scripts.\nThere are no loops and overall, it's a very constrained programming language.")]),t._v(" "),e("p",[t._v("A transaction is considered valid only when the Script returns "),e("code",[t._v("true")]),t._v(" at the end of execution.\nOutput Script (aka scriptpubkey) define the conditions under which coins associated with them can be spent. To spend a particular coin implies finding an input script (aka scriptsig) such that a script made out of concatenation of "),e("code",[t._v("scriptsig + scriptpubkey")]),t._v(" evaluates to "),e("code",[t._v("true")]),t._v(".")]),t._v(" "),e("p",[t._v("For example, a basic legacy "),e("code",[t._v("Pay-to-PubKey-Hash")]),t._v(" transaction would look like:")]),t._v(" "),e("div",{staticClass:"language-script extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("scriptPubKey: OP_DUP OP_HASH160 OP_EQUALVERIFY OP_CHECKSIG\nscriptSig: \n")])])]),e("h4",{attrs:{id:"examples-of-things-achievable-using-bitcoin-script"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#examples-of-things-achievable-using-bitcoin-script"}},[t._v("#")]),t._v(" Examples of things achievable using Bitcoin Script:")]),t._v(" "),e("ol",[e("li",[e("code",[t._v("Pay Someone (p2pkh/p2wpkh)")]),t._v(" - A specific public key must sign to spend the coins.")]),t._v(" "),e("li",[e("code",[t._v("Escrow (2-of-3-multisig)")]),t._v(" - Two parties need to sign together to spend the coins.")]),t._v(" "),e("li",[e("code",[t._v("Vault (locked)")]),t._v(" - A specific key will not be able to spend the coins until a timeout but another master key will always be able to spend them.")]),t._v(" "),e("li",[e("code",[t._v("HTLC")]),t._v(" - The receiver needs disclose a secret before a timeout, else the coins are transferred back to the payee.")])]),t._v(" "),e("h4",{attrs:{id:"motivation-for-policies"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#motivation-for-policies"}},[t._v("#")]),t._v(" Motivation for Policies")]),t._v(" "),e("p",[t._v("Unfortunately, due to its low-level and unusual stack-based nature, Script is pretty hard to reason about and use.\nDespite being around since Bitcoin's creation, writing and understanding Script is not trivial.\nThis is why the scripts for the above few examples are pretty lengthy and might not make sense at the first glance.\nWhen writing a script, we would want to know that if the logic we wrote is "),e("strong",[t._v("correct")]),t._v(", "),e("strong",[t._v("optimal")]),t._v(" and "),e("strong",[t._v("efficient in size")]),t._v(" (use lower "),e("a",{attrs:{href:"https://en.bitcoin.it/wiki/Weight_units",target:"_blank",rel:"noopener noreferrer"}},[t._v("weight"),e("OutboundLink")],1),t._v(").")]),t._v(" "),e("p",[t._v("The community wanted an easy alternative way of writing Script that would create the most optimized Script code.\nThis gave rise to "),e("strong",[t._v("Miniscript")]),t._v(".")]),t._v(" "),e("h2",{attrs:{id:"miniscript"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#miniscript"}},[t._v("#")]),t._v(" Miniscript")]),t._v(" "),e("p",[e("a",{attrs:{href:"http://bitcoin.sipa.be/miniscript/",target:"_blank",rel:"noopener noreferrer"}},[t._v("Miniscript"),e("OutboundLink")],1),t._v(" tackles the above problems head-on.\nIt is an expressive way to create policies on Bitcoin Scripts in a structured and simple fashion.\nUsing Miniscript, it's difficult to go wrong.")]),t._v(" "),e("p",[t._v("Another very important goal of Miniscript is to replace any key used in a policy with another policy.\nThis is important because people might have multiple keys and complicated timelocks in their existing setup.\nWhile signing a new policy, they would want to use their existing setup to also generate addresses for this new setup.\nThis is accomplished using something called "),e("strong",[t._v("Output Descriptors")]),t._v(" which we will get into in next section.")]),t._v(" "),e("p",[t._v("Miniscript compiler compiles a "),e("strong",[t._v("spending policy")]),t._v(" down to Miniscript.\nIt doesn't contain any signature, it's mainly a combinator language for designing spending conditions.\nYou can try out the compiler online by using "),e("a",{attrs:{href:"http://bitcoin.sipa.be/miniscript/#:~:text=Policy%20to%20Miniscript%20compiler",target:"_blank",rel:"noopener noreferrer"}},[t._v("this link"),e("OutboundLink")],1),t._v(".")]),t._v(" "),e("h4",{attrs:{id:"fragments"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#fragments"}},[t._v("#")]),t._v(" Fragments")]),t._v(" "),e("p",[t._v("Here are some fragments which can be combined to create powerful expressions.")]),t._v(" "),e("ol",[e("li",[e("code",[t._v("pk(key)")]),t._v(" - Specifies a given public key")]),t._v(" "),e("li",[e("code",[t._v("thresh(k, expr_1, expr_2, ..., expr_n)")]),t._v(" - Specifies k of n multisig using expressions.")]),t._v(" "),e("li",[e("code",[t._v("older(T)")]),t._v(" - Timelock for T blocks")]),t._v(" "),e("li",[e("code",[t._v("and(expr_1, expr_2)")]),t._v(" - Both expressions should evaluate to true.")]),t._v(" "),e("li",[e("code",[t._v("or(expr_1, expr_2)")]),t._v(" - Any one of the expressions should evaluate to true.")]),t._v(" "),e("li",[e("code",[t._v("aor(expr_1, expr_2)")]),t._v(" - Similar to "),e("code",[t._v("or")]),t._v(" but "),e("code",[t._v("expr_1")]),t._v(" has a more probability to evaluate to true.")])]),t._v(" "),e("p",[t._v("Bitcoin Script allows us to use another alternate stack. The combinator functions use this second stack to evaluate expressions of "),e("code",[t._v("thresh")]),t._v(", "),e("code",[t._v("and")]),t._v(", "),e("code",[t._v("aor")]),t._v(" and "),e("code",[t._v("or")]),t._v(".\nThe complete Miniscript Reference can be found "),e("a",{attrs:{href:"http://bitcoin.sipa.be/miniscript/#:~:text=Miniscript%20reference",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),e("OutboundLink")],1),t._v(".")]),t._v(" "),e("h4",{attrs:{id:"example-policies"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#example-policies"}},[t._v("#")]),t._v(" Example Policies")]),t._v(" "),e("p",[t._v("Here are the Miniscript Policies for the examples we looked at earlier.\nNote "),e("code",[t._v("A")]),t._v(", "),e("code",[t._v("B")]),t._v(", "),e("code",[t._v("C")]),t._v(" are placeholders for keys "),e("em",[t._v("("),e("code",[t._v("xpub")]),t._v("/"),e("code",[t._v("xprv")]),t._v(")")]),t._v(" involved in the tx.\nDescriptors are high level description of scriptpubkey (p2pkh, p2sh etc).\nAnd miniscripts are semantics that describes the actual redeemscript.\nIn general you have Descriptor(Miniscript) format.")]),t._v(" "),e("ol",[e("li",[t._v("Pay A (pay-to-public-key)")])]),t._v(" "),e("div",{staticClass:"language- extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("pk(A)\n")])])]),e("ol",{attrs:{start:"2"}},[e("li",[t._v("Escrow Account between A, B and third-party C.")])]),t._v(" "),e("div",{staticClass:"language- extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("thresh(2,pk(A),pk(B),pk(C))\n")])])]),e("ol",{attrs:{start:"3"}},[e("li",[t._v("Vault for A time-locked for T blocks with B as the master key.")])]),t._v(" "),e("div",{staticClass:"language- extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("aor(and(pk(A),time(T)),pk(B))\n")])])]),e("ol",{attrs:{start:"4"}},[e("li",[t._v("HTLC payment to B, which, if unspent for T blocks, returns to A.")])]),t._v(" "),e("div",{staticClass:"language- extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("aor(and(pk(A),time(T)),and(pk(B),hash(H))))\n")])])]),e("p",[t._v("The Miniscript Policy Compiler is written in Rust and is present in "),e("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-miniscript",target:"_blank",rel:"noopener noreferrer"}},[t._v("this repository"),e("OutboundLink")],1),t._v(".\nIn this blog, we will later use the same using "),e("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk",target:"_blank",rel:"noopener noreferrer"}},[t._v("bitcoindevkit/bdk"),e("OutboundLink")],1),t._v(", a lightweight descriptor-based wallet library\nwith a "),e("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk-cli",target:"_blank",rel:"noopener noreferrer"}},[t._v("cli"),e("OutboundLink")],1),t._v(".")]),t._v(" "),e("h2",{attrs:{id:"descriptors"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#descriptors"}},[t._v("#")]),t._v(" Descriptors")]),t._v(" "),e("p",[t._v('The Bitcoin scriptpubkey supports various schemes like P2PKH, P2SH, P2WPKH, P2TR (Segwit v1) etc.\nA Descriptor is a simple "description" of what scriptpubkey to be used for a given policy.\nIt can inclue a single pubkey within itself, or an entire miniscript policy.\nOn the other hand, Miniscript policies are used to derive the redeemscript (the actual executable script), whereas the descriptor describes how the redeemscript will be encumbered within the scriptpubkey.')]),t._v(" "),e("p",[t._v('In other words, a descriptor "describes" the procedure to create an '),e("em",[t._v("address")]),t._v(", given a "),e("em",[t._v("spending condition")]),t._v(".")]),t._v(" "),e("p",[t._v("They make it easier to deal with Multisig or complicated key setups.\nDescriptors are super portable and can be easily used by any wallet to determine the list of all addresses that can be generated from the same.\nThis feature creates a common stage for all Bitcoin apps and software.")]),t._v(" "),e("p",[t._v("The concept of descriptor came into existence in 2018 and since then, a lot of wallets have added support for descriptors.\nYou can read the descriptor doc from "),e("code",[t._v("bitcoin-core")]),t._v(" "),e("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),e("OutboundLink")],1),t._v(".")]),t._v(" "),e("p",[t._v('According to Bitcoin Core, Output Descriptors are "a simple language which can be used to describe collections of output scripts".\nThey bring in themselves, derivation paths, master xpub/xprv fingerprints and paths to generate addresses from.\nLet\'s understand this with an example of an Output Descriptor:')]),t._v(" "),e("div",{staticClass:"language- extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("\nDescriptor: pkh([d34db33f/44'/0'/0']xpub6ERaJH[...]LJRcEL/1/*)#ml40v0wf\n <1> <--------2---------\x3e<----------3---------\x3e<4> <---5---\x3e\n\nSections:\n1 - address type specifier (here, describing P2PK type addresses)\n2 - master key fingerprint and derivation path from master\n3 - xpub at m/44'/0'/0\n4 - path to deriving keys/addresses at\n5 - checksum for the descriptor\n")])])]),e("p",[t._v("A descriptor have three parts:")]),t._v(" "),e("ul",[e("li",[e("em",[t._v("address type specifier")]),t._v(" (item 1) : describes the type of address created by this descriptor.")]),t._v(" "),e("li",[e("em",[t._v("policy")]),t._v(" : the spending condition that locks funds into this address.")]),t._v(" "),e("li",[e("em",[t._v("checksum")]),t._v(" : for quick verification.")])]),t._v(" "),e("p",[t._v("The address type specifiers currently supported are "),e("code",[t._v("pk")]),t._v(", "),e("code",[t._v("pkh")]),t._v(", "),e("code",[t._v("sh")]),t._v(", "),e("code",[t._v("wpkh")]),t._v(", "),e("code",[t._v("wsh")]),t._v(" for corresponding address type and recently added "),e("code",[t._v("tr")]),t._v(" for taproot addresses.")]),t._v(" "),e("p",[t._v("There is a special address specifier called "),e("code",[t._v("combo")]),t._v(" that creates addresses of all types from spending policy policy.")]),t._v(" "),e("p",[t._v("After the address specifier, comes the "),e("em",[t._v("policy")]),t._v(' that describes how the funds in the address can be spent. The descriptor\nabove in the example has a simple spending policy of "spend by the correct private key". There can be more complicated policies,\nand we will touch them in later sections.')]),t._v(" "),e("p",[e("code",[t._v("multi")]),t._v(" is a special keyword that can be used as both "),e("em",[t._v("address type")]),t._v(" and "),e("em",[t._v("policy")]),t._v(".\nWhen used as an "),e("em",[t._v("address type")]),t._v(" like "),e("code",[t._v("multi(...)")]),t._v(", it will create an address from the raw multisig scriptpubkey.\nWhile when used as a "),e("em",[t._v("policy")]),t._v(" like "),e("code",[t._v("wsh(multi(...))")]),t._v(" it will create that specific address type from the multisig script.\nOf course we cannot use "),e("code",[t._v("pk(multi(...))")]),t._v(", "),e("code",[t._v("pkh(multi(...))")]),t._v(" or "),e("code",[t._v("wpkh(multi(...))")]),t._v(", because these address types cannot hold scripts (any scripts) inside them.")]),t._v(" "),e("p",[t._v("For example a descriptor like "),e("code",[t._v("wsh(multi(2, PKA, PKB, PKC))")]),t._v(" describes a P2WSH type address created by a "),e("code",[t._v("2-of-3")]),t._v(" multisig\nscript using "),e("code",[t._v("PKA")]),t._v(", "),e("code",[t._v("PKB")]),t._v(" and "),e("code",[t._v("PKC")]),t._v(" pubkeys.")]),t._v(" "),e("h2",{attrs:{id:"where-it-all-comes-together"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#where-it-all-comes-together"}},[t._v("#")]),t._v(" Where it all comes together...")]),t._v(" "),e("p",[t._v("In this section, we are going to make a descriptor-based wallet and derive addresses from "),e("code",[t._v("bitcoin-cli")]),t._v(" and then use "),e("code",[t._v("bdk-cli")]),t._v(" to confirm that the addresses generated for descriptor wallets are deterministic for a given descriptor.")]),t._v(" "),e("p",[t._v("We will also try to create a vault miniscript policy and push funds to the vault with a lock time of 2 months.\nDuring this time, we will try to break our vault and see our transactions failing.")]),t._v(" "),e("h4",{attrs:{id:"tools-and-armor"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#tools-and-armor"}},[t._v("#")]),t._v(" Tools and Armor")]),t._v(" "),e("ul",[e("li",[e("a",{attrs:{href:"https://docs.docker.com/engine/install/",target:"_blank",rel:"noopener noreferrer"}},[t._v("docker"),e("OutboundLink")],1)]),t._v(" "),e("li",[e("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk-cli",target:"_blank",rel:"noopener noreferrer"}},[t._v("bdk-cli"),e("OutboundLink")],1)]),t._v(" "),e("li",[e("a",{attrs:{href:"https://bitcoindevkit.org/bdk-cli/compiler/#installation",target:"_blank",rel:"noopener noreferrer"}},[t._v("miniscriptc"),e("OutboundLink")],1)])]),t._v(" "),e("h4",{attrs:{id:"setting-up"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#setting-up"}},[t._v("#")]),t._v(" Setting Up")]),t._v(" "),e("p",[t._v("We require "),e("code",[t._v("bitcoind")]),t._v(" to run in "),e("code",[t._v("regtest")]),t._v(" mode. Use the following config file, or any other config\nthat you are familiar with.")]),t._v(" "),e("div",{staticClass:"language-txt extra-class"},[e("pre",{pre:!0,attrs:{class:"language-txt"}},[e("code",[t._v("regtest=1\nfallbackfee=0.0001\nserver=1\n\nrpcuser=user\nrpcpassword=password\n")])])]),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Start Bitcoin Core")]),t._v("\nbitcoind\n")])])]),e("h3",{attrs:{id:"keys-and-generating-addresses"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#keys-and-generating-addresses"}},[t._v("#")]),t._v(" Keys and Generating Addresses")]),t._v(" "),e("p",[t._v("Quick installation for "),e("code",[t._v("bdk-cli")]),t._v(" and "),e("code",[t._v("miniscriptc")]),t._v(":")]),t._v(" "),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[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("rpc,compiler\n"),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 "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--features")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"compiler"')]),t._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--example")]),t._v(" miniscriptc\n")])])]),e("p",[t._v("Let us first generate an XPRV and create the wpkh wallet descriptor")]),t._v(" "),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[e("code",[e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("XPRV")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("bdk-cli key generate "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("'.xprv'")]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("EX_DESC")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"wpkh('),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$XPRV")]),t._v("/86'/1'/0'/0/*)\"")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("EX_DESC_CS")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("elcli getdescriptorinfo $EX_DESC "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("'.checksum'")]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("EX_DESC")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$EX_DESC")]),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("#$EX_DESC_CS")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Set this descriptor in a wallet in bitcoin-cli")]),t._v("\nbitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-named")]),t._v(" createwallet "),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("wallet_name")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"mywallet"')]),t._v(" "),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("descriptors")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("true\nbitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-rpcwallet")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"mywallet"')]),t._v(" importdescriptors "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"[{'),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v("desc"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v(":"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$EX_DESC")]),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v(", "),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v("timestamp"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v(":"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v("now"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v(", "),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v("active"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v(": true, "),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v("range"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v(': [0,100]}]"')]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("echo")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$EX_DESC")]),t._v("\n")])])]),e("p",[t._v("It should look something like this:")]),t._v(" "),e("div",{staticClass:"language- extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("wpkh(tprv8ZgxMBicQKsPeuazF16EdPZw84eHj55AU8ZKgZgdhu3sXcHnFgjzskfDvZdTaAFHYNCbKqrurFo9onSaT7zGT1i3u3j7LKhVZF5sJA39WPN/86'/1'/0'/0/*)#40hv8z77\n")])])]),e("p",[t._v("Now, we will generate 10 addresses using "),e("code",[t._v("bitcoin-cli")]),t._v(" and thereafter "),e("code",[t._v("bdk-cli")]),t._v(" using this above descriptor.\nNotice how both of them output the same set of addresses.")]),t._v(" "),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Generation via bdk-cli")]),t._v("\nrepeat "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("10")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v(" bdk-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-n")]),t._v(" regtest wallet "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--descriptor")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$EX_DESC")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-w")]),t._v(" mywallet get_new_address "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".address"')]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nbcrt1qc9wzxf8pthyexl00m23ug92pqrthagnzzf33wp\nbcrt1qgnh7e72q92fqujwg3qxlg5kplxkm6rep0nerur\nbcrt1qea6r8yvd0peupk29p94wm0xasvydgdsnyzkhez\nbcrt1qm99230tpqflq0f8kpkn5d2tee02hgqcsw5sd99\nbcrt1qd0afjfnl5udrsfkrj72rl34pss34yluma752qv\nbcrt1qj2aymplrzxcp4m7vcxrzq93g58pmgm4fpluesy\nbcrt1q4p4k63xglftez0h8yc7d4kmhsn5j5kecguu34j\nbcrt1q29z2uanskweur7qrzr43gyv3l028s0pnd9ptvp\nbcrt1qkzpeqz8sd73sucfythjxftez0e3ee30yhp9w67\nbcrt1qptwd6ggy8ttryck2f6yjf4la68apruc3fs7elz\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Generation via bitcoin-cli")]),t._v("\nrepeat "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("10")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v(" bitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-rpcwallet")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"mywallet"')]),t._v(" getnewaddress "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nbcrt1qc9wzxf8pthyexl00m23ug92pqrthagnzzf33wp\nbcrt1qgnh7e72q92fqujwg3qxlg5kplxkm6rep0nerur\nbcrt1qea6r8yvd0peupk29p94wm0xasvydgdsnyzkhez\nbcrt1qm99230tpqflq0f8kpkn5d2tee02hgqcsw5sd99\nbcrt1qd0afjfnl5udrsfkrj72rl34pss34yluma752qv\nbcrt1qj2aymplrzxcp4m7vcxrzq93g58pmgm4fpluesy\nbcrt1q4p4k63xglftez0h8yc7d4kmhsn5j5kecguu34j\nbcrt1q29z2uanskweur7qrzr43gyv3l028s0pnd9ptvp\nbcrt1qkzpeqz8sd73sucfythjxftez0e3ee30yhp9w67\nbcrt1qptwd6ggy8ttryck2f6yjf4la68apruc3fs7elz\n")])])]),e("p",[t._v("Notes:")]),t._v(" "),e("ul",[e("li",[t._v("The "),e("code",[t._v("repeat n {}")]),t._v(" syntax will only work in "),e("code",[t._v("zsh")]),t._v(", you can use other loops for your shell, or just manually repeat the code 10 times.")]),t._v(" "),e("li",[t._v("In case you get different outputs in either of the cases, try deleting "),e("code",[t._v("~/.bdk-bitcoin")]),t._v(" and retrying (thanks "),e("a",{attrs:{href:"https://twitter.com/notmandatory",target:"_blank",rel:"noopener noreferrer"}},[t._v("@Steve"),e("OutboundLink")],1),t._v(" for this tip!)")])]),t._v(" "),e("p",[t._v("Note that both "),e("code",[t._v("bdk-cli")]),t._v(" and "),e("code",[t._v("bitcoin-cli")]),t._v(" produced the exact same addresses. So now we have definitive proof that descriptors can make wallets portable. That single string will be able to make any wallet generate the same set of addresses and hence they can sync and broadcast transactions in the same manner!")]),t._v(" "),e("h3",{attrs:{id:"making-a-multisig-descriptor-for-funds"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#making-a-multisig-descriptor-for-funds"}},[t._v("#")]),t._v(" Making a MultiSig Descriptor for Funds")]),t._v(" "),e("p",[t._v("In the real-life, most of us hold two kinds of savings accounts - one to store huge funds saved throughout our lifetime "),e("em",[t._v("(probably without internet banking functionalities)")]),t._v("\nand another for regular expenses.")]),t._v(" "),e("p",[t._v("In the Bitcoin world, to store huge funds, most people prefer to use a Multisig descriptor with a "),e("code",[t._v("2-of-3")]),t._v(" or "),e("code",[t._v("3-of-4")]),t._v(" setup.\nThey can have one key stored in their PC, one key stored in a hardware wallet, one key stored in writing in a secure vault and another key learnt by heart.\nIn case of a mishap like a house burning on fire or permanent memory loss, they would still be able to recover their funds by using the other keys.")]),t._v(" "),e("p",[t._v("Here's how a secure "),e("code",[t._v("2-of-3")]),t._v(" descriptor generation would look like:")]),t._v(" "),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# xprv generation")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("K1_XPRV")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("bdk-cli key generate "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token 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"),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".xprv"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# xpub generation")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("K1_XPUB")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("bdk-cli key derive "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--xprv")]),t._v(" $K1_XPRV "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--path")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("\"m/84'/1'/0'/0\"")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".xpub"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("K2_XPUB")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("bdk-cli key derive "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--xprv")]),t._v(" $K2_XPRV "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--path")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("\"m/84'/1'/0'/0\"")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".xpub"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("K3_XPUB")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("bdk-cli key derive "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--xprv")]),t._v(" $K3_XPRV "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--path")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("\"m/84'/1'/0'/0\"")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".xpub"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Descriptors for each key - Since we used BIP-84 generation paths for xpubs,")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# we need to append the same to the xprvs so that our wallet can understand ")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# which path to generate addresses and xpubs from")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("K1_DESC")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"wsh(multi(2,'),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$K1_XPRV")]),t._v("/84'/1'/0'/0/*,"),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$K2_XPUB")]),t._v(","),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$K3_XPUB")]),t._v('))"')]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("K2_DESC")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"wsh(multi(2,'),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$K1_XPUB")]),t._v(","),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$K2_XPRV")]),t._v("/84'/1'/0'/0/*,"),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$K3_XPUB")]),t._v('))"')]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("K3_DESC")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"wsh(multi(2,'),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$K1_XPUB")]),t._v(","),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$K2_XPUB")]),t._v(","),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$K3_XPRV")]),t._v("/84'/1'/0'/0/*))\"")]),t._v("\n")])])]),e("p",[t._v("Lets create three bdk wallets aliases with above descriptors for easy future use\nand do initial sync to create the wallet files")]),t._v(" "),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[e("code",[e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("alias")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("k1wallet")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("'bdk-cli -n regtest wallet -w K1 -d $K1_DESC'")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("alias")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("k2wallet")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("'bdk-cli -n regtest wallet -w K2 -d $K2_DESC'")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("alias")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("k3wallet")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("'bdk-cli -n regtest wallet -w K3 -d $K3_DESC'")]),t._v("\n\nk1wallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nk2wallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nk3wallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("p",[t._v("Now, let us send some funds to an address generated by "),e("code",[t._v("k1wallet")]),t._v(".")]),t._v(" "),e("div",{staticClass:"language- extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v('# ask regtest to generate 101 blocks, so we get 50 regtest coins to play with.\n# because coinbase amounts are only spendable after 100 blocks, we generate\n# 101 blocks, to use the first block\'s coinbase amount.\nCORE_ADDR=$(bitcoin-cli getnewaddress)\nbitcoin-cli generatetoaddress 101 $CORE_ADDR\nbitcoin-cli getbalance\n50.00000000\n\n# And then send 10 btc to an address generated by `K1` descriptor\nBDK_ADDR=$(k1wallet get_new_address | jq -r ".address")\nbitcoin-cli -rpcwallet=mywallet sendtoaddress $BDK_ADDR 10\n\n# Confirm the transaction by creating one more block\nbitcoin-cli generatetoaddress 1 $CORE_ADDR\n')])])]),e("p",[t._v("Now sync the wallets and check balances in each")]),t._v(" "),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[e("code",[t._v("k1wallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nk1wallet get_balance\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"satoshi"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("1000000000")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\nk2wallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nk2wallet get_balance\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"satoshi"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("1000000000")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\nk3wallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nk3wallet get_balance\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"satoshi"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("1000000000")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("p",[t._v("Everyone has the same amount of balance.\nThis happened because it was a multisig wallet.\nNow, let's try to spend some balance.\nWe will give back some balance to the wallet maintained by "),e("code",[t._v("bitcoin-cli")]),t._v(".\nBut remember, this is a "),e("code",[t._v("2-of-3")]),t._v(" multisig wallet.\nThat's why we will need at least two keys to sign to make a transaction.")]),t._v(" "),e("p",[t._v("Here's where we will require to use a "),e("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0174.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[t._v("PSBT"),e("OutboundLink")],1),t._v(" or a "),e("em",[t._v("partially signed bitcoin transaction")]),t._v(".\nBitcoin uses PSBTs as the standard protocol to create a transaction and add one or more signatures to it before broadcasting the same to\nthe network which finally can become a proper valid "),e("em",[t._v("transaction")]),t._v(".")]),t._v(" "),e("p",[t._v("We will aks "),e("code",[t._v("k2wallet")]),t._v(" to create and sign the transaction then "),e("code",[t._v("k1wallet")]),t._v(" and "),e("code",[t._v("k3wallet")]),t._v(" will co-sign it.\nNote that "),e("code",[t._v("k2wallet")]),t._v(" even if it creates the transaction, doesn't need to sign it, because its a "),e("code",[t._v("2-of-3")]),t._v(" multisig!")]),t._v(" "),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# create the transaction, can be started by anyone")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("PSBT")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("k2wallet create_tx "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--to")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"'),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$CORE_ADDR")]),t._v(':100000000"')]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".psbt"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Sign the transaction by K1 and look at the output")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# it should say the psbt is not finalized since only one party has signed")]),t._v("\nk1wallet sign "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--psbt")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$PSBT")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"is_finalized"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" false,\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"psbt"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),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("# Saving the PSBT signed by K1")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("K1_SIGNED_PSBT")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("k1wallet sign "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--psbt")]),t._v(" $PSBT "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".psbt"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Sign by K3 - should be finalized this time")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Notice that this time, the input psbt was the signed PSBT of K1")]),t._v("\nk3wallet sign "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--psbt")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$K1_SIGNED_PSBT")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"is_finalized"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" true,\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"psbt"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),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("# Saving the PSBT signed by K3")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("SIGNED_PSBT")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("k3wallet sign "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--psbt")]),t._v(" $K1_SIGNED_PSBT "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".psbt"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Broadcast the transaction, again doesn't really matter who broadcasts")]),t._v("\nk2wallet broadcast "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--psbt")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$SIGNED_PSBT")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"txid"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"49e2706fc73c49605692bf1b9ce58baf1eb0307ea39b3118628994fd56c9b642"')]),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("# Confirm the transaction by generating one block")]),t._v("\nbitcoin-cli generatetoaddress "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("1")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$CORE_ADDR")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Sync and check balance - it should have gone down by 100000000 + tx fees")]),t._v("\nk1wallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\nk1wallet get_balance\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"satoshi"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("899999810")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Check similarly for `k2wallet` and `k3wallet` and they should all have same balance")]),t._v("\n")])])]),e("p",[t._v("So this proves we can definitely do transactions with multisig wallets with complicated descriptors.\nSince for Bitcoin, having keys equal having access to the accounts, we need to keep our keys safe.\nFor legacy single key wallets, we used to keep backups of the mnemonic codes in multiple places.\nIt was pretty insecure because in case any one of those backups leaks, our entire account would be compromised.\nComplicated multisig wallet descriptors are definitely a step forward - just in case a single key leak or are lost, no one would be able to take charge of the funds we hold.")]),t._v(" "),e("p",[t._v("Another problem with multisig was syncing between wallets to always create consistent addresses. How would\none wallet know whats the next address to create without talking to other wallets? The answer is "),e("code",[t._v("descriptors + PSBT")]),t._v(".\nIf all the wallet shares the correct descriptor string they will always create the exact sequence of addresses and\nby passing around PSBTs they would know how to sign them, without talking to each other. This solves a major problem of multisig interoperability. And BDK makes this process as seamless as possible.")]),t._v(" "),e("h2",{attrs:{id:"retention-bonus-smart-contract-with-bitcoin"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#retention-bonus-smart-contract-with-bitcoin"}},[t._v("#")]),t._v(" Retention Bonus - Smart Contract with Bitcoin")]),t._v(" "),e("p",[t._v("Let us consider that a company wants to give its employees a retention bonus for two months.\nIf an employee stays with that company for over 2 months, the employee would get 1 BTC as a reward.\nThis would be a smart contract between the company and an employee.\nThe employee should be able to see that he would get his funds after two months.\nThe company would require confidence that the employee would not be able to withdraw the reward before two months have passed.")]),t._v(" "),e("p",[t._v("The Miniscript policy for this contract would be as follows:")]),t._v(" "),e("div",{staticClass:"language- extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("or(99@and(pk(E),older(8640)),pk(C))\n")])])]),e("p",[t._v("where "),e("code",[t._v("E")]),t._v(" is the employee and "),e("code",[t._v("C")]),t._v(" is the company.")]),t._v(" "),e("p",[t._v("I should emphasize over here that this policy will let the company still transfer funds after the designated 2 months.\nIt's not possible to block them after the lock time has passed, atleast not in a single policy.")]),t._v(" "),e("p",[t._v("Surely, after two months, the funds can be unlocked by the employee but before that, the company can revoke the funds.\nLet us compile this policy down to a descriptor. And this time we will ask help from the "),e("code",[t._v("miniscript")]),t._v(" program.")]),t._v(" "),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# The Descriptor will be on the log, the E and C are placeholders")]),t._v("\nminiscriptc "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"or(99@and(pk(E),older(8640)),pk(C))"')]),t._v(" sh-wsh\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("2021")]),t._v("-08-05T12:25:40Z INFO miniscriptc"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" Compiling policy: or"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("99")]),t._v("@and"),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("E"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(",older"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("8640")]),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("C"),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 number"}},[t._v("2021")]),t._v("-08-05T12:25:40Z INFO miniscriptc"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("..")]),t._v(". Descriptor: sh"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("wsh"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("andor"),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("E"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(",older"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("8640")]),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("C"),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 comment"}},[t._v("#55wzucxa")]),t._v("\nError: Descriptor"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("Miniscript"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("Unexpected"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Key too short (<66 char), doesn\'t match any format"')]),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("So the compiled descriptor is")]),t._v(" "),e("div",{staticClass:"language- extra-class"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("sh(wsh(andor(pk(E),older(8640),pk(C))))\n")])])]),e("p",[t._v("Let's make the keys, generate addresses using the above descriptor and fund it.")]),t._v(" "),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# xprvs")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("E_XPRV")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("bdk-cli key generate "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".xprv"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("C_XPRV")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("bdk-cli key generate "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".xprv"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# xpubs")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("E_XPUB")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("bdk-cli key derive "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--xprv")]),t._v(" $E_XPRV "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--path")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("\"m/84'/1'/0'/0\"")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".xpub"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("C_XPUB")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("bdk-cli key derive "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--xprv")]),t._v(" $C_XPRV "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--path")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("\"m/84'/1'/0'/0\"")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".xpub"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# descriptors using the compiled miniscript")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# please note in case company or the employee was using a complicated multisig descriptor,")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# it may as well have been added here like we did in the example before")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("E_DESC")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"sh(wsh(andor(pk('),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$E_XPRV")]),t._v("/84'/1'/0'/0/*),older(8640),pk("),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$C_XPUB")]),t._v('))))"')]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("C_DESC")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"sh(wsh(andor(pk('),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$E_XPUB")]),t._v("),older(8640),pk("),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$C_XPRV")]),t._v("/84'/1'/0'/0/*))))\"")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Create wallet aliases for easy access and sync the wallet to create initial wallet files")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("alias")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("Cwallet")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("'bdk-cli -n regtest wallet -w C -d $C_DESC'")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v("alias")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("Ewallet")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v("'bdk-cli -n regtest wallet -w E -d $E_DESC'")]),t._v("\n\nCwallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nEwallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# get some funds in Cwallet's address")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("C_ADDR")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("Cwallet get_new_address "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".address"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\nbitcoin-cli "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-rpcwallet")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("mywallet sendtoaddress "),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$C_ADDR")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("10")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Confirm the transaction")]),t._v("\nbitcoin-cli generatetoaddress "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("1")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$CORE_ADDR")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Sync and check balance")]),t._v("\nCwallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nCwallet get_balance\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"satoshi"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("1000000000")]),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("# Just as before, the employe can also see the fund in their wallet")]),t._v("\nEwallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nEwallet get_balance\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"satoshi"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("1000000000")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("p",[t._v("According to the spending policy, for "),e("code",[t._v("E")]),t._v(" has to wait for 8640 blocks before he can spend the coins.\nBut let's check what happens if "),e("code",[t._v("E")]),t._v(" tries to transact before the designated 2 months anyway.")]),t._v(" "),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# address to send the transaction to")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("E_ADDR")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("Ewallet getnewaddress "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".address"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# get external_policy id - this identifies which policy the wallet will try to sign against")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("POLICY_ID")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("Ewallet policies "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".external | .id"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# create the tx (external_policy id from last step in my case is j7ncy3au")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("PSBT")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("Ewallet create_tx "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--to")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"'),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$E_ADDR")]),t._v(':100000000"')]),t._v(" "),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('\\"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$POLICY_ID")]),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v(':[0]}"')]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".psbt"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# sign and save the signed psbt")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("SIGNED_PSBT")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("Ewallet sign "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--psbt")]),t._v(" $PSBT "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".psbt"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# now let's try to broadcast - and see it failing")]),t._v("\nEwallet broadcast "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--psbt")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$SIGNED_PSBT")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("2021")]),t._v("-08-05T17:48:45Z ERROR bdk_cli"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" Electrum"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("Protocol"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("Object"),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 string"}},[t._v('"code"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" Number"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("2")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(", "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"message"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" String"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"sendrawtransaction RPC error: {'),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v("code"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v(":-26,"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v("message"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v(":"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v("non-BIP68-final"),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),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("))")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),e("p",[t._v("We get an error saying the transaction we sent is "),e("strong",[t._v("Not BIP68 Final")]),t._v(".\n"),e("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0068.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[t._v("BIP68"),e("OutboundLink")],1),t._v(" is a relative lock-time specification that ensures consensus when a signed transaction is sent which is invalid at a given time because the lock time isn't passed.\nSo that's an expected error.")]),t._v(" "),e("p",[t._v("Now let's simulate two months passing and retry.")]),t._v(" "),e("div",{staticClass:"language-bash extra-class"},[e("pre",{pre:!0,attrs:{class:"language-bash"}},[e("code",[e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# simulate two months")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# this will take around 1 mins to complete")]),t._v("\nbitcoin-cli generatetoaddress "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("8640")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$CORE_ADDR")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# create, sign and broadcast tx")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("PSBT")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("Ewallet create_tx "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--to")]),t._v(" $E_ADDR:100000000 "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--external_policy")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"{'),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$POLICY_ID")]),e("span",{pre:!0,attrs:{class:"token entity",title:'\\"'}},[t._v('\\"')]),t._v(':[0]}"')]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("-r")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('".psbt"')]),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v(")")])]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token assign-left variable"}},[t._v("SIGNED_PSBT")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),e("span",{pre:!0,attrs:{class:"token variable"}},[e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$(")]),t._v("Ewallet sign "),e("span",{pre:!0,attrs:{class:"token parameter variable"}},[t._v("--psbt")]),t._v(" $PSBT "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" jq "),e("span",{pre:!0,attrs:{class:"token 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number"}},[t._v("1")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$CORE_ADDR")]),t._v("\n\n"),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# Sync and check balances")]),t._v("\nCwallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nCwallet get_balance\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"satoshi"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("999999810")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\nEwallet "),e("span",{pre:!0,attrs:{class:"token function"}},[t._v("sync")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\nEwallet get_balance\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"satoshi"')]),e("span",{pre:!0,attrs:{class:"token builtin class-name"}},[t._v(":")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token number"}},[t._v("999999810")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("p",[t._v("So this time it worked, because we have simulated 2 months passing by generating 8640 blocks. And both the Company\nand Employe wallet gets updated.\nHence, we saw that we can generate some smart contracts using Bitcoin.")]),t._v(" "),e("h2",{attrs:{id:"inspirations"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#inspirations"}},[t._v("#")]),t._v(" Inspirations")]),t._v(" "),e("ol",[e("li",[e("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md",target:"_blank",rel:"noopener noreferrer"}},[t._v("Descriptors from Bitcoin Core"),e("OutboundLink")],1)]),t._v(" "),e("li",[e("a",{attrs:{href:"http://bitcoin.sipa.be/miniscript",target:"_blank",rel:"noopener noreferrer"}},[t._v("Miniscript"),e("OutboundLink")],1)]),t._v(" "),e("li",[e("a",{attrs:{href:"https://bitcoinops.org/en/topics/output-script-descriptors",target:"_blank",rel:"noopener noreferrer"}},[t._v("Output Script Descriptors"),e("OutboundLink")],1)]),t._v(" "),e("li",[e("a",{attrs:{href:"https://bitcoindevkit.org/descriptors",target:"_blank",rel:"noopener noreferrer"}},[t._v("Descriptors in Bitcoin Dev Kit"),e("OutboundLink")],1)]),t._v(" "),e("li",[e("a",{attrs:{href:"https://bitcoindevkit.org/blog/2020/11/descriptors-in-the-wild/#the-role-of-descriptors",target:"_blank",rel:"noopener noreferrer"}},[t._v("Role of Descriptors"),e("OutboundLink")],1)]),t._v(" "),e("li",[e("a",{attrs:{href:"https://gist.github.com/notmandatory/483c7edd098550c235da75d5babcf255",target:"_blank",rel:"noopener noreferrer"}},[t._v("Making a Taproot Descriptor Wallet using bitcoin-cli"),e("OutboundLink")],1)]),t._v(" "),e("li",[e("a",{attrs:{href:"https://www.youtube.com/watch?v=XM1lzN4Zfks",target:"_blank",rel:"noopener noreferrer"}},[t._v("Miniscripts SBC '19 - Video"),e("OutboundLink")],1)]),t._v(" "),e("li",[e("a",{attrs:{href:"https://www.youtube.com/watch?v=xC25NzIjzog",target:"_blank",rel:"noopener noreferrer"}},[t._v("Rethinking Wallet Architecture: Native Descriptor Wallets - Video"),e("OutboundLink")],1)])]),t._v(" "),e("p",[t._v("Special thanks to my mentor "),e("a",{attrs:{href:"https://twitter.com/notmandatory",target:"_blank",rel:"noopener noreferrer"}},[t._v("Steve Myers"),e("OutboundLink")],1),t._v(" for the constant motivation and support he gave me and for clearing so many doubts!\nImmense thanks to "),e("a",{attrs:{href:"https://github.com/rajarshimaitra",target:"_blank",rel:"noopener noreferrer"}},[t._v("Raj"),e("OutboundLink")],1),t._v(" for reviewing this blog and giving such detailed suggestions.\nMany of the lines added here are his.\nAlso, thanks to the folks at the "),e("code",[t._v("#miniscript")]),t._v(" IRC channel to help me out with the Retention Bonus policy.")]),t._v(" "),e("p",[t._v("This blog was written during "),e("a",{attrs:{href:"https://summerofbitcoin.org",target:"_blank",rel:"noopener noreferrer"}},[t._v("Summer of Bitcoin 2021"),e("OutboundLink")],1),t._v(" by "),e("a",{attrs:{href:"https://twitter.com/@sandipndev",target:"_blank",rel:"noopener noreferrer"}},[t._v("Sandipan Dey"),e("OutboundLink")],1),t._v(".")])])}),[],!1,null,null,null);e.default=n.exports}}]); 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Things like which outputs to create, what "),s("code",[t._v("nLockTime")]),t._v(" to use, which UTXOs to spend, and much more.")]),t._v(" "),s("p",[t._v("Once fully configured, this builder was then given to the "),s("code",[t._v("Wallet")]),t._v(" itself in a "),s("code",[t._v("Wallet::create_tx()")]),t._v(" or "),s("code",[t._v("Wallet::bump_fee()")]),t._v(" call: the "),s("code",[t._v("Wallet")]),t._v(" would try to follow the "),s("em",[t._v("instructions")]),t._v(" given by the builder, but in\ncase of conflicting or straight-up wrong options it would have to fail and force the user to start over.")]),t._v(" "),s("p",[t._v("The new API maintains the concept of a "),s("em",[t._v("builder")]),t._v(", but it changes the way it's created so that it always contains a reference to the main "),s("code",[t._v("Wallet")]),t._v(" instance. What this means is that most checks can now be performed right\nwhen something is added to the builder, not at the end, allowing the user to recover from errors instead of having to start over.")]),t._v(" "),s("p",[t._v("This also opens the door to even more improvements and additions, such as a way to "),s("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/pull/279",target:"_blank",rel:"noopener noreferrer"}},[t._v("spend foreign utxos"),s("OutboundLink")],1),t._v(" in a transaction, or even a way to "),s("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/issues/280",target:"_blank",rel:"noopener noreferrer"}},[t._v("bump the fees of multiple transactions at once"),s("OutboundLink")],1),t._v(" by batching them together, which\nsaves a bit of space and money.")]),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("let")]),t._v(" send_to 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The last release fully supporting "),e("code",[t._v("1.45")]),t._v(" is "),e("code",[t._v("v0.5.1")]),t._v(".")]),t._v(" "),e("h2",{attrs:{id:"contributors"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#contributors"}},[t._v("#")]),t._v(" Contributors")]),t._v(" "),e("p",[t._v("A huge thanks to everybody who contributed to this new release with suggestions, pull requests and bug reports.")]),t._v(" "),e("p",[t._v("Since the "),e("code",[t._v("v0.5.1")]),t._v(" release around a month ago, we've had "),e("code",[t._v("37")]),t._v(" new commits made by "),e("code",[t._v("7")]),t._v(" different contributors for a total of "),e("code",[t._v("1092")]),t._v(" additions and "),e("code",[t._v("548")]),t._v(" deletions. Here's the "),e("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/compare/v0.5.1...v0.6.0",target:"_blank",rel:"noopener noreferrer"}},[t._v("full diff"),e("OutboundLink")],1),t._v(".")]),t._v(" "),e("p",[t._v("A special thanks to the new contributor for this release:")]),t._v(" "),e("ul",[e("li",[e("a",{attrs:{href:"https://github.com/da-kami",target:"_blank",rel:"noopener noreferrer"}},[t._v("@da-kami"),e("OutboundLink")],1),t._v(" - Daniel Karzel")])])])}),[],!1,null,null,null);e.default=n.exports}}]); \ No newline at end of file diff --git a/assets/js/62.b483815a.js b/assets/js/62.3606e160.js similarity index 99% rename from assets/js/62.b483815a.js rename to assets/js/62.3606e160.js index 65e6807dbf..5999196af9 100644 --- a/assets/js/62.b483815a.js +++ b/assets/js/62.3606e160.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[62],{411:function(t,e,s){"use strict";s.r(e);var a=s(7),n=Object(a.a)({},(function(){var t=this,e=t._self._c;return e("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[e("p",[t._v("A new release of BDK is out: "),e("a",{attrs:{href:"https://crates.io/crates/bdk/0.7.0",target:"_blank",rel:"noopener noreferrer"}},[e("code",[t._v("v0.7.0")]),e("OutboundLink")],1),t._v(" improved APIs, a more robust signing process and various bugfixes and improvements.")]),t._v(" "),e("p",[t._v("You can find the full "),e("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/blob/aaa9943a5f614da522cdac44af80adf941879210/CHANGELOG.md#v070---v060",target:"_blank",rel:"noopener noreferrer"}},[t._v("v0.7.0 changelog"),e("OutboundLink")],1),t._v(" on GitHub.")]),t._v(" "),e("h2",{attrs:{id:"whats-new-in-v070"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#whats-new-in-v070"}},[t._v("#")]),t._v(" What's new in v0.7.0")]),t._v(" "),e("p",[t._v("Below are some highlights of the new release:")]),t._v(" "),e("h3",{attrs:{id:"new-signing-api"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#new-signing-api"}},[t._v("#")]),t._v(" New Signing API")]),t._v(" "),e("p",[t._v("The "),e("code",[t._v("Wallet::sign()")]),t._v(" method has been updated to take a "),e("em",[t._v("mutable reference")]),t._v(" to a PSBT rather than consuming it entirely. 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punctuation"}},[t._v(";")]),t._v("\n")])])]),e("h3",{attrs:{id:"support-timelocks-in-the-policy-module"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#support-timelocks-in-the-policy-module"}},[t._v("#")]),t._v(" Support Timelocks in the "),e("code",[t._v("policy")]),t._v(" Module")]),t._v(" "),e("p",[t._v('A less-known part of BDK is its "policy" module: its goal is to take a descriptor and encode the spending policy represented by that descriptor in a more "user-friendly" format. 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Those two together are used in essentially any operation a user may do on a "),t("code",[e._v("Wallet")]),e._v(", and are thus impacted by any relatively large change or new feature added to the code.")]),e._v(" "),t("p",[e._v("Want to "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/pull/515",target:"_blank",rel:"noopener noreferrer"}},[e._v("keep track of whether a UTXO is spent"),t("OutboundLink")],1),e._v("? You need to change the "),t("code",[e._v("Database")]),e._v(" that stores this information. Want to "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/pull/669",target:"_blank",rel:"noopener noreferrer"}},[e._v("know the timestamp of the latest block"),t("OutboundLink")],1),e._v("?\nYou need to change the "),t("code",[e._v("Blockchain")]),e._v(" trait to fetch that extra bit of information. And the list goes on and on.")]),e._v(" "),t("p",[e._v("Since making changes to these traits is always so painful for us and our downstream users, this ended up delaying or considerably slowing down the development of new features in BDK.")]),e._v(" "),t("p",[e._v("bdk_core tries to minimize the (ab)use of traits, and this will help immensely when trying to provide a stable API for our users.")]),e._v(" "),t("h3",{attrs:{id:"upstreaming-our-code"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#upstreaming-our-code"}},[e._v("#")]),e._v(" Upstreaming our code")]),e._v(" "),t("p",[e._v("BDK internally implements many features that could be useful to other projects as well. While working on this integration we will also try to upstream some of our code to the relevant crates, mainly "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-miniscript",target:"_blank",rel:"noopener noreferrer"}},[t("code",[e._v("rust-miniscript")]),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("This has essentially three benefits:")]),e._v(" "),t("ol",[t("li",[e._v("A new set of eyes will take a look at the code, potentially spotting issues or suggesting improvements")]),e._v(" "),t("li",[e._v("This will lower the amount of code that we have to maintain ourselves")]),e._v(" "),t("li",[e._v("Other people can benefit from our code, which was previously tightly integrated into BDK and hard to re-use")])]),e._v(" "),t("h3",{attrs:{id:"partially-syncing-a-wallet"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#partially-syncing-a-wallet"}},[e._v("#")]),e._v(" Partially Syncing a Wallet")]),e._v(" "),t("p",[e._v("This single point was the main reason the bdk_core project was kickstarted, and it means giving our users the ability to incrementally sync a wallet over time instead of working in single big batches.")]),e._v(" "),t("p",[e._v("This is explained very well in the "),t("RouterLink",{attrs:{to:"/blog/bdk-core-pt1/"}},[e._v("first bdk_core post")]),e._v(", so I won't go into details here. Think of this as a much more flexible way to sync a wallet, which in turn will allow us to simplify our current implementation\nof blockchain backends like compact block filters, and also offer a better API for our users.")],1),e._v(" "),t("h3",{attrs:{id:"no-std"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#no-std"}},[e._v("#")]),e._v(" "),t("code",[e._v("no_std")])]),e._v(" "),t("p",[e._v("bdk_core is built with "),t("code",[e._v("no_std")]),e._v(" in mind since the beginning, something we've been wanting to support in BDK "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/issues/205",target:"_blank",rel:"noopener noreferrer"}},[e._v("for a long time"),t("OutboundLink")],1),e._v('. Being more modular means the "core" module doesn\'t really need that many dependencies,\nand this really simplifies the '),t("code",[e._v("no_std")]),e._v(" work.")]),e._v(" "),t("p",[e._v("This will allow the main components of BDK to work on embedded hardware as well, making it possible to use the library as a foundation for any Bitcoin hardware device like hardware wallets.")]),e._v(" "),t("h3",{attrs:{id:"lower-msrv"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#lower-msrv"}},[e._v("#")]),e._v(" Lower MSRV")]),e._v(" "),t("p",[e._v("Removing many of our current dependencies from the core components of BDK will also allow us to lower our MSRV considerably, which in turn will allow BDK to compile on older distros or entirely different toolchains like\n"),t("a",{attrs:{href:"https://github.com/thepowersgang/mrustc",target:"_blank",rel:"noopener noreferrer"}},[t("code",[e._v("mrustc")]),t("OutboundLink")],1),e._v(", which usually don't keep up with "),t("code",[e._v("rustc")]),e._v(" in terms of language features.")]),e._v(" "),t("h2",{attrs:{id:"architecture"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#architecture"}},[e._v("#")]),e._v(" Architecture")]),e._v(" "),t("p",[e._v("Roughly speaking, after integrating bdk_core into BDK the architecture will look like this:")]),e._v(" "),t("ul",[t("li",[e._v("bdk_core: this crate will contain all the low level components of a Bitcoin wallet. For example, using this low level API it will be possible to keep track of arbitrary scripts (without the limitations"),t("sup",{staticClass:"footnote-ref"},[t("a",{attrs:{href:"#fn1",id:"fnref1"}},[e._v("[1]")])]),e._v("\nof descriptors) or apply individual blocks to the state of the wallet")]),e._v(" "),t("li",[e._v("bdk_compat: this crate will use the components provided by bdk_core to implement a descriptor-based wallet that supports up to two "),t("em",[e._v("keychains")]),e._v(", like our current "),t("code",[e._v("Wallet")]),e._v(" implementation does. It will allow our\nusers to upgrade to BDK 1.0 with minimal changes to their code, but being a compatibility layer it will probably lack many of the advanced features that bdk_core brings to the table")]),e._v(" "),t("li",[e._v("bdk_"),t("em",[e._v("")]),e._v(": the blockchain backends like Esplora, Electrum, RPC, will be moved into individual separate crates that users can decide to include individually")])]),e._v(" "),t("h2",{attrs:{id:"timeline"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#timeline"}},[e._v("#")]),e._v(" Timeline")]),e._v(" "),t("p",[e._v("We can't provide a precise timeline because it's a big development effort and it also depends on some relatively large PRs making into upstream project. That said, here's our rough plan:")]),e._v(" "),t("ol",[t("li",[e._v("October: during this month we will work on opening a PR to integrate bdk_core into BDK")]),e._v(" "),t("li",[e._v("November: review of the PR, work on upstreaming our code to "),t("code",[e._v("rust-miniscript")])]),e._v(" "),t("li",[e._v("December: finishing touches, examples, documentation")])]),e._v(" "),t("h2",{attrs:{id:"feature-freezing-bdk"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#feature-freezing-bdk"}},[e._v("#")]),e._v(" Feature Freezing BDK")]),e._v(" "),t("p",[e._v("With our focus shifting to bdk_core we are officially "),t("em",[e._v("feature freezing")]),e._v(" BDK starting from release "),t("code",[e._v("0.23")]),e._v(" (which will be published on October 6th). This means that we won't be adding any new features to BDK until the\nintegration is completed, because it takes a lot of effort to implement and/or review them, and there's the risk that most of the code will have to be re-done or thrown away anyway when moving to bdk_core.")]),e._v(" "),t("p",[e._v("A notable exception to this rule will be the upcoming "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/pull/770",target:"_blank",rel:"noopener noreferrer"}},[e._v("upgrade to "),t("code",[e._v("rust-bitcoin")]),e._v(" "),t("code",[e._v("0.29")]),t("OutboundLink")],1),e._v(", which is now planned for the release "),t("code",[e._v("0.24")]),e._v(" since "),t("code",[e._v("rust-miniscript")]),e._v(" "),t("code",[e._v("8.0.0")]),e._v(" hasn't been released in time for "),t("code",[e._v("0.23")]),e._v(".")]),e._v(" "),t("p",[e._v("During this feature freeze period we will keep maintaining the library, updating our dependencies, fixing bugs and making releases accordingly.")]),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("This is an exciting new development for BDK, a well needed refresh to an architecture that hasn't changed much over time, but that it's starting to show its age. This integration will open up so many new possibilities\nfor our downstream users, and it's a major step towards our goal of providing simple, yet powerful tools for Bitcoin developers 🚀.")]),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("Not every script can be expressed as descriptor "),t("a",{staticClass:"footnote-backref",attrs:{href:"#fnref1"}},[e._v("↩︎")])])])])])])}),[],!1,null,null,null);t.default=i.exports}}]); \ No newline at end of file +(window.webpackJsonp=window.webpackJsonp||[]).push([[65],{416:function(e,t,o){"use strict";o.r(t);var a=o(7),i=Object(a.a)({},(function(){var e=this,t=e._self._c;return t("ContentSlotsDistributor",{attrs:{"slot-key":e.$parent.slotKey}},[t("p",[e._v("Over the past few months the work on "),t("a",{attrs:{href:"https://github.com/LLFourn/bdk_core_staging",target:"_blank",rel:"noopener noreferrer"}},[e._v("bdk_core"),t("OutboundLink")],1),e._v(" quietly continued behind the scenes, and as the time went on it started expanding beyond the scope of just improving the "),t("em",[e._v("syncing")]),e._v(" mechanism of BDK. Being a new fresh\nproject it allowed for iterating much faster, and we soon realized we could make large improvements to the general architecture of BDK to fix many of the issues and shortcomings found over time.")]),e._v(" "),t("p",[e._v("For this reason, we decided to move forward with the project and start planning the integration into BDK itself. This blog post will briefly describe the new concept for how BDK will be structured and lay down a plan\nfor the development in the next few months.")]),e._v(" "),t("h2",{attrs:{id:"goals"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#goals"}},[e._v("#")]),e._v(" Goals")]),e._v(" "),t("p",[e._v("First of all, we should outline at least the main goals of BDK 1.0, ergo what we want to improve over the current state of the project.")]),e._v(" "),t("h3",{attrs:{id:"stable-api"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#stable-api"}},[e._v("#")]),e._v(" Stable API")]),e._v(" "),t("p",[e._v("Ever since the "),t("code",[e._v("0.1.0")]),e._v(" release of BDK we've always broken the API with each release. Most of the time in minor and very contained ways, but in "),t("em",[e._v("some")]),e._v(" way nonetheless. One of the main sources of breakage have been\nthe "),t("code",[e._v("Blockchain")]),e._v(" and "),t("code",[e._v("Database")]),e._v(" traits. Those two together are used in essentially any operation a user may do on a "),t("code",[e._v("Wallet")]),e._v(", and are thus impacted by any relatively large change or new feature added to the code.")]),e._v(" "),t("p",[e._v("Want to "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/pull/515",target:"_blank",rel:"noopener noreferrer"}},[e._v("keep track of whether a UTXO is spent"),t("OutboundLink")],1),e._v("? You need to change the "),t("code",[e._v("Database")]),e._v(" that stores this information. Want to "),t("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk/pull/669",target:"_blank",rel:"noopener noreferrer"}},[e._v("know the timestamp of the latest block"),t("OutboundLink")],1),e._v("?\nYou need to change the "),t("code",[e._v("Blockchain")]),e._v(" trait to fetch that extra bit of information. 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While working on this integration we will also try to upstream some of our code to the relevant crates, mainly "),t("a",{attrs:{href:"https://github.com/rust-bitcoin/rust-miniscript",target:"_blank",rel:"noopener noreferrer"}},[t("code",[e._v("rust-miniscript")]),t("OutboundLink")],1),e._v(".")]),e._v(" "),t("p",[e._v("This has essentially three benefits:")]),e._v(" "),t("ol",[t("li",[e._v("A new set of eyes will take a look at the code, potentially spotting issues or suggesting improvements")]),e._v(" "),t("li",[e._v("This will lower the amount of code that we have to maintain ourselves")]),e._v(" "),t("li",[e._v("Other people can benefit from our code, which was previously tightly integrated into BDK and hard to re-use")])]),e._v(" "),t("h3",{attrs:{id:"partially-syncing-a-wallet"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#partially-syncing-a-wallet"}},[e._v("#")]),e._v(" Partially Syncing a Wallet")]),e._v(" "),t("p",[e._v("This single point was the main reason the bdk_core project was kickstarted, and it means giving our users the ability to incrementally sync a wallet over time instead of working in single big batches.")]),e._v(" "),t("p",[e._v("This is explained very well in the "),t("RouterLink",{attrs:{to:"/blog/bdk-core-pt1/"}},[e._v("first bdk_core post")]),e._v(", so I won't go into details here. 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Being more modular means the "core" module doesn\'t really need that many dependencies,\nand this really simplifies the '),t("code",[e._v("no_std")]),e._v(" work.")]),e._v(" "),t("p",[e._v("This will allow the main components of BDK to work on embedded hardware as well, making it possible to use the library as a foundation for any Bitcoin hardware device like hardware wallets.")]),e._v(" "),t("h3",{attrs:{id:"lower-msrv"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#lower-msrv"}},[e._v("#")]),e._v(" Lower MSRV")]),e._v(" "),t("p",[e._v("Removing many of our current dependencies from the core components of BDK will also allow us to lower our MSRV considerably, which in turn will allow BDK to compile on older distros or entirely different toolchains like\n"),t("a",{attrs:{href:"https://github.com/thepowersgang/mrustc",target:"_blank",rel:"noopener noreferrer"}},[t("code",[e._v("mrustc")]),t("OutboundLink")],1),e._v(", which usually don't keep up with "),t("code",[e._v("rustc")]),e._v(" in terms of language features.")]),e._v(" "),t("h2",{attrs:{id:"architecture"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#architecture"}},[e._v("#")]),e._v(" Architecture")]),e._v(" "),t("p",[e._v("Roughly speaking, after integrating bdk_core into BDK the architecture will look like this:")]),e._v(" "),t("ul",[t("li",[e._v("bdk_core: this crate will contain all the low level components of a Bitcoin wallet. For example, using this low level API it will be possible to keep track of arbitrary scripts (without the limitations"),t("sup",{staticClass:"footnote-ref"},[t("a",{attrs:{href:"#fn1",id:"fnref1"}},[e._v("[1]")])]),e._v("\nof descriptors) or apply individual blocks to the state of the wallet")]),e._v(" "),t("li",[e._v("bdk_compat: this crate will use the components provided by bdk_core to implement a descriptor-based wallet that supports up to two "),t("em",[e._v("keychains")]),e._v(", like our current "),t("code",[e._v("Wallet")]),e._v(" implementation does. It will allow our\nusers to upgrade to BDK 1.0 with minimal changes to their code, but being a compatibility layer it will probably lack many of the advanced features that bdk_core brings to the table")]),e._v(" "),t("li",[e._v("bdk_"),t("em",[e._v("")]),e._v(": the blockchain backends like Esplora, Electrum, RPC, will be moved into individual separate crates that users can decide to include individually")])]),e._v(" "),t("h2",{attrs:{id:"timeline"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#timeline"}},[e._v("#")]),e._v(" Timeline")]),e._v(" "),t("p",[e._v("We can't provide a precise timeline because it's a big development effort and it also depends on some relatively large PRs making into upstream project. That said, here's our rough plan:")]),e._v(" "),t("ol",[t("li",[e._v("October: during this month we will work on opening a PR to integrate bdk_core into BDK")]),e._v(" "),t("li",[e._v("November: review of the PR, work on upstreaming our code to "),t("code",[e._v("rust-miniscript")])]),e._v(" "),t("li",[e._v("December: finishing touches, examples, documentation")])]),e._v(" "),t("h2",{attrs:{id:"feature-freezing-bdk"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#feature-freezing-bdk"}},[e._v("#")]),e._v(" Feature Freezing BDK")]),e._v(" "),t("p",[e._v("With our focus shifting to bdk_core we are officially "),t("em",[e._v("feature freezing")]),e._v(" BDK starting from release "),t("code",[e._v("0.23")]),e._v(" (which will be published on October 6th). 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This integration will open up so many new possibilities\nfor our downstream users, and it's a major step towards our goal of providing simple, yet powerful tools for Bitcoin developers 🚀.")]),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("Not every script can be expressed as descriptor "),t("a",{staticClass:"footnote-backref",attrs:{href:"#fnref1"}},[e._v("↩︎")])])])])])])}),[],!1,null,null,null);t.default=i.exports}}]); \ No newline at end of file diff --git a/assets/js/66.584abb88.js b/assets/js/66.371047c4.js similarity index 99% rename from assets/js/66.584abb88.js rename to assets/js/66.371047c4.js index 5d9ba5efd2..c8b2ea1194 100644 --- a/assets/js/66.584abb88.js +++ b/assets/js/66.371047c4.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[66],{416:function(a,s,t){"use strict";t.r(s);var e=t(7),n=Object(e.a)({},(function(){var a=this,s=a._self._c;return s("ContentSlotsDistributor",{attrs:{"slot-key":a.$parent.slotKey}},[s("h2",{attrs:{id:"introduction"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#introduction"}},[a._v("#")]),a._v(" Introduction")]),a._v(" "),s("p",[a._v("In this post we will use the "),s("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk-cli",target:"_blank",rel:"noopener noreferrer"}},[a._v("bdk-cli"),s("OutboundLink")],1),a._v(" tool to demonstrate how to use the "),s("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk",target:"_blank",rel:"noopener noreferrer"}},[a._v("bdk"),s("OutboundLink")],1),a._v(" library to:")]),a._v(" "),s("ol",[s("li",[a._v("generate "),s("em",[a._v("testnet")]),a._v(" public and private keys")]),a._v(" "),s("li",[a._v("create "),s("a",{attrs:{href:"https://bitcoinops.org/en/topics/psbt/",target:"_blank",rel:"noopener noreferrer"}},[a._v("PSBT"),s("OutboundLink")],1),a._v("s that can be spent based on different "),s("a",{attrs:{href:"http://bitcoin.sipa.be/miniscript/",target:"_blank",rel:"noopener noreferrer"}},[a._v("miniscript spending policies"),s("OutboundLink")],1)]),a._v(" "),s("li",[a._v("cooperatively sign and finalize the resulting PSBTs")]),a._v(" "),s("li",[a._v("broadcast and confirm spending transactions")])]),a._v(" "),s("p",[a._v("The scenario we will simulate is a wallet with two spending policies:")]),a._v(" "),s("p",[a._v("A. "),s("strong",[a._v("three")]),a._v(" out of "),s("strong",[a._v("three")]),a._v(" signers must sign spending transaction input "),s("a",{attrs:{href:"https://developer.bitcoin.org/glossary.html",target:"_blank",rel:"noopener noreferrer"}},[a._v("UTXO"),s("OutboundLink")],1),a._v("s, "),s("strong",[a._v("OR")])]),a._v(" "),s("p",[a._v("B. "),s("strong",[a._v("two")]),a._v(" out of "),s("strong",[a._v("three")]),a._v(" signers must sign "),s("strong",[a._v("AND")]),a._v(" the input UTXOs must be a relative number of blocks older than the spending transaction's block")]),a._v(" "),s("p",[a._v("In a real-world wallet a longer relative time-lock would probably be used, but we chose a two block time-lock to make testing easier.")]),a._v(" "),s("p",[s("em",[a._v("Note: If you repeat these instructions on your own your extended keys, addresses, and other values will be different than shown in this post, but the end results should be the same.")])]),a._v(" "),s("h2",{attrs:{id:"initial-setup"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#initial-setup"}},[a._v("#")]),a._v(" Initial Setup")]),a._v(" "),s("h3",{attrs:{id:"step-0-install-a-recent-version-bdk-cli"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-0-install-a-recent-version-bdk-cli"}},[a._v("#")]),a._v(" Step 0: Install a recent version "),s("code",[a._v("bdk-cli")])]),a._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"}},[a._v("cargo")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[a._v("install")]),a._v(" bdk-cli "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--features")]),a._v(" electrum\n\n"),s("span",{pre:!0,attrs:{class:"token comment"}},[a._v("# confirm bdk-cli is installed")]),a._v("\nbdk-cli "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--version")]),a._v("\nBDK CLI "),s("span",{pre:!0,attrs:{class:"token number"}},[a._v("0.4")]),a._v(".0\n\n"),s("span",{pre:!0,attrs:{class:"token comment"}},[a._v("# bdk-cli usage can be explored with the `help` sub-command")]),a._v("\nbdk-cli "),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("help")]),a._v("\n")])])]),s("h3",{attrs:{id:"step-1-generate-private-extended-keys"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-1-generate-private-extended-keys"}},[a._v("#")]),a._v(" Step 1: Generate private extended keys")]),a._v(" "),s("p",[a._v("Generate new extended private keys for each of our wallet participants:")]),a._v(" "),s("div",{staticClass:"language-bash extra-class"},[s("pre",{pre:!0,attrs:{class:"language-bash"}},[s("code",[a._v("bdk-cli key generate "),s("span",{pre:!0,attrs:{class:"token operator"}},[a._v("|")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[a._v("tee")]),a._v(" alice-key.json\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),a._v("\n "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"fingerprint"')]),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"5adb4683"')]),a._v(",\n 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derive")]),a._v(" sub-command will generate a tpub for the last hardened node in the given derivation path. You'll also notice that "),s("code",[a._v("bdk-cli")]),a._v(" will returns our tpub with the key origin (fingerprint/path) added to it (the metadata part that looks like "),s("code",[a._v("[5adb4683/84'/1'/0']")]),a._v(" right before the tpub). This key origin information is not necessary in order to use a tpub and generate addresses, but it's good practice to include it because some signers require it.")]),a._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 builtin class-name"}},[a._v("export")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token assign-left variable"}},[a._v("ALICE_XPUB")]),s("span",{pre:!0,attrs:{class:"token operator"}},[a._v("=")]),s("span",{pre:!0,attrs:{class:"token variable"}},[s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$(")]),a._v("bdk-cli key derive "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--xprv")]),a._v(" $ALICE_XPRV "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--path")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v("\"m/84'/1'/0'/0\"")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[a._v("|")]),a._v(" 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"),s("span",{pre:!0,attrs:{class:"token operator"}},[a._v("|")]),a._v(" jq "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-r")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('".xpub"')]),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v(")")])]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("echo")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("\\")]),a._v('"'),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$CAROL_XPUB")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("\\")]),a._v('"\n'),s("span",{pre:!0,attrs:{class:"token string"}},[a._v("\"[de41e56d/84'/1'/0']tpubDCdxmvzJ5QBjTN8oCjjyT2V58AyZvA1fkmCeZRC75QMoaHcVP2m45Bv3hmnR7ttAwkb2UNYyoXdHVt4gwBqRrJqLUU2JrM43HippxiWpHra/0/*\"")]),a._v("\n")])])]),s("h3",{attrs:{id:"step-4-create-wallet-descriptors-for-each-participant"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-4-create-wallet-descriptors-for-each-participant"}},[a._v("#")]),a._v(" Step 4: Create wallet descriptors for each participant")]),a._v(" "),s("p",[a._v("We used the "),s("a",{attrs:{href:"https://bitcoindevkit.org/bdk-cli/playground/",target:"_blank",rel:"noopener noreferrer"}},[a._v("BDK Playground Policy Compiler"),s("OutboundLink")],1),a._v(" to compile the "),s("a",{attrs:{href:"http://bitcoin.sipa.be/miniscript/",target:"_blank",rel:"noopener noreferrer"}},[a._v("miniscript"),s("OutboundLink")],1),a._v(" policy:")]),a._v(" "),s("p",[s("code",[a._v("thresh(3,pk(Alice),pk(Bob),pk(Carol),older(2))")])]),a._v(" "),s("p",[a._v("To the "),s("a",{attrs:{href:"https://bitcoindevkit.org/descriptors/",target:"_blank",rel:"noopener noreferrer"}},[a._v("output descriptor"),s("OutboundLink")],1),a._v(":")]),a._v(" "),s("p",[s("code",[a._v("wsh(thresh(3,pk(Alice),s:pk(Bob),s:pk(Carol),sdv:older(2)))")])]),a._v(" "),s("p",[a._v("This descriptor requires spending transaction inputs must be signed by all three signers, or by two signers and the spent UTXOs must be older than two blocks.")]),a._v(" "),s("p",[a._v("Each participant's descriptor only uses their own XPRV key plus the XPUB keys of the other participants.")]),a._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 builtin class-name"}},[a._v("export")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token assign-left variable"}},[a._v("ALICE_DESCRIPTOR")]),s("span",{pre:!0,attrs:{class:"token operator"}},[a._v("=")]),s("span",{pre:!0,attrs:{class:"token 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class-name"}},[a._v("export")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token assign-left variable"}},[a._v("CAROL_DESCRIPTOR")]),s("span",{pre:!0,attrs:{class:"token operator"}},[a._v("=")]),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"wsh(thresh(3,pk('),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$ALICE_XPUB")]),a._v("),s:pk("),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BOB_XPUB")]),a._v("),s:pk("),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$CAROL_XPRV")]),a._v("/84'/1'/0'/0/*),snl:older(2)))\"")]),a._v("\n")])])]),s("h2",{attrs:{id:"policy-a-three-signatures"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#policy-a-three-signatures"}},[a._v("#")]),a._v(" Policy A. Three signatures")]),a._v(" "),s("h3",{attrs:{id:"step-1a-create-a-testnet-segwit0-receive-address"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-1a-create-a-testnet-segwit0-receive-address"}},[a._v("#")]),a._v(" Step 1a: Create a testnet "),s("a",{attrs:{href:"https://en.bitcoin.it/wiki/Segregated_Witness",target:"_blank",rel:"noopener noreferrer"}},[a._v("segwit0"),s("OutboundLink")],1),a._v(" receive address")]),a._v(" "),s("p",[a._v("This step can be done independently by Alice, Bob, or Carol.")]),a._v(" "),s("div",{staticClass:"language-bash extra-class"},[s("pre",{pre:!0,attrs:{class:"language-bash"}},[s("code",[a._v("bdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" carol "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$CAROL_DESCRIPTOR")]),a._v(" get_new_address\n"),s("span",{pre:!0,attrs:{class:"token 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"),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" alice "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$ALICE_DESCRIPTOR")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[a._v("sync")]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\nbdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" alice "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$ALICE_DESCRIPTOR")]),a._v(" get_balance\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),a._v("\n "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"satoshi"')]),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[a._v("0")]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n")])])]),s("h4",{attrs:{id:"done-"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#done-"}},[a._v("#")]),a._v(" DONE!")]),a._v(" "),s("h2",{attrs:{id:"policy-b-two-signatures-after-a-relative-time-lock"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#policy-b-two-signatures-after-a-relative-time-lock"}},[a._v("#")]),a._v(" Policy B. Two signatures after a relative time lock")]),a._v(" "),s("p",[a._v("Now we will use the same extended private and public keys, and the same descriptors to receive and spend testnet bitcoin using only two of our participants signatures after the transaction input's relative time-lock has expired.")]),a._v(" "),s("h3",{attrs:{id:"step-1b-create-a-new-testnet-receive-address"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-1b-create-a-new-testnet-receive-address"}},[a._v("#")]),a._v(" Step 1b: Create a new testnet receive address")]),a._v(" "),s("p",[a._v("The receive address can still be generated by Alice, Bob, or Carol.")]),a._v(" "),s("div",{staticClass:"language-bash extra-class"},[s("pre",{pre:!0,attrs:{class:"language-bash"}},[s("code",[a._v("bdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" alice "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token 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"),s("p",[s("a",{attrs:{href:"https://mempool.space/testnet/address/tb1q886w2zmtakwxpngs9kn7y0a7tvd6e24u58sse2sv92zrjpnenfhqtfnmw9",target:"_blank",rel:"noopener noreferrer"}},[a._v("https://mempool.space/testnet/address/tb1q886w2zmtakwxpngs9kn7y0a7tvd6e24u58sse2sv92zrjpnenfhqtfnmw9"),s("OutboundLink")],1)]),a._v(" "),s("h3",{attrs:{id:"step-3b-sync-wallet-and-confirm-wallet-balance"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-3b-sync-wallet-and-confirm-wallet-balance"}},[a._v("#")]),a._v(" Step 3b: Sync wallet and confirm wallet balance")]),a._v(" "),s("p",[a._v("This step must be done by Alice and Bob so their individual descriptor wallets know about the faucet transaction they will later be spending the output of.")]),a._v(" "),s("div",{staticClass:"language-bash extra-class"},[s("pre",{pre:!0,attrs:{class:"language-bash"}},[s("code",[a._v("bdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" alice "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$ALICE_DESCRIPTOR")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[a._v("sync")]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\nbdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" alice "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$ALICE_DESCRIPTOR")]),a._v(" get_balance\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),a._v("\n "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"satoshi"')]),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[a._v("10000")]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n\nbdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" bob "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BOB_DESCRIPTOR")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[a._v("sync")]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\nbdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" bob "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BOB_DESCRIPTOR")]),a._v(" get_balance\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),a._v("\n "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"satoshi"')]),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[a._v("10000")]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n\n"),s("span",{pre:!0,attrs:{class:"token comment"}},[a._v("# NO CAROL SHE LOST HER KEY!")]),a._v("\n")])])]),s("h3",{attrs:{id:"step-4b-create-spending-transaction"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-4b-create-spending-transaction"}},[a._v("#")]),a._v(" Step 4b: Create spending transaction")]),a._v(" "),s("p",[a._v("This spending transaction uses Alice and Bob's keys plus a two block relative time-lock, see above "),s("a",{attrs:{href:"#step-4a-view-wallet-spending-policies"}},[a._v("Step 4a")]),a._v(" for the policy id. The transaction can be created by Alice or Bob.")]),a._v(" "),s("p",[a._v("A time based relative time-lock can be used instead of one based on blocks but is slightly more complicated to calculate. See\n"),s("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0068.mediawiki#specification",target:"_blank",rel:"noopener noreferrer"}},[a._v("BIP-68"),s("OutboundLink")],1),a._v(" for the details.")]),a._v(" "),s("div",{staticClass:"language-bash extra-class"},[s("pre",{pre:!0,attrs:{class:"language-bash"}},[s("code",[a._v("bdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" alice "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$ALICE_DESCRIPTOR")]),a._v(" create_tx "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-a")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--to")]),a._v(" tb1qm5tfegjevj27yvvna9elym9lnzcf0zraxgl8z2:0 "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--external_policy")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token 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SIGNS")]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("export")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token assign-left variable"}},[a._v("FINAL_PSBT2")]),s("span",{pre:!0,attrs:{class:"token operator"}},[a._v("=")]),s("span",{pre:!0,attrs:{class:"token variable"}},[s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$(")]),a._v("bdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" bob "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" $BOB_DESCRIPTOR sign "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--psbt")]),a._v(" $ALICE_SIGNED_PSBT2 "),s("span",{pre:!0,attrs:{class:"token operator"}},[a._v("|")]),a._v(" jq "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-r")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('".psbt"')]),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v(")")])]),a._v("\n\n"),s("span",{pre:!0,attrs:{class:"token comment"}},[a._v("# CAROL DOES *NOT* SIGN")]),a._v("\n")])])]),s("h3",{attrs:{id:"step-6b-broadcast-finalized-psbt"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-6b-broadcast-finalized-psbt"}},[a._v("#")]),a._v(" Step 6b: Broadcast finalized PSBT")]),a._v(" "),s("div",{staticClass:"language-bash extra-class"},[s("pre",{pre:!0,attrs:{class:"language-bash"}},[s("code",[a._v("bdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" bob "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BOB_DESCRIPTOR")]),a._v(" broadcast "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--psbt")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$FINAL_PSBT2")]),a._v("\nthread "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v("'main'")]),a._v(" panicked at "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('\'called `Result::unwrap()` on an `Err` value: Electrum(Protocol(String("sendrawtransaction RPC error: {\\"code\\":-26,\\"message\\":\\"non-BIP68-final\\"}")))\'')]),a._v(", src/bdk_cli.rs:168:50\n\n"),s("span",{pre:!0,attrs:{class:"token comment"}},[a._v("# Oops we didn't wait long enough for the relative time lock to expire")]),a._v("\n\n"),s("span",{pre:!0,attrs:{class:"token comment"}},[a._v("# Try again in ~20 mins and it is successfully broadcast")]),a._v("\n\nbdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" bob "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BOB_DESCRIPTOR")]),a._v(" broadcast "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--psbt")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$FINAL_PSBT2")]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),a._v("\n "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"txid"')]),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"6a04c60dff8eeb14dc0848c663d669c34ddc30125d9564364c9414e3ff4a7d28"')]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n")])])]),s("h3",{attrs:{id:"step-7b-view-confirmed-transaction"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-7b-view-confirmed-transaction"}},[a._v("#")]),a._v(" Step 7b: View confirmed transaction")]),a._v(" "),s("p",[s("a",{attrs:{href:"https://mempool.space/testnet/tx/6a04c60dff8eeb14dc0848c663d669c34ddc30125d9564364c9414e3ff4a7d28",target:"_blank",rel:"noopener noreferrer"}},[a._v("https://mempool.space/testnet/tx/6a04c60dff8eeb14dc0848c663d669c34ddc30125d9564364c9414e3ff4a7d28"),s("OutboundLink")],1)]),a._v(" "),s("p",[a._v("And wallet balance is again zero")]),a._v(" "),s("div",{staticClass:"language-bash extra-class"},[s("pre",{pre:!0,attrs:{class:"language-bash"}},[s("code",[a._v("bdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" alice "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$ALICE_DESCRIPTOR")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[a._v("sync")]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\nbdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" alice "),s("span",{pre:!0,attrs:{class:"token parameter 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+(window.webpackJsonp=window.webpackJsonp||[]).push([[66],{415:function(a,s,t){"use strict";t.r(s);var e=t(7),n=Object(e.a)({},(function(){var a=this,s=a._self._c;return s("ContentSlotsDistributor",{attrs:{"slot-key":a.$parent.slotKey}},[s("h2",{attrs:{id:"introduction"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#introduction"}},[a._v("#")]),a._v(" Introduction")]),a._v(" "),s("p",[a._v("In this post we will use the "),s("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk-cli",target:"_blank",rel:"noopener noreferrer"}},[a._v("bdk-cli"),s("OutboundLink")],1),a._v(" tool to demonstrate how to use the "),s("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk",target:"_blank",rel:"noopener noreferrer"}},[a._v("bdk"),s("OutboundLink")],1),a._v(" library to:")]),a._v(" "),s("ol",[s("li",[a._v("generate "),s("em",[a._v("testnet")]),a._v(" public and private keys")]),a._v(" "),s("li",[a._v("create "),s("a",{attrs:{href:"https://bitcoinops.org/en/topics/psbt/",target:"_blank",rel:"noopener noreferrer"}},[a._v("PSBT"),s("OutboundLink")],1),a._v("s that can be spent based on different "),s("a",{attrs:{href:"http://bitcoin.sipa.be/miniscript/",target:"_blank",rel:"noopener noreferrer"}},[a._v("miniscript spending policies"),s("OutboundLink")],1)]),a._v(" "),s("li",[a._v("cooperatively sign and finalize the resulting PSBTs")]),a._v(" "),s("li",[a._v("broadcast and confirm spending transactions")])]),a._v(" "),s("p",[a._v("The scenario we will simulate is a wallet with two spending policies:")]),a._v(" "),s("p",[a._v("A. "),s("strong",[a._v("three")]),a._v(" out of "),s("strong",[a._v("three")]),a._v(" signers must sign spending transaction input "),s("a",{attrs:{href:"https://developer.bitcoin.org/glossary.html",target:"_blank",rel:"noopener noreferrer"}},[a._v("UTXO"),s("OutboundLink")],1),a._v("s, "),s("strong",[a._v("OR")])]),a._v(" "),s("p",[a._v("B. "),s("strong",[a._v("two")]),a._v(" out of "),s("strong",[a._v("three")]),a._v(" signers must sign "),s("strong",[a._v("AND")]),a._v(" the input UTXOs must be a relative number of blocks older than the spending transaction's block")]),a._v(" "),s("p",[a._v("In a real-world wallet a longer relative time-lock would probably be used, but we chose a two block time-lock to make testing easier.")]),a._v(" "),s("p",[s("em",[a._v("Note: If you repeat these instructions on your own your extended keys, addresses, and other values will be different than shown in this post, but the end results should be the same.")])]),a._v(" "),s("h2",{attrs:{id:"initial-setup"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#initial-setup"}},[a._v("#")]),a._v(" Initial Setup")]),a._v(" "),s("h3",{attrs:{id:"step-0-install-a-recent-version-bdk-cli"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-0-install-a-recent-version-bdk-cli"}},[a._v("#")]),a._v(" Step 0: Install a recent version 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class-name"}},[a._v("help")]),a._v("\n")])])]),s("h3",{attrs:{id:"step-1-generate-private-extended-keys"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-1-generate-private-extended-keys"}},[a._v("#")]),a._v(" Step 1: Generate private extended keys")]),a._v(" "),s("p",[a._v("Generate new extended private keys for each of our wallet participants:")]),a._v(" "),s("div",{staticClass:"language-bash extra-class"},[s("pre",{pre:!0,attrs:{class:"language-bash"}},[s("code",[a._v("bdk-cli key generate "),s("span",{pre:!0,attrs:{class:"token operator"}},[a._v("|")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[a._v("tee")]),a._v(" alice-key.json\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),a._v("\n "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"fingerprint"')]),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"5adb4683"')]),a._v(",\n 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extra-class"},[s("pre",{pre:!0,attrs:{class:"language-bash"}},[s("code",[s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("export")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token assign-left variable"}},[a._v("ALICE_XPRV")]),s("span",{pre:!0,attrs:{class:"token operator"}},[a._v("=")]),s("span",{pre:!0,attrs:{class:"token variable"}},[s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$(")]),s("span",{pre:!0,attrs:{class:"token function"}},[a._v("cat")]),a._v(" alice-key.json "),s("span",{pre:!0,attrs:{class:"token operator"}},[a._v("|")]),a._v(" jq "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-r")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v("'.xprv'")]),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v(")")])]),a._v("\n\n"),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("export")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token assign-left 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function"}},[a._v("cat")]),a._v(" carol-key.json "),s("span",{pre:!0,attrs:{class:"token operator"}},[a._v("|")]),a._v(" jq "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-r")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v("'.xprv'")]),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v(")")])]),a._v("\n")])])]),s("h3",{attrs:{id:"step-3-derive-public-extended-keys"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-3-derive-public-extended-keys"}},[a._v("#")]),a._v(" Step 3: Derive public extended keys")]),a._v(" "),s("p",[a._v("For this example we are using the "),s("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0084.mediawiki",target:"_blank",rel:"noopener noreferrer"}},[a._v("BIP-84"),s("OutboundLink")],1),a._v(" key path: "),s("code",[a._v("m/84h/1h/0h/0/*")]),a._v(" to derive extended public keys to share with other wallet participants.")]),a._v(" "),s("p",[a._v("Note that the "),s("code",[a._v("key derive")]),a._v(" sub-command will generate a tpub for the last hardened node in the given derivation path. You'll also notice that "),s("code",[a._v("bdk-cli")]),a._v(" will returns our tpub with the key origin (fingerprint/path) added to it (the metadata part that looks like "),s("code",[a._v("[5adb4683/84'/1'/0']")]),a._v(" right before the tpub). This key origin information is not necessary in order to use a tpub and generate addresses, but it's good practice to include it because some signers require it.")]),a._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 builtin class-name"}},[a._v("export")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token assign-left variable"}},[a._v("ALICE_XPUB")]),s("span",{pre:!0,attrs:{class:"token operator"}},[a._v("=")]),s("span",{pre:!0,attrs:{class:"token variable"}},[s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$(")]),a._v("bdk-cli key derive "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--xprv")]),a._v(" $ALICE_XPRV "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--path")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v("\"m/84'/1'/0'/0\"")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[a._v("|")]),a._v(" jq "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-r")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('".xpub"')]),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v(")")])]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("echo")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("\\")]),a._v('"'),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$ALICE_XPUB")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("\\")]),a._v('"\n'),s("span",{pre:!0,attrs:{class:"token string"}},[a._v("\"[5adb4683/84'/1'/0']tpubDCyRBuncqwyAjSNiw1GWLmwQsWyhgPMEBpx3ZNpnCwZwf3HXerspTpaneN81KRxkwj8vjqH9pNWEPgNhen7dfE212SHfxBBbsCywxQGxvvu/0/*\"")]),a._v("\n\n"),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("export")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token assign-left variable"}},[a._v("BOB_XPUB")]),s("span",{pre:!0,attrs:{class:"token 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"),s("span",{pre:!0,attrs:{class:"token operator"}},[a._v("|")]),a._v(" jq "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-r")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('".xpub"')]),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v(")")])]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("echo")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("\\")]),a._v('"'),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$CAROL_XPUB")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("\\")]),a._v('"\n'),s("span",{pre:!0,attrs:{class:"token string"}},[a._v("\"[de41e56d/84'/1'/0']tpubDCdxmvzJ5QBjTN8oCjjyT2V58AyZvA1fkmCeZRC75QMoaHcVP2m45Bv3hmnR7ttAwkb2UNYyoXdHVt4gwBqRrJqLUU2JrM43HippxiWpHra/0/*\"")]),a._v("\n")])])]),s("h3",{attrs:{id:"step-4-create-wallet-descriptors-for-each-participant"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-4-create-wallet-descriptors-for-each-participant"}},[a._v("#")]),a._v(" Step 4: Create wallet descriptors for each participant")]),a._v(" "),s("p",[a._v("We used the "),s("a",{attrs:{href:"https://bitcoindevkit.org/bdk-cli/playground/",target:"_blank",rel:"noopener noreferrer"}},[a._v("BDK Playground Policy Compiler"),s("OutboundLink")],1),a._v(" to compile the "),s("a",{attrs:{href:"http://bitcoin.sipa.be/miniscript/",target:"_blank",rel:"noopener noreferrer"}},[a._v("miniscript"),s("OutboundLink")],1),a._v(" policy:")]),a._v(" "),s("p",[s("code",[a._v("thresh(3,pk(Alice),pk(Bob),pk(Carol),older(2))")])]),a._v(" "),s("p",[a._v("To the "),s("a",{attrs:{href:"https://bitcoindevkit.org/descriptors/",target:"_blank",rel:"noopener noreferrer"}},[a._v("output descriptor"),s("OutboundLink")],1),a._v(":")]),a._v(" "),s("p",[s("code",[a._v("wsh(thresh(3,pk(Alice),s:pk(Bob),s:pk(Carol),sdv:older(2)))")])]),a._v(" "),s("p",[a._v("This descriptor requires spending transaction inputs must be signed by all three signers, or by two signers and the spent UTXOs must be older than two blocks.")]),a._v(" "),s("p",[a._v("Each participant's descriptor only uses their own XPRV key plus the XPUB keys of the other participants.")]),a._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 builtin class-name"}},[a._v("export")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token assign-left variable"}},[a._v("ALICE_DESCRIPTOR")]),s("span",{pre:!0,attrs:{class:"token operator"}},[a._v("=")]),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"wsh(thresh(3,pk('),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$ALICE_XPRV")]),a._v("/84'/1'/0'/0/*),s:pk("),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BOB_XPUB")]),a._v("),s:pk("),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$CAROL_XPUB")]),a._v('),snl:older(2)))"')]),a._v("\n\n"),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("export")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token assign-left variable"}},[a._v("BOB_DESCRIPTOR")]),s("span",{pre:!0,attrs:{class:"token operator"}},[a._v("=")]),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"wsh(thresh(3,pk('),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$ALICE_XPUB")]),a._v("),s:pk("),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BOB_XPRV")]),a._v("/84'/1'/0'/0/*),s:pk("),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$CAROL_XPUB")]),a._v('),snl:older(2)))"')]),a._v("\n\n"),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("export")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token assign-left variable"}},[a._v("CAROL_DESCRIPTOR")]),s("span",{pre:!0,attrs:{class:"token operator"}},[a._v("=")]),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"wsh(thresh(3,pk('),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$ALICE_XPUB")]),a._v("),s:pk("),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BOB_XPUB")]),a._v("),s:pk("),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$CAROL_XPRV")]),a._v("/84'/1'/0'/0/*),snl:older(2)))\"")]),a._v("\n")])])]),s("h2",{attrs:{id:"policy-a-three-signatures"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#policy-a-three-signatures"}},[a._v("#")]),a._v(" Policy A. Three signatures")]),a._v(" "),s("h3",{attrs:{id:"step-1a-create-a-testnet-segwit0-receive-address"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-1a-create-a-testnet-segwit0-receive-address"}},[a._v("#")]),a._v(" Step 1a: Create a testnet "),s("a",{attrs:{href:"https://en.bitcoin.it/wiki/Segregated_Witness",target:"_blank",rel:"noopener noreferrer"}},[a._v("segwit0"),s("OutboundLink")],1),a._v(" receive address")]),a._v(" "),s("p",[a._v("This step can be done independently by Alice, Bob, or Carol.")]),a._v(" "),s("div",{staticClass:"language-bash extra-class"},[s("pre",{pre:!0,attrs:{class:"language-bash"}},[s("code",[a._v("bdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" carol "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$CAROL_DESCRIPTOR")]),a._v(" get_new_address\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),a._v("\n "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"address"')]),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"tb1qpqglt6yntay0se5vj3a7g36rql5pyzzp0w6jknfch2c0unwphsxs22g96e"')]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n")])])]),s("h3",{attrs:{id:"step-2a-send-testnet-bitcoin-from-a-faucet-to-receive-address"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-2a-send-testnet-bitcoin-from-a-faucet-to-receive-address"}},[a._v("#")]),a._v(" Step 2a: Send testnet bitcoin from a faucet to receive address")]),a._v(" "),s("p",[a._v("After a faucet payment is sent, use a testnet block explorer to confirm the transaction was included in a block.")]),a._v(" "),s("p",[s("a",{attrs:{href:"https://mempool.space/testnet/address/tb1qpqglt6yntay0se5vj3a7g36rql5pyzzp0w6jknfch2c0unwphsxs22g96e",target:"_blank",rel:"noopener noreferrer"}},[a._v("https://mempool.space/testnet/address/tb1qpqglt6yntay0se5vj3a7g36rql5pyzzp0w6jknfch2c0unwphsxs22g96e"),s("OutboundLink")],1)]),a._v(" "),s("h3",{attrs:{id:"step-3a-sync-participant-wallets-and-confirm-balance"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-3a-sync-participant-wallets-and-confirm-balance"}},[a._v("#")]),a._v(" Step 3a: Sync participant wallets and confirm balance")]),a._v(" "),s("p",[a._v("This step must be done by Alice, Bob, and Carol so their individual descriptor wallets know about the faucet transaction they will later be spending the output of.")]),a._v(" "),s("div",{staticClass:"language-bash extra-class"},[s("pre",{pre:!0,attrs:{class:"language-bash"}},[s("code",[a._v("bdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" alice "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token 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"),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"satoshi"')]),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[a._v("10000")]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n")])])]),s("h3",{attrs:{id:"step-4a-view-wallet-spending-policies"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-4a-view-wallet-spending-policies"}},[a._v("#")]),a._v(" Step 4a: View wallet spending policies")]),a._v(" "),s("p",[a._v("This can also be done by any wallet participant, as long as they have the same descriptor and extended public keys from the other particpants..")]),a._v(" "),s("div",{staticClass:"language-bash extra-class"},[s("pre",{pre:!0,attrs:{class:"language-bash"}},[s("code",[a._v("bdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" alice "),s("span",{pre:!0,attrs:{class:"token parameter 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"),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('".psbt"')]),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v(")")])]),a._v("\n")])])]),s("h3",{attrs:{id:"step-6a-sign-and-finalize-psbts"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-6a-sign-and-finalize-psbts"}},[a._v("#")]),a._v(" Step 6a: Sign and finalize PSBTs")]),a._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 comment"}},[a._v("# ALICE SIGNS")]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("export")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token assign-left variable"}},[a._v("ALICE_SIGNED_PSBT")]),s("span",{pre:!0,attrs:{class:"token operator"}},[a._v("=")]),s("span",{pre:!0,attrs:{class:"token variable"}},[s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$(")]),a._v("bdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" alice "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" $ALICE_DESCRIPTOR sign "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--psbt")]),a._v(" $UNSIGNED_PSBT "),s("span",{pre:!0,attrs:{class:"token operator"}},[a._v("|")]),a._v(" jq "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-r")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('".psbt"')]),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v(")")])]),a._v("\n\n"),s("span",{pre:!0,attrs:{class:"token comment"}},[a._v("# BOB SIGNS")]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v("export")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token assign-left variable"}},[a._v("ALICE_BOB_SIGNED_PSBT")]),s("span",{pre:!0,attrs:{class:"token operator"}},[a._v("=")]),s("span",{pre:!0,attrs:{class:"token variable"}},[s("span",{pre:!0,attrs:{class:"token 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variable"}},[s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$(")]),a._v("bdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" carol "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" $CAROL_DESCRIPTOR sign "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--psbt")]),a._v(" $ALICE_BOB_SIGNED_PSBT "),s("span",{pre:!0,attrs:{class:"token operator"}},[a._v("|")]),a._v(" jq "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-r")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('".psbt"')]),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v(")")])]),a._v("\n\n"),s("span",{pre:!0,attrs:{class:"token comment"}},[a._v("## PSBT is finalized")]),a._v("\nbdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" carol "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$CAROL_DESCRIPTOR")]),a._v(" sign "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--psbt")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$ALICE_BOB_SIGNED_PSBT")]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),a._v("\n "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"is_finalized"')]),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" true,\n "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"psbt"')]),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"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"')]),a._v("\n")])])]),s("h3",{attrs:{id:"step-7a-broadcast-finalized-psbt"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-7a-broadcast-finalized-psbt"}},[a._v("#")]),a._v(" Step 7a: Broadcast finalized PSBT")]),a._v(" "),s("div",{staticClass:"language-bash extra-class"},[s("pre",{pre:!0,attrs:{class:"language-bash"}},[s("code",[a._v("bdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" carol "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$CAROL_DESCRIPTOR")]),a._v(" broadcast "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--psbt")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$FINAL_PSBT")]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),a._v("\n "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"txid"')]),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"3b9a7ac610afc91f1d1a0dd844e609376278fe7210c69b7ef663c5a8e8308f3e"')]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n")])])]),s("h3",{attrs:{id:"step-8a-confirm-transaction-included-in-a-testnet-block"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-8a-confirm-transaction-included-in-a-testnet-block"}},[a._v("#")]),a._v(" Step 8a: Confirm transaction included in a testnet block")]),a._v(" "),s("p",[s("a",{attrs:{href:"https://mempool.space/testnet/tx/3b9a7ac610afc91f1d1a0dd844e609376278fe7210c69b7ef663c5a8e8308f3e",target:"_blank",rel:"noopener noreferrer"}},[a._v("https://mempool.space/testnet/tx/3b9a7ac610afc91f1d1a0dd844e609376278fe7210c69b7ef663c5a8e8308f3e"),s("OutboundLink")],1)]),a._v(" "),s("p",[a._v("And new wallet balance is now zero.")]),a._v(" "),s("div",{staticClass:"language-bash extra-class"},[s("pre",{pre:!0,attrs:{class:"language-bash"}},[s("code",[a._v("bdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" alice "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$ALICE_DESCRIPTOR")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[a._v("sync")]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\nbdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" alice "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$ALICE_DESCRIPTOR")]),a._v(" get_balance\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),a._v("\n "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"satoshi"')]),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[a._v("0")]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n")])])]),s("h4",{attrs:{id:"done-"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#done-"}},[a._v("#")]),a._v(" DONE!")]),a._v(" "),s("h2",{attrs:{id:"policy-b-two-signatures-after-a-relative-time-lock"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#policy-b-two-signatures-after-a-relative-time-lock"}},[a._v("#")]),a._v(" Policy B. Two signatures after a relative time lock")]),a._v(" "),s("p",[a._v("Now we will use the same extended private and public keys, and the same descriptors to receive and spend testnet bitcoin using only two of our participants signatures after the transaction input's relative time-lock has expired.")]),a._v(" "),s("h3",{attrs:{id:"step-1b-create-a-new-testnet-receive-address"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-1b-create-a-new-testnet-receive-address"}},[a._v("#")]),a._v(" Step 1b: Create a new testnet receive address")]),a._v(" "),s("p",[a._v("The receive address can still be generated by Alice, Bob, or Carol.")]),a._v(" "),s("div",{staticClass:"language-bash extra-class"},[s("pre",{pre:!0,attrs:{class:"language-bash"}},[s("code",[a._v("bdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" alice "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$ALICE_DESCRIPTOR")]),a._v(" get_new_address\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),a._v("\n "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"address"')]),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"tb1q886w2zmtakwxpngs9kn7y0a7tvd6e24u58sse2sv92zrjpnenfhqtfnmw9"')]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n")])])]),s("h3",{attrs:{id:"step-2b-fund-new-address-from-testnet-faucet"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-2b-fund-new-address-from-testnet-faucet"}},[a._v("#")]),a._v(" Step 2b: Fund new address from testnet faucet")]),a._v(" "),s("p",[a._v("After the faucet payment is sent, confirm using a testnet block explorer to verify the transaction was included in a block.")]),a._v(" "),s("p",[s("a",{attrs:{href:"https://mempool.space/testnet/address/tb1q886w2zmtakwxpngs9kn7y0a7tvd6e24u58sse2sv92zrjpnenfhqtfnmw9",target:"_blank",rel:"noopener noreferrer"}},[a._v("https://mempool.space/testnet/address/tb1q886w2zmtakwxpngs9kn7y0a7tvd6e24u58sse2sv92zrjpnenfhqtfnmw9"),s("OutboundLink")],1)]),a._v(" "),s("h3",{attrs:{id:"step-3b-sync-wallet-and-confirm-wallet-balance"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-3b-sync-wallet-and-confirm-wallet-balance"}},[a._v("#")]),a._v(" Step 3b: Sync wallet and confirm wallet balance")]),a._v(" "),s("p",[a._v("This step must be done by Alice and Bob so their individual descriptor wallets know about the faucet transaction they will later be spending the output of.")]),a._v(" "),s("div",{staticClass:"language-bash extra-class"},[s("pre",{pre:!0,attrs:{class:"language-bash"}},[s("code",[a._v("bdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" alice "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$ALICE_DESCRIPTOR")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[a._v("sync")]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\nbdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" alice "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$ALICE_DESCRIPTOR")]),a._v(" get_balance\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),a._v("\n "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"satoshi"')]),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[a._v("10000")]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n\nbdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" bob "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BOB_DESCRIPTOR")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[a._v("sync")]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\nbdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" bob "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$BOB_DESCRIPTOR")]),a._v(" get_balance\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("{")]),a._v("\n "),s("span",{pre:!0,attrs:{class:"token string"}},[a._v('"satoshi"')]),s("span",{pre:!0,attrs:{class:"token builtin class-name"}},[a._v(":")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[a._v("10000")]),a._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[a._v("}")]),a._v("\n\n"),s("span",{pre:!0,attrs:{class:"token comment"}},[a._v("# NO CAROL SHE LOST HER KEY!")]),a._v("\n")])])]),s("h3",{attrs:{id:"step-4b-create-spending-transaction"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#step-4b-create-spending-transaction"}},[a._v("#")]),a._v(" Step 4b: Create spending transaction")]),a._v(" "),s("p",[a._v("This spending transaction uses Alice and Bob's keys plus a two block relative time-lock, see above "),s("a",{attrs:{href:"#step-4a-view-wallet-spending-policies"}},[a._v("Step 4a")]),a._v(" for the policy id. The transaction can be created by Alice or Bob.")]),a._v(" "),s("p",[a._v("A time based relative time-lock can be used instead of one based on blocks but is slightly more complicated to calculate. See\n"),s("a",{attrs:{href:"https://github.com/bitcoin/bips/blob/master/bip-0068.mediawiki#specification",target:"_blank",rel:"noopener noreferrer"}},[a._v("BIP-68"),s("OutboundLink")],1),a._v(" for the details.")]),a._v(" "),s("div",{staticClass:"language-bash extra-class"},[s("pre",{pre:!0,attrs:{class:"language-bash"}},[s("code",[a._v("bdk-cli wallet "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-w")]),a._v(" alice "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-d")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[a._v("$ALICE_DESCRIPTOR")]),a._v(" create_tx "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("-a")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--to")]),a._v(" tb1qm5tfegjevj27yvvna9elym9lnzcf0zraxgl8z2:0 "),s("span",{pre:!0,attrs:{class:"token parameter variable"}},[a._v("--external_policy")]),a._v(" "),s("span",{pre:!0,attrs:{class:"token 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If you're using a physical HW, connect it to your laptop; if it's an emulator, start it.")]),t._v(" "),s("p",[t._v("We start by printing all the available hardware wallets:")]),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(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Result")]),s("span",{pre:!0,attrs:{class:"token operator"}},[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(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Box")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("dyn")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("std"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),t._v("error"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Error")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v(">>")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Listing all the available hardware wallet devices...")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" devices "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("HWIClient")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("enumerate")]),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 operator"}},[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(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("devices"),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("Ok")]),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("When run, it should print an array of "),s("code",[t._v("HWIDevice")]),t._v(" with one element:")]),t._v(" "),s("div",{staticClass:"language-bash extra-class"},[s("pre",{pre:!0,attrs:{class:"language-bash"}},[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("HWIDevice "),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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Common issues are: the device is locked (unlock with the pin and open the "Bitcoin" app, if needed) or the udev rules aren\'t set.')]),t._v(" "),s("h2",{attrs:{id:"receiving-funds"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#receiving-funds"}},[t._v("#")]),t._v(" Receiving funds")]),t._v(" "),s("p",[t._v("In order to be able to receive funds we need to create the BDK "),s("code",[t._v("Wallet")]),t._v(" using the HW descriptors.")]),t._v(" "),s("p",[t._v("We start by creating a "),s("code",[t._v("HWIClient")]),t._v(" from the "),s("code",[t._v("HWIDevice")]),t._v(" we found in the last step:")]),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 comment"}},[t._v("// Listing all the available hardware wallet devices...")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" devices "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("HWIClient")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("enumerate")]),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 operator"}},[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(" first_device "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" devices\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("first")]),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 function"}},[t._v("expect")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"No devices found. Either plug in a hardware wallet, or start a simulator."')]),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 comment"}},[t._v("// ...and creating a client out of the first one")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" client "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("HWIClient")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("get_client")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("first_device"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token boolean"}},[t._v("true")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("HWIChain")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Test")]),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 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('"Look what I found, a {}!"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" first_device"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("model"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),s("p",[t._v("We then use the 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wallet..."')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\nwallet"),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 operator"}},[t._v("&")]),t._v("blockchain"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("SyncOptions")]),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(")")]),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 punctuation"}},[t._v(";")]),t._v("\n\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("if")]),t._v(" balance"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("get_total")]),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 operator"}},[t._v("<")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("10000")]),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("(")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v("\"Send some sats from the u01.net testnet faucet to address '{addr}'.\\nFaucet URL: https://bitcoinfaucet.uo1.net/?to={addr}\"")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n addr "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" deposit_address"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("address\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("return")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Ok")]),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 punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token 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You don't have to wait for them to be confirmed before going to the next step.")]),t._v(" "),s("h2",{attrs:{id:"spending-funds"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#spending-funds"}},[t._v("#")]),t._v(" Spending funds")]),t._v(" "),s("p",[t._v("We're going to send back the sats we just received to the testnet faucet. 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See you there!")])])}),[],!1,null,null,null);s.default=e.exports}}]); \ No newline at end of file +(window.webpackJsonp=window.webpackJsonp||[]).push([[67],{418: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("The bitcoindevkit organization maintains "),s("a",{attrs:{href:"https://github.com/bitcoindevkit/rust-hwi",target:"_blank",rel:"noopener noreferrer"}},[t._v("rust-hwi"),s("OutboundLink")],1),t._v(", a Rust wrapper around Bitcoin Core's "),s("a",{attrs:{href:"https://github.com/bitcoin-core/HWI",target:"_blank",rel:"noopener noreferrer"}},[t._v("HWI"),s("OutboundLink")],1),t._v(". rust-hwi makes it possible to use hardware wallets with BDK, which is exactly what we're going to do in this tutorial.")]),t._v(" "),s("h2",{attrs:{id:"prerequisites"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#prerequisites"}},[t._v("#")]),t._v(" Prerequisites")]),t._v(" "),s("p",[t._v("To follow along you'll need the "),s("a",{attrs:{href:"https://pypi.org/project/hwi/",target:"_blank",rel:"noopener noreferrer"}},[s("code",[t._v("hwi")]),s("OutboundLink")],1),t._v(" python package installed on your system, and a hardware wallet.")]),t._v(" "),s("p",[t._v("Never use a hardware wallet with real funds for testing! 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If you're using a physical HW, connect it to your laptop; if it's an emulator, start it.")]),t._v(" "),s("p",[t._v("We start by printing all the available hardware wallets:")]),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(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Result")]),s("span",{pre:!0,attrs:{class:"token operator"}},[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(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Box")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("dyn")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("std"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),t._v("error"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")])]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Error")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v(">>")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Listing all the available hardware wallet devices...")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" devices "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("HWIClient")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("enumerate")]),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 operator"}},[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(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),t._v("devices"),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("Ok")]),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("When run, it should print an array of "),s("code",[t._v("HWIDevice")]),t._v(" with one element:")]),t._v(" "),s("div",{staticClass:"language-bash extra-class"},[s("pre",{pre:!0,attrs:{class:"language-bash"}},[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("HWIDevice "),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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Common issues are: the device is locked (unlock with the pin and open the "Bitcoin" app, if needed) or the udev rules aren\'t set.')]),t._v(" "),s("h2",{attrs:{id:"receiving-funds"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#receiving-funds"}},[t._v("#")]),t._v(" Receiving funds")]),t._v(" "),s("p",[t._v("In order to be able to receive funds we need to create the BDK "),s("code",[t._v("Wallet")]),t._v(" using the HW descriptors.")]),t._v(" "),s("p",[t._v("We start by creating a "),s("code",[t._v("HWIClient")]),t._v(" from the "),s("code",[t._v("HWIDevice")]),t._v(" we found in the last step:")]),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 comment"}},[t._v("// Listing all the available hardware wallet devices...")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" devices "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("HWIClient")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("enumerate")]),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 operator"}},[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(" first_device "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" devices\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("first")]),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 function"}},[t._v("expect")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"No devices found. Either plug in a hardware wallet, or start a simulator."')]),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 comment"}},[t._v("// ...and creating a client out of the first one")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" client "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("HWIClient")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("get_client")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("first_device"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token boolean"}},[t._v("true")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("HWIChain")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Test")]),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 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('"Look what I found, a {}!"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" first_device"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("model"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),s("p",[t._v("We then use the 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wallet..."')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\nwallet"),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 operator"}},[t._v("&")]),t._v("blockchain"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("SyncOptions")]),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(")")]),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 punctuation"}},[t._v(";")]),t._v("\n\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("if")]),t._v(" balance"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("get_total")]),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 operator"}},[t._v("<")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("10000")]),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("(")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v("\"Send some sats from the u01.net testnet faucet to address '{addr}'.\\nFaucet URL: https://bitcoinfaucet.uo1.net/?to={addr}\"")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n addr "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" deposit_address"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("address\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("return")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Ok")]),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 punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token 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You don't have to wait for them to be confirmed before going to the next step.")]),t._v(" "),s("h2",{attrs:{id:"spending-funds"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#spending-funds"}},[t._v("#")]),t._v(" Spending funds")]),t._v(" "),s("p",[t._v("We're going to send back the sats we just received to the testnet faucet. 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See you there!")])])}),[],!1,null,null,null);s.default=e.exports}}]); \ No newline at end of file diff --git a/assets/js/68.139a2d38.js b/assets/js/68.447d7bfd.js similarity index 92% rename from assets/js/68.139a2d38.js rename to assets/js/68.447d7bfd.js index 54c481186e..bd2d4ec772 100644 --- a/assets/js/68.139a2d38.js +++ b/assets/js/68.447d7bfd.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[68],{418:function(t,e,a){"use strict";a.r(e);var n=a(7),r=Object(n.a)({},(function(){var t=this,e=t._self._c;return e("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[e("h1",{attrs:{id:"bdk-cli"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#bdk-cli"}},[t._v("#")]),t._v(" BDK-CLI")]),t._v(" "),e("p",[t._v("The "),e("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk-cli",target:"_blank",rel:"noopener noreferrer"}},[t._v("bdk-cli"),e("OutboundLink")],1),t._v(" repo has an example interactive shell built\nusing the "),e("code",[t._v("bdk")]),t._v(" library called "),e("code",[t._v("bdk-cli")]),t._v(" that acts both as a reference implementation of a wallet\nand a tool to quickly experiment with descriptors and transactions.")])])}),[],!1,null,null,null);e.default=r.exports}}]); \ No newline at end of file +(window.webpackJsonp=window.webpackJsonp||[]).push([[68],{417:function(t,e,a){"use strict";a.r(e);var n=a(7),r=Object(n.a)({},(function(){var t=this,e=t._self._c;return e("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[e("h1",{attrs:{id:"bdk-cli"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#bdk-cli"}},[t._v("#")]),t._v(" BDK-CLI")]),t._v(" "),e("p",[t._v("The "),e("a",{attrs:{href:"https://github.com/bitcoindevkit/bdk-cli",target:"_blank",rel:"noopener noreferrer"}},[t._v("bdk-cli"),e("OutboundLink")],1),t._v(" repo has an example interactive shell built\nusing the "),e("code",[t._v("bdk")]),t._v(" library called "),e("code",[t._v("bdk-cli")]),t._v(" that acts both as a reference implementation of a wallet\nand a tool to quickly experiment with descriptors and transactions.")])])}),[],!1,null,null,null);e.default=r.exports}}]); \ No newline at end of file diff --git a/assets/js/75.dcd0cdde.js b/assets/js/75.24e75de4.js similarity index 98% rename from assets/js/75.dcd0cdde.js rename to assets/js/75.24e75de4.js index 47d09079f8..787113498d 100644 --- a/assets/js/75.dcd0cdde.js +++ b/assets/js/75.24e75de4.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[75],{426:function(t,e,a){"use strict";a.r(e);var s=a(7),r=Object(s.a)({},(function(){var t=this,e=t._self._c;return e("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[e("h1",{attrs:{id:"regtest"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#regtest"}},[t._v("#")]),t._v(" Regtest")]),t._v(" "),e("p",[t._v("Running the "),e("code",[t._v("bdk-cli")]),t._v(" tool in regtest requires having a local Electrum server set-up. There are two main implementations, "),e("a",{attrs:{href:"https://github.com/romanz/electrs",target:"_blank",rel:"noopener noreferrer"}},[e("code",[t._v("electrs")]),e("OutboundLink")],1),t._v(" in Rust and "),e("a",{attrs:{href:"https://github.com/spesmilo/electrumx",target:"_blank",rel:"noopener noreferrer"}},[e("code",[t._v("ElectrumX")]),e("OutboundLink")],1),t._v(" in Python. 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They can be especially helpful when working with multisigs or even\nmore complex scripts, where the structure of the script itself is not trivial. They are a big step forward in making wallets more portable across different tools and apps, because for the first time they create a common\nlanguage to describe a full bitcoin script that developers can use and integrate in their software.')]),t._v(" "),v("p",[t._v("The ecosystem around descriptors is still very much in its early stage, but they are starting to see some adoption in "),v("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md",target:"_blank",rel:"noopener noreferrer"}},[t._v("Bitcoin Core"),v("OutboundLink")],1),t._v(' and other projects. 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The Foundation is organized and operated exclusively for charitable, educational, and scientific purposes within the meaning of 501c(3) of the Internal Revenue Code.")]),e._v(" "),t("p",[e._v("The Foundation aims to achieve this mission by funding the developers who contribute to and maintain the Bitcoin Dev Kit software libraries, documentation, and related infrastructure. We independently raise funds on behalf of the development team, and recruit for, fund, and operate the grant program.")]),e._v(" "),t("h2",{attrs:{id:"board"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#board"}},[e._v("#")]),e._v(" Board")]),e._v(" "),t("p",[e._v("The current BDK Foundation board is made up of five directors. The board members are all unpaid volunteer positions. 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The Foundation is organized and operated exclusively for charitable, educational, and scientific purposes within the meaning of 501c(3) of the Internal Revenue Code.")]),e._v(" "),t("p",[e._v("The Foundation aims to achieve this mission by funding the developers who contribute to and maintain the Bitcoin Dev Kit software libraries, documentation, and related infrastructure. We independently raise funds on behalf of the development team, and recruit for, fund, and operate the grant program.")]),e._v(" "),t("h2",{attrs:{id:"board"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#board"}},[e._v("#")]),e._v(" Board")]),e._v(" "),t("p",[e._v("The current BDK Foundation board is made up of five directors. The board members are all unpaid volunteer positions. 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The five current officers are:")]),e._v(" "),t("ul",[t("li",[e._v("Steve Myers, President")]),e._v(" "),t("li",[e._v("Daniela Brozzoni, Vice-President")]),e._v(" "),t("li",[e._v("Joe Wood, Treasurer")]),e._v(" "),t("li",[e._v("thunderbiscuit, Secretary")]),e._v(" "),t("li",[e._v("Evan Lin, At-large")])])])}),[],!1,null,null,null);t.default=a.exports}}]); \ No newline at end of file diff --git a/assets/js/80.9c59a7bc.js b/assets/js/80.79a4d68e.js similarity index 99% rename from assets/js/80.9c59a7bc.js rename to assets/js/80.79a4d68e.js index 4da5cf9ac2..0d1b7fa324 100644 --- a/assets/js/80.9c59a7bc.js +++ b/assets/js/80.79a4d68e.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[80],{428:function(t,a,e){"use strict";e.r(a);var s=e(7),n=Object(s.a)({},(function(){var t=this,a=t._self._c;return a("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[a("h1",{attrs:{id:"bitcoin-dev-kit"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#bitcoin-dev-kit"}},[t._v("#")]),t._v(" Bitcoin Dev Kit")]),t._v(" "),a("p",[t._v("The "),a("a",{attrs:{href:"https://github.com/bitcoindevkit",target:"_blank",rel:"noopener noreferrer"}},[t._v("Bitcoin Dev Kit (BDK)"),a("OutboundLink")],1),t._v(" project (originally called Magical Bitcoin 🧙) aims to build a collection of tools and libraries that are designed to be a solid foundation for cross platform Bitcoin wallets, along with a fully working "),a("em",[t._v("reference implementation")]),t._v(" wallets for various platforms.\nAll BDK components are designed to be lightweight and modular so that they can be adapted for virtually any use-case: from single-sig mobile wallets to multi-billion-dollar cold storage vaults.")]),t._v(" "),a("p",[t._v("The main long-term goal is to concentrate the development efforts of multiple people and companies into one open source and very well reviewed project, instead of dispersing them over multiple closed/semi-closed or\npoorly designed projects.")]),t._v(" "),a("p",[t._v('While some parts of the library are still considered "experimental" (check the docs for more info), the core '),a("a",{attrs:{href:"https://docs.rs/bdk/latest/bdk/wallet/struct.Wallet.html",target:"_blank",rel:"noopener noreferrer"}},[a("code",[t._v("Wallet")]),a("OutboundLink")],1),t._v(" architecture is now considered stable. We still can't commit to keeping this same exact API forever,\nbut we are not expecting to do any major breaking change in that area.")]),t._v(" "),a("p",[t._v("If you want to try out the library for your projects, now it's finally a good time to do it! You can start by checking out the "),a("RouterLink",{attrs:{to:"/getting-started/"}},[t._v('"getting started"')]),t._v(" section in our blog or joining our "),a("a",{attrs:{href:"https://discord.gg/dstn4dQ",target:"_blank",rel:"noopener noreferrer"}},[t._v("Discord"),a("OutboundLink")],1),t._v("\nserver to chat with us.")],1),t._v(" "),a("h2",{attrs:{id:"initial-configuration"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#initial-configuration"}},[t._v("#")]),t._v(" Initial Configuration")]),t._v(" "),a("p",[t._v("Most Rust projects use Cargo to download and build the libraries the code depends on. 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It has been compiled to WebAssembly and can be used directly from the browser. See the "),a("a",{attrs:{href:"/bdk-cli/playground"}},[t._v("playground")]),t._v(" section to give it a try!")]),t._v(" "),a("p",[t._v("The playground relies on "),a("a",{attrs:{href:"https://blockstream.info",target:"_blank",rel:"noopener noreferrer"}},[t._v("Esplora"),a("OutboundLink")],1),t._v(" to monitor the blockchain and is currently locked in testnet-only mode, for obvious safety reasons. The native command line tool can also be used in regtest mode when installed on\na computer. 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It may sound disappointing, but there isn\'t, in fact,\nany real magic in this wallet: the generalization is achieved thanks to '),a("a",{attrs:{href:"https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md",target:"_blank",rel:"noopener noreferrer"}},[a("em",[t._v("descriptors")]),a("OutboundLink")],1),t._v(", that are now slowly starting to see adoption in a few other Bitcoin projects as well.")]),t._v(" "),a("p",[t._v("The author of this project strongly believes descriptors will be a big part of the future generation of Bitcoin wallets, since they provide a very flexible scripting language that can also be extended as the\ntechnology and tooling of Bitcoin evolves and changes (Schnorr signatures, Taproot, etc).")]),t._v(" "),a("p",[t._v("To learn more, check out the specific "),a("a",{attrs:{href:"/descriptors"}},[t._v("Descriptors section")]),t._v(".")]),t._v(" "),a("p",[t._v("The following code shows how to generate a random mnemonic, the extended (and deterministic) 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Documentation"),a("OutboundLink")],1),t._v(".")])])}),[],!1,null,null,null);a.default=n.exports}}]); \ No newline at end of file +(window.webpackJsonp=window.webpackJsonp||[]).push([[80],{429:function(t,a,e){"use strict";e.r(a);var s=e(7),n=Object(s.a)({},(function(){var t=this,a=t._self._c;return a("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[a("h1",{attrs:{id:"bitcoin-dev-kit"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#bitcoin-dev-kit"}},[t._v("#")]),t._v(" Bitcoin Dev Kit")]),t._v(" "),a("p",[t._v("The "),a("a",{attrs:{href:"https://github.com/bitcoindevkit",target:"_blank",rel:"noopener noreferrer"}},[t._v("Bitcoin Dev Kit (BDK)"),a("OutboundLink")],1),t._v(" project (originally called Magical Bitcoin 🧙) aims to build a collection of tools and libraries that are designed to be a solid foundation for cross platform Bitcoin wallets, along with a fully working "),a("em",[t._v("reference implementation")]),t._v(" wallets for various platforms.\nAll BDK 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keys",slug:"step-2-extract-private-extended-keys"},{level:3,title:"Step 3: Derive public extended keys",slug:"step-3-derive-public-extended-keys"},{level:3,title:"Step 4: Create wallet descriptors for each participant",slug:"step-4-create-wallet-descriptors-for-each-participant"},{level:2,title:"Policy A. Three signatures",slug:"policy-a-three-signatures"},{level:3,title:"Step 1a: Create a testnet segwit0 receive address",slug:"step-1a-create-a-testnet-segwit0-receive-address"},{level:3,title:"Step 2a: Send testnet bitcoin from a faucet to receive address",slug:"step-2a-send-testnet-bitcoin-from-a-faucet-to-receive-address"},{level:3,title:"Step 3a: Sync participant wallets and confirm balance",slug:"step-3a-sync-participant-wallets-and-confirm-balance"},{level:3,title:"Step 4a: View wallet spending policies",slug:"step-4a-view-wallet-spending-policies"},{level:3,title:"Step 5a: Create spending transaction",slug:"step-5a-create-spending-transaction"},{level:3,title:"Step 6a: Sign and finalize PSBTs",slug:"step-6a-sign-and-finalize-psbts"},{level:3,title:"Step 7a: Broadcast finalized PSBT",slug:"step-7a-broadcast-finalized-psbt"},{level:3,title:"Step 8a: Confirm transaction included in a testnet block",slug:"step-8a-confirm-transaction-included-in-a-testnet-block"},{level:2,title:"Policy B. 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has an example interactive shell built\nusing the `bdk` library called `bdk-cli` that acts both as a reference implementation of a wallet\nand a tool to quickly experiment with descriptors and transactions."},{name:"twitter:url",content:"https://bitcoindevkit.org/bdk-cli/"},{name:"twitter:card",content:"summary"},{name:"twitter:image",content:"https://bitcoindevkit.org/card.png"},{name:"twitter:label2",content:"Filed under"},{name:"twitter:data2",content:"Bitcoin, Bitcoin Dev Kit, BDK"},{property:"article:tag",content:"Bitcoin"},{property:"article:tag",content:"Bitcoin Dev Kit"},{property:"article:tag",content:"BDK"}]},regularPath:"/bdk-cli/",relativePath:"bdk-cli/README.md",key:"v-009133c8",path:"/bdk-cli/",codeSwitcherOptions:{},lastUpdated:"4/20/2024, 7:43:43 AM",lastUpdatedTimestamp:1713599023e3},{title:"Compiler",frontmatter:{meta:[{property:"og:site_name",content:"Bitcoin Dev Kit Documentation"},{property:"og:title",content:"Compiler"},{property:"og:description",content:'If you want to play around with more complicated spending policies, you\'ll start to find it harder and harder to manually create the descriptors. This is where the miniscript compiler comes in! The `bdk` library\nincludes a very simple compiler that can produce a descriptor given a spending policy. The syntax used to encode the spending policy is very well described in this pagehttp://bitcoin.sipa.be/miniscript/,\nspecifically in the "Policy to Miniscript compiler". The compiler included in BDK does basically the same job, but produces descriptors for `rust-miniscript` that have some minor differences from\nthe ones made by the C++ implementation used in that website.'},{property:"og:type",content:"article"},{property:"og:url",content:"https://bitcoindevkit.org/bdk-cli/compiler/"},{property:"og:image",content:"https://bitcoindevkit.org/card.png"},{name:"twitter:title",content:"Compiler"},{name:"twitter:description",content:'If you want to play around with more complicated spending policies, you\'ll start to find it harder and harder to manually create the descriptors. This is where the miniscript compiler comes in! The `bdk` library\nincludes a very simple compiler that can produce a descriptor given a spending policy. The syntax used to encode the spending policy is very well described in this pagehttp://bitcoin.sipa.be/miniscript/,\nspecifically in the "Policy to Miniscript compiler". The compiler included in BDK does basically the same job, but produces descriptors for `rust-miniscript` that have some minor differences from\nthe ones made by the C++ implementation used in that website.'},{name:"twitter:url",content:"https://bitcoindevkit.org/bdk-cli/compiler/"},{name:"twitter:card",content:"summary"},{name:"twitter:image",content:"https://bitcoindevkit.org/card.png"},{name:"twitter:label2",content:"Filed under"},{name:"twitter:data2",content:"Bitcoin, Bitcoin Dev Kit, BDK"},{property:"article:tag",content:"Bitcoin"},{property:"article:tag",content:"Bitcoin Dev Kit"},{property:"article:tag",content:"BDK"}]},regularPath:"/bdk-cli/compiler.html",relativePath:"bdk-cli/compiler.md",key:"v-7a315e41",path:"/bdk-cli/compiler/",headers:[{level:2,title:"Introduction",slug:"introduction"},{level:2,title:"Installation",slug:"installation"},{level:2,title:"Usage",slug:"usage"},{level:2,title:"Example",slug:"example"},{level:2,title:"Troubleshooting",slug:"troubleshooting"}],codeSwitcherOptions:{},lastUpdated:"4/20/2024, 7:43:43 AM",lastUpdatedTimestamp:1713599023e3},{title:"Concept",frontmatter:{meta:[{property:"og:site_name",content:"Bitcoin Dev Kit Documentation"},{property:"og:title",content:"Concept"},{property:"og:description",content:"Now, in order to better grasp some of the design choices made by BDK, it's important to understand the main concept driving the development of this project, and the goal that it's trying to\nachieve."},{property:"og:type",content:"article"},{property:"og:url",content:"https://bitcoindevkit.org/bdk-cli/concept/"},{property:"og:image",content:"https://bitcoindevkit.org/card.png"},{name:"twitter:title",content:"Concept"},{name:"twitter:description",content:"Now, in order to better grasp some of the design choices made by BDK, it's important to understand the main concept driving the development of this project, and the goal that it's trying to\nachieve."},{name:"twitter:url",content:"https://bitcoindevkit.org/bdk-cli/concept/"},{name:"twitter:card",content:"summary"},{name:"twitter:image",content:"https://bitcoindevkit.org/card.png"},{name:"twitter:label2",content:"Filed under"},{name:"twitter:data2",content:"Bitcoin, Bitcoin Dev Kit, BDK"},{property:"article:tag",content:"Bitcoin"},{property:"article:tag",content:"Bitcoin Dev Kit"},{property:"article:tag",content:"BDK"}]},regularPath:"/bdk-cli/concept.html",relativePath:"bdk-cli/concept.md",key:"v-f611a14e",path:"/bdk-cli/concept/",codeSwitcherOptions:{},lastUpdated:"4/20/2024, 7:43:43 AM",lastUpdatedTimestamp:1713599023e3},{title:"Installation",frontmatter:{meta:[{property:"og:site_name",content:"Bitcoin Dev Kit Documentation"},{property:"og:title",content:"Installation"},{property:"og:description",content:"The only requirement to run the `bdk-cli` tool is a Linux/macOS system with a fairly recent Rust\ntoolchain installed. Since Linux distros tend to lag behind with updates, the quickest way to\ninstall the Rust compiler and Cargo is rustup.rshttps://rustup.rs/. You can head there and\nfollow their instructions, after which you can test if everything went fine by running"},{property:"og:type",content:"article"},{property:"og:url",content:"https://bitcoindevkit.org/bdk-cli/installation/"},{property:"og:image",content:"https://bitcoindevkit.org/card.png"},{name:"twitter:title",content:"Installation"},{name:"twitter:description",content:"The only requirement to run the `bdk-cli` tool is a Linux/macOS system with a fairly recent Rust\ntoolchain installed. Since Linux distros tend to lag behind with updates, the quickest way to\ninstall the Rust compiler and Cargo is rustup.rshttps://rustup.rs/. You can head there and\nfollow their instructions, after which you can test if everything went fine by running"},{name:"twitter:url",content:"https://bitcoindevkit.org/bdk-cli/installation/"},{name:"twitter:card",content:"summary"},{name:"twitter:image",content:"https://bitcoindevkit.org/card.png"},{name:"twitter:label2",content:"Filed under"},{name:"twitter:data2",content:"Bitcoin, Bitcoin Dev Kit, BDK"},{property:"article:tag",content:"Bitcoin"},{property:"article:tag",content:"Bitcoin Dev Kit"},{property:"article:tag",content:"BDK"}]},regularPath:"/bdk-cli/installation.html",relativePath:"bdk-cli/installation.md",key:"v-3acb6e6a",path:"/bdk-cli/installation/",headers:[{level:2,title:"Requirements",slug:"requirements"},{level:2,title:"Installing the bdk-cli tool",slug:"installing-the-bdk-cli-tool"}],codeSwitcherOptions:{},lastUpdated:"4/20/2024, 7:43:43 AM",lastUpdatedTimestamp:1713599023e3},{title:"Interface",frontmatter:{meta:[{property:"og:site_name",content:"Bitcoin Dev Kit Documentation"},{property:"og:title",content:"Interface"},{property:"og:description",content:"Remember the `bdk-cli --help` command you ran before? Let's analyze its output here to figure out the interface:"},{property:"og:type",content:"article"},{property:"og:url",content:"https://bitcoindevkit.org/bdk-cli/interface/"},{property:"og:image",content:"https://bitcoindevkit.org/card.png"},{name:"twitter:title",content:"Interface"},{name:"twitter:description",content:"Remember the `bdk-cli --help` command you ran before? Let's analyze its output here to figure out the interface:"},{name:"twitter:url",content:"https://bitcoindevkit.org/bdk-cli/interface/"},{name:"twitter:card",content:"summary"},{name:"twitter:image",content:"https://bitcoindevkit.org/card.png"},{name:"twitter:label2",content:"Filed under"},{name:"twitter:data2",content:"Bitcoin, Bitcoin Dev Kit, BDK"},{property:"article:tag",content:"Bitcoin"},{property:"article:tag",content:"Bitcoin Dev 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7:43:43 AM",lastUpdatedTimestamp:1713599023e3},{title:"Introduction",frontmatter:{meta:[{property:"og:site_name",content:"Bitcoin Dev Kit Documentation"},{property:"og:title",content:"Introduction"},{property:"og:description",content:"This can also be used as an example application to create your own command line bitcoin wallet tool using bdk."},{property:"og:type",content:"article"},{property:"og:url",content:"https://bitcoindevkit.org/bdk-cli/introduction/"},{property:"og:image",content:"https://bitcoindevkit.org/card.png"},{name:"twitter:title",content:"Introduction"},{name:"twitter:description",content:"This can also be used as an example application to create your own command line bitcoin wallet tool using bdk."},{name:"twitter:url",content:"https://bitcoindevkit.org/bdk-cli/introduction/"},{name:"twitter:card",content:"summary"},{name:"twitter:image",content:"https://bitcoindevkit.org/card.png"},{name:"twitter:label2",content:"Filed under"},{name:"twitter:data2",content:"Bitcoin, 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participant",slug:"step-4-create-wallet-descriptors-for-each-participant"},{level:2,title:"Policy A. Three signatures",slug:"policy-a-three-signatures"},{level:3,title:"Step 1a: Create a testnet segwit0 receive address",slug:"step-1a-create-a-testnet-segwit0-receive-address"},{level:3,title:"Step 2a: Send testnet bitcoin from a faucet to receive address",slug:"step-2a-send-testnet-bitcoin-from-a-faucet-to-receive-address"},{level:3,title:"Step 3a: Sync participant wallets and confirm balance",slug:"step-3a-sync-participant-wallets-and-confirm-balance"},{level:3,title:"Step 4a: View wallet spending policies",slug:"step-4a-view-wallet-spending-policies"},{level:3,title:"Step 5a: Create spending transaction",slug:"step-5a-create-spending-transaction"},{level:3,title:"Step 6a: Sign and finalize PSBTs",slug:"step-6a-sign-and-finalize-psbts"},{level:3,title:"Step 7a: Broadcast finalized PSBT",slug:"step-7a-broadcast-finalized-psbt"},{level:3,title:"Step 8a: Confirm transaction included in a testnet block",slug:"step-8a-confirm-transaction-included-in-a-testnet-block"},{level:2,title:"Policy B. 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Road to BDK 1.0",description:"Outlining the plan for the 1.0 release of BDK",authors:["Alekos Filini"],date:"2022-10-03",tags:["architecture"],draft:!1,meta:[{property:"article:published_time",content:"2022-10-03T00:00:00.000Z"},{property:"og:site_name",content:"Bitcoin Dev Kit Documentation"},{property:"og:title",content:"The Road to BDK 1.0"},{property:"og:description",content:"Outlining the plan for the 1.0 release of BDK"},{property:"og:type",content:"article"},{property:"og:url",content:"https://bitcoindevkit.org/_blog/road_to_bdk_1/"},{property:"og:image",content:"https://bitcoindevkit.org/card.png"},{name:"twitter:title",content:"The Road to BDK 1.0"},{name:"twitter:description",content:"Outlining the plan for the 1.0 release of BDK"},{name:"twitter:url",content:"https://bitcoindevkit.org/_blog/road_to_bdk_1/"},{name:"twitter:card",content:"summary"},{name:"twitter:image",content:"https://bitcoindevkit.org/card.png"},{name:"twitter:label2",content:"Filed 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transactions."},{name:"twitter:url",content:"https://bitcoindevkit.org/bdk-cli/"},{name:"twitter:card",content:"summary"},{name:"twitter:image",content:"https://bitcoindevkit.org/card.png"},{name:"twitter:label2",content:"Filed under"},{name:"twitter:data2",content:"Bitcoin, Bitcoin Dev Kit, BDK"},{property:"article:tag",content:"Bitcoin"},{property:"article:tag",content:"Bitcoin Dev Kit"},{property:"article:tag",content:"BDK"}]},regularPath:"/bdk-cli/",relativePath:"bdk-cli/README.md",key:"v-009133c8",path:"/bdk-cli/",codeSwitcherOptions:{},lastUpdated:"4/20/2024, 8:03:01 AM",lastUpdatedTimestamp:1713600181e3},{title:"Using BDK with hardware wallets",frontmatter:{title:"Using BDK with hardware wallets",description:"Tutorial showing how to send funds to a HW and then spend from it using BDK",authors:["Daniela Brozzoni"],date:"2022-10-27",tags:["BDK","Development","Hardware 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AM",lastUpdatedTimestamp:1713600181e3},{title:"Compiler",frontmatter:{meta:[{property:"og:site_name",content:"Bitcoin Dev Kit Documentation"},{property:"og:title",content:"Compiler"},{property:"og:description",content:'If you want to play around with more complicated spending policies, you\'ll start to find it harder and harder to manually create the descriptors. This is where the miniscript compiler comes in! The `bdk` library\nincludes a very simple compiler that can produce a descriptor given a spending policy. The syntax used to encode the spending policy is very well described in this pagehttp://bitcoin.sipa.be/miniscript/,\nspecifically in the "Policy to Miniscript compiler". The compiler included in BDK does basically the same job, but produces descriptors for `rust-miniscript` that have some minor differences from\nthe ones made by the C++ implementation used in that website.'},{property:"og:type",content:"article"},{property:"og:url",content:"https://bitcoindevkit.org/bdk-cli/compiler/"},{property:"og:image",content:"https://bitcoindevkit.org/card.png"},{name:"twitter:title",content:"Compiler"},{name:"twitter:description",content:'If you want to play around with more complicated spending policies, you\'ll start to find it harder and harder to manually create the descriptors. This is where the miniscript compiler comes in! The `bdk` library\nincludes a very simple compiler that can produce a descriptor given a spending policy. The syntax used to encode the spending policy is very well described in this pagehttp://bitcoin.sipa.be/miniscript/,\nspecifically in the "Policy to Miniscript compiler". The compiler included in BDK does basically the same job, but produces descriptors for `rust-miniscript` that have some minor differences from\nthe ones made by the C++ implementation used in that website.'},{name:"twitter:url",content:"https://bitcoindevkit.org/bdk-cli/compiler/"},{name:"twitter:card",content:"summary"},{name:"twitter:image",content:"https://bitcoindevkit.org/card.png"},{name:"twitter:label2",content:"Filed under"},{name:"twitter:data2",content:"Bitcoin, Bitcoin Dev Kit, BDK"},{property:"article:tag",content:"Bitcoin"},{property:"article:tag",content:"Bitcoin Dev Kit"},{property:"article:tag",content:"BDK"}]},regularPath:"/bdk-cli/compiler.html",relativePath:"bdk-cli/compiler.md",key:"v-7a315e41",path:"/bdk-cli/compiler/",headers:[{level:2,title:"Introduction",slug:"introduction"},{level:2,title:"Installation",slug:"installation"},{level:2,title:"Usage",slug:"usage"},{level:2,title:"Example",slug:"example"},{level:2,title:"Troubleshooting",slug:"troubleshooting"}],codeSwitcherOptions:{},lastUpdated:"4/20/2024, 8:03:01 AM",lastUpdatedTimestamp:1713600181e3},{title:"Concept",frontmatter:{meta:[{property:"og:site_name",content:"Bitcoin Dev Kit Documentation"},{property:"og:title",content:"Concept"},{property:"og:description",content:"Now, in order to better grasp some of the design choices made by BDK, it's important to understand the main concept driving the development of this project, and the goal that it's trying to\nachieve."},{property:"og:type",content:"article"},{property:"og:url",content:"https://bitcoindevkit.org/bdk-cli/concept/"},{property:"og:image",content:"https://bitcoindevkit.org/card.png"},{name:"twitter:title",content:"Concept"},{name:"twitter:description",content:"Now, in order to better grasp some of the design choices made by BDK, it's important to understand the main concept driving the development of this project, and the goal that it's trying to\nachieve."},{name:"twitter:url",content:"https://bitcoindevkit.org/bdk-cli/concept/"},{name:"twitter:card",content:"summary"},{name:"twitter:image",content:"https://bitcoindevkit.org/card.png"},{name:"twitter:label2",content:"Filed under"},{name:"twitter:data2",content:"Bitcoin, Bitcoin Dev Kit, BDK"},{property:"article:tag",content:"Bitcoin"},{property:"article:tag",content:"Bitcoin Dev Kit"},{property:"article:tag",content:"BDK"}]},regularPath:"/bdk-cli/concept.html",relativePath:"bdk-cli/concept.md",key:"v-f611a14e",path:"/bdk-cli/concept/",codeSwitcherOptions:{},lastUpdated:"4/20/2024, 8:03:01 AM",lastUpdatedTimestamp:1713600181e3},{title:"Installation",frontmatter:{meta:[{property:"og:site_name",content:"Bitcoin Dev Kit Documentation"},{property:"og:title",content:"Installation"},{property:"og:description",content:"The only requirement to run the `bdk-cli` tool is a Linux/macOS system with a fairly recent Rust\ntoolchain installed. Since Linux distros tend to lag behind with updates, the quickest way to\ninstall the Rust compiler and Cargo is rustup.rshttps://rustup.rs/. You can head there and\nfollow their instructions, after which you can test if everything went fine by running"},{property:"og:type",content:"article"},{property:"og:url",content:"https://bitcoindevkit.org/bdk-cli/installation/"},{property:"og:image",content:"https://bitcoindevkit.org/card.png"},{name:"twitter:title",content:"Installation"},{name:"twitter:description",content:"The only requirement to run the `bdk-cli` tool is a Linux/macOS system with a fairly recent Rust\ntoolchain installed. Since Linux distros tend to lag behind with updates, the quickest way to\ninstall the Rust compiler and Cargo is rustup.rshttps://rustup.rs/. You can head there and\nfollow their instructions, after which you can test if everything went fine by running"},{name:"twitter:url",content:"https://bitcoindevkit.org/bdk-cli/installation/"},{name:"twitter:card",content:"summary"},{name:"twitter:image",content:"https://bitcoindevkit.org/card.png"},{name:"twitter:label2",content:"Filed under"},{name:"twitter:data2",content:"Bitcoin, Bitcoin Dev Kit, BDK"},{property:"article:tag",content:"Bitcoin"},{property:"article:tag",content:"Bitcoin Dev Kit"},{property:"article:tag",content:"BDK"}]},regularPath:"/bdk-cli/installation.html",relativePath:"bdk-cli/installation.md",key:"v-3acb6e6a",path:"/bdk-cli/installation/",headers:[{level:2,title:"Requirements",slug:"requirements"},{level:2,title:"Installing the bdk-cli tool",slug:"installing-the-bdk-cli-tool"}],codeSwitcherOptions:{},lastUpdated:"4/20/2024, 8:03:01 AM",lastUpdatedTimestamp:1713600181e3},{title:"Interface",frontmatter:{meta:[{property:"og:site_name",content:"Bitcoin Dev Kit Documentation"},{property:"og:title",content:"Interface"},{property:"og:description",content:"Remember the `bdk-cli --help` command you ran before? Let's analyze its output here to figure out the interface:"},{property:"og:type",content:"article"},{property:"og:url",content:"https://bitcoindevkit.org/bdk-cli/interface/"},{property:"og:image",content:"https://bitcoindevkit.org/card.png"},{name:"twitter:title",content:"Interface"},{name:"twitter:description",content:"Remember the `bdk-cli --help` command you ran before? 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Vn(Object.assign(r,{router:n,render:t=>t("div",{attrs:{id:"app"}},[t("RouterView",{ref:"layout"}),t("div",{class:"global-ui"},ul.map(e=>t(e)))])})),router:n}}(!1).then(({app:t,router:e})=>{e.onReady(()=>{t.$mount("#app")})})}]); \ No newline at end of file diff --git a/bdk-cli/compiler/index.html b/bdk-cli/compiler/index.html index 6b3b5e084a..0d7cf35c15 100644 --- a/bdk-cli/compiler/index.html +++ b/bdk-cli/compiler/index.html @@ -35,7 +35,7 @@ - + @@ -155,7 +155,7 @@ } }

# Troubleshooting

# Nothing is printed

This might mean that you have a RUST_LOG variable set to a value that suppresses the compiler's log. You can try adding miniscriptc=info to your RUST_LOG value and see if that works, or open a new clean -shell.

+shell.

←

Copyright © 2024 BDK Developers

- + diff --git a/bdk-cli/concept/index.html b/bdk-cli/concept/index.html index de75ac74e2..2778b05df9 100644 --- a/bdk-cli/concept/index.html +++ b/bdk-cli/concept/index.html @@ -31,7 +31,7 @@ - + @@ -62,7 +62,7 @@ will never contain any data that can't be recreated purely by looking at the blockchain. 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 6fb8d5738b..eeefba5121 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 d54d24faf8..ced1700d80 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 1a5089b6b4..70609afa5b 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 32b168a5f4..a8448d4c21 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 09532e177f..10dff36410 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

    ←

    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/bdk-cli/regtest/index.html b/bdk-cli/regtest/index.html index 860f2a1160..e62e3df1fd 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 9afed33541..30fb0eaf99 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!

    - + diff --git a/blog/2020/12/release-v0.2.0/index.html b/blog/2020/12/release-v0.2.0/index.html index 872f2a18bc..c20fa2d3a4 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 94b483af26..b0f33cade5 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 ffef2471bf..74670eb183 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 7bbf15d809..b29e5175d2 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 94b6ebde7a..b047512b27 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 6ea24c86a5..5b08eb0e0a 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 1bcdd5549b..3026e97b8f 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 65c6882d8d..6809fb8bfd 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 3e9f4cb23e..17dcd8375f 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 2dc5e5b285..96730f48ff 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 157ddda392..2bd93ce336 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 0ad9e0a993..458d924451 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 c199a2d717..2311521f3d 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 c2a95583fd..001e64cef0 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 f7a92e0370..12f3c3e2b6 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 9be6a8d0f1..9e999137c5 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 9625845d53..312e73fd17 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 59bed3227b..3a065edc72 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 6eb42ff7c5..abdea21884 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 786c35e637..2fb271b0b4 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 79db24720f..db1036f080 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 24b6f0b9eb..f85988f98a 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 71c60fd408..b62eafef0f 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 58cfa477be..0b464352dc 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 ca7fd7c185..cc16c70f3b 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 6ade111b59..667dcdad4a 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 3995448d92..8bd571216a 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 64205d4e33..55ae3e4d3c 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 126cb8348a..608ee977f3 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 17517cfb77..9eb7d1cedc 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 d4a82ac390..dee5e12018 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 ca6ff94c82..d5f6b5a577 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 0b1fa29fb3..1cb6e4b3a2 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 bf2c85de77..afa8e11287 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 d3629caa71..b520e1405d 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_hwi/index.html b/docs-rs/bdk/nightly/latest/bdk_hwi/index.html index 7d31c80e5c..67df392037 100644 --- a/docs-rs/bdk/nightly/latest/bdk_hwi/index.html +++ b/docs-rs/bdk/nightly/latest/bdk_hwi/index.html @@ -1,5 +1,5 @@ bdk_hwi - Rust

    Crate bdk_hwi

    source ·
    Expand description

    HWI Signer

    -

    This crate contains HWISigner, an implementation of a TransactionSigner to be +

    This crate contains HWISigner, an implementation of a TransactionSigner to be used with hardware wallets.

    let mut devices = HWIClient::enumerate()?;
diff --git a/docs-rs/bdk/nightly/latest/bdk_hwi/struct.HWISigner.html b/docs-rs/bdk/nightly/latest/bdk_hwi/struct.HWISigner.html
index fb33bf59db..b18d2baff8 100644
--- a/docs-rs/bdk/nightly/latest/bdk_hwi/struct.HWISigner.html
+++ b/docs-rs/bdk/nightly/latest/bdk_hwi/struct.HWISigner.html
@@ -1,7 +1,7 @@
 HWISigner in bdk_hwi - Rust
    Struct bdk_hwi::HWISigner
    source · 
    pub struct HWISigner { /* private fields */ }
    Expand description
    Custom signer for Hardware Wallets
    
 
    This ignores sign_options and leaves the decisions up to the hardware wallet.
    
 
    Implementations§
    Create a instance from the specified device and chain
    
-
    Trait Implementations§
    Formats the value using the given formatter. Read more
    Return the SignerId for this signer Read more
    Return the secret key for the signer Read more
    Sign all the inputs of the psbt
    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
    Return the [SignerId] for this signer Read more
    Return the secret key for the signer Read more
    Sign all the inputs of the psbt
    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..cacf4366b1 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_electrum/type.ChangeSet.html b/docs-rs/bdk/nightly/latest/example_electrum/type.ChangeSet.html
index e65eaa0923..b17942f23e 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..a98214f7c6 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 93fcd70225..29b9c64e1f 100644
--- a/docs-rs/bdk/nightly/latest/help.html
+++ b/docs-rs/bdk/nightly/latest/help.html
@@ -1 +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/wallet/signer/trait.SignerCommon.js b/docs-rs/bdk/nightly/latest/implementors/bdk/wallet/signer/trait.SignerCommon.js
index b008aa7a79..fb042c4512 100644
--- a/docs-rs/bdk/nightly/latest/implementors/bdk/wallet/signer/trait.SignerCommon.js
+++ b/docs-rs/bdk/nightly/latest/implementors/bdk/wallet/signer/trait.SignerCommon.js
@@ -1,4 +1,4 @@
 (function() {var implementors = {
 "bdk":[],
-"bdk_hwi":[["impl SignerCommon for HWISigner"]]
+"bdk_hwi":[["impl SignerCommon for HWISigner"]]
 };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/wallet/signer/trait.TransactionSigner.js b/docs-rs/bdk/nightly/latest/implementors/bdk/wallet/signer/trait.TransactionSigner.js
index ea6c96cd81..68919d45f8 100644
--- a/docs-rs/bdk/nightly/latest/implementors/bdk/wallet/signer/trait.TransactionSigner.js
+++ b/docs-rs/bdk/nightly/latest/implementors/bdk/wallet/signer/trait.TransactionSigner.js
@@ -1,4 +1,4 @@
 (function() {var implementors = {
 "bdk":[],
-"bdk_hwi":[["impl TransactionSigner for HWISigner"]]
+"bdk_hwi":[["impl TransactionSigner for HWISigner"]]
 };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/settings.html b/docs-rs/bdk/nightly/latest/settings.html
index aaac72d2fe..1b4fa78213 100644
--- a/docs-rs/bdk/nightly/latest/settings.html
+++ b/docs-rs/bdk/nightly/latest/settings.html
@@ -1 +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/examples/index.html b/examples/index.html
index c742a066d7..f3d66c7b61 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 83c993e733..86410b15ae 100644 --- a/foundation/index.html +++ b/foundation/index.html @@ -29,7 +29,7 @@ - + @@ -74,6 +74,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/getting-started/index.html b/getting-started/index.html index a0488b85c9..48f4550ec0 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 @@

    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/index.html b/index.html index 1d64d8cc34..15aa2c0b9e 100644 --- a/index.html +++ b/index.html @@ -29,7 +29,7 @@ - + @@ -80,6 +80,6 @@
    BDK Foundation

    Copyright © 2024 BDK Developers

    - + diff --git a/sitemap.xml b/sitemap.xml index 68270d8298..b6e892880e 100644 --- a/sitemap.xml +++ b/sitemap.xml @@ -1 +1 @@ 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