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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<meta property="og:title" content="OpenTimestamps: a timestamping proof standard">
<meta property="og:description" content="OpenTimestamps aims to be a standard format for blockchain timestamping. The format is flexible enough to be vendor and blockchain independent.">
<meta property="og:type" content="website">
<meta property="og:url" content="https://opentimestamps.org/">
<meta property="og:image" content="./assets/images/og.jpg">
<title>OpenTimestamps</title>
<link rel="stylesheet" href="./assets/stylesheets/application.css" media="screen" title="no title">
</head>
<body>
<header class="header">
<div class="container">
<a href="#" class="header-logo"></a>
<div class="header-nav-open"></div>
<nav class="header-nav">
<!-- <a href="#intro" class="header-nav-i">Intro</a> -->
<a href="#stamp-and-verify" class="header-nav-i">Stamp and Verify</a>
<a href="#how-it-works" class="header-nav-i">How it works</a>
<a href="#members" class="header-nav-i">Members</a>
<a href="#code-repositories" class="header-nav-i">Code repositories</a>
<!-- <a href="#use-cases" class="header-nav-i">Use cases</a> -->
<a href="https://lists.opentimestamps.org" class="header-nav-i">Mailing lists</a>
</nav>
</div>
</header>
<!-- INTRO -->
<section class="intro" id="intro">
<div class="container">
<h1 class="intro-title">A timestamping proof standard</h1>
<h2 class="intro-description">
OpenTimestamps aims to be a standard format
for blockchain timestamping. The format is flexible
enough to be vendor and blockchain independent.
</h2>
</div>
</section>
<!-- NAVIGATION -->
<section class="navigation">
<div class="container">
<a href="#stamp-and-verify" class="navigation-i">
<span class="navigation-icon navigation-icon_stamp-and-verify"></span>
<p class="navigation-title">Stamp & Verify</p>
<p class="navigation-description">
Use the in-browser
stamper and verifier
</p>
</a>
<a href="#how-it-works" class="navigation-i">
<span class="navigation-icon navigation-icon_how-it-works"></span>
<p class="navigation-title">How it works?</p>
<p class="navigation-description">
Details on
OpenTimestamps
</p>
</a>
<a href="#members" class="navigation-i">
<span class="navigation-icon navigation-icon_members"></span>
<p class="navigation-title">Members</p>
<p class="navigation-description">
Companies using
OpenTimestamps
</p>
</a>
<a href="#code-repositories" class="navigation-i">
<span class="navigation-icon navigation-icon_repositories"></span>
<p class="navigation-title">Code repositories</p>
<p class="navigation-description">
OpenTimestamps
repositories
</p>
</a>
<a href="https://lists.opentimestamps.org" class="navigation-i">
<span class="navigation-icon navigation-icon_mailing-list"></span>
<p class="navigation-title">Mailing lists</p>
<p class="navigation-description">
OpenTimestamps
announcements
</p>
</a>
<a href="/internet-archive" class="navigation-i">
<span class="navigation-icon navigation-icon_internet-archive"></span>
<p class="navigation-title">Internet Archive</p>
<p class="navigation-description">
OpenTimestamps proof for the Internet Archive
</p>
</a>
<!--<a href="#use-cases" class="navigation-i">
<span class="navigation-icon navigation-icon_use-cases"></span>
<p class="navigation-title">Use cases</p>
<p class="navigation-description">
What can you do with
timestamping?
</p>
</a>-->
</div>
</section>
<!-- STAMP AND VERIFY -->
<section class="stamp-and-verify" id="stamp-and-verify">
<div class="container">
<div class="stamp-and-verify-stamp" id="stamp">
<p class="stamp-and-verify-block-title">Stamp</p>
<p class="stamp-and-verify-title">Data to timestamp</p>
<p class="stamp-and-verify-description">
</p>
<div class="stamp-and-verify-drop-zone" id="document_holder">
Drop here a document<br>
Or click to select one
</div>
<input id="document_input" type="file" style="display:none">
<div class="stamp-and-verify-result result result_stamp">
<p class="result-title">
<span id="document_filename">Max file size is 100MB</span>
<span id="document_filesize"></span>
</p>
<p class="result-description" id="document_hash">
The hash is calculated on your browser preserving your privacy. <a href="https://github.com/opentimestamps/opentimestamps.org/pull/7">More</a>.
Timestamping proof download will start automatically after pressing the button
</div>
<div class="statuses-container">
<div class="statuses statuses_hashing" style="display: none">
<p class="statuses-title">52%</p>
<p class="statuses-description">
Hashing
</p>
</div>
<div class="statuses statuses_success" style="display: none">
<p class="statuses-title">Success!</p>
<p class="statuses-description">
OpenTimestamps receipt created and download started
</p>
</div>
<div class="statuses statuses_failure" style="display: none">
<p class="statuses-title">Failure!</p>
<p class="statuses-description">
To stamp you need to drop a file in the Data field
</p>
</div>
</div>
<button type="button" class="stamp-and-verify-button" id="stampButton">Stamp</button>
</div>
<div class="stamp-and-verify-verify" id="verify">
<p class="stamp-and-verify-block-title">Verify</p>
<p class="stamp-and-verify-title">Timestamped data</p>
<p class="stamp-and-verify-description">
</p>
<div class="stamp-and-verify-drop-zone" id="proof_holder">
Drop here <i>.ots</i> receipt<br>
Or click to select one
</div>
<input id="proof_input" type="file" style="display:none">
<div class="stamp-and-verify-result result result_verify">
<p class="result-title">
<span id="proof_filename"></span>
<span id="proof_filesize"></span>
</p>
<p class="result-description">In-browser verification is to be considered for testing purpose only.<br>For proven security system use <a href="https://github.com/opentimestamps/opentimestamps-client">OpenTimestamps client</a></p>
</p>
</div>
<div class="statuses-container">
<div class="statuses statuses_hashing" style="display: none">
<p class="statuses-title">52%</p>
<p class="statuses-description">
Hashing
</p>
</div>
<div class="statuses statuses_success" style="display: none">
<p class="statuses-title">Success!</p>
<p class="statuses-description">
OpenTimestamps receipt created and download started
</p>
</div>
<div class="statuses statuses_failure" style="display: none">
<p class="statuses-title">Failure!</p>
<p class="statuses-description">
To stamp you need to drop a file in the Data field
</p>
</div>
<div class="statuses statuses_warning" style="display: none">
<p class="statuses-title">Pending</p>
<p class="statuses-description">
</p>
</div>
</div>
<button type="button" class="stamp-and-verify-button" id="infoButton">Info</button>
<button type="button" class="stamp-and-verify-button" id="verifyButton">Verify</button>
</div>
</div>
<br>
<div class="alert alert-warning" role="alert" id="status" style="display:none">
</div>
<div id="loading" style="display:none">
<i class="fa fa-cog fa-spin fa-3x fa-fw"></i>
<span class="sr-only">Loading...</span>
</div>
<div class="alert alert-warning" role="alert" id="alertMessage" style="display:none">
</div>
<div class="alert alert-success" role="alert" id="successMessage" style="display:none">
</div>
<div class="alert alert-danger" role="alert" id="dangerMessage" style="display:none">
</div>
<div class="alert alert-warning" role="alert" id="warningMessage" style="display:none">
</div>
</section>
<!-- HOW IT WORKS -->
<section class="how-it-works" id="how-it-works">
<div class="container">
<h3 class="how-it-works-title">How it Works?</h3>
<p class="how-it-works-description">
A timestamp proves that some data existed prior to some point in time. OpenTimestamps defines a set of operations for creating provable timestamps and later independently verifying them.
At the time of writing timestamping on the Bitcoin blockchain is supported, the format is flexible enough to support a variety of methods. <a href="https://petertodd.org/2016/opentimestamps-announcement">More.</a>
</p>
<br>
<p class="how-it-works-description">
Anyone could realize a timestamp with the permissionless blockchain by paying the transaction fees, for your convenience we offer calendar servers that perform this operation for you. These servers are <strong>free to use</strong> and they don't require any registration or api key.
</p>
</div>
<div class="how-it-works-example">
<div class="example-tabs">
<p class="example-tabs-i active" data-tab="python">Python</p>
<p class="example-tabs-i" data-tab="javascript">Javascript</p>
<p class="example-tabs-i" data-tab="java">Java</p>
</div>
<div class="example-content example-content_python active">
<pre>
$ pip3 install opentimestamps-client
$ ots stamp my-file
</pre>
<a href="https://github.com/opentimestamps/opentimestamps-client/blob/master/README.md" class="example-content-more">More</a>
</div>
<div class="example-content example-content_javascript">
<pre>
$ npm install -g javascript-opentimestamps
$ ots-cli.js stamp my-file
</pre>
<a href="https://github.com/opentimestamps/javascript-opentimestamps/blob/master/README.md" class="example-content-more">More</a>
</div>
<div class="example-content example-content_java">
<pre>
$ git clone https://github.com/opentimestamps/java-opentimestamps
$ cd java-opentimestamps
$ mvn install
$ java -jar target/OtsCli.jar stamp my-file
</pre>
<a href="https://github.com/opentimestamps/java-opentimestamps/blob/master/README.md" class="example-content-more">More</a>
</div>
</div>
</section>
<!-- MEMBERS -->
<section class="members" id="members">
<h3 class="members-block-title">Members</h3>
<div class="container">
<div class="members-i">
<a href="http://eternitywall.com" class="members-link">
<img src="./assets/images/logos/eternity-wall.png" alt="eternity wall" width="100">
<span class="members-name">Eternity wall</span>
</a>
</div>
<div class="members-i">
<a href="https://stampery.com/" class="members-link">
<img src="./assets/images/logos/stampery.png" alt="stampery" width="200">
<span class="members-name">Stampery</span>
</a>
</div>
<div class="members-i">
<a href="https://www.blocknotary.com/" class="members-link">
<img src="./assets/images/logos/[email protected]" alt="" width="160">
<span class="members-name">Block Notary</span>
</a>
</div>
<div class="members-i">
<a href="https://www.verisart.com/" class="members-link">
<img src="./assets/images/logos/[email protected]" alt="" width="160">
<span class="members-name">Verisart</span>
</a>
</div>
<div class="members-i">
<a href="https://signatura.co" class="members-link">
<img src="./assets/images/logos/[email protected]" alt="" width="190px">
<span class="members-name">Signatura</span>
</a>
</div>
<div class="members-i">
<a href="http://www.osdsp.com" class="members-link">
<img src="./assets/images/logos/[email protected]" alt="" width="120px" style="padding-top:10px;">
<span class="members-name">OSDSP</span>
</a>
</div>
<div class="members-i">
<a href="http://chain.ventures" class="members-link">
<img src="./assets/images/logos/chain_ventures.png" alt="" width="140px" style="padding-top:10px;">
<span class="members-name">Chain ventures</span>
</a>
</div>
<div class="members-i">
<a href="https://github.com/opentimestamps/opentimestamps.org/issues/2" class="members-link members-link_add">
<img src="./assets/images/logos/company.png" alt="" width="100">
<span class="members-name">Add your company here</span>
</a>
</div>
</div>
</section>
<!-- REPOSITORIES -->
<section class="repositories" id="code-repositories">
<h3 class="repositories-block-title">Repositories</h3>
<div class="container">
<a href="https://github.com/opentimestamps/opentimestamps-client" class="repositories-i">
<div class="repositories-icon repositories-icon_client"></div>
<p class="repositories-title">Client</p>
<p class="repositories-description">
Client tool to perform stamping of files through a
calendar server and to verify OpenTimestamps proof
</p>
<span class="repositories-name">
opentimestamps-client
</span>
</a>
<a href="https://github.com/opentimestamps/opentimestamps-server" class="repositories-i">
<div class="repositories-icon repositories-icon_server"></div>
<p class="repositories-title">Server</p>
<p class="repositories-description">
Calendar Server receiving timestamp request from
clients
</p>
<span class="repositories-name">
opentimestamps-server
</span>
</a>
<a href="https://github.com/opentimestamps/python-opentimestamps" class="repositories-i">
<div class="repositories-icon repositories-icon_python"></div>
<p class="repositories-title">Python</p>
<p class="repositories-description">
Common library
</p>
<span class="repositories-name">
python-opentimestamps
</span>
</a>
<a href="https://github.com/opentimestamps/javascript-opentimestamps" class="repositories-i">
<div class="repositories-icon repositories-icon_javascript"></div>
<p class="repositories-title">Javascript</p>
<p class="repositories-description">
Common library & Client tool
</p>
<span class="repositories-name">
javascript-opentimestamps
</span>
</a>
<a href="https://github.com/opentimestamps/java-opentimestamps" class="repositories-i">
<div class="repositories-icon repositories-icon_java"></div>
<p class="repositories-title">Java</p>
<p class="repositories-description">
Common library & Client tool
</p>
<span class="repositories-name">
java-opentimestamps
</span>
</a>
<a href="https://github.com/opentimestamps/rust-opentimestamps" class="repositories-i">
<div class="repositories-icon repositories-icon_rust"></div>
<p class="repositories-title">Rust</p>
<p class="repositories-description">
Rust library
</p>
<span class="repositories-name">
rust-opentimestamps
</span>
</a>
</div>
</section>
<!-- USE CASES -->
<!--
<section class="use-cases" id="use-cases">
<div class="container">
<h3 class="use-cases-title">Use cases</h3>
<p class="use-cases-description">
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut
labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco
laboris nisi ut aliquip ex ea commodo consequat.
<br><br>
<a href="#">Opentimestamps for git</a>
</p>
</div>
</section>
-->
<footer class="footer">
<div class="container">
<a href="#" class="footer-logo"></a>
<a href="https://twitter.com/opentimestamps" class="footer-contact-us">@opentimestamps</a>
</div>
</footer>
<script src="./assets/javascripts/application.js"></script>
<script src="./assets/javascripts/index.js"></script>
</body>
</html>