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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.">
<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">
<link rel="stylesheet" href="/assets/stylesheets/timestamp-of.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.
</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>
<h2 class="navigation-title">Stamp & Verify</h2>
<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="" id="stamp">
<h2 class="stamp-and-verify-block-title" style="text-align: center;">Stamp & Verify</h2>
<p class="stamp-and-verify-description">
</p>
<div class="stamp-and-verify-drop-zone" id="document_holder">
<span class="filename"></span>
<span class="filesize"></span>
<p class="hash">
Drop here a file to <b>stamp</b><br>
OR<br>
an <i>.ots</i> proof file to <b>verify</b>
</p>
</div>
<input id="document_input" type="file" style="display:none">
<br>
<div class="stamp-and-verify-drop-zone" id="stamped_holder" style="display:none">
<span class="filename"></span>
<span class="filesize"></span>
<p class="hash">
<br>Drop here the stamped file
</p>
</div>
<input id="stamped_input" type="file" style="display:none">
<div class="stamp-and-verify-result result result_stamp" id="result_stamp">
<p class="result-description">
The hash is calculated on your browser preserving your privacy. <a
href="https://github.com/opentimestamps/opentimestamps.org/pull/7">More</a>...<br>
Timestamping proof download will start automatically after uploading document.
</p>
</div>
</div>
<div class="statuses-container">
<div class="statuses statuses_hashing" id="statuses" style="display: none">
<a href="#" class="statuses-info" style="display: none"></a>
<p class="statuses-title">52%</p>
<p class="statuses-description">
Hashing
</p>
</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>-->
</div>
</section>
<!-- TIMESTAMP INFO -->
<section class="intro" id="info" style="display:none">
<h2 class="timestamp-of">
Timestamp of
<span id="title_digest"></span>
</h2>
<p class="document-digest">Document digest (<span id="type"></span>):</p>
<p class="sha" id="digest"></p>
</section>
<div class="types" id="legend" style="display:none">
<div class="container">
<div class="types-i green">Bitcoin Attestation</div>
<div class="types-i grey">Unknown Attestation</div>
<div class="types-i gold">Pending/Other Attestation</div>
<div class="types-i purple">Comments</div>
<div class="types-i blue">Fork</div>
</div>
</div>
<div class="container">
<div class="table" id="table">
</div>
</div>
<div class="clipboard-copy" style="display: none">
<div class="badge-copy">
Copied to Clipboard: <span class="hash"></span>
</div>
</div>
<!-- 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 <a href="#calendars">calendar servers</a> 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>
<!-- CALENDARS -->
<section class="repositories" id="calendars">
<h3 class="repositories-block-title">Calendars</h3>
<div class="container">
<div class="repositories-description">The following are the, <strong>free to use</strong>, default calendars used
by OpenTimestamps. They rely on donations to reduce maintainers efforts, they accept bitcoin and some accept
lightning network payments. Check the calendars <a href="http://uptime.opentimestamps.net/">uptime</a>.</div>
<div class="repositories-description"> </div>
<a href="https://alice.btc.calendar.opentimestamps.org/">
<p class="repositories-title">Alice</p>
</a>
<a href="https://bob.btc.calendar.opentimestamps.org/">
<p class="repositories-title">Bob</p>
</a>
<a href="https://finney.calendar.eternitywall.com/">
<p class="repositories-title">Finney</p>
</a>
<a href="https://ots.btc.catallaxy.com/">
<p class="repositories-title">Catallaxy</p>
</a>
</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" height="52">
<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" height="46">
<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" height="37">
<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" height="37">
<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="190" height="29">
<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="120" height="75" 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="140" style="padding-top:10px;">
<span class="members-name">Chain ventures</span>
</a>
</div>
-->
<!--
<div class="members-i">
<a href="https://www.producerdesk.com/" class="members-link">
<img src="./assets/images/logos/producerdesk.png" alt="" width="140" style="padding-top:10px;">
<span class="members-name">producerDesk</span>
</a>
</div>
-->
<div class="members-i">
<a href="https://catallaxy.com/" class="members-link">
<img src="./assets/images/logos/catallaxy.png" alt="" width="140" height="32" style="padding-top:10px;">
<span class="members-name">catallaxy</span>
</a>
</div>
<div class="members-i">
<a href="https://bylls.com/" class="members-link">
<img src="./assets/images/logos/bylls.png" alt="" width="140" height="71" style="padding-top:10px;">
<span class="members-name">Bylls</span>
</a>
</div>
<div class="members-i">
<a href="https://www.xcoobee.com/" class="members-link">
<img src="./assets/images/logos/XcooBee.png" alt="" width="140" height="42" style="padding-top:10px;">
<span class="members-name">XcooBee</span>
</a>
</div>
<div class="members-i">
<a href="https://condominioadvisor.it/" class="members-link">
<img src="./assets/images/logos/condominio_advisor.png" alt="" width="160" height="74"
style="padding-top:10px;">
<span class="members-name">CondominioAdvisor</span>
</a>
</div>
<div class="members-i">
<a href="https://www.cerved.com/" class="members-link">
<img src="./assets/images/logos/logo_cerved_color.png" alt="" width="160" height="55"
style="padding-top:10px;">
<span class="members-name">Cerved</span>
</a>
</div>
<div class="members-i">
<a href="https://www.tramitapp.com/" class="members-link">
<img src="./assets/images/logos/tramitapp.png" alt="" width="80" height="90" style="padding-top:10px;">
<span class="members-name">TramitApp</span>
</a>
</div>
<div class="members-i">
<a href="http://www.ayi-asociados.com/" class="members-link">
<img src="./assets/images/logos/ayi_asociados.png" alt="" width="180" height="49" style="padding-top:10px;">
<span class="members-name">Ayi & asociados</span>
</a>
</div>
<div class="members-i">
<a href="http://www.tutelio.org/" class="members-link">
<img src="./assets/images/logos/tutelio.png" alt="" width="160" height="45" style="padding-top:10px;">
<span class="members-name">Tutelio</span>
</a>
</div>
<div class="members-i">
<a href="http://www.idshooter.com/" class="members-link">
<img src="./assets/images/logos/idshooter.png" alt="" width="160" height="38" style="padding-top:10px;">
<span class="members-name">Id shooter</span>
</a>
</div>
<div class="members-i">
<a href="https://creativitysafe.com/" class="members-link">
<img src="./assets/images/logos/creativity_safe.png" alt="" width="75" height="102" style="padding-top:10px;">
<span class="members-name">Creativity Safe</span>
</a>
</div>
<!--
<div class="members-i">
<a href="https://fireblock.io/" class="members-link">
<img src="./assets/images/logos/fireblock.png" alt="" width="150" style="padding-top:10px;">
<span class="members-name">Fireblock</span>
</a>
</div>
-->
<!--
<div class="members-i">
<a href="https://datastamp.io/" class="members-link">
<img src="./assets/images/logos/datastamp.png" alt="" width="100" style="padding-top:10px;">
<span class="members-name">Datastamp</span>
</a>
</div>
-->
<div class="members-i">
<a href="https://jenia.it/" class="members-link">
<img src="./assets/images/logos/jenia.png" alt="" width="150" height="160" style="padding-top:10px;">
<span class="members-name">Jenia Software</span>
</a>
</div>
<div class="members-i">
<a href="https://certifirm.eu/" class="members-link">
<img src="./assets/images/logos/certifirm.png" alt="" width="130" height="54" style="padding-top:10px;">
<span class="members-name">Certifirm</span>
</a>
</div>
<div class="members-i">
<a href="https://dgi.io/" class="members-link">
<img src="./assets/images/logos/digitalgoldinstitute.svg" alt="" width="100" height="70"
style="padding-top:10px;">
<span class="members-name">DGI</span>
</a>
</div>
<div class="members-i">
<a href="https://www.intesigroup.com" class="members-link">
<img src="./assets/images/logos/intesigroup.png" alt="" width="95" height="105" style="padding-top:10px;">
<span class="members-name">Intesi Group</span>
</a>
</div>
<div class="members-i">
<a href="https://www.trusty.id/" class="members-link">
<img src="./assets/images/logos/trusty.png" alt="" width="145" height="41" style="padding-top:10px;">
<span class="members-name">Trusty</span>
</a>
</div>
<div class="members-i">
<a href="https://stampiz.io/" class="members-link">
<img src="./assets/images/logos/stampiz.png" alt="" width="100" height="107" style="padding-top:10px;">
<span class="members-name">Stampiz</span>
</a>
</div>
<div class="members-i">
<a href="https://www.edom-electric.com/fakeproof" class="members-link">
<img src="./assets/images/logos/fakeproof.png" alt="" width="90" height="90" style="padding-top:10px;">
<span class="members-name">Fakeproof</span>
</a>
</div>
<div class="members-i">
<a href="https://certika.co/" class="members-link">
<img src="./assets/images/logos/certika.jpeg" alt="" width="140" height="34" style="padding-top:10px;">
<span class="members-name">Certika</span>
</a>
</div>
<div class="members-i">
<a href="https://knowmadinstitut.org/" class="members-link">
<img src="./assets/images/logos/knowmadinstitut.png" alt="" width="100" height="100"
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<span class="members-name">Knowmad Institut</span>
</a>
</div>
<div class="members-i">
<a href="https://savis.vn" class="members-link">
<img src="./assets/images/logos/Logo-Savis-Digital.jpeg" alt="" width="200" height="85"
style="padding-top:10px;">
<span class="members-name">Savis Digital</span>
</a>
</div>
<div class="members-i">
<a href="https://www.simpleproof.com/" class="members-link">
<img src="./assets/images/logos/simpleproof.png" alt="Simpleproof" width="90" height="90"
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</a>
</div>
<div class="members-i">
<a href="https://digitaltimestamps.com/" class="members-link">
<img src="./assets/images/logos/digital-timestamps.png" alt="Digital Timestamps" width="267" height="38"
style="padding-top:10px;">
<span class="members-name">Digital Timestamps</span>
</a>
</div>
<div class="members-i">
<a href="https://github.com/opentimestamps/opentimestamps.org/issues/2" class="members-link members-link_add">
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<!-- REPOSITORIES -->
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<h3 class="repositories-block-title">Repositories</h3>
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<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
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<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 -->
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<a href="#">Opentimestamps for git</a>
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