Pibtproof
8 months ago in HTML
<!DOCTYPE html><html>
<!-- Mirrored from web.archive.org/web/20160114165710/https://www.btproof.com/ by HTTrack Website Copier/3.x [XR&CO'2014], Fri, 05 Apr 2019 23:15:35 GMT -->
<!-- Added by HTTrack --><meta http-equiv="content-type" content="text/html;charset=utf-8" /><!-- /Added by HTTrack -->
<head><script src="images/analytics2a5b.js" type="text/javascript"></script>
<script type="text/javascript">window.addEventListener('DOMContentLoaded',function(){var v=archive_analytics.values;v.service='wb';v.server_name='wwwb-app103.us.archive.org';v.server_ms=231;archive_analytics.send_pageview({});});</script><script type="text/javascript" src="images/ait-client-rewrite5887.js" charset="utf-8"></script>
<script type="text/javascript">
WB_wombat_Init("https://web.archive.org/web", "20160114165710", "www.btproof.com");
</script>
<script type="text/javascript" src="images/wbhack5887.js" charset="utf-8"></script>
<script type="text/javascript">
__wbhack.init('https://web.archive.org/web');
</script>
<link rel="stylesheet" type="text/css" href="images/banner-styles81d7.css" />
<link rel="stylesheet" type="text/css" href="images/iconochive81d7.css" />
<!-- End Wayback Rewrite JS Include -->
<title>BTProof -
Bitcoin Trusted Timestamping</title><meta charset="utf-8"><link rel="stylesheet" href="images/bootstrap.css"><link rel="stylesheet" href="images/style.css"></head><body><!-- BEGIN WAYBACK TOOLBAR INSERT -->
<script type="text/javascript" src="images/timestamp5887.js" charset="utf-8"></script>
<script type="text/javascript" src="images/graph-calc5887.js" charset="utf-8"></script>
<script type="text/javascript" src="images/auto-complete5887.js" charset="utf-8"></script>
<script type="text/javascript" src="images/toolbar5887.js" charset="utf-8"></script>
<style type="text/css">
body {
margin-top:0 !important;
padding-top:0 !important;
/*min-width:800px !important;*/
}
.wb-autocomplete-suggestions {
text-align: left; cursor: default; border: 1px solid #ccc; border-top: 0; background: #fff; box-shadow: -1px 1px 3px rgba(0,0,0,.1);
position: absolute; display: none; z-index: 2147483647; max-height: 254px; overflow: hidden; overflow-y: auto; box-sizing: border-box;
}
.wb-autocomplete-suggestion { position: relative; padding: 0 .6em; line-height: 23px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-size: 1.02em; color: #333; }
.wb-autocomplete-suggestion b { font-weight: bold; }
.wb-autocomplete-suggestion.selected { background: #f0f0f0; }
</style>
<div id="wm-ipp" lang="en" style="display:none;direction:ltr;">
<div style="position:fixed;left:0;top:0;right:0;">
<div id="wm-ipp-inside">
<div style="position:relative;">
<div id="wm-logo" style="float:left;width:130px;padding-top:10px;">
<a href="https://web.archive.org/web/" title="Wayback Machine home page"><img src="images/wayback-toolbar-logo.png" alt="Wayback Machine" width="110" height="39" border="0" /></a>
</div>
<div class="r" style="float:right;">
<div id="wm-btns" style="text-align:right;height:25px;">
<div id="wm-save-snapshot-success">success</div>
<div id="wm-save-snapshot-fail">fail</div>
<a href="#"
onclick="__wm.saveSnapshot('https://www.btproof.com/', '20160114165710')"
title="Share via My Web Archive"
id="wm-save-snapshot-open"
>
<span class="iconochive-web"></span>
</a>
<a href="https://archive.org/account/login.php"
title="Sign In"
id="wm-sign-in"
>
<span class="iconochive-person"></span>
</a>
<span id="wm-save-snapshot-in-progress" class="iconochive-web"></span>
<a href="http://faq.web.archive.org/" title="Get some help using the Wayback Machine" style="top:-6px;"><span class="iconochive-question" style="color:rgb(87,186,244);font-size:160%;"></span></a>
<a id="wm-tb-close" href="#close" onclick="__wm.h(event);return false;" style="top:-2px;" title="Close the toolbar"><span class="iconochive-remove-circle" style="color:#888888;font-size:240%;"></span></a>
</div>
<div id="wm-share" style="text-align:right;">
<a href="#" onclick="window.open('https://www.facebook.com/sharer/sharer.php?u=https://web.archive.org/web/20160114165710/https://www.btproof.com/', '', 'height=400,width=600'); return false;" title="Share on Facebook" style="margin-right:5px;" target="_blank"><span class="iconochive-facebook" style="color:#3b5998;font-size:160%;"></span></a>
<a href="#" onclick="window.open('https://twitter.com/intent/tweet?text=https://web.archive.org/web/20160114165710/https://www.btproof.com/&via=internetarchive', '', 'height=400,width=600'); return false;" title="Share on Twitter" style="margin-right:5px;" target="_blank"><span class="iconochive-twitter" style="color:#1dcaff;font-size:160%;"></span></a>
</div>
</div>
<table class="c" style="">
<tbody>
<tr>
<td class="u" colspan="2">
<form target="_top" method="get" action="https://web.archive.org/web/submit" name="wmtb" id="wmtb"><input type="text" name="url" id="wmtbURL" value="https://www.btproof.com/" onfocus="this.focus();this.select();" /><input type="hidden" name="type" value="replay" /><input type="hidden" name="date" value="20160114165710" /><input type="submit" value="Go" /></form>
</td>
<td class="n" rowspan="2" style="width:110px;">
<table>
<tbody>
<!-- NEXT/PREV MONTH NAV AND MONTH INDICATOR -->
<tr class="m">
<td class="b" nowrap="nowrap"><a href="https://web.archive.org/web/20151121073729/http://www.btproof.com/" title="21 Nov 2015"><strong>Nov</strong></a></td>
<td class="c" id="displayMonthEl" title="You are here: 16:57:10 Jan 14, 2016">JAN</td>
<td class="f" nowrap="nowrap"><a href="https://web.archive.org/web/20160304020455/https://www.btproof.com/" title="04 Mar 2016"><strong>Mar</strong></a></td>
</tr>
<!-- NEXT/PREV CAPTURE NAV AND DAY OF MONTH INDICATOR -->
<tr class="d">
<td class="b" nowrap="nowrap"><a href="https://web.archive.org/web/20160109091003/http://btproof.com/" title="09:10:03 Jan 09, 2016"><img src="images/wm_tb_prv_on.png" alt="Previous capture" width="14" height="16" border="0" /></a></td>
<td class="c" id="displayDayEl" style="width:34px;font-size:24px;white-space:nowrap;" title="You are here: 16:57:10 Jan 14, 2016">14</td>
<td class="f" nowrap="nowrap"><a href="https://web.archive.org/web/20160304020455/https://www.btproof.com/" title="02:04:55 Mar 04, 2016"><img src="images/wm_tb_nxt_on.png" alt="Next capture" width="14" height="16" border="0" /></a></td>
</tr>
<!-- NEXT/PREV YEAR NAV AND YEAR INDICATOR -->
<tr class="y">
<td class="b" nowrap="nowrap"><a href="https://web.archive.org/web/20141219030557/https://www.btproof.com/" title="19 Dec 2014"><strong>2014</strong></a></td>
<td class="c" id="displayYearEl" title="You are here: 16:57:10 Jan 14, 2016">2016</td>
<td class="f" nowrap="nowrap"><a href="https://web.archive.org/web/20170516112717/http://btproof.com/" title="16 May 2017"><strong>2017</strong></a></td>
</tr>
</tbody>
</table>
</td>
</tr>
<tr>
<td class="s">
<div id="wm-nav-captures">
<a class="t" href="https://web.archive.org/web/20160114165710*/https://www.btproof.com/" title="See a list of every capture for this URL">38 captures</a>
<div class="r" title="Timespan for captures of this URL">11 Jul 2013 - 29 Dec 2018</div>
</div>
</td>
<td class="k">
<a href="#" id="wm-graph-anchor">
<div id="wm-ipp-sparkline" title="Explore captures for this URL" style="position: relative">
<canvas id="wm-sparkline-canvas" width="600" height="27" border="0"></canvas>
</div>
</a>
</td>
</tr>
</tbody>
</table>
<div style="position:absolute;bottom:0;right:2px;text-align:right;">
<a id="wm-expand" class="wm-btn wm-closed" href="#expand" onclick="__wm.ex(event);return false;"><span id="wm-expand-icon" class="iconochive-down-solid"></span> <span style="font-size:80%">About this capture</span></a>
</div>
</div>
<div id="wm-capinfo" style="border-top:1px solid #777;display:none; overflow: hidden">
<div style="background-color:#666;color:#fff;font-weight:bold;text-align:center">COLLECTED BY</div>
<div style="padding:3px;position:relative" id="wm-collected-by-content">
<div style="display:inline-block;vertical-align:top;width:50%;">
<span class="c-logo" style="background-image:url(https://archive.org/services/img/webwidecrawl);"></span>
Organization: <a style="color:#33f;" href="https://archive.org/details/webwidecrawl" target="_new"><span class="wm-title">Internet Archive</span></a>
<div style="max-height:75px;overflow:hidden;position:relative;">
<div style="position:absolute;top:0;left:0;width:100%;height:75px;background:linear-gradient(to bottom,rgba(255,255,255,0) 0%,rgba(255,255,255,0) 90%,rgba(255,255,255,255) 100%);"></div>
The Internet Archive discovers and captures web pages through many different web crawls.

At any given time several distinct crawls are running, some for months, and some every day or longer.

View the web archive through the <a href="http://archive.org/web/web.php">Wayback Machine</a>.
</div>
</div>
<div style="display:inline-block;vertical-align:top;width:49%;">
<span class="c-logo" style="background-image:url(https://archive.org/services/img/survey_00004)"></span>
<div>Collection: <a style="color:#33f;" href="https://archive.org/details/survey_00004" target="_new"><span class="wm-title">Survey Crawl Number 4 - Started Jan 9th, 2016 - Ended Feb 25th, 2016</span></a></div>
<div style="max-height:75px;overflow:hidden;position:relative;">
<div style="position:absolute;top:0;left:0;width:100%;height:75px;background:linear-gradient(to bottom,rgba(255,255,255,0) 0%,rgba(255,255,255,0) 90%,rgba(255,255,255,255) 100%);"></div>
<p>The seed for this crawl was a list of every host in the Wayback Machine</p>

<p>This crawl was run at a level 1 (URLs including their embeds, plus the URLs of all outbound links including their embeds)</p>

<p>The WARC files associated with this crawl are not currently available to the general public.</p>
</div>
</div>
</div>
<div style="background-color:#666;color:#fff;font-weight:bold;text-align:center" title="Timestamps for the elements of this page">TIMESTAMPS</div>
<div>
<div id="wm-capresources" style="margin:0 5px 5px 5px;max-height:250px;overflow-y:scroll !important"></div>
<div id="wm-capresources-loading" style="text-align:left;margin:0 20px 5px 5px;display:none"><img src="images/loading.gif" alt="loading" /></div>
</div>
</div></div></div></div><script type="text/javascript">
__wm.bt(600,27,25,2,"web","https://www.btproof.com/","2016-01-14",1996,"https://web.archive.org/static/");
</script>
<!-- END WAYBACK TOOLBAR INSERT --><div class="navbar navbar-fixed-top"><div class="navbar-inner"><div class="container"><a href="index.html" class="brand">BTProof</a><ul class="nav"><li><a href="index.html">Create timestamp </a></li><li><a href="https://web.archive.org/web/20160309210740/https://www.btproof.com/order.html">No Bitcoins? </a></li><li><a href="https://web.archive.org/web/20160114165710/mailto:hello@btproof.com">Contact </a></li></ul><ul class="nav pull-right"><li><a href="https://web.archive.org/web/20160114165710/https://github.com/shesek/btproof/">Source on GitHub <i class="icon-share-alt icon-white"></i></a></li></ul></div></div></div><div class="container"><header class="subhead"><h1>BTProof</h1><p class="lead">Trusted timestamping on the Bitcoin blockchain</p></header><div class="row-fluid"><div class="span7"><dl><dt id="what">What is trusted timestamping?</dt><dd><p>Trusted timestamping allows to prove you held a document, some information or a file at some specific point in time,
in a way that can't be forged. <a href="https://web.archive.org/web/20160114165710/http://en.wikipedia.org/wiki/Trusted_timestamping">Read more at Wikipedia</a>.</p>
</dd><dt id="uses">What is it good for?</dt><dd><ul>
<li>Before signing an NDA, you can keep a trusted proof of the knowledge you had in that field prior
to to signing it.</li>
<li>You can prove you developed a specific revesion of your software in a specific point in time by
timestamping the hash of your revision tree. With Git, its as simple as timestamping the
current commit SHA1.</li>
<li>Before sharing your ideas with third parties, you can timestamp the information you're about to share
with them, as well as the fact that you're sharing it with them, to help resolve possible disputes.</li>
<li>Contracts can be timestamped (along with digital signatures of both parties) to prove when they were
signed.</li>
<li>Musicians and other digital art producers can prove when they created their work.</li>
</ul>
</dd><dt id="how">How does timestamping on the Bitcoin network work?</dt><dd><p>Its possible to <a href="https://web.archive.org/web/20160114165710/http://en.wikipedia.org/wiki/Cryptographic_hash_function">hash</a> the data you wish to timestamp
and <a href="technical.html">turn it into a Bitcoin address</a>. By making a small payment (a satoshi, or 0.00000001 BTC) to it, the
payment is stored on the blockchain along with the address you paid to.</p>
<p>Since only the hash is stored on the Bitcoin blockchain, no one can tell what data you stored, but given the
pre-hashed data you can prove the data was created prior to the <a href="https://web.archive.org/web/20160114165710/https://en.bitcoin.it/wiki/Blocks">block</a> that
contains the payment made to that address.</p>
<p><strong>Update:</strong> Bitcoin-qt 0.8.2 doesn't relay transactions with small outputs by default. A lot of miners still accepts
those transactions, so it'll work fine in the short-term (and once the transactions is accepted into a block, it'll be part
the Bitcoin network forever). This method will be replaced in the future, when it becomes difficult to send those transactions.</p>
</dd><dt id="why">What are the advantages of using the Bitcoin network?</dt><dd><ul>
<li><strong>You're not dependent on any single authority.</strong> Traditionally, trusted timestamps are issued by trusted third parties
called TSAs (Time Stamping Authority), which are prone to data corruption and tampering. On the Bitcoin blockchain,
your timestamp is safely stored all over the world, and is <em>much</em> harder to tamper with.</li>
<li><strong>Its anonymous.</strong> No one knows who you are, what data you're timestamping, or even the fact that you're
timestamping anything.</li>
<li><strong>Its really cheap.</strong> At the current rates (~$110), including the transaction fees, it costs around 5 cents.
You can make a transaction without fees, lowering the cost to $0.00000116, a fraction of a cent.
However, it is highly recommended to pay the fees to support the miners who verify your timestamp with
their computing resources. In addition to that, making such a tiny transaction without fees might take long
to get into the blockchain, if ever.</li>
<li><strong>Its really simple.</strong> You can create trusted timestamps using any Bitcoin client, and its easy to automate the process
using bitcoin's <a href="https://web.archive.org/web/20160114165710/https://en.bitcoin.it/wiki/API_reference_(JSON-RPC)">JSON-RPC API</a>.</li>
</ul>
</dd><dt id="legal">Will it hold in court?</dt><dd><p><strong>IANAL, TINLA</strong>. That being said, I believe it will. From a technical point of view, its
<a href="https://web.archive.org/web/20160114165710/https://en.bitcoin.it/wiki/Weaknesses#Attacker_has_a_lot_of_computing_power">nearly</a> impossible
(much more so than with TSAs) to fake a timestamp created like that. You will probably need to bring a
technical expert to testify to that.</p>
</dd><dt id="destroy-coins">Doesn't it destroy the Bitcoins used to pay to that address?</dt><dd><p>Yes. The coins are sent to an address that they can never be redeemed from, effectively taking them
out of circulation.
However, because its only a fraction of a bitcoin, the effect is minimal. To put this in perspective,
creating one <strong>b</strong>illion timestamps is equal to 10 BTC being lost due to someone losing his private keys
(which is quite common and happens on much larger scale). </p>
<!--You could technically create a *private* key<using>the hashed data, make a payment to it, and than transfer the money back - but the transaction might be deleted</using><once>its no longer needed. I believe its safer to "lock" 1 satoshi at that address, to ensure the network will keep</once><track>of that forever.</track>--></dd></dl></div><div class="timestamp span5"><fieldset><legend>Create a trusted timestamp</legend><noscript><div class="alert alert-error">The hashing process requires JavaScript. Please use a JavaScript-enabled browser.</div></noscript><ul class="nav nav-tabs"><li class="active"><a href="#text" data-toggle="tab">From Text</a></li><li><a href="#file" data-toggle="tab">Upload File</a></li><li><a href="#hash" data-toggle="tab">Already have an hash?</a></li></ul><div class="tab-content"><div id="text" class="tab-pane active"><p>Enter the text you wish to timestamp:</p><textarea></textarea></div><div id="file" class="tab-pane"><p>Select a file to timestamp:</p><input type="file"></div><div id="hash" class="tab-pane"><p>Enter your hash:</p><input type="text"></div></div><div class="muted">The data (both from text and from a file) is hashed locally in your browser, and is never uploaded to the server. Still, if you're timestamping
sensitive information, you're advised to hash it locally (howto:
<a data-toggle="tooltip" title="TLDR: sha256sum file" href="https://web.archive.org/web/20160114165710/http://linux.die.net/man/1/sha256sum">Linux</a>,
<a data-toggle="tooltip" title="Download md5deep" href="https://web.archive.org/web/20160114165710/http://md5deep.sourceforge.net/">Windows</a>,
<a data-toggle="tooltip" title="TLDR: shasum -a 256 file" href="https://web.archive.org/web/20160114165710/https://developer.apple.com/library/mac/#documentation/Darwin/Reference/Manpages/man1/shasum.1.html">Mac</a>)
and only input the hash using the "Already have an hash?" tab.</div><div class="btns"><button id="pay" data-toggle="tooltip" data-placement="bottom" title="Make a payment to the generated address with your Bitcoin client" class="btn btn-primary">Create Timestamp </button> <button id="no-bitcoins" data-toggle="tooltip" data-placement="bottom" title="We offer a service where we do the Bitcoin transaction for you. Click for more information." data-url="https://www.btproof.com/order.html" class="btn">No Bitcoins?</button> <button id="check-timestamp" data-toggle="tooltip" data-placement="bottom" title="Check if the given data already exists on the blockchain, and since when." class="btn">Check timestamp</button></div><div id="result">Address: <span class="address"></span></div></fieldset><div class="error alert alert-error"></div><h4>Please read this carefully:</h4>
<ul>
<li><strong>You must keep an exact copy of the pre-hashed data.</strong> If you cannot provide the original
data that hashes to the address, you cannot prove anything using the hash alone.</li>
<li><strong>Ensure the data you're hashing includes information about who you are.</strong> If you're timestamping
a file hash, you can timestamp a message like <em>"I, John Due, from ..., born ...,
with the goverment issued ID ..., have a copy of the file that hashes to ..."</em>. In this case, you
must keep both the file and the exact wording you used for the message. Alternatively, you can
create a zip that contains the file(s) and a text file identifying you, and keep a copy of that zip.</li>
<li><strong>The timestamp is accurate to a few hours precision.</strong> You can prove the data existed prior to the
block which includes your payment. Blocks are created roughly every 10 minutes, but it might take a few until
your payment is included.</li>
<li>Checking the timestamp is done using the <a href="https://web.archive.org/web/20160114165710/http://blockchain.info/q">blockchain.info api</a>.
If you require highly reliable result, you're advised to <strong>verify the timestamp</strong> with the Bitcoin network.</li>
<li>To <strong>reproduce the address yourself</strong> (important in case this website is unavailable),
see the <a href="technical.html">technical explaination</a>. Its really simple - 3 lines of pseudocode.</li>
</ul>
</div></div><footer class="muted"><div class="pull-right"><p>Tips: <a href="https://web.archive.org/web/20160114165710/bitcoin:1ARAWK8etGddPr3Rb5RgfFD66CpXbkcXf7">1ARAWK8etGddPr3Rb5RgfFD66CpXbkcXf7</a></p>
</div><p>Website content licensed under <a href="https://web.archive.org/web/20160114165710/http://creativecommons.org/licenses/by/3.0/">CC-BY 3.0</a>,
and <a href="https://web.archive.org/web/20160114165710/https://github.com/shesek/btproof/">source code</a> under the
<a href="https://web.archive.org/web/20160114165710/https://github.com/shesek/btproof/blob/master/LICENSE">MIT License</a>.</p>
</footer></div><script src="jquery.min.html"></script><script src="bootstrap.min.html"></script><script src="timestamp.html"></script><script>(function(a,b,c,d,e,f,g){a.GoogleAnalyticsObject=e,a[e]=a[e]||function(){(a[e].q=a[e].q||[]).push(arguments)},a[e].l=1*new Date,f=b.createElement(c),g=b.getElementsByTagName(c)[0],f.async=1,f.src=d,g.parentNode.insertBefore(f,g)})(window,document,"script","analytics.html","ga"),ga("create","UA-29683945-1","btproof.com"),ga("send","pageview");</script></body>
<!-- Mirrored from web.archive.org/web/20160114165710/https://www.btproof.com/ by HTTrack Website Copier/3.x [XR&CO'2014], Fri, 05 Apr 2019 23:16:02 GMT -->
</html><!--
FILE ARCHIVED ON 16:57:10 Jan 14, 2016 AND RETRIEVED FROM THE
INTERNET ARCHIVE ON 23:15:29 Apr 05, 2019.
JAVASCRIPT APPENDED BY WAYBACK MACHINE, COPYRIGHT INTERNET ARCHIVE.

ALL OTHER CONTENT MAY ALSO BE PROTECTED BY COPYRIGHT (17 U.S.C.
SECTION 108(a)(3)).
-->
<!--
playback timings (ms):
LoadShardBlock: 58.509 (3)
esindex: 0.008
captures_list: 87.201
CDXLines.iter: 11.58 (3)
PetaboxLoader3.datanode: 75.627 (4)
exclusion.robots: 0.304
exclusion.robots.policy: 0.293
RedisCDXSource: 13.689
PetaboxLoader3.resolve: 117.819
load_resource: 136.649
-->
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251