82 lines
6.7 KiB
XML
82 lines
6.7 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<?xml-stylesheet type="text/xsl" href="../assets/xml/rss.xsl" media="all"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Caught in the Net (Posts about wright)</title><link>francescomecca.eu</link><description></description><atom:link href="francescomecca.eu/categories/wright.xml" rel="self" type="application/rss+xml"></atom:link><language>en</language><copyright>Contents © 2020 <a href="mailto:francescomecca.eu">Francesco Mecca</a> </copyright><lastBuildDate>Wed, 29 Jan 2020 10:04:36 GMT</lastBuildDate><generator>Nikola (getnikola.com)</generator><docs>http://blogs.law.harvard.edu/tech/rss</docs><item><title>Why Wright's proof is a fake</title><link>francescomecca.eu/blog/2016/5/3/satoshisignature/</link><dc:creator>Francesco Mecca</dc:creator><description><div><p>I explained in my previous <a href="http://francescomecca.eu/pescewanda/2016/04/17/wright-nakamoto/">post</a> (in italian) that the signature that Wright provided as a public proof is in fact invalid.
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I want to explain briefly how you could check this claim.
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The key in Wright's <a href="http://www.drcraigwright.net/jean-paul-sartre-signing-significance/">post</a> is this:</p>
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<pre class="code literal-block"><span></span>------------------------- Signature File -------------------------
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MEUCIQDBKn1Uly8m0UyzETObUSL4wYdBfd4ejvtoQfVcNCIK4AIgZmMsXNQWHvo6KDd2Tu6euEl1
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3VTC3ihl6XUlhcU+fM4=
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------------------------- End Signature --------------------------
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</pre>
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<p>Now we can use some bash utilities:</p>
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<ul>
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<li>base64, that translates encoded ASCII text;</li>
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<li>hexdump, that displays hexadecimal contents from the input;</li>
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<li>cut, used to remove the binary part of the input;</li>
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<li>tr, used to delete spaces and carriage return from the input;</li>
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</ul>
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<pre class="code literal-block"><span></span>base64 -d &lt;&lt;&lt;'MEUCIQDBKn1Uly8m0UyzETObUSL4wYdBfd4ejvtoQfVcNCIK4AIgZmMsXNQWHvo6KDd2Tu6euEl13VTC3ihl6XUlhcU+fM4=' | hexdump -C| cut -b 11-60| tr -d ' \n'
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3045022100c12a7d54972f26d14cb311339b5122f8c187417dde1e8efb6841f55c34220ae0022066632c5cd4161efa3a2837764eee9eb84975dd54c2de2865e9752585c53e7cce
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</pre>
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<p>Let's analyze the command one by one:</p>
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<ul>
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<li><code>base64 -d</code> decodes the redirected string, the output is some gibberish characters so I won't display them here;</li>
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<li><code>hexdump -C</code> is used with a pipe to convert to hexadecimal:</li>
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</ul>
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<pre class="code literal-block"><span></span>00000000 30 45 02 21 00 c1 2a 7d 54 97 2f 26 d1 4c b3 11 |0E.!..*}T./&amp;.L..|
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00000010 33 9b 51 22 f8 c1 87 41 7d de 1e 8e fb 68 41 f5 |3.Q"...A}....hA.|
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00000020 5c 34 22 0a e0 02 20 66 63 2c 5c d4 16 1e fa 3a |\4"... fc,\....:|
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00000030 28 37 76 4e ee 9e b8 49 75 dd 54 c2 de 28 65 e9 |(7vN...Iu.T..(e.|
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00000040 75 25 85 c5 3e 7c ce |u%..&gt;|.|
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</pre>
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<ul>
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<li>cut -b 11-60 displays only the characters from column 11 to 60:</li>
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</ul>
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<pre class="code literal-block"><span></span>30 45 02 21 00 c1 2a 7d 54 97 2f 26 d1 4c b3 11
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33 9b 51 22 f8 c1 87 41 7d de 1e 8e fb 68 41 f5
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5c 34 22 0a e0 02 20 66 63 2c 5c d4 16 1e fa 3a
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28 37 76 4e ee 9e b8 49 75 dd 54 c2 de 28 65 e9
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75 25 85 c5 3e 7c ce
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</pre>
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<ul>
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<li><code>tr -d ' \n'</code> is used to delete spaces and carriage returns from the output so that is shown in one line and it gives us the final result:</li>
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</ul>
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<pre class="code literal-block"><span></span>3045022100c12a7d54972f26d14cb311339b5122f8c187417dde1e8efb6841f55c34220ae0022066632c5cd4161efa3a2837764eee9eb84975dd54c2de2865e9752585c53e7cce
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</pre>
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<p>If you noticed, there is also another cleartext string at the beginning of Wright's post:</p>
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<pre class="code literal-block"><span></span>$ base64 -d <span class="o">&lt;&lt;&lt;</span><span class="s1">'IFdyaWdodCwgaXQgaXMgbm90IHRoZSBzYW1lIGFzIGlmIEkgc2lnbiBDcmFpZyBXcmlnaHQsIFNhdG9zaGkuCgo='</span>
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Wright, it is not the same as <span class="k">if</span> I sign Craig Wright, Satoshi.
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</pre>
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<p>Now let's head to blockchain.info.
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Blockchain.info has a little <a href="https://blockchain.info/decode-tx">utility</a> to get hexadecimal informations out of a transaction on the blockchain, so let's use it to get the related info about this transaction:</p>
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<p><a href="https://blockchain.info/tx/828ef3b079f9c23829c56fe86e85b4a69d9e06e5b54ea597eef5fb3ffef509fe">tx/828ef3b079f9c23829c56fe86e85b4a69d9e06e5b54ea597eef5fb3ffef509fe</a>
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<a href="https://blockchain.info/tx/828ef3b079f9c23829c56fe86e85b4a69d9e06e5b54ea597eef5fb3ffef509fe?format=hex">tx/828ef3b079f9... in hexadecimal</a></p>
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<p>As you can see the entire output of the first bash command, that is</p>
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<pre class="code literal-block"><span></span>3045022100c12a7d54972f26d14cb311339b5122f8c187417dde1e8efb6841f55c34220ae0022066632c5cd4161efa3a2837764eee9eb84975dd54c2de2865e9752585c53e7cce
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</pre>
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<p>is contained in:</p>
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<pre class="code literal-block"><span></span>"script":"483045022100c12a7d54972f26d14cb311339b5122f8c187417dde1e8efb6841f55c34220ae0022066632c5cd4161efa3a2837764eee9eb84975dd54c2de2865e9752585c53e7cce01"
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</pre>
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<p>except for the 48 at the beginning and the 01 at the end.</p>
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<p>That is a signature hash:
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this <a href="https://en.bitcoin.it/wiki/List_of_address_prefixes">page</a> explains that the 48 is just a decimal prefix given to uncompressed transactions, and the 01 at the end is just a SIGHASH_ALL <a href="https://bitcoin.org/en/glossary/signature-hash">code</a> that flags the end of the signature.</p>
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<h3>So, is it a fake?</h3>
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<p>Yes, indeed.
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At the end, I ask, why would you choose anything else than the easiest and most conclusive way to prove something?</p>
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<p><img alt='Wright "signs" the blockchain' src="francescomecca.eu/wp-content/uploads/2016/satosh.jpg"></p></div></description><category>Bitcoin</category><category>PesceWanda</category><category>satoshi nakamoto scam</category><category>scam</category><category>wright</category><guid>francescomecca.eu/blog/2016/5/3/satoshisignature/</guid><pubDate>Tue, 03 May 2016 00:00:00 GMT</pubDate></item></channel></rss> |