96 lines
4.3 KiB
Markdown
96 lines
4.3 KiB
Markdown
<!--
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.. title: Why Wright's proof is a fake
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.. slug: satoshisignature
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.. date: 2016-05-03
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.. tags: Bitcoin,wright,scam,satoshi nakamoto scam,PesceWanda
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.. category: PesceWanda
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.. link:
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.. description:
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.. type: text
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-->
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I explained in my previous [post](http://francescomecca.eu/pescewanda/2016/04/17/wright-nakamoto/) (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 [post](http://www.drcraigwright.net/jean-paul-sartre-signing-significance/) is this:
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```
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------------------------- Signature File -------------------------
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MEUCIQDBKn1Uly8m0UyzETObUSL4wYdBfd4ejvtoQfVcNCIK4AIgZmMsXNQWHvo6KDd2Tu6euEl1
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3VTC3ihl6XUlhcU+fM4=
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------------------------- End Signature --------------------------
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```
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Now we can use some bash utilities:
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- base64, that translates encoded ASCII text;
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- hexdump, that displays hexadecimal contents from the input;
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- cut, used to remove the binary part of the input;
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- tr, used to delete spaces and carriage return from the input;
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```
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base64 -d <<<'MEUCIQDBKn1Uly8m0UyzETObUSL4wYdBfd4ejvtoQfVcNCIK4AIgZmMsXNQWHvo6KDd2Tu6euEl13VTC3ihl6XUlhcU+fM4=' | hexdump -C| cut -b 11-60| tr -d ' \n'
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3045022100c12a7d54972f26d14cb311339b5122f8c187417dde1e8efb6841f55c34220ae0022066632c5cd4161efa3a2837764eee9eb84975dd54c2de2865e9752585c53e7cce
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```
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Let's analyze the command one by one:
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- `base64 -d` decodes the redirected string, the output is some gibberish characters so I won't display them here;
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- `hexdump -C` is used with a pipe to convert to hexadecimal:
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```
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00000000 30 45 02 21 00 c1 2a 7d 54 97 2f 26 d1 4c b3 11 |0E.!..*}T./&.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%..>|.|
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```
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- cut -b 11-60 displays only the characters from column 11 to 60:
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```
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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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```
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- `tr -d ' \n'` 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:
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```
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3045022100c12a7d54972f26d14cb311339b5122f8c187417dde1e8efb6841f55c34220ae0022066632c5cd4161efa3a2837764eee9eb84975dd54c2de2865e9752585c53e7cce
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```
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If you noticed, there is also another cleartext string at the beginning of Wright's post:
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```
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$ base64 -d <<<'IFdyaWdodCwgaXQgaXMgbm90IHRoZSBzYW1lIGFzIGlmIEkgc2lnbiBDcmFpZyBXcmlnaHQsIFNhdG9zaGkuCgo='
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Wright, it is not the same as if I sign Craig Wright, Satoshi.
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```
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Now let's head to blockchain.info.
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Blockchain.info has a little [utility](https://blockchain.info/decode-tx) to get hexadecimal informations out of a transaction on the blockchain, so let's use it to get the related info about this transaction:
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[tx/828ef3b079f9c23829c56fe86e85b4a69d9e06e5b54ea597eef5fb3ffef509fe](https://blockchain.info/tx/828ef3b079f9c23829c56fe86e85b4a69d9e06e5b54ea597eef5fb3ffef509fe)
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[tx/828ef3b079f9... in hexadecimal](https://blockchain.info/tx/828ef3b079f9c23829c56fe86e85b4a69d9e06e5b54ea597eef5fb3ffef509fe?format=hex)
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As you can see the entire output of the first bash command, that is
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```
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3045022100c12a7d54972f26d14cb311339b5122f8c187417dde1e8efb6841f55c34220ae0022066632c5cd4161efa3a2837764eee9eb84975dd54c2de2865e9752585c53e7cce
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```
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is contained in:
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```
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"script":"483045022100c12a7d54972f26d14cb311339b5122f8c187417dde1e8efb6841f55c34220ae0022066632c5cd4161efa3a2837764eee9eb84975dd54c2de2865e9752585c53e7cce01"
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```
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except for the 48 at the beginning and the 01 at the end.
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That is a signature hash:
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this [page](https://en.bitcoin.it/wiki/List_of_address_prefixes) explains that the 48 is just a decimal prefix given to uncompressed transactions, and the 01 at the end is just a SIGHASH_ALL [code](https://bitcoin.org/en/glossary/signature-hash) that flags the end of the signature.
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## So, is it a fake?
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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?
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