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Title: Genesis block raw dump? Post by: ThePiachu on November 23, 2011, 07:39:11 PM I`m implementing some low-level Bitcoin operations currently, and I want to recreate the genesis block so I can communicate with the network. As I'm writing the implementation from scratch, and there are no raw dumps of the genesis block (getting to low level byte dumps), can someone check if what my code is generating is a proper dump of the genesis block?
01000000 - version 0000000000000000000000000000000000000000000000000000000000000000 - prev block 4A5E1E4BAAB89F3A32518A88C31BC87F618F76673E2CC77AB2127B7AFDEDA33B - merkle root 29AB5F49 - timestamp FFFF001D - bits 1DAC2B7C - nonce 01000000 - version 01 - number of transaction 01 - inputs 0000000000000000000000000000000000000000000000000000000000000000FFFFFFFF - prev output 4D - script length 04FFFF001D0104455468652054696D65732030332F4A616E2F32303039204368616E63656C6C6F7 2206F6E206272696E6B206F66207365636F6E64206261696C6F757420666F722062616E6B73 - scriptsig FFFFFFFF - sequence 01 - outputs 00F2052A01000000 - 50 BTC 42 - pk_script length 04678AFDB0FE5548271967F1A67130B7105CD6A828E03909A67962E0EA1F61DEB649F6BC3F4CEF3 8C4F35504E51EC112DE5C384DF7BA0B8D578A4C702B6BF11D5F - pk_script AC - OP_Checksig 00000000 - lock time Title: Re: Genesis block raw dump? Post by: theymos on November 23, 2011, 07:55:08 PM Some of your data has the wrong endianness. Definitely the Merkle root, and maybe the difficulty and other things.
Title: Re: Genesis block raw dump? Post by: ThePiachu on November 25, 2011, 08:05:45 PM Okay, fixed the merkle root, as for the bits I'm not really sure whether the Block Explorer reverses that field, or leaves it as is, so I guess I should ask on the SE.
01000000 - version 0000000000000000000000000000000000000000000000000000000000000000 - prev block 3BA3EDFD7A7B12B27AC72C3E67768F617FC81BC3888A51323A9FB8AA4B1E5E4A - merkle root 29AB5F49 - timestamp FFFF001D - bits 1DAC2B7C - nonce 01000000 - version 01 - number of transaction 01 - inputs 0000000000000000000000000000000000000000000000000000000000000000FFFFFFFF - prev output 4D - script length 04FFFF001D0104455468652054696D65732030332F4A616E2F32303039204368616E63656C6C6F7 2206F6E206272696E6B206F66207365636F6E64206261696C6F757420666F722062616E6B73 - scriptsig FFFFFFFF - sequence 01 - outputs 00F2052A01000000 - 50 BTC 42 - pk_script length 04678AFDB0FE5548271967F1A67130B7105CD6A828E03909A67962E0EA1F61DEB649F6BC3F4CEF3 8C4F35504E51EC112DE5C384DF7BA0B8D578A4C702B6BF11D5F - pk_script AC - OP_Checksig 00000000 - lock time Title: Re: Genesis block raw dump? Post by: theymos on November 25, 2011, 11:29:57 PM I think this is the accurate hex:
Code: 01000000 Title: Re: Genesis block raw dump? Post by: ThePiachu on November 28, 2011, 10:15:47 PM Hmm, so the main difference (asides two lines being switched between themselves) is between my lines:
42 - pk_script length 04678AFDB0FE5548271967F1A67130B7105CD6A828E03909A67962E0EA1F61DEB649F6BC3F4CEF3 8C4F35504E51EC112DE5C384DF7BA0B8D578A4C702B6BF11D5F - pk_script AC - OP_Checksig And your lines: 43 4104678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4ce f38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5fac Which is just the inclusion of "41" at the begining of pkscript. Here http://blockexplorer.com/rawblock/000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f we can see the line "scriptPubKey":"04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef3 8c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f OP_CHECKSIG" So where does the "41" come from? Title: Re: Genesis block raw dump? Post by: theymos on November 29, 2011, 12:16:20 AM It's a script op that pushes 0x41 bytes onto the stack.
Title: Re: Genesis block raw dump? Post by: ThePiachu on November 29, 2011, 02:10:35 PM Hmm, isn't that redundant with the pk_script length right before it? Also, I can't find a reference to that script op in the specification of tx https://en.bitcoin.it/wiki/Protocol_specification#tx .
Title: Re: Genesis block raw dump? Post by: Gavin Andresen on November 29, 2011, 04:18:57 PM Hmm, isn't that redundant with the pk_script length right before it? No.Quote Also, I can't find a reference to that script op in the specification of tx https://en.bitcoin.it/wiki/Protocol_specification#tx . See: https://en.bitcoin.it/wiki/ScriptOpcodes 1-75 push data onto the stack. Title: Re: Genesis block raw dump? Post by: ThePiachu on November 29, 2011, 09:36:30 PM That is interesting, didn't expect that from the Tx example. Thanks for the help!
Title: Re: Genesis block raw dump? Post by: MykelSilver on May 23, 2013, 10:13:50 AM When I put this passphase (The Times 03/Jan/2009 Chancellor on brink of second bailout for banks) into the brainwallet from https://www.bitaddress.org/ I got a valid bitaddress: 1Nbm3JoDpwS4HRw9WmHaKGAzaeSKXoQ6Ej
Coincidence? Anyone? Source: https://en.bitcoin.it/wiki/Genesis_block Title: Re: Genesis block raw dump? Post by: ThePiachu on May 23, 2013, 10:15:36 AM When I put this passphase (The Times 03/Jan/2009 Chancellor on brink of second bailout for banks) into the brainwallet from bittaddress.org I got a valid bitaddress: 1Nbm3JoDpwS4HRw9WmHaKGAzaeSKXoQ6Ej Coincidence? Anyone? Source: https://en.bitcoin.it/wiki/Genesis_block One can make a brainwallet out of any string, and some Bitcoin people like to use "lucky charms" in form of phrases like that. Title: Re: Genesis block raw dump? Post by: flake133 on July 05, 2023, 08:06:30 AM Thank you very much for your valuable thoughts so far.
May I ask, is it possible to dumb theymos' hex into Github's SHA256 online-tool to check whether it yields the correct hash? Which is supposed to be this Code: 000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f It doesn't work for me yet. Do I need to apply something like the public-key private-key encryption beforehand? Also, when you, theymos, write that this is proper hex, do you mean that one has to remove the '↵' before? I am sorry, this is perhaps a very stupid question.^^ Thank you very much. SHA256 online-tool: https://emn178.github.io/online-tools/sha256.html Genesis-Block: https://en.bitcoin.it/wiki/Genesis_block Title: Re: Genesis block raw dump? Post by: vjudeu on July 05, 2023, 04:05:09 PM Quote Do I need to apply something like the public-key private-key encryption beforehand? No, you only need to hash the 80-byte block header in binary mode.Code: SHA-256(0100000000000000000000000000000000000000000000000000000000000000000000003ba3edfd7a7b12b27ac72c3e67768f617fc81bc3888a51323a9fb8aa4b1e5e4a29ab5f49ffff001d1dac2b7c)=af42031e805ff493a07341e2f74ff58149d22ab9ba19f61343e2c86c71c5d66d |