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In block 277,316 we see that the coinbase (see Example 8-4), which is in the “Unlocking Script” or scriptSig field of the transaction input, contains the hexadecimal value 03443b0403858402062f503253482f. Let’s decode this value. The first byte, 03 instructs the script execution engine to push the next 3 bytes onto the script stack (see Table C-1). The next 3 bytes, 0x443b04, are the block height encoded in little-endian format (backwards, least significant byte first). Reverse the order of the bytes and the result is 0x043b44 which is 277,316 in decimal. The next few hexadecimal digits (03858402062) are used to encode an extra nonce (See “The Extra Nonce Solution” on page 210), or random value, used to find a suitable Proof- of-Work solution. The final part of the coinbase data (2f503253482f) is the ASCII-encoded string “/ P2SH/”, which indicates that the mining node that mined this block supports the Pay- to-Script-Hash (P2SH) improvement defined in BIP0016. The introduction of the P2SH capability required a “vote” by miners to endorse either BIP0016 or BIP0017. Those endorsing the BIP0016 implementation were to include “/P2SH/” in their coinbase data. Those endorsing the BIP0017 implementation of P2SH were to include the string “p2sh/ CHV” in their coinbase data. The BIP0016 was elected as the winner, and many miners continued including the string “/P2SH/” in their coinbase to indicate support for this feature. The code example Example 8-6 uses the libbitcoin library introduced in “Alternative clients, libraries and toolkits” on page 56 to extract the coinbase data from the genesis block, displaying Satoshi’s message. Note that the libbitcoin library contains a static copy of the genesis block, so the example code below can use retrieve the genesis block directly from the library. Example 8-6. Extract the coinbase data from the genesis block /* Display the genesis block message by Satoshi. */ #includePDF Image | Mastering Bitcoin
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