【比特币】创世块-GenesisBlock

// HarryWu, generate genesis block by genesis.py as following:
//
// genesis # python genesis.py \
//   -t $(date +%s) \
//   -z "shanghai stock index closed at 2343.57, on 24th Sept., 2014" \
//   -a SHA256 \
//   -p 049e02fa9aa3c19a3b112a58bab503c5caf797972f5cfe1006275aa5485a01b48f9f648bc5380ee1e82dc6f474c8e0f7e2f6bbd0de9355f92496e3ea327ccb19cc \
//   -v 10000000000
//

// Raw block data: 04????????


// algorithm: SHA256


// merkle hash: 7bf229f629a6666596c1ce57117c28d1d29299e8a5303347929bd70847c49adb


// pszTimestamp: shanghai stock index closed at 2343.57, on 24th Sept., 2014


// pubkey: 049e02fa9aa3c19a3b112a58bab503c5caf797972f5cfe1006275aa5485a01b48f9f648bc5380ee1e82dc6f474c8e0f7e2f6bbd0de9355f92496e3ea327ccb19cc


// time: 1411666331


// bits: 0x1d00ffff


// Searching for genesis hash..

//
// nonce: 2056985438
// genesis hash: 0000000061b1aca334b059920fed7bace2336ea4d23d63428c7aee04da49e942

脚本源代码

import hashlib, binascii, struct, array, os, time, sys, optparse
import scrypt

from construct import *


def main():
  options = get_args()

  algorithm = get_algorithm(options)

  # https://en.bitcoin.it/wiki/Difficulty
  bits, target   = get_difficulty(algorithm)

  input_script  = create_input_script(options.timestamp)
  output_script = create_output_script(options.pubkey)
  # hash merkle root is the double sha256 hash of the transaction(s) 
  tx = create_transaction(input_script, output_script,options)
  hash_merkle_root = hashlib.sha256(hashlib.sha256(tx).digest()).digest()
  print_block_info(options, hash_merkle_root, bits)

  block_header        = create_block_header(hash_merkle_root, options.time, bits, options.nonce)
  genesis_hash, nonce = generate_hash(block_header, algorithm, options.nonce, target)
  announce_found_genesis(genesis_hash, nonce)


def get_args():
  parser = optparse.OptionParser()
  parser.add_option("-t", "--time", dest="time", default=int(time.time()), 
                   type="int", help="the (unix) time when the genesisblock is created")
  parser.add_option("-z", "--timestamp", dest="timestamp", default="The Times 03/Jan/2009 Chancellor on brink of second bailout for banks",
                   type="string", help="the pszTimestamp found in the coinbase of the genesisblock")
  parser.add_option("-n", "--nonce", dest="nonce", default=0,
                   type="int", help="the first value of the nonce that will be incremented when searching the genesis hash")
  parser.add_option("-a", "--algorithm", dest="algorithm", default="SHA256",
                    help="the PoW algorithm: [SHA256|scrypt|X11|X13|X15]")
  parser.add_option("-p", "--pubkey", dest="pubkey", default="04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f",
                   type="string", help="the pubkey found in the output script")
  parser.add_option("-v", "--value", dest="value", default=5000000000,
                   type="int", help="the value in coins for the output, full value (exp. in bitcoin 5000000000 - To get other coins value: Block Value * 100000000)")

  (options, args) = parser.parse_args()
  return options

def get_algorithm(options):
  supported_algorithms = ["SHA256", "scrypt", "X11", "X13", "X15"]
  if options.algorithm in supported_algorithms:
    return options.algorithm
  else:
    sys.exit("Error: Given algorithm must be one of: " + str(supported_algorithms))

def get_difficulty(algorithm):
  if algorithm == "scrypt":
    return 0x1e0ffff0, 0x0ffff0 * 2**(8*(0x1e - 3))
  elif algorithm == "SHA256":
    return 0x1d00ffff, 0x00ffff * 2**(8*(0x1d - 3)) 
  elif algorithm == "X11" or algorithm == "X13" or algorithm == "X15":
    return 0x1e0ffff0, 0x0ffff0 * 2**(8*(0x1e - 3))

def create_input_script(psz_timestamp):
  psz_prefix = ""
  #use OP_PUSHDATA1 if required
  if len(psz_timestamp) > 76: psz_prefix = '4c'

  script_prefix = '04ffff001d0104' + psz_prefix + chr(len(psz_timestamp)).encode('hex')
  print (script_prefix + psz_timestamp.encode('hex'))
  return (script_prefix + psz_timestamp.encode('hex')).decode('hex')


def create_output_script(pubkey):
  script_len = '41'
  OP_CHECKSIG = 'ac'
  return (script_len + pubkey + OP_CHECKSIG).decode('hex')


def create_transaction(input_script, output_script,options):
  transaction = Struct("transaction",
    Bytes("version", 4),
    Byte("num_inputs"),
    StaticField("prev_output", 32),
    UBInt32('prev_out_idx'),
    Byte('input_script_len'),
    Bytes('input_script', len(input_script)),
    UBInt32('sequence'),
    Byte('num_outputs'),
    Bytes('out_value', 8),
    Byte('output_script_len'),
    Bytes('output_script',  0x43),
    UBInt32('locktime'))

  tx = transaction.parse('\x00'*(127 + len(input_script)))
  tx.version           = struct.pack('
 
  
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