Calculate the bitcoin block hash.

block_hashing_algorithm.py

# -*- coding: utf-8 -*-
# python 2.7

import hashlib
import binascii
import time

def uint32(x):
	return x & 0xffffffffL
    
def byteReverse(x):
	return uint32(( ((x) << 24) | (((x) << 8) & 0x00ff0000) | (((x) >> 8) & 0x0000ff00) | ((x) >> 24) ))

def hexstrReverse(s):
    grouplen =2 # 16进制串是2个字符一组
    l =[s[i:i+grouplen] for i in range(0, len(s), grouplen)]
    l.reverse()
    return ''.join(l)

def int2uint(i):
    return i+2**32
    
def CalBlockHash(bockNumber, Version, hashPrevBlock, hashMerkleRoot, Time, Bits, Nonce):
    if isinstance(Version, str):
        if Version[0:2]=='0x':
            Version =Version[2:]
    else:
        Version =hex(byteReverse(Version))[2:-1]
        Version =Version.ljust(8,'0')
    
    utc_delta =0 # blockexplorer.com
    #utc_delta =3600*8 # blockchain.info
    Time =int(time.mktime(time.strptime(Time, '%Y-%m-%d %H:%M:%S'))) + utc_delta
    Time =hexstrReverse(str(hex(Time))[2:])
    
    if isinstance(Bits, str):
        if Bits[0:2]=='0x':
            Bits =Bits[2:]
        Bits =hexstrReverse(Bits)
    else:
        Bits =hex(byteReverse(Bits))[2:-1]

    Nonce =hex(byteReverse(Nonce))[2:-1]
       
    print 'Version=',Version
    print 'hashPrevBlock=',hashPrevBlock
    print 'hashMerkleRoot=',hashMerkleRoot
    print 'Time=',Time
    print 'Bits=',Bits
    print 'Nonce=',Nonce
    
    header_bin = binascii.unhexlify(Version+
        hexstrReverse(hashPrevBlock)+
        hexstrReverse(hashMerkleRoot)+
        Time+Bits+Nonce)
    hash = hashlib.sha256(hashlib.sha256(header_bin).digest()).digest()
    print 'Block Hash of #{0} : {1}\n'.format(bockNumber, binascii.hexlify(hash[::-1]))


def main():
    # Block #125552 , https://blockexplorer.com/block/00000000000000001e8d6829a8a21adc5d38d0a473b144b6765798e61f98bd1d
    bockNumber =125552
    Version ="0x01000000" # Version 1  01000000
    hashPrevBlock ="00000000000008a3a41b85b8b29ad444def299fee21793cd8b9e567eab02cd81"
    hashMerkleRoot ="2b12fcf1b09288fcaff797d71e950e71ae42b91e8bdb2304758dfcffc2b620e3"
    # blockchain.info + 8h  2011-05-21 17:26:31
    # blockexplorer.com ok  2011-05-22 01:26:31
    Time ="2011-05-22 01:26:31" # 时间戳 c7f5d74d
    Bits ="1a44b9f2"  # 计算目标 "f2b9441a",  16进制需要时 str 类型
    Nonce =2504433986 # 随机数	"42a14695", 10进制需要 int 类型
    # Test OK.
    CalBlockHash(bockNumber, Version, hashPrevBlock, hashMerkleRoot, Time, Bits, Nonce)
    
    
    # Block #473360 , https://blockexplorer.com/block/0000000000000000003e0d2c40f8fd444c389a295ad134ffea7127836019ef3a
    bockNumber =473360
    Version =536870912
    hashPrevBlock ="000000000000000000ec1e51406b39ac67d298fcebec7c8b4cc24037e1197a8e"
    hashMerkleRoot ="4d8f6da5972fc13d13bc1f11e103502930c8056a578673f1891ea192feb5f3da"
    Time ="2017-06-29 16:06:01"  
    Bits ="18018b7e" 
    Nonce =426804529
    # Test ERROR!  Block Hash of #473360 : d69e40c66c882514b9adbd29936a6511b1d4afae1082b154e1b089571526d592
    CalBlockHash(bockNumber, Version, hashPrevBlock, hashMerkleRoot, Time, Bits, Nonce)
    

if __name__ == "__main__":
    main()