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bitcoin block hash (python)
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| import requests | |
| import hashlib | |
| import struct | |
| def load_block_data(block_hash): | |
| r = requests.get('https://blockchain.info/ko/rawblock/' + block_hash) | |
| return r.json() | |
| def block_hash(version: int, | |
| prevblock, | |
| merkle_root, | |
| time: int, | |
| bits: int, | |
| nonce: int): | |
| prevblock_little = bytearray.fromhex(prevblock)[::-1] | |
| merkle_root_little = bytearray.fromhex(merkle_root)[::-1] | |
| # pack binary little endian | |
| header_bin = struct.pack( | |
| # < : little endian | |
| # i : signed int (32 bit) - + | |
| # I : unsigned int (32 bit) + | |
| # 32s : 32 byte (char) | |
| # <i32s32sIII = little endian | int | byte[32] | byte[32] | unsigned int | unsigned int | unsigned int | |
| '<i32s32sIII', | |
| version, | |
| prevblock_little, # little -> big | |
| merkle_root_little, # little -> big | |
| time, | |
| bits, | |
| nonce, | |
| ) | |
| # double hash | |
| h = hashlib.sha256( | |
| hashlib.sha256(header_bin).digest() | |
| ).digest() | |
| return h | |
| # load block data from blockchain info | |
| block = load_block_data("000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f") | |
| # calculate block hash | |
| hashed_block_header = block_hash( | |
| version=block['ver'], | |
| prevblock=block['prev_block'], | |
| merkle_root=block['mrkl_root'], | |
| time=block['time'], | |
| bits=block['bits'], | |
| nonce=block['nonce'], | |
| ) | |
| # block hash to hex string | |
| hex = hashed_block_header[::-1].hex() | |
| print(hex) |
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