-
-
Save Akshay-Arjun/4d3ac7c54aec5368041a7178aaa34f91 to your computer and use it in GitHub Desktop.
bitcoin block hash (python)
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
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) |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment