【Python】pythonでProof of work

from random import randint
from hashlib import sha256

previous_hash = "b9b9ee9ffc95fa4956b63b6043a99d0a8f04e0e52e687fc1958d3c6dff885f01"

cnt = 1

nonce = str(randint(0, 1000000))

header = sha256(f'{previous_hash}{nonce}'.encode()).hexdigest()

print(header)

while header[:4] != "0000":
    text = 'loop:{}, header:{}, header[:4]:{}, nonce:{}\n'
    print(text.format(cnt, header, header[:4], nonce))

    nonce = str(randint(0, 1000000))
    header = sha256(f'{previous_hash}{nonce}'.encode()).hexdigest()
    cnt += 1

text = 'loop:{}, header:{}, header[:4]:{}, nonce:{}\n'
print(text.format(cnt, header, header[:4], nonce))

$ python3 test.py
…
loop:17576, header:0000ea27e22db290e4f2163f968bfaf3ff7d58ccf1cd4ab43b3fbc4326c0eb4a, header[:4]:0000, nonce:8978

ほう、これをRustで書きたい & 処理時間に応じたdifficulty(0の個数)の調整機能も追加したい。