Mining PyChain

mine_pychain.py

import hashlib

difficulty = 4
pattern = '0000'

def calculate_hash(data_to_hash):
    return hashlib.sha256(data_to_hash.encode("utf-8")).hexdigest()

def mine_block(index, prev_hash, timestamp, data):
    for nonce in range(1, maxNonce):
        blockVal = str(index) + str(nonce) + prev_hash + str(timestamp) + data
        hash = calculate_hash(blockVal)
        if hash[:difficulty] == pattern:
            return Block(index, nonce, prev_hash, timestamp, data, hash)