bitcoin miner

miner.py

from hashlib import sha256

MAX_NONCE = 10000000


def create_sha256(text):
    return sha256(text.encode("ascii")).hexdigest()


def mining(block_number, transactions, prev_hash, difficulty):
    prefix = "0" * difficulty

    for nonce in range(MAX_NONCE):
        data = str(block_number) + transactions + prev_hash + str(nonce)
        new_hash = create_sha256(data)
        print(f"Hash: #{new_hash}")

        if new_hash.startswith(prefix):
            return new_hash

    raise BaseException(f"{MAX_NONCE} tries!, Not found!")


if __name__ == "__main__":
    current_block = "723456"  # blockzeit

    transactions = """
   Alice sent Bob 20BTC
   Dan sent Alice 0.1BTC
   Joe sent Bob 0.1BTC
   """
    prev_hash = "4de47816db8157eee55ca16a14c0ef117978fd1ec6925b7bd629c57ba9bc9de1"
    difficulty = 5

    import time

    print("start mining")
    start = time.time()
    hash = mining(current_block, transactions, prev_hash, difficulty)
    total_time_in_sec = time.time() - start
    print("Hash gefunden: #" + hash)
    print("Dauer: {:.1f} Sekunden".format(total_time_in_sec))