cool_python_apps/2_bitcoin_mining/bitcoin_mining.py at main · codebasics/cool_python_apps · GitHub

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from hashlib import sha256

MAX_NONCE = 100000000000

def SHA256(text):

return sha256(text.encode("ascii")).hexdigest()

def mine(block_number, transactions, previous_hash, prefix_zeros):

prefix_str = '0'*prefix_zeros

for nonce in range(MAX_NONCE):

text = str(block_number) + transactions + previous_hash + str(nonce)

new_hash = SHA256(text)

if new_hash.startswith(prefix_str):

print(f"Yay! Successfully mined bitcoins with nonce value:{nonce}")

return new_hash

raise BaseException(f"Couldn't find correct has after trying {MAX_NONCE} times")

if __name__=='__main__':

transactions='''

Dhaval->Bhavin->20,

Mando->Cara->45

'''

difficulty=4 # try changing this to higher number and you will see it will take more time for mining as difficulty increases

import time

start = time.time()

print("start mining")

new_hash = mine(5,transactions,'0000000xa036944e29568d0cff17edbe038f81208fecf9a66be9a2b8321c6ec7', difficulty)

total_time = str((time.time() - start))

print(f"end mining. Mining took: {total_time} seconds")

print(new_hash)

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