Simple proof-of-work example in Python 3

pow.py

import time, hashlib

# max nonces should scale with 
# the difficulty, haven't calculated 
# how to do that tho
max_nonces = 500000
difficulty = 4
pattern = '0' * difficulty
payload = f't={time.time()}&m=This is an example message!'
check_hash = b''

print(f'[Task] Solve hash with difficulty {difficulty}')

# creates a SHA512 hash based 
# off the payload and the given 
# nonce
def mhash(nonce) -> str:
    return hashlib.sha512(f'{payload}&n={nonce}'.encode()).hexdigest()

# while the nonce is lower
# than the max nonces counter
# try and guess the hash
nonce = 0
while nonce < max_nonces:
    check_hash = mhash(nonce) # create the hash

    print(f'[Miner/Client] Hash: {check_hash} | Pattern: {pattern} | Nonce: {nonce}')
    if check_hash.startswith(pattern): # check if it matches the pattern
        break

    nonce +=1
    
print(f'[Miner/Client] Finished! Hash: {check_hash}, Nonce: {nonce}')

print(f'\nChecking...')
if mhash(nonce).startswith(pattern): # check if the hash matches the pattern
    print('PoW completed!')
else:
    print('Failed!')