def proof_of_work(self):
last_block = self.__chain[-1]
last_hash = hash_block(last_block)
proof = 0
while not Verification.verify_proof(self.__open_transactions, last_hash, proof): #Will keep executing until the verify_proof return true
proof += 1
return proof
def add_block(self, block):
transactions = [Transaction(tx['sender'], tx['recipient'], tx['signature'], tx['amount']) for tx in block['transactions']]
proof_is_valid = Verification.verify_proof(transactions[:-1], block['previous_hash'], block['proof'])
hashes_match = hash_block(self.chain[-1]) == block['previous_hash']
if not proof_is_valid or not hashes_match:
return False
converted_block = Block(block['index'], block['previous_hash'], transactions, block['proof'],block['timestamp'])
self.__chain.append(converted_block)
stored_transactions = self.__open_transactions[:]
for itx in block['transactions']: #for incoming transactions in block['transactions]
for opentx in stored_transactions:
if opentx.sender == itx['sender'] and opentx.recipient == itx['recipient'] and opentx.amount == itx['amount'] and opentx.signature == itx['signature']:
try:
self.__open_transactions.remove(opentx)
except ValueError:
print('Item was already removed')
self.save_data()
return True