def add_block(self, block):
transactions = [Transaction(transaction["sender"], transaction["recipient"], transaction["signature"], transaction["amount"]) for transaction in block["transactions"]]
proof_is_valid = Verification.check_valid_proof(transactions[:-1], block["previous_hash"], block["proof"])
hashes_match = hash_util.hash_block(self.chain[-1]) == block["previous_hash"]
if not proof_is_valid or not hashes_match:
return False
converted_block = JBlock(block["index"], block["previous_hash"], transactions, block["proof"], block["timestamp"])
self.__chain.append(converted_block)
stored_transactions = self.open_transactions[:]
for incoming in block["transactions"]:
for open_transaction in stored_transactions:
sender_and_recipient_equal = open_transaction.sender == incoming["sender"] and open_transaction.recipient == incoming["recipient"]
signature_equal = open_transaction.signature == incoming["signature"]
amount_equal = open_transaction.amount == incoming["amount"]
if sender_and_recipient_equal and signature_equal and amount_equal:
try:
self.open_transactions.remove(open_transaction)
except ValueError:
print("item already removed")
FileHandler.save_j_chain(self)
return True
def proof_of_work(self, hash_value):
nounce = 0
while not Verification.check_valid_proof(self.open_transactions, hash_value, nounce):
nounce += 1
return nounce