def add_block(self, block):
transactions = [
Transaction(tx['sender'], tx['recipient'], tx['signature'],
tx['amount']) for tx in block['transactions']
]
proof_is_valid = Verification.valid_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)
self.save_data()
stored_transactions = self.__open_transactions[:]
for itx 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')
return True
def proof_of_work():
last_block = blockchain[-1]
last_hash = hash_block(last_block)
proof = 0
verifier = Verification()
while not verifier.valid_proof(open_transactions, last_hash, proof):
proof += 1
return proof
def proof_of_work(self):
last_block = self.chain[-1]
last_hash = hash_block(last_block)
proof = 0
v = Verification()
while not v.valid_proof(self.open_transactions, last_hash, proof):
proof += 1
return proof
def proof_of_work(self):
last_block = self.__chain[-1]
last_hash = hash_util.hash_block(last_block)
proof = 0
while not Verification.valid_proof(self.__open_transactions, last_hash,
proof):
proof += 1
return proof
def proof_of_work(self):
"""Increment the proof number"""
last_block = self.chain[-1]
last_hash = hash_block(last_block)
proof = 0
verifier = Verification()
while not verifier.valid_proof(self.open_transactions, last_hash, proof):
proof += 1
return proof
def proof_of_work(self):
last_block = self.__chain[-1]
last_hash = hash_block(last_block)
proof = 0
while not Verification.valid_proof(self.__open_transaction, last_hash, proof):
proof += 1
# Printing the number of hashes done to check the proof.
print(proof)
return proof
def proof_of_work(self):
""" Initiates the proof of work function to allow mining """
last_block = self.__chain[-1]
last_hash = hash_block(last_block)
proof = 0
while not Verification.valid_proof(self.__open_transactions, last_hash,
proof):
proof += 1
return proof
def proof_of_work(self):
"""Generate a proof of work for the open transactions, the hash of the previous block and a random number (which is guessed until it fits)."""
last_block = self.__chain[-1]
last_hash = hash_block(last_block)
proof = 0
# Try different PoW numbers and return the first valid one
while not Verification.valid_proof(self.__open_transactions, last_hash,
proof):
proof += 1
return proof
def proof_of_work(self):
last_block = self.blockchain[-1]
last_hash = hash_block(last_block)
proof = 0
counter = 0
while not Verification.valid_proof(self.__open_transactions, last_hash,
proof):
proof += 1
counter += 1
print(counter)
return proof
