def addBlock(self, block):
transactions = [
Transaction(tx['copyrightOwner'], tx['picUrl'], tx['signature'],
tx['picPhash']) for tx in block['transactions']
]
proofIsValid = Verification.validProof(transactions,
block['previousHash'],
block['proof'])
hashesMatch = hashBlock(self.__chain[-1]) == block['previousHash']
print proofIsValid
print hashesMatch
if not proofIsValid or not hashesMatch:
return False
convertedBlock = Block(block['index'], block['previousHash'],
transactions, block['proof'],
block['timestamp'])
self.__chain.append(convertedBlock)
storedTransactions = self.__openTransactions[:]
for itx in block['transactions']:
for opentx in storedTransactions:
if opentx.copyrightOwner == itx['copyrightOwner'] and \
opentx.picUrl == itx['picUrl'] and \
opentx.picPhash == itx['picPhash'] and opentx.signature == itx['signature']:
try:
self.__openTransactions.remove(opentx)
except ValueError:
print('事务已被移除')
self.saveData()
return True
class Blockchain:
def __init__(self):
genesis_block = Block(0, '', [], 0, 0)
self.chain = [genesis_block]
self.unconfirmedTransaction = []
@property
def chain(self):
return self.__chain[:]
# The setter
@chain.setter
def chain(self, data):
self.__chain = data
def proofOfWork(self):
"""proof of work:
for adding the unconfirmed transactions,
hashing the previous block and guessing a proof number """
last_block = self.__chain[-1]
lastHash = hashBlock(last_block)
proof = 0
while not Verification.validProof(self.unconfirmedTransaction, lastHash, proof):
proof += 1
return proof
def proofOfWork(self):
"""proof of work:
the unconfirmed transactions, the hash of the previous block and a proof guessed number """
last_block = self.__chain[-1]
lastHash = hashBlock(last_block)
proof = 0
# Try different PoW numbers and return the first valid one
while not Verification.validProof(self.unconfirmedTransaction,
lastHash, proof):
proof += 1
return proof
def proofOfWork(self):
"""
工作量证明
为返回一个Nouse使当区块hash之后前三位为0
"""
lastBlock = self.__chain[-1]
lastHash = hashBlock(lastBlock)
proof = 0
while not Verification.validProof(self.__openTransactions, lastHash,
proof):
proof += 1
print('proof = ' + str(proof))
return proof