区块链程序源码

class Block:
    def __init__(self, index, previous_hash, timestamp, data, hash):
        self.index = index
        self.previous_hash = previous_hash
        self.timestamp = timestamp
        self.data = data
        self.hash = hash

class Blockchain:
    def __init__(self):
        self.chain = [self.create_genesis_block()]

    def create_genesis_block(self):
        return Block(0, "0", int(time.time()), "Genesis Block", "0")

    def get_latest_block(self):
        return self.chain[-1]

    def add_block(self, new_block):
        new_block.previous_hash = self.get_latest_block().hash
        new_block.hash = self.calculate_hash(new_block)
        self.chain.append(new_block)

    def calculate_hash(self, block):
        value = str(block.index) + str(block.previous_hash) + str(block.timestamp) + str(block.data)
        return hashlib.sha256(value.encode('utf-8')).hexdigest()