区块链信贷是什么

import hashlib

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

    def calculate_hash(self):
        sha = hashlib.sha256()
        hash_str = self.data + self.previous_hash
        sha.update(hash_str.encode('utf-8'))
        return sha.hexdigest()

class Blockchain:
    def __init__(self):
        self.chain = [Block("Genesis Block", "0")]

    def add_block(self, data):
        previous_hash = self.chain[-1].hash
        new_block = Block(data, previous_hash)
        self.chain.append(new_block)

# 模拟信贷信息存储
blockchain = Blockchain()
blockchain.add_block("User 1 credit application data")
blockchain.add_block("User 2 credit approval data")