供应链金融的公司

from hashlib import sha256
import json

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

    def calculate_hash(self):
        block_string = json.dumps(self.__dict__, sort_keys=True).encode()
        return sha256(block_string).hexdigest()

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

    def create_genesis_block(self):
        return Block(0, "01/01/2022", "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 = new_block.calculate_hash()
        self.chain.append(new_block)

# 示例交易数据
transaction_data = {
    "supplier": "ABC Corp",
    "buyer": "XYZ Inc",
    "amount": 100000,
    "date": "01/15/2023"
}

# 创建区块链并添加交易块
blockchain = Blockchain()
new_block = Block(len(blockchain.chain), "01/15/2023", transaction_data)
blockchain.add_block(new_block)

# 打印区块链
for block in blockchain.chain:
    print(f"Index: {block.index}")
    print(f"Timestamp: {block.timestamp}")
    print(f"Data: {block.data}")
    print(f"Hash: {block.hash}")
    print(f"Previous Hash: {block.previous_hash}\n")