供应链金融的特征

import hashlib
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)
        return hashlib.sha256(block_string.encode()).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)

# 示例数据
data = {
    "supplier": "Supplier A",
    "buyer": "Buyer B",
    "amount": 100000,
    "status": "Paid"
}

# 创建区块链并添加区块
blockchain = Blockchain()
new_block = Block(len(blockchain.chain), "02/01/2022", data, "")
blockchain.add_block(new_block)

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