供应链金融的意义

# 使用区块链技术记录供应链交易信息
import hashlib

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

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

# 创建区块链
blockchain = [Block(0, "", 0, "Genesis Block", calculate_hash(0, "", 0, "Genesis Block"))]

# 添加新区块
def add_block(data):
    previous_block = blockchain[-1]
    index = previous_block.index + 1
    timestamp = int(time.time())
    hash = calculate_hash(index, previous_block.hash, timestamp, data)
    new_block = Block(index, previous_block.hash, timestamp, data, hash)
    blockchain.append(new_block)

# 示例：记录一笔交易
add_block("Transaction: Supplier A to Manufacturer B for 1000 units of raw materials")