区块链锻造怎么玩

import hashlib

def calculate_hash(block):
    """计算区块的哈希值"""
    block_string = f"{block['index']}{block['timestamp']}{block['data']}{block['previous_hash']}"
    return hashlib.sha256(block_string.encode()).hexdigest()

def is_valid_new_block(new_block, previous_block):
    """验证新区块的有效性"""
    if previous_block['index'] + 1 != new_block['index']:
        return False
    elif previous_block['hash'] != new_block['previous_hash']:
        return False
    elif calculate_hash(new_block) != new_block['hash']:
        return False
    return True

# 示例区块数据
new_block = {
    'index': 2,
    'timestamp': '2023-04-01 12:00:00',
    'data': 'Transaction Data',
    'previous_hash': '000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f',
    'hash': ''  # 待计算
}

# 计算新区块哈希并验证
new_block['hash'] = calculate_hash(new_block)
print(is_valid_new_block(new_block, previous_block))  # 输出验证结果