如何用web3.py生成智能合约collectFromTiles所需的v、r、s

• 初始化Web3连接
  连接到Polygon网络节点，代码示例：

  from web3 import Web3
  w3 = Web3(Web3.HTTPProvider("你的Polygon节点URL"))
  

• 定义EIP-712规范的Typed Data结构
  按照合约要求的签名数据格式，构造包含domain、types、value的字典：

  typed_data = {
      "domain": {
          "name": "合约名称",  # 需与合约中EIP712Domain的name一致
          "version": "合约版本",  # 需与合约中EIP712Domain的version一致
          "chainId": 137,  # Polygon主网链ID，测试网根据实际调整
          "verifyingContract": "0x068adc06faff086ee9ef826c0b83e7710e223c3d"  # 目标合约地址
      },
      "types": {
          "CollectFromTilesPermit": [  # 结构体名称需与合约中定义的一致
              {"name": "user", "type": "address"},
              {"name": "nonce", "type": "uint256"}
          ]
      },
      "primaryType": "CollectFromTilesPermit",
      "value": {
          "user": "用户钱包地址",
          "nonce": 0  # 后续从合约获取实际值
      }
  }
  

• 获取用户当前nonce
  调用合约的nonce方法获取用户对应的nonce值，更新到typed_data的value中：

  contract_address = "0x068adc06faff086ee9ef826c0b83e7710e223c3d"
  contract_abi = [{"constant": True, "inputs": [{"name": "", "type": "address"}], "name": "nonce", "outputs": [{"name": "", "type": "uint256"}], "payable": False, "stateMutability": "view", "type": "function"}]
  contract = w3.eth.contract(address=contract_address, abi=contract_abi)
  user_address = "用户钱包地址"
  typed_data["value"]["nonce"] = contract.functions.nonce(user_address).call()
  

• 生成签名(v/r/s)
  使用用户私钥对Typed Data进行签名，提取签名组件：

  user_private_key = "用户钱包私钥"
  signed_message = w3.eth.account.sign_typed_data(
      private_key=user_private_key,
      domain=typed_data["domain"],
      types=typed_data["types"],
      message=typed_data["value"]
  )
  # 提取v、r、s
  v = signed_message.v
  r = signed_message.r
  s = signed_message.s
  

• 签名验证（可选）
  验证生成的签名是否正确，确保后续交易不会因签名失败被合约拒绝：

  recovered_address = w3.eth.account.recover_typed_data(
      domain=typed_data["domain"],
      types=typed_data["types"],
      message=typed_data["value"],
      vrs=(v, r, s)
  )
  assert recovered_address.lower() == user_address.lower(), "签名验证失败"
  

内容的提问来源于stack exchange，提问作者Bui Tuan Huy