eth_signTypedData_v4

const signTypedData = async () => {
  const address = "0xYourEthereumAddress";
   const msgParams = {
      domain: {
        chainId: 97, // Binance Smart Chain 测试网
        name: "Ether Mail",
        verifyingContract: "0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC",
        version: "1", // 版本应为字符串
      },
      message: {
        from: {
          name: 'Alice',
          wallet: "0x58F401144bbd45031b9937Ec93A8b2aac8bB8972" // 确保地址为小写
        },
        to: {
          name: 'Bob',
          wallet: '0x58F401144bbd45031b9937Ec93A8b2aac8bB8972' // 确保地址为小写
        },
        contents: 'Hello, Bob!'
      },
      primaryType: "Mail",
      types: {
        EIP712Domain: [
          { name: 'name', type: 'string' },
          { name: 'version', type: 'string' },
          { name: 'chainId', type: 'uint256' },
          { name: 'verifyingContract', type: 'address' }
        ],
        Person: [
          { name: 'name', type: 'string' },
          { name: 'wallet', type: 'address' }
        ],
        Mail: [
          { name: 'from', type: 'Person' },
          { name: 'to', type: 'Person' },
          { name: 'contents', type: 'string' }
        ]
      },
    };

  try {
    const signature = await window.ethereum.request({
    method: "eth_signTypedData_v4",
    params: [address, JSON.stringify(msgParams)],
  });

    console.log("签名结果:", signature);
  } catch (error) {
    console.log("签名失败:", error);
  }
};