# sign\_typed\_message

对结构化消息数据进行 EIP-712 签名。

## 方法定义

```python
def sign_typed_message(self, domain_data: dict, message_types: dict, message_data: dict) -> Optional[SignedMessageData]
```

## 参数说明

| 参数             | 类型   | 说明       |
| -------------- | ---- | -------- |
| domain\_data   | dict | 域数据      |
| message\_types | dict | 消息类型定义   |
| message\_data  | dict | 待签名的消息数据 |

## 返回值

返回 SignedMessageData 对象,包含以下字段:

| 字段              | 类型              | 说明    |
| --------------- | --------------- | ----- |
| message\_hash   | HexBytes        | 消息哈希  |
| message         | str             | 原始消息  |
| signer          | ChecksumAddress | 签名者地址 |
| signature\_data | SignatureData   | 签名数据  |

SignatureData 包含以下字段:

| 字段        | 类型       | 说明     |
| --------- | -------- | ------ |
| signature | HexBytes | 完整签名   |
| r         | HexBytes | 签名 r 值 |
| s         | HexBytes | 签名 s 值 |
| v         | HexBytes | 签名 v 值 |

## 示例代码

```python
# EIP-712 结构化数据签名
domain_data = {
    "name": "MyDApp",
    "version": "1",
    "chainId": 1,
    "verifyingContract": "0x..."
}

message_types = {
    "Person": [
        {"name": "name", "type": "string"},
        {"name": "wallet", "type": "address"}
    ]
}

message_data = {
    "name": "Bob",
    "wallet": "0x..."
}

signed = account.sign_typed_message(domain_data, message_types, message_data)

if signed:
    print(f"Message Hash: {signed.message_hash.hex()}")
    print(f"Signer: {signed.signer}")
    print(f"Signature: {signed.signature_data.signature.hex()}")
```


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