# SignedMessageData

已签名消息数据结构。

## 字段说明

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

## 示例代码

```python
# 签名消息
message = "Hello, Ethereum!"
signed: SignedMessageData = account.sign_message_string(message)

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