> For the complete documentation index, see [llms.txt](https://sdk.venly.io/sdk-reference/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sdk.venly.io/sdk-reference/ue5-sdk-v3/function-references/wallet/signatures/createsignature.md).

# CreateSignature

Creates and optionally executes cryptographic signatures for blockchain messages and structured data.

**Supported signature types:**

* **Message signing**:\ Plain text message signing using personal\_sign method
* **EIP-712**:\ Ethereum typed structured data signing for improved security and usability

{% code overflow="wrap" %}

```cpp
void CreateSignature(const FVyUserAuth& SigningMethod, const FVyCreateSignatureRequest& Params, const FVyOnCreateSignatureComplete& OnComplete) const;
```

{% endcode %}

\
**Parameters**

| SigningMethod | FVyUserAuth                                                                                                  | The Id and Value of one of the user's registered signing-methods                        |
| ------------- | ------------------------------------------------------------------------------------------------------------ | --------------------------------------------------------------------------------------- |
| Params        | [FVyCreateSignatureRequest](/sdk-reference/ue5-sdk-v3/object-references/wallet/fvycreatesignaturerequest.md) | Parameters for this operation (FVyCreateSignatureRequest)                               |
| OnComplete    | FVyOnCreateSignatureComplete                                                                                 | The callback function called when the user preferences retrieval operation is complete. |

\
**OnComplete Callback** (FVyOnCreateSignatureComplete)\
Contains a [FVyCreateSignatureOneOf](/sdk-reference/ue5-sdk-v3/object-references/wallet/fvycreatesignatureoneof.md) response type