# webln.signMessage()

Request that the user signs an arbitrary string message. 

Signed messages can either be verified server-side using the LND RPC method, or by clients with [webln.verifyMessage](https://webln.dev/#/api/verify-message).

#### Method

```typescript
async function signMessage(message: string): SignMessageResponse;
```

#### Response

```typescript
interface SignMessageResponse {
  message: string;
  signature: string;
}
```

#### Code Example <a href="#demo" id="demo"></a>

```typescript
await webln.enable();
await webln.signMessage("Sample message"); 
```

#### Demo

{% embed url="<https://codepen.io/getalby/pen/eYyXQNQ>" %}

**Example in the wild**

<https://amboss.space/> uses `webln.signMessage()`for login. Users sign a message and prove ownership of a lightning node.

&#x20;<img src="/files/ISLoTIPjDhpBGNYxPuQj" alt="" data-size="original">


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://www.webln.guide/building-lightning-apps/webln-reference/webln.signmessage.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.