> ## Documentation Index
> Fetch the complete documentation index at: https://align.tolbel.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Sign Message

> Sign a raw message using the wallet's private key

## Method Signature

```typescript theme={null}
align.blockchain.wallets.signMessage(
  wallet: Wallet,
  message: string
): Promise<string>
```

## Parameters

<ParamField body="wallet" type="Wallet" required>
  The wallet to sign with (must have private key)
</ParamField>

<ParamField body="message" type="string" required>
  The message to sign
</ParamField>

## Returns

Returns the signature as a hex string (e.g., `"0x1234..."`).

## Examples

<Tabs>
  <Tab title="TypeScript">
    ```typescript theme={null}
    import Align from "@tolbel/align";

    const align = new Align({
      apiKey: process.env.ALIGN_API_KEY!,
      environment: "sandbox",
    });

    const wallet = await align.blockchain.wallets.create();

    // Sign a simple message
    const signature = await align.blockchain.wallets.signMessage(
      wallet,
      "Hello, World!"
    );

    console.log(`Signature: ${signature}`);
    ```
  </Tab>

  <Tab title="JavaScript">
    ```javascript theme={null}
    const signature = await align.blockchain.wallets.signMessage(
      wallet,
      "Hello, World!"
    );
    console.log("Signature:", signature);
    ```
  </Tab>
</Tabs>

### Proof of Ownership

```typescript theme={null}
// Create a timestamped ownership proof
const message = `I own this address. Timestamp: ${Date.now()}`;
const signature = await align.blockchain.wallets.signMessage(wallet, message);

// Send to server for verification
await fetch("/api/verify", {
  method: "POST",
  body: JSON.stringify({
    address: wallet.address,
    message,
    signature,
  }),
});
```

### Sign-In with Ethereum (SIWE)

```typescript theme={null}
const siweMessage = `example.com wants you to sign in with your Ethereum account:
${wallet.address}

Sign in to Example App

Nonce: ${nonce}`;

const signature = await align.blockchain.wallets.signMessage(
  wallet,
  siweMessage
);
```

<Warning>
  **Never sign messages from untrusted sources!** Signatures can authorize
  actions - always review what you're signing.
</Warning>

## Related Methods

<CardGroup cols={2}>
  <Card title="Sign Typed Data" icon="file-signature" href="/docs/api/blockchain/wallets/sign-typed-data">
    Sign EIP-712 data
  </Card>

  <Card title="Create Wallet" icon="wallet" href="/docs/api/blockchain/wallets/create">
    Create new wallet
  </Card>
</CardGroup>