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

# Sign a message

> Request EVM message signatures from users through Phantom using personal_sign for address verification.

When a web application is connected to Phantom, it can also request that the user signs a given message. Applications are free to write their own messages which will be displayed to users from within Phantom's signature prompt. Message signatures do not involve network fees and are a convenient way for apps to verify ownership of an address. To learn how you can use libraries such as [ethers.js](https://docs.ethers.org/v5/) to abstract away some of these intricacies, see [handleSignMessage](https://github.com/phantom-labs/eth_sandbox/blob/main/src/App.tsx#L193-L211) in our sandbox.

```javascript theme={null}
const message = 'To avoid digital dognappers, sign below to authenticate with CryptoCorgis.';
const from = accounts[0];
const msg = `0x${Buffer.from(message, 'utf8').toString('hex')}`;
const sign = await provider.request({
        method: 'personal_sign',
        params: [msg, from, 'Example password'],
    });
```

## Support for "Sign-In with" standards

Applications that rely on signing messages to authenticate users can choose to opt-in to one of the various "Sign-In with" (SIW) standards. For more details, see [Sign-In with (SIW) standards](../developer-powertools/signing-a-message).