# Sign a message

### Example

`signMessage` function takes 2 parameters: first parameter as message to be signed and second parameter as WIF of specific wallet address. Second parameter can also be object that contains binary  `privateKey` or `wif` string and boolean testnet switch.

Documentation how to generate WIF can be found [o](https://obytejs.com/utils/generate-wallet)n [Generate a random address](https://obytejs.com/utils/generate-wallet) page.

```javascript
const { signMessage } = require('obyte/lib/utils');
const privateKey = window.atob('base64 of private key'); // convert to binary
const address_wif = 'wif string';
//const address_key = { privateKey, testnet: false }; // optional way
//const address_key = { wif: address_wif, testnet: false }; // optional way
const address_key = wallet_wif;
const message = 'Hello world';

const objSignedMessage = signMessage(message, address_key);
const signedMessageBase64 = window.btoa(JSON.stringify(objSignedMessage));

console.log(objSignedMessage, signedMessageBase64);
```

### **Returns**

```javascript
{
  authors: [
    {
      address: 'TMWNLXR42CKIP4A774BQGNVBZAPHY7GH',
      definition: [
        'sig',
        {
          pubkey: 'AsD2GQ3+CSHfFO9CfX8+gBxmxSm9TGweKjWVie0rt/0p'
        }
      ],
      authentifiers: {
        r: 'Xfw43Kiu+q+L/1b+z+daKe784V3KcvxWXedwcyC/Yvp+ziR1Jomo7Og7ZoPUPUwQeM4UPpIVU/cTtgurH0LzvA=='
      }
    }
  ],
  signed_message: 'Hello world',
  version: '3.0'
}

"eyJ2ZXJzaW9uIjoiMy4wIiwic2lnbmVkX21lc3NhZ2UiOiJIZWxsbyB3b3JsZCIsImF1dGhvcnMiOlt7ImFkZHJlc3MiOiJUTVdOTFhSNDJDS0lQNEE3NzRCUUdOVkJaQVBIWTdHSCIsImRlZmluaXRpb24iOlsic2lnIix7InB1YmtleSI6IkFzRDJHUTMrQ1NIZkZPOUNmWDgrZ0J4bXhTbTlUR3dlS2pXVmllMHJ0LzBwIn1dLCJhdXRoZW50aWZpZXJzIjp7InIiOiJYZnc0M0tpdStxK0wvMWIreitkYUtlNzg0VjNLY3Z4V1hlZHdjeUMvWXZwK3ppUjFKb21vN09nN1pvUFVQVXdRZU00VVBwSVZVL2NUdGd1ckgwTHp2QT09In19XX0="
```