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

# Sign Messages with Sui Libraries

> Sign a personal message for verification using the Sui SDK with Para

export const Card = ({imgUrl, title, description, href, horizontal = false, newTab = false}) => {
  const [isHovered, setIsHovered] = useState(false);
  const handleClick = e => {
    e.preventDefault();
    if (newTab) {
      window.open(href, '_blank', 'noopener,noreferrer');
    } else {
      window.location.href = href;
    }
  };
  return <div className={`not-prose relative my-2 p-[1px] rounded-xl transition-all duration-300 ${isHovered ? 'bg-gradient-to-r from-[#FF4E00] to-[#874AE3]' : 'bg-gray-200'}`} onMouseEnter={() => setIsHovered(true)} onMouseLeave={() => setIsHovered(false)}>
      <a href={href} onClick={handleClick} className={`not-prose flex ${horizontal ? 'flex-row' : 'flex-col'} font-normal h-full bg-white overflow-hidden w-full cursor-pointer rounded-[11px] no-underline`}>
        {imgUrl && <div className={`relative overflow-hidden flex-shrink-0 ${horizontal ? 'w-[30%] rounded-l-[11px]' : 'w-full'}`} onClick={e => e.stopPropagation()}>
            <img src={imgUrl} alt={title} className="w-full h-full object-cover pointer-events-none select-none" draggable="false" />
            <div className="absolute inset-0 pointer-events-none" />
          </div>}
        <div className={`flex-grow px-6 py-5 ${horizontal ? 'w-[70%]' : 'w-full'} flex flex-col ${horizontal && imgUrl ? 'justify-center' : 'justify-start'}`}>
          {title && <h2 className="font-semibold text-base text-gray-800 m-0">{title}</h2>}
          {description && <div className={`font-normal text-gray-500 re leading-6 ${horizontal || !imgUrl ? 'mt-0' : 'mt-1'}`}>
              <p className="m-0 text-xs">{description}</p>
            </div>}
        </div>
      </a>
    </div>;
};

Sign a Sui personal message to prove ownership of a Sui address without submitting a transaction. This is useful for authentication and off-chain verification.

<Card title="Setup Sui Libraries First" description="You must complete the Sui library setup before signing messages" href="/v3/react/guides/web3-operations/sui/setup-libraries" horizontal />

## Sign a Personal Message

The signer follows the Sui [personal message](https://docs.sui.io/concepts/cryptography/transaction-auth/signatures) standard: the message is wrapped in the `PersonalMessage` intent and hashed with blake2b before signing. `signPersonalMessage` returns the serialized signature.

```typescript theme={null}
import { useParaSuiSigner } from "@getpara/react-sdk";

function SignMessage() {
  const { suiSigner } = useParaSuiSigner();

  const signMessage = async () => {
    if (!suiSigner) return;

    const message = new TextEncoder().encode("Hello, Sui!");
    const { signature } = await suiSigner.signPersonalMessage(message);

    console.log("Address:", suiSigner.address);
    console.log("Signature:", signature);
  };

  return <button onClick={signMessage}>Sign Message</button>;
}
```

<Note>
  The returned `signature` is the serialized Sui signature (`base64(flag || signature || publicKey)`). Verify it with the signer's public key — see [Verify Signatures](/v3/react/guides/web3-operations/sui/verify-signatures).
</Note>

## Next Steps

<CardGroup cols={3}>
  <Card title="Verify Signatures" description="Verify signed messages" href="/v3/react/guides/web3-operations/sui/verify-signatures" icon="shield-check" />

  <Card title="Execute Transactions" description="Build, sign, and submit Sui transactions" href="/v3/react/guides/web3-operations/sui/execute-transactions" icon="bolt" />

  <Card title="Multisig" description="Sign as a member of a Sui multisig" href="/v3/react/guides/web3-operations/sui/multisig" icon="users" />
</CardGroup>