Use the signMessage method exported from the useSignMessage hook to sign a message with a Solana wallet.
signMessage: ({
  message,
  options
}: {
  message: Uint8Array;
  wallet: ConnectedStandardSolanaWallet;
  options?: {
    uiOptions?: SignMessageModalUIOptions;
  };
}) =>
  Promise<{
    signature: Uint8Array;
  }>;

​
Usage

import {useWallets, useSignMessage} from '@privy-io/react-auth/solana';
import bs58 from 'bs58';

const {wallets} = useWallets();
const {signMessage} = useSignMessage();

const selectedWallet = wallets[0];

const message = 'Hello world';
const signatureUint8Array = (
  await signMessage({
    message: new TextEncoder().encode(message),
    wallet: selectedWallet,
    options: {
      uiOptions: {
        title: 'Sign this message'
      }
    }
  })
).signature;
const signature = bs58.encode(signatureUint8Array);

​
Parameters

​
message
Uint8Array
required
Message to be signed as a Uint8Array.
​
wallet
string
The Solana wallet to use for signing the message.
​
options
{uiOptions?: SignMessageModalUIOptions}
Additional options for signing the message.

​
Response

​
signature
Uint8Array
The signature produced by the wallet.
​
signedMessage
Uint8Array
The original message that was signed.