Sign a message

signMessage: (message: Uint8Array) => Promise<Uint8Array>;

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

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

const message = 'Hello world';
const signatureUint8Array = await signMessage({
  message: new TextEncoder().encode(message),
  // Optional: Specify the wallet to use for signing. If not provided, the first wallet will be used.
  options: {
    address: wallets[0].address
  }
});
const signature = bs58.encode(signatureUint8Array);

import {useEmbeddedSolanaWallet} from '@privy-io/expo';

const wallet = useEmbeddedSolanaWallet();
const provider = await wallet.getProvider();

const message = 'Hello world';
const {signature} = await provider.request({
  method: 'signMessage',
  params: {message}
});

guard let user = privy.user else {
    // If user is null, user is not authenticated
    return
}

// Retrieve list of user's embedded Solana wallets
let solanaWallets = user.embeddedSolanaWallets

// Grab the desired wallet. Here, we retrieve the first wallet
guard let wallet = solanaWallets.first else {
    // No SOL wallets
    return
}

// Sign a Base64 encoded message
let signature = try await wallet.provider.signMessage(message: "SGVsbG8hIEkgYW0gdGhlIGJhc2U2NCBlbmNvZGVkIG1lc3NhZ2UgdG8gYmUgc2lnbmVkLg==")

print("Result signature: \(signature)")

// Get current auth state
val user = privy.user

// check if user is authenticated
if (user != null) {
    // Retrieve list of user's Solana wallet
    val solanaWallet = user.embeddedSolanaWallets.first()

    if (solanaWallet != null) {
        // Sign a message
        val result = solanaWallet.provider.signMessage("SGVsbG8hIEkgYW0gdGhlIGJhc2U2NCBlbmNvZGVkIG1lc3NhZ2UgdG8gYmUgc2lnbmVkLg==")
    }
}

try {
    IEmbeddedSolanaWallet embeddedWallet = PrivyManager.Instance.User.EmbeddedSolanaWallets[0];
    IEmbeddedSolanaWalletProvider provider = embeddedWallet.EmbeddedSolanaWalletProvider;
    string signature = await provider.SignMessage("A message to sign");
    Debug.Log(signature);
} catch (PrivyException.EmbeddedWalletException ex){
    Debug.LogError($"Could not sign message due to error: {ex.Error} {ex.Message}");
} catch (Exception ex) {
    Debug.LogError($"Could not sign message exception {ex.Message}");
}

// Get the current user
final user = privy.user;

// Check if the user is authenticated
if (user != null) {
  // Retrieve the user's Solana wallet
  final solanaWallet = user.embeddedSolanaWallets.first;

  if (solanaWallet != null) {
    // Sign a message
    final result = solanaWallet.provider.signMessage("SGVsbG8hIEkgYW0gdGhlIGJhc2U2NCBlbmNvZGVkIG1lc3NhZ2UgdG8gYmUgc2lnbmVkLg==")
  }
}

signMessage: (message: string, options: {uiOptions: SignMessageModalUIOptions; address?: string}) =>
  Promise<{signature: string}>;

const {signature, encoding} = await privy.walletApi.solana.signMessage({
  walletId: 'insert-wallet-id',
  message: 'Hello world'
});

https://api.privy.io/v1/wallets/<wallet_id>/rpc

$ curl --request POST https://api.privy.io/v1/wallets/<wallet_id>/rpc \
-u "<your-privy-app-id>:<your-privy-app-secret>" \
-H "privy-app-id: <your-privy-app-id>" \
-H "privy-authorization-signature: <authorization-signature-for-request>" \
-H 'Content-Type: application/json' \
-d '{
  "chain_type": "solana",
  "method": "signMessage",
  "params": {
    "message": "Hello, Solana.",
    "encoding": "base64"
  }
}'