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Overview

The Embedded Wallet Kit provides a simple way to sign messages and transactions in your React application. You can use Turnkey’s Embedded Wallets or an external wallet for signing.

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Signing messages

To sign messages, you can use the signMessage function from the useTurnkey hook. You can grab the wallet account you want to use from the wallets array in the useTurnkey hook. 
import { useTurnkey } from "@turnkey/react-wallet-kit";

function SignMessageButton() {
  const { signMessage, wallets } = useTurnkey();

  const doSignMessage = async () => {
    try {
      const walletAccount = wallets[0]?.accounts[0]; // Use the first account of the first wallet
      const message = "Hello, Turnkey!";

      const signature = await signMessage({
        walletAccount,
        message,
      });
      console.log("Message signed:", signature);
    } catch (error) {
      console.error("Error signing message:", error);
    }
  };

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

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With a modal

If you want to show a modal for signing messages, you can use the handleSignMessage function from the useTurnkey hook. This will automatically show a modal with the message to sign. 
import { useTurnkey } from "@turnkey/react-wallet-kit";

function SignMessageButton() {
  const { handleSignMessage, wallets } = useTurnkey();

  const doSignMessage = async () => {
    try {
      const walletAccount = wallets[0]?.accounts[0]; // Use the first account of the first wallet
      const message = "Hello, Turnkey!";

      const signature = await handleSignMessage({
        walletAccount,
        message,
      });
      console.log("Message signed:", signature);
    } catch (error) {
      console.error("Error signing message:", error);
    }
  };

  return <button onClick={doSignMessage}>Sign Message</button>;
}
You will see a modal with the message to sign, and the user can confirm the signature. Signing message modal

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Signing transactions

To sign transactions, you can use the signTransaction function from the useTurnkey hook. Similar to signing messages, you can grab the wallet account you want to use from the wallets array. 
import { useTurnkey } from "@turnkey/react-wallet-kit";

function SignTransactionButton() {
  const { signTransaction, wallets } = useTurnkey();

  const doSignTransaction = async () => {
    try {
      const walletAccount = wallets[0]?.accounts[0]; // Use the first account of the first wallet
      const unsignedTransaction = "0x..."; // Replace with your unsigned transaction data

      const signature = await signTransaction({
        walletAccount,
        unsignedTransaction,
        transactionType: "TRANSACTION_TYPE_ETHEREUM",
      });
      console.log("Transaction signed:", signature);
    } catch (error) {
      console.error("Error signing transaction:", error);
    }
  };

  return <button onClick={doSignTransaction}>Sign Transaction</button>;
}

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Using a linked external wallet

You can use external wallets like MetaMask to sign messages and transactions. The same signMessage, handleSignMessage or signTransaction functions can be used. You simply need to pass in the external wallet’s walletAccount object from the same wallets array. You can check if the wallet is an external wallet by checking the source property of the wallet object: 
import { useTurnkey, WalletSource } from "@turnkey/react-wallet-kit";

function SignMessageWithExternalWalletButton() {
  const { handleSignMessage, wallets } = useTurnkey();

  const doSignMessage = async () => {
    try {
      const externalWallet = wallets.find(
        (wallet) => wallet.source === WalletSource.Connected
      ); // Find an external wallet

      if (!externalWallet) {
        throw new Error("No external wallet found");
      }

      const walletAccount = externalWallet.accounts[0]; // Use the first account of the external wallet
      const message = "Hello, Turnkey!";

      const signature = await handleSignMessage({
        walletAccount,
        message,
        addEthereumPrefix: true, // Required for connected Ethereum wallets (e.g. MetaMask) 
      });
      console.log("Message signed with external wallet:", signature);
    } catch (error) {
      console.error("Error signing message with external wallet:", error);
    }
  };

  return (
    <button onClick={doSignMessage}>Sign Message with External Wallet</button>
  );
}
The user will be prompted by their external wallet to sign the message. Signing message with external wallet

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Next steps

Now that you know how to sign messages and transactions in your React application, checkout the UI Customization guide to learn how to customize the look and feel of the signing modals and other UI components.
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