Sign a message in Ethereum/EVM

React

import { useDynamicContext } from '@dynamic-labs/sdk-react-core';

const SignMessageButton = () => {
  const { primaryWallet } = useDynamicContext();

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

    const signature = await primaryWallet.signMessage('example');

    console.log('signature', signature);
  };

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

React Native

React Native

// Requires setting up the RN Viem extension
// See: /react-native/wallets/viem
import { dynamicClient } from '<path-to-your-dynamicClient>'; // extended with ViemExtension

export const signMessage = async () => {
  const wallet = dynamicClient.wallets.primary;
  if (!wallet) return;

  const walletClient = dynamicClient.viem.createWalletClient({ wallet });
  const signature = await walletClient.signMessage({ message: 'example' });
  console.log('signature', signature);
}

JavaScript SDK

Use the standalone client helpers to handle signing and preflight availability checks.

import {
  assertWalletAccountSigningAvailability,
  signMessage,
} from '@dynamic-labs-sdk/client';

export async function signWithClient(walletAccount, message) {
  await assertWalletAccountSigningAvailability({ walletAccount });
  const { signature } = await signMessage({ walletAccount, message });
  return signature;
}

If the wallet app needs the account to be active in its UI, the helpers throw WalletAccountNotSelectedError. Prompt the user to switch the active account in their wallet before retrying.

Flutter

Use dynamic_sdk_web3dart package for this

final response = await DynamicSDK.instance.wallets.signMessage(
        message: _controller.text,
        wallet: widget.wallet,
      );

Unity

void Awake(){
  DynamicSDKManager.Instance.OnMessageSigned += MessageSigned;
  DynamicSDKManager.Instance.SignMessage("Hello World");
}

void MessageSigned(string signedMessage)
{
  Debug.Log("Message Signed");
}