signMessage

import { useAbstractClient } from "@abstract-foundation/agw-react";

export default function SignMessage() {
  const { data: agwClient } = useAbstractClient();

  async function signMessage() {
    if (!agwClient) return;

    // Alternatively, you can use Wagmi useSignMessage: https://wagmi.sh/react/api/hooks/useSignMessage
    const signature = await agwClient.signMessage({
      message: "Hello, Abstract!",
    });
  }
}

import { createPublicClient, http } from "viem";
import { abstractTestnet } from "viem/chains";

// Create a public client to verify the message
const publicClient = createPublicClient({
  chain: abstractTestnet,
  transport: http(),
});

// Verify the message
const isValid = await publicClient.verifyMessage({
  address: walletAddress, // The AGW address you expect to have signed the message
  message: "Hello, Abstract!",
  signature,
});