This example demonstrates how to implement EIP-1271 message signing and verification with Abstract Global Wallet inside a Next.js application.

• Connect with Abstract Global Wallet
• Sign messages with your wallet
• Verification of signatures using EIP-1271 standard

1. Get a copy of the example:

   mkdir -p agw-signing-messages && curl -L https://codeload.github.com/Abstract-Foundation/examples/tar.gz/main | tar -xz --strip=2 -C agw-signing-messages examples-main/agw-signing-messages && cd agw-signing-messages

2. Install dependencies

   npm install

3. Run the development server

   npm run dev

Visit http://localhost:3000 to see the app.

1. Frontend (/src/components/wallet/SignMessage.tsx):

   • Allows users to input a custom message
   • Signs the message using the connected AGW
   • Automatically verifies the signature

2. Backend (/src/app/api/verify-message/route.ts):

   • Provides an API endpoint for verifying signatures
   • Uses viem's verifyMessage function which supports EIP-1271
   • Works with both regular EOA wallets and Smart Contract wallets

This implementation leverages the EIP-1271 standard which allows smart contract wallets to verify signatures. When verifying a signature:

• For EOAs: Recovers the address from the signature and compares it
• For Smart Contract Wallets: Calls the wallet's isValidSignature method

• EIP-1271 Standard
• Viem Documentation
• Abstract Docs
• Official Site
• GitHub
• X
• Discord