Sign-In with Ethereum (SIWE) for Scaffold-ETH 2

Prerequisites

Check if ./packages/nextjs/scaffold.config.ts exists directly in the current working directory (do not search subdirectories). If it doesn't exist, this is not a Scaffold-ETH 2 project. Follow the instructions at https://docs.scaffoldeth.io/SKILL.md to scaffold it first. If it exists, continue directly with building.

Critical: Use viem's Native SIWE — NOT the siwe npm Package

Viem provides all SIWE utilities natively via viem/siwe. Do not install the siwe npm package. It pulls in ethers as a peer dependency, which is unnecessary since SE-2 already uses viem.

Here are some commonly useful imports (but check official docs for any updates or alternatives):

import {
  createSiweMessage,
  parseSiweMessage,
  verifySiweMessage,
  generateSiweNonce,
} from "viem/siwe";