Verify Message signed by Account Abstraction / Smart Account [DFNS + ALCHEMY]

sign.mjs

import "dotenv/config";

import { DfnsWallet } from "@dfns/lib-viem";
import { DfnsApiClient } from "@dfns/sdk";
import { AsymmetricKeySigner } from "@dfns/sdk-keysigner";
import { LocalAccountSigner, polygonMumbai } from "@alchemy/aa-core";
import { createModularAccountAlchemyClient } from "@alchemy/aa-alchemy";
import { generatePrivateKey } from "viem/accounts" ;
import { createPublicClient, http } from "viem";

/**
 * Trying to sign a message with DFNS + Alchemy AA
 * and verify it with viem verifyMessage https://viem.sh/docs/actions/public/verifyMessage.html
 */

const keySigner = new AsymmetricKeySigner({
  credId: process.env.DFNS_CRED_ID,
  privateKey: process.env.DFNS_PEM,
  appOrigin: process.env.DFNS_APP_ORIGIN
});

const dfnsClient = new DfnsApiClient({
  baseUrl: process.env.DFNS_API_URL,
  appId: process.env.DFNS_APP_ID,
  authToken: process.env.DFNS_JWT_KEY,
  signer: keySigner
});

const dfnsWallet = await DfnsWallet.init({
  walletId: "wa-5ju0r-lhhbc-90uo2jlinjgve8o3",
  dfnsClient
});

const alchemyProvider = await createModularAccountAlchemyClient({
  apiKey: process.env.ALCHEMY_API_KEY,
  chain: polygonMumbai,
  signer: new LocalAccountSigner(dfnsWallet)
});

const publicClient = createPublicClient({
  chain: polygonMumbai,
  transport: http()
});

const message = "not random message";

const dfnsSignature = await alchemyProvider.signMessage({ message });

// is false / not valid
console.log(await publicClient.verifyMessage({
  address: alchemyProvider.getAddress(),
  message,
  signature: dfnsSignature
}));

/**
 * Signing the message with an Alchemy's LocalAccountSigner and a private key
 * and verifying it with viem verifyMessage https://viem.sh/docs/actions/public/verifyMessage.html
 */
const signer = LocalAccountSigner.privateKeyToAccountSigner(generatePrivateKey());

const signature = await signer.signMessage(message);

// is true / valid
const valid = await publicClient.verifyMessage({
  address: await signer.getAddress(),
  message,
  signature
});

console.log(valid);