LitProtocol is distributed cryptography for signing, encryption, and compute. A generalizable key management network, Lit provides you with a set of tools for managing sovereign identities on the open Web.

Combining Lit Protocol's pkp wallet with Account Kit allows you to use your Programmable Key Pairs (PKPs) as a smart account for your users.

Install the pkp ethers package

npm i @lit-protocol/pkp-ethers@cayenne

Install the LitNodeClient

npm i @lit-protocol/lit-node-client@cayenne
npm i @lit-protocol/crypto@cayenne
npm i @lit-protocol/auth-helpers@cayenne

Creating PKP

First we will need a pkp with an AuthMethod See documentation here for creating PKPs

Create A LitSigner

import { polygonMumbai } from "@alchemy/aa-core";
import { LitAuthMethod, LitSigner } from "@alchemy/aa-signers/lit-protocol";
 
const API_KEY = "<YOUR API KEY>";
const POLYGON_MUMBAI_RPC_URL = `${polygonMumbai.rpcUrls.alchemy.http[0]}/${API_KEY}`;
const PKP_PUBLIC_KEY = "<YOUR PKP PUBLIC KEY>";
 
export const createLitSignerWithAuthMethod = async () => {
  return new LitSigner<LitAuthMethod>({
    pkpPublicKey: PKP_PUBLIC_KEY,
    rpcUrl: POLYGON_MUMBAI_RPC_URL,
  });
};

Use it with Modular Account

We can link our SmartAccountSigner to a Modular Account using createModularAccountAlchemyClient from aa-alchemy:

import { createModularAccountAlchemyClient } from "@alchemy/aa-alchemy";
import { sepolia } from "@alchemy/aa-core";
import { createLitSigner } from "./lit";
const chain = sepolia;
 
const provider = await createModularAccountAlchemyClient({
  apiKey: "ALCHEMY_API_KEY",
  chain,
  signer: await createLitSigner(AUTH_METHOD),
});