signTypedData

signTypedData supports signing typed data from the LitSigner.

This method must be called after authenticate. Otherwise, this method will throw an error with the message Not Authenticated.

Usage

example.ts

import { createLitSignerWithAuthMethod } from "./lit";


const litSigner = new createLitSignerWithAuthMethod();

const signedTypedData = await litSigner.signTypedData({
  domain: {
    name: "Ether Mail",
    version: "1",
    chainId: 1,
    verifyingContract: "0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC",
  },
  types: {
    Person: [
      { name: "name", type: "string" },
      { name: "wallet", type: "address" },
    ],
    Mail: [
      { name: "from", type: "Person" },
      { name: "to", type: "Person" },
      { name: "contents", type: "string" },
    ],
  },
  primaryType: "Mail",
  message: {
    from: {
      name: "Cow",
      wallet: "0xCD2a3d9F938E13CD947Ec05AbC7FE734Df8DD826",
    },
    to: {
      name: "Bob",
      wallet: "0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB",
    },
    contents: "Hello, Bob!",
  },
});

lit.ts

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,
  });
};

Returns

Promise<Hex>

A Promise containing the signature of the typed data.

Parameters

params: SignTypedDataParams -- the typed data to sign

• domain: TypedDataDomain -- The typed data domain
• types: Object -- the type definitions for the typed data
• primaryType: inferred String -- the primary type to extract from types and use in value
• message: inferred from types & primaryType -- the message, inferred from type