EIP-7702 Delegation

EIP-7702 enhances Externally Owned Accounts (EOAs) by allowing them to perform smart contract-like operations. In this example, we show how to sign the eip7702Auth tuple in SimpleAccount to delegate the authorization to the smart account.

For the complete example on how to upgrade an EOA to a smart account, vist EIP-7702 Geting Started.

Setup

Install dependencies

npm i abstractionkit ethers

Initialize Smart Account

Simple7702Account is a fully audited minimalist smart contract account that can be safely authorized by any EOA. It adds full support for major smart account features like batching and gas sponsorship.

index.ts

import { Simple7702Account } from "abstractionkit";
import { Wallet } from "ethers";

const eoaDelegator = Wallet.createRandom();

const smartAccount = new Simple7702Account(eoaDelegator.address);

console.log("Account address(sender) : " + smartAccount.accountAddress);

Create UserOperation

Calling createUserOperation on Simple7702Account will:

1. Compute the r and s values for the eip7702Auth. These values are part of signature authorization tuple needed to upgrade the EOA. This is only used once, during the upgrade transaction of the EOA.
2. Determine the nonce and fetch the gas prices from the provided node rpc
3. Estimate gas limits from the provided bundler
4. Returns a unsigned user operation.

index.ts

const bundlerUrl = process.env.BUNDLER_URL as string;
const chainId = BigInt(process.env.CHAIN_ID as string);
const eoaDelegatorPrivateKey = eoaDelegator.privateKey;

let userOperation = await smartAccount.createUserOperation(
    [metaTransaction],
    jsonRpcNodeProvider,
    bundlerUrl,
    {
        eip7702Auth:{
            chainId, // chainId at which the account will be upgraded, which is needed in EIP-7702
        }
    }
);

Sign the Delegate Authorization

Sign the eip7702Auth tuple to delegate the authorization to the smart account. This is only called once, during the upgrade transaction of the EOA.

import { createAndSignEip7702DelegationAuthorization } from "abstractionkit";

userOperation.eip7702Auth = createAndSignEip7702DelegationAuthorization(
    BigInt(userOperation.eip7702Auth.chainId),
    userOperation.eip7702Auth.address,
    BigInt(userOperation.eip7702Auth.nonce),
    eoaDelegatorPrivateKey
);

In this guide, we've shown you what it needs to how upgrade an Externally Owned Account (EOA) by delegating its authorization to a designated smart contract address using EIP-7702. To run a complete example, visit EIP-7702 Geting Started.