Account Abstraction
Understanding Account Abstraction (ERC-4337) in AAStar SDK.
What is Account Abstraction?
Account Abstraction (AA) allows users to use smart contract wallets instead of traditional Externally Owned Accounts (EOAs). This enables advanced features like:
- Gasless Transactions: Users don't need ETH for gas
- Social Recovery: Recover accounts without seed phrases
- Session Keys: Temporary permissions for DApps
- Batch Transactions: Multiple operations in one transaction
- Custom Validation: Flexible signature schemes
ERC-4337 Overview
ERC-4337 is the standard for Account Abstraction. Key components:
UserOperation
A pseudo-transaction object that represents a user's intent:
typescript
interface UserOperation {
sender: Address; // Smart account address
nonce: bigint; // Anti-replay protection
callData: Hex; // Actual transaction data
paymasterAndData: Hex; // Paymaster info (for gasless tx)
signature: Hex; // User signature
// ... gas fields
}EntryPoint
The singleton contract that processes UserOperations.
Bundler
Off-chain service that bundles UserOperations and submits them to the EntryPoint.
Paymaster
Contract that sponsors gas fees for users.
AAStar Implementation
AAStar SDK provides a complete AA infrastructure:
Smart Accounts
typescript
import { createSmartAccount } from '@aastar/account';
const account = await createSmartAccount({
owner: ownerAddress,
salt: 0n,
factoryAddress: CONTRACTS.sepolia.simpleAccountFactory,
});Gasless Transactions
typescript
import { createEndUserClient } from '@aastar/core';
const user = createEndUserClient({...});
// Check eligibility
const eligible = await user.checkEligibility(communityAddress);
if (eligible) {
// Send gasless transaction
await sendGaslessTransaction();
}Benefits
- Better UX: Users don't need to understand gas or hold ETH
- Security: Smart contract wallets are more secure than EOAs
- Flexibility: Custom validation logic and recovery mechanisms
- Programmability: Wallets can have complex logic