Clear DefinitionsAccount Abstraction
Account abstraction is like allowing users to define their own bank account rules (e.g., daily limits, multi‑approval) instead of fixed bank policies.
Account abstraction improves wallet flexibility through:
Smart‑contract accounts: EOAs replaced by contracts with custom `validateUserOp`.
Meta‑transactions: Third‑party pays gas on behalf of user.
Custom verification: Multi‑factor, social recovery built‑in.
Unified UX: Abstracts gas tokens, enables pay‑masters.
An ERC‑4337 wallet contract lets a user submit a signed payload; a bundler executes it and receives payment in stablecoin via a paymaster contract.
ERC‑4337 defines `UserOperation` struct processed by EntryPoint contract. Wallet implements `validateUserOp` to check signatures or social recovery. Bundlers aggregate ops, call `handleOps`, and distribute gas fees per paymaster logic.
Complex validation logic expands attack surface; ensure thorough testing of `validateUserOp`.
Requires supporting infrastructure (bundlers, entry point) not yet universal.