Building a smart wallet from scratch is one of the best ways to understand account abstraction. You do not need to build a production wallet first. A minimal project can teach the core pieces: account contracts, validation, execution, factories, UserOperations, EntryPoint, bundlers, and paymasters.

The first component is the smart account contract. This is the user's wallet logic. It defines who can authorize actions, how signatures are checked, and how transactions are executed. In a minimal version, the account may have one owner and a simple signature validation function.

The second component is execution logic. A wallet must be able to call another contract or send value. In a traditional EOA, the account directly signs and sends a transaction. In a smart wallet, the account contract receives an instruction and executes it if validation passes.

The third component is the EntryPoint. ERC-4337 uses an EntryPoint contract to validate and execute UserOperations. Bundlers submit operations to this contract, which coordinates the process.

The fourth component is a Factory contract. Users do not want to deploy wallet contracts manually. A Factory can create new smart accounts, often using deterministic addresses. This allows an account address to be known before the account is fully deployed.

The fifth component is the bundler. In a development environment, you can use existing bundler infrastructure instead of building one yourself. The bundler collects UserOperations and submits them through the EntryPoint.

The sixth component is the paymaster, although it can be optional in a first version. A paymaster enables gas sponsorship or alternative fee logic. This is one of the features that makes smart wallets feel dramatically better for users.

A minimal smart wallet should support three basic flows: deploy account, validate UserOperation, and execute a target call. Once that works, developers can add batching, session keys, recovery, spending limits, or ERC-20 gas payment.

For production, security becomes much more serious. Signature schemes, replay protection, nonce handling, upgrade control, and permission modules must be reviewed carefully. A demo wallet is a learning tool, not something to hold real assets.

The best first smart wallet project is small. Build only enough to understand the system. Once the relationship between account, factory, bundler, EntryPoint, and paymaster is clear, the rest of account abstraction becomes easier to reason about.