Smart Wallet

Smart Wallet by Coinbase is a smart contract wallet implementation compliant with ERC-4337, designed to enhance wallet security and usability on Ethereum and compatible chains. It supports multiple concurrent owners, allowing each owner to transact independently without requiring approval from others. Owners can be either Ethereum addresses or passkey public keys (Secp256r1), enabling flexible authentication methods including WebAuthn-style passkeys. This wallet is built to support modern account abstraction standards, facilitating advanced user operations and signature schemes.

A key feature of Smart Wallet is its cross-chain replayability for owner updates and other actions. Users can sign a single user operation that can be replayed permissionlessly across multiple chains, ensuring consistent wallet state and ownership across ecosystems. This is enabled by a specialized function that bypasses chain ID validation for certain whitelisted calls, such as adding or removing owners and upgrading the wallet implementation. The wallet factory and implementation are deployed via the Safe Singleton Factory, which guarantees the same contract address across over 200 chains, simplifying multi-chain deployment.

Developers can integrate Smart Wallet by deploying the contracts on their target chains and using the provided interfaces to manage owners and execute transactions. The wallet supports both direct Ethereum address calls and ERC-4337 user operations with a custom signature wrapper to handle different owner types efficiently. The repository includes tests runnable with Foundry's Forge tool and deployment scripts that leverage environment variables for RPC URLs and account keys. This wallet is particularly suited for projects requiring multi-owner control, passkey authentication, and seamless multi-chain wallet management.