Smart Wallet
An ERC-4337 compliant smart contract wallet supporting multiple owners, passkey and Ethereum address owners, with cross-chain replayability.
Overview
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.
The Problem
Managing wallet ownership and authentication across multiple chains is complex, especially when supporting both traditional Ethereum addresses and modern passkey signers. Existing wallets often lack flexible multi-owner support and cross-chain consistency for ownership updates.
The Solution
Key Features
ERC-4337 compliance
Implements the Ethereum account abstraction standard for flexible user operations and signature schemes.
SignatureWrapper struct for owner identification
Encodes owner index and signature data to optimize calldata and support different signature types.
Safe Singleton Factory deployment
Deploys wallet factory and implementation at the same address across 248 chains for consistent multi-chain support.
Key Strengths
How Developers Use Smart Wallet
Multi-owner DeFi vaults
DeFi projects can use Smart Wallet to create vaults controlled by multiple owners with independent transaction rights.
Cross-chain wallet management
Users can update wallet ownership once and have changes reflected across all supported chains automatically.
Passkey-based secure authentication
Applications can integrate passkey owners for passwordless, phishing-resistant wallet access alongside Ethereum addresses.
Works Well WithEVM Chains
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Pricing
Open Source | |
|---|---|
| Price (Monthly) | Free |
| Price (Annual) | Free |
| Messaging | N/A |
| Support | Community support via GitHub |
| Analytics |
Resources
The Smart Wallet repository provides comprehensive code, tests, and deployment instructions for an ERC-4337 compliant multi-owner smart contract wallet. It includes links to related standards and dependencies such as WebAuthn and Safe Singleton Factory.