barz
Barz — Modular Smart Contract Wallet
A secure, modular, upgradeable ERC-4337 smart contract wallet built on the EIP-2535 Diamond, Multi-Facet Proxy standard. Each feature is an independent facet that can be attached or detached by the wallet owner.
Repo: github.com/trustwallet/barz
Architecture
Barz uses the Diamond proxy pattern — a single Barz.sol proxy that delegates calls to modular facets:
Barz (Diamond Proxy)
├── AccountFacet — execution, ERC-4337 validateUserOp
├── Secp256k1VerificationFacet — ECDSA (standard EOA-style signing)
├── Secp256r1VerificationFacet — P256 / Passkey (WebAuthn)
├── MultiSigFacet — multi-signature support
├── DiamondCutFacet — add/replace/remove facets
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