Veil — Invisible Wallet

Veil is a passkey-powered smart wallet built on Stellar Soroban. It lets users register, authenticate, and authorize blockchain transactions using device biometrics — Face ID, fingerprint, or Windows Hello — with no seed phrases and no private key exposure.

Why Veil?

Core Concepts

• WebAuthn — A W3C standard that lets browsers create and use P-256 key pairs stored in hardware secure enclaves.
• Soroban Custom Account — A contract that implements __check_auth, called by the Soroban runtime for every transaction authorization.
• Challenge Binding — The Soroban signature_payload (32 bytes) is used directly as the WebAuthn challenge, binding the biometric signature to the exact transaction.
• P-256 ECDSA — The ES256 algorithm used by WebAuthn, verified on-chain using the p256 Rust crate.

Project Structure

invisible_wallet/
├── contracts/invisible_wallet/   # Rust/Soroban smart contract
│   └── src/
│       ├── lib.rs                # Entry points + __check_auth
│       ├── auth.rs               # WebAuthn ES256 verification
│       └── storage.rs            # Signer/guardian storage
└── sdk/
    └── src/
        ├── useInvisibleWallet.ts # React hook
        └── utils.ts              # Crypto utilities

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