Auth-Governed Secure Vault
Off-Chain EIP-712 ECDSA Authorized Vault Protocol
A cryptographic custody vault requiring cryptographic authorizations signed by a designated security signer before executing capital disbursements. Ideal for high-value operations requiring off-chain compliance or multi-party approvals.
The Engineering Problem
Smart contract vaults relying solely on msg.sender or simple access modifiers are vulnerable to compromised private keys, phishing transactions, and reentrancy loops.
EIP-712 Typed Signature Verification & Nonce Accounting
Validates structured off-chain permits against an immutable domain separator before updating internal accounting.
SecureVault.sol: Holds ETH reserves and executes payouts only upon valid signature submission.
AuthorizationManager.sol: Verifies ECDSA recovered addresses match active authorized signer keys.
Monotonic Nonce Mapping: Tracks and invalidates used nonces to permanently prevent transaction replay attacks.
Technical Challenges & Mitigations
Signature Malleability in ecrecover
Utilized OpenZeppelin ECDSA library to strictly reject signatures with non-standard s-values (preventing s-malleability exploits).
Cross-Contract Reentrancy Safeguards
Maintained strict CEI ordering and nullified user allowances prior to invoking low-level .call{value: amount} transfers.