VaultChain Smart Contract Security Assessment

Reviewed core Vault.sol, ThresholdManager.sol, and MPCCoordinator.sol contracts. No reentrancy vulnerabilities. Threshold escalation correctly implements time-locks. MPC key share rotation handled securely. Minor suggestion: add gas limits on external calls in VaultProxy.sol. Access control uses OpenZeppelin Ownable2Step. Well-architected with defense-in-depth. Recommend formal verification for threshold signature logic.