Formal Verification & Invariant Testing

Formal Verification & Invariant Testing

Shieldify offers formal verification and invariant-based testing as advanced security services for smart contracts, providing the highest levels of assurance beyond what manual review alone can achieve. These services are available as add-ons to Shieldify's subscription auditing model or as standalone engagements.

Formal Verification

Formal verification uses mathematical proofs to rigorously demonstrate that a smart contract behaves exactly as specified under all possible execution conditions. This service is particularly suited for:

• High-value DeFi protocols (lending, DEXes, derivatives) where mathematical correctness is critical
• Contracts managing large TVL where even small bugs can lead to catastrophic losses
• Protocols requiring regulatory or institutional-grade security assurance
• Complex state machines and cryptographic implementations

By combining formal verification with manual security review expertise, Shieldify provides a comprehensive security assurance stack that spans from human expert analysis to mathematical proof of correctness, aligned with the company's 6-layered security methodology.

Invariant Testing

Invariant testing defines and verifies properties that must always hold true for a protocol — for example, "total supply must equal the sum of all balances" — and then tests these invariants across a wide range of execution scenarios. Violations of invariants indicate deep logical vulnerabilities in the protocol's design, making this technique especially valuable for complex DeFi protocols with intricate economic and state machine logic.