FYEO Blockchain Security Audit is a professional security auditing service targeting blockchain protocols, smart contracts, and decentralized finance (DeFi) systems. The service is delivered by senior cryptographers and engineers who conduct line-by-line code reviews to identify vulnerabilities in blockchain and distributed ledger implementations. The service covers four primary areas: **Code Reviews:** Comprehensive analysis of code, logic, and functionality for cryptographic or ledger-based implementations. Senior engineers test systems for potential vulnerabilities across the full codebase. **Custom Fuzz Testing:** FYEO builds bespoke fuzzing harnesses tailored to a protocol's specific logic. These harnesses extend static analysis with dynamic, stateful verification, tracking shadow state, validating invariants, and exercising critical paths across Layer-1 protocols, smart-contract frameworks, and DeFi mechanisms such as AMMs, lending markets, governance modules, and bridges. **Advisory:** Researchers provide design and architecture guidance for blockchain solutions, drawing on security expertise to assist teams building on blockchain and distributed ledger technology. **Architecture and Development:** Full-stack development services including architecture design, documentation, code generation, and operational oversight. Clients receive real-time updates throughout the auditing process. The service supports multiple blockchain ecosystems including Ethereum, Solana, Polkadot, NEAR, Flare, Sui, and Aptos. Public audit reports are made available via a GitHub repository.