Blockchain Security
Where mission-critical infrastructure goes when the technology is new, the margin for error is zero, and standard audit playbooks don’t apply.
Blockchain code carries three properties no other software does. The patching after deployment is complicated or even impossible. Its execution is public and adversarial. And its economic logic is the attack surface. Our engagements are built around these realities.
[BLOCKCHAIN SECURITY]
[Fig. 01]
TEAM
Senior Researchers. Every Engagement.
Hexens security researchers are CTF champions, bug bounty leaderboard veterans, and engineers who’ve spent careers breaking systems that weren’t supposed to break.
No junior bench, no rotation, no learning on your codebase.
Credentials earned, not collected.
TOOLING
Security Engineers X Frontier AI
Rigorous, line-by-line review — extended by frontier AI as a force multiplier. The engineer brings the judgment. The model removes the ceiling on what that judgment can reach.
Deeper analysis of individual findings.
More adversarial test cases per surface.
Broader code path exploration.
METHOD
Two Independent Teams. In Parallel.
Two senior security teams run against the same target in parallel, pairing manual review with frontier AI as a force multiplier. Where findings overlap, you have confirmation. Where they diverge, you’ve caught what a single-team audit would have missed.
Beyond scope by default.
Engagements are exclusive.
Retesting, included.
OUTCOME
Findings that hold up to a post-mortem.
The audits that matter are the ones still defensible after something goes wrong. None of ours have been tested that way.
- $120 BLN+In digital assets protected
- Zeropost-audit exploits across 300+ engagements
- 91%client retention rate
- 90%of reports contain critical or high-severity findings
Coverage that neither security engineers nor frontier AI could deliver alone.
Smart Contract Audit
Line-by-line security review of smart contract code across Solidity, Rust, Move, Vyper, Cairo, etc. Every audit combines manual expert analysis with frontier AI models that accelerate pattern detection, cross-reference known vulnerability classes across deployed contract ecosystems, and surface subtle interaction paths that span multiple contracts. We assess business logic, access control, state management, economic attack vectors, gas optimization risks, and cross-contract interaction vulnerabilities.
L1/L2 Blockchain Security Review
Comprehensive security assessment of Layer 1 and Layer 2 blockchain protocols - consensus mechanisms, validator logic, bridging infrastructure, sequencer design, and execution environments. Our engineers use AI to model protocol state spaces, generate edge-case transaction sequences, and reason about emergent behaviors in complex distributed systems. Hexens have audited protocol architectures at the foundation layer, including novel designs where no prior audit methodology existed.
Centralized Exchange Security Assessment
Full-scope security assessment of centralized exchange infrastructure - trading engine logic, hot/cold wallet architecture, withdrawal flows, API security, order matching systems, and operational controls. Hexens brings the same adversarial rigor applied to DeFi protocols into the centralized exchange environment, with AI-augmented testing that covers the full attack surface from smart contract integrations to internal infrastructure and operational workflows.
Hardware and Software Wallet Audit
End-to-end security review of wallet implementations - key generation, storage, signing logic, secure element integration, transaction construction, and user-facing flows. We audit both hardware wallet firmware and software wallet applications, covering the full lifecycle from key creation to transaction broadcast.
DeFi Protocol Security Review
Security assessment of DeFi protocol design and implementation - lending markets, AMMs, yield aggregators, liquid staking, restaking, and derivative platforms. We evaluate economic attack vectors, oracle dependencies, governance manipulation risks, and cross-protocol interaction vulnerabilities specific to composable DeFi systems. Frontier AI models enable deeper analysis of complex economic attack paths - modeling flash loan sequences, cross-protocol composability risks, and oracle manipulation chains that involve multiple simultaneous interactions.
Bridge and Cross-Chain Security
Security review of cross-chain messaging protocols, bridge architectures, and interoperability layers. Bridge exploits have accounted for some of the largest losses in blockchain history. Hexens assess message verification logic, relayer trust assumptions, signature schemes, and the full cross-chain transaction lifecycle - with AI-augmented analysis of multi-chain state interactions and edge cases in asynchronous message passing.
Trusted Execution Environment (TEE) Application Review
Security assessment of blockchain applications leveraging trusted execution environments - Intel SGX, AMD SEV, ARM TrustZone, and TDX. We evaluate enclave design, attestation mechanisms, side-channel resistance, and the interaction between TEE-protected components and on-chain infrastructure. TEE security is critical for MEV protection, confidential transaction processing, oracle computation, and institutional key management.
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