Blockchain Security
Blockchain Infrastructure audits, Smart contract audits, protocol security reviews, and infrastructure assessments for the teams building critical systems. Two independent teams per engagement. Senior engineers armed with frontier AI. Flawless track record across 300+ engagements.
Hexens' blockchain security practice is where the mission-critical infrastructure comes when the technology is new, the margin for error is zero, and standard audit playbooks don't apply.
Every engagement runs two independent security teams in parallel. Each team is staffed by senior engineers - winners of 30+ international competitions, bug bounty leaderboard veterans, and published vulnerability researchers - doing rigorous manual review and directing frontier AI models as force multipliers. The models extend code coverage across massive codebases, surface non-obvious cross-contract interaction patterns, and generate adversarial test cases at a depth that simpler methodologies cannot reach. The engineer provides manual review, adversarial intuition, architectural judgment, and the creativity that no model can replicate. Together, they achieve audit depth that scales with complexity rather than being limited by it.
No parallel audits splitting attention. The teams work synergistically and converge. The overlap confirms coverage. The gaps reveal what a single-team and simpler methodology audit would have missed.
The result: $120B+ in protected digital assets. 300+ completed engagements. A zero-exploit track record.
Our engineers hold OSCP, OSWE, OSEP, OSED, OSMR, OSCE3, ISO27001 LA and CRTL certifications - and more importantly, they apply those skills in the context of blockchain-specific threat models that traditional pentesting firms don't understand.
[BLOCKCHAIN SECURITY]
[Fig. 01]
[01]
Operators
Who runs the 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.
[02]
Tooling
What they operate with
They are now armed with frontier-class models, the same class of technology that powers the systems they're testing, operating as force multipliers under their direction.
[03]
Method
How the two combine
The difference is not incremental. Senior engineers do rigorous manual review simultaneously, directing a frontier model to find the vulnerability that exists at the intersection of systems, and an assumption nobody documented.
[04]
Outcome
What it produces
Coverage that would take a team months is now coverable in a week - with deeper analysis, more adversarial test cases, and broader code path exploration than either could achieve alone.
Traditional Engagement
Months of team time
Hexens · AI-Augmented
One week end-to-end
Δ 01
Deeper analysis of individual findings
Δ 02
More adversarial test cases per surface
Δ 03
Broader code path exploration
This is not automation replacing judgment.
- It is the ceiling on what expert judgment can reach.
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.
Two teams. Frontier AI. Every engagement.
Each Hexens blockchain security audit deploys two independent security teams working the same codebase in parallel. Senior engineers only - no split attention, no concurrent projects. Each engineer directs frontier AI models to extend their reach: broader code coverage, deeper execution path analysis, more adversarial test cases, faster identification of patterns that span hundreds of functions or contracts.
The teams don't collaborate during the review. They converge at the end. Where findings overlap: confirmation. Where they don't: you've caught what one team alone would have missed.
- 90% of our reports contain critical or high-severity findings.
- 91% of clients return for additional engagements.
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[Fig. 02]
