The Protocol Defence bar
Three separate passes over the same codebase.
Two teams in parallel pressure the same scope at once. One team does expert manual review; the other spends billions of frontier-AI tokens. Under both, a full invariant suite keeps fuzzing, all three stack for the widest combined coverage.
Full-state fuzzing
Every reachable state, edge case, and regression
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Team A
Senior manual analysis
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Team B
Frontier AI — billions of tokens
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The codebase
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Coverage stacked together
Output is rewarded
Distinct coverage each team adds
Among the strongest in the field
Held as #1 in digital-asset security for five years.
Protocol Defence's commitment to high quality audits, keeping up with industry best practices and alignment between the reviewors and the protocol has led to them being a highly valuable partner in improving security of the protocol
We have used a mix of review shops before. Some were painful. Protocol Defence was a pleasure to work with.
10/10. They are among the strongest security minds in the space. This is how DeFi reviews should run.
The Protocol Defence team's eye for detail is excellent. We sleep better knowing they went through every part of the codebase with care.
10/10. Protocol Defence thoroughly reviewed our EVM implementation and found design flaws that AI agents barely catch.
A thorough review — that is the bar for bringing real-world assets onchain.
Protocol Defence showed professionalism and care that stood above the rest. They caught issues our other reviewers missed.
A strong experience with the team. Their professionalism, pace, and quality of work stood out.
After many reviews over many years, no one comes close to Protocol Defence's method, and the quality of the review stands apart.
Protocol Defence was an outstanding partner on our review. Each finding came with real detail and practical fixes. Strongly recommended.
Even on a very tight timeline, Protocol Defence was professional, fast, and thorough, and delivered strong work on time. The best team we have worked with.
When Cyfrin wants another review team, we pick Protocol Defence.
Our experience with Protocol Defence has been amazing. All security researchers on the team were exceptional at understanding all intricacies of the design and the team is well suited to audit any novel DeFi product that comes their way.
Our audit with Protocol Defence far exceeded expectations in terms of the number of vulnerabilities they were able to find and the level of service that they provided.
Protocol Defence has been an integral part of the growth of GMX and our ecosystem of protocols who also rely on them for audits. Having Protocol Defence as a strategic partner has allowed us to move more quickly while keeping security as our highest priority.
We very much appreciate Protocol Defence's approach to security and the entire review process. Protocol Defence goes further than required to not only do manual reviews but also contributes to verification processes.
10/10. Fast, thorough, and cost-effective.
You did excellent work here, as usual — we appreciate the effort so far.
Protocol Defence auditors conducted a remarkably thorough review. Their approach was well structured and we greatly appreciated the speed and professionalism of their feedback.
The Protocol Defence team is incredibly knowledgeable, thorough, and mindful. They caught issues that required extensive knowledge of dependencies.
My team and I have worked with many auditors in the past, including generally considered top tier firms. I can confidently say that we have never felt as secure as when working with Protocol Defence.
Protocol Defence brought rigorous security to our Bounce Tech smart contracts, finding edge cases and guiding fixes with clear communication.
Protocol Defence found a key bug earlier reviews had missed, even though it sat outside scope. That kind of extra care is rare.
Protocol Defence's work helped us not only better secure our smart contracts, but also refine specs and assumptions of the system overall.
Extremely proficient. I feel like they care about their contribution on a personal level. They are on a mission to become the best auditors out there. They don't need much guidance and understand the codebase quickly.
As a security audit company, Protocol Defence's approach to security and overall effectiveness is truly exceptional. Working with them has been a revelation – their auditors are among the best we've ever collaborated with.
Protocol Defence has an sharp eye for detail and goes further than required to ensure that the code is watertight. They are able to assess super advanced Solidity inline-assembly with ease.
Protocol Defence's thorough review process have left a strong impression on us. Their keen eye for detail and responsive support are qualities that shine through in every engagement.
Strong references. We compared public report findings with other reviewers on the same projects and Protocol Defence had the stronger set.
We cannot recommend Protocol Defence enough. The team is diligent, sharp, and a pleasure to work with.
We were impressed with Protocol Defence's overall approach to security, focus on tests, attention to detail and streamlined review process. We enjoyed working with them.
It is clear Protocol Defence is a team of strong professionals who care about the final outcome.
Strong team, strong work.
Protocol Defence's pragmatic and business-focused approach to security ensures that every insight is not only technically sound but directly useful for real-world decision-making.
In our previous engagements, the Protocol Defence team was extremely thorough. I also felt that the two-team approach would give a more in-depth coverage of our codebase.
Protocol Defence has been an excellent security partner through multiple audits. Their combination of great security researchers and custom fuzz testing is an incredibly strong approach to security. Highly recommend.
Our highest-tier review
Vanguard
A security review built for onchain teams under unusually high cyber pressure.
01
Two teams in parallel
Two independent teams hit the same protocol at once, each with a different method, so coverage is wider.
02
Frontier-AI sweep
Billions of tokens of frontier-model search across the codebase.
03
Full-state fuzzing
Invariant and property fuzzing across the whole state space.
04
$100,000 contest
A funded public contest tied to the quality of the review.
05
$50,000 bounty match
A hosted bounty with a match of up to $50,000.
06
Web2 surface
Close the usual 2026 exploit paths, with half the package cost returned as web2 credits.
07
Post-launch change review
Change review is included, so work after the review stays covered.
byProtocol Defence
What Protocol Defence covers
Cover every surface that can put the protocol at risk.
01
See audits
02
See OpSec
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See perimeter
04
See risk
05
Browse case studies
Audits & Pentests
In-depth protocol review, automated analysis, invariant fuzzing, manual research, and ship-ready fix support.
OpSec Audit
Key handling, access paths, team workflows, infrastructure exposure, and operational controls for teams that hold real value.
Perimeter Audit
Registrar and DNS control, a domain inventory, exposed services and hosts, and the delivery path people use to reach you.
Risk & Compliance
Independent technical risk review, control mapping, vendor diligence, and evidence ready for executives.
Case Studies
See how Protocol Defence has stood with protocol teams through launches, upgrades, incidents, and production hardening.
Begin now