INDEPENDENT SECURITY COMPANY
We review smart contracts and critical digital asset infrastructure — from DeFi protocols to the systems that sign, move and protect value.
01 / EXPERTISE
For infrastructure teams, digital asset businesses and DeFi builders bringing critical systems into production.
INFRASTRUCTURE SECURITY
Independent reviews of signing, key management and the integrations your financial infrastructure relies on.
SMART CONTRACT SECURITY
Security audits for DeFi protocols and onchain applications, with findings your engineers can act on.
Share your architecture or planned release. We’ll help define the right review scope.
Start a conversation ↗02 / SELECTED WORK
Explore published reports and confirmations from the teams whose systems we reviewed.
KEY MANAGEMENT / CANTON
Security review of the KMS driver connecting Canton infrastructure with external key management.
Null Return
SMART CONTRACT SECURITY REVIEWSmart Contract AuditDeFi application securityJUNE 2025SECURITY REVIEWSMART CONTRACTS / DEFI
Review of DeFi smart contracts, with a public audit report and client confirmation.
Null Return
PROTOCOL SECURITY REVIEWProtocol Security AuditSmart contract reviewJANUARY 2026SECURITY REVIEWSMART CONTRACTS / DEFI
Review of protocol smart contracts, with a public audit report and client confirmation.
Every audit covers a defined scope and version. Refer to the report for its boundaries and findings.
03 / TESTIMONIALS & CLIENT CONFIRMATIONS
Client feedback, alongside public audit
announcements from the teams we work with.
CLIENT TESTIMONIAL / DZAP
“We’d like to recommend the team at Null Return as a professional and experienced audit partner. What stood out to us was their thorough, in-depth approach — they took the time to deeply understand both the codebase and the documentation.
Throughout the audit, they maintained clear and consistent communication with our developers, which helped the process run smoothly.
The team was also very responsive and flexible, adapting to our needs as they arose.
“Audited by Null Return.”
Launchnodes · Canton KMS Driver
Read on LinkedIn ↗“2xSwap has been independently audited by Null Return.”
AlphaDEX / 2xSwap · 5 March 2026
Read on X ↗04 / HOW WE WORK
From the first architecture discussion to the final report, the engagement is built around your system and its risks.
Align on architecture, code version, trust assumptions, priorities and deliverables.
Examine the agreed scope with manual analysis and targeted testing.
Discuss findings with your engineers and review fixes within the agreed scope.
Receive a report with findings, severity, remediation status and review boundaries.
THE COMPANY BEHIND THE REVIEW
NullReturn is a security company working across smart contracts and digital asset infrastructure. We help teams identify and address security risks across on-chain logic, applications, and the infrastructure that connects them.
Discuss the system with us. Explore our published work. Define an engagement around the risks that matter to your team.
BEFORE WE START
Yes, even if your code and specification are not yet complete. We can start with your architecture or individual modules to identify potential issues early. Together, we will define what is useful to review now and what should be checked before launch.
Tell us about your project, priorities, and budget. We will propose a suitable scope, from reviewing a single component to a comprehensive audit or a phased engagement. We agree on the fee and review boundaries before work begins.
A short project description and your preferred timeline are enough to start. A repository or architecture diagram helps with the estimate if available. We will clarify the details and propose a scope, fee, and realistic schedule.
We discuss findings with your engineers, explain the risks, and recommend ways to address them. We review fixes within the agreed scope and timeframe, and document the results in the final report.
Yes. If needed, we can agree an NDA before you share code. Publication of a report or case study is discussed with you separately and is not a requirement for working with us.
Not sure where to start? Tell us about your project — we will help you define the next step.
Discuss your project →LET’S DEFINE YOUR SCOPE
Tell us about your system and the review you need. We’ll use the brief to discuss scope, timing and a tailored proposal.
hi@nullreturn.io ↗A high-level description is enough to start.
We can discuss an NDA before code access.
This is a preview. Nothing has been sent.
Thank you — we’ll review your project and get back to you.