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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteChoose a DeFi security audit firm by matching the proposed team and review methods to your protocol’s architecture and threat model—not by relying on a logo, a directory listing, or the word “audited.” Before comparing quotes, define the code revision and components to review, then check who will do the work, how the firm will test the protocol, what evidence its report will contain, and how fixes will be handled. An audit is an independent review that can reduce uncertainty; it cannot guarantee that a protocol is safe.
Start with the protocol’s risks, not a firm shortlist
A useful proposal depends on whether the auditor understands what your protocol does and where its security boundaries lie. Prepare a concise description of the system before asking firms to estimate the work.
Describe the architecture and trust assumptions
Document the contracts and other components, how they interact, which assets or permissions are at stake, and what assumptions the design makes about users, administrators, governance, and external services. Include upgrade paths, privileged roles, dependencies, and the security properties you expect the system to preserve. Architecture diagrams, technical documentation, prior findings, and records of fixes help an auditor understand the system in context.
Identify components beyond smart contracts
A smart-contract audit does not automatically cover a website, database, off-chain service, oracle operator, bridge, or third-party dependency. OWASP’s Smart Contract Security Verification Standard (SCSVS) addresses EVM smart-contract security; systems outside the blockchain need appropriately scoped reviews of their own. Ask firms to name each component they will assess and each one they will treat as trusted or out of scope.
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Write down the scope and freeze the code target
Ask each candidate to propose against the same written scope. OWASP’s guidance for smart-contract security reviews emphasizes access to project materials and the need for reports to identify what was and was not reviewed. Its implementation guidance recommends agreeing on an exact commit and handling changes during a review as formal scope amendments.
Put these details in the engagement scope
- The repository and exact commit hash, plus the contracts, packages, and deployment targets under review.
- Explicit exclusions, including components treated as trusted, previously reviewed, or outside the engagement.
- The protocol functions and security properties the review is intended to examine.
- Dependencies and integration points the firm will assess, and those it will not.
- Documentation, developer access, roles, blockchain interfaces, logs, and test environments the firm needs.
- How newly discovered dependencies, code changes, and other scope amendments will affect timing, fees, and the final report.
- Expected report contents, severity definitions, remediation discussions, and any retest or re-review arrangement.
Without a fixed code target, a report can describe a version different from the one that ships. Agree in advance how changes will be recorded and whether affected work must be repeated.
Compare the actual team and review methods
Request the names or defined roles of the people assigned to the engagement, their relevant experience with your language, execution environment, and protocol mechanisms, and an explanation of how their work will be divided and checked. Ask how the proposed scope will be reviewed—not just which tools the firm owns.
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Ask how methods fit the attack surface
Depending on the code and risks, a plan may combine manual review with static or dynamic analysis, fuzzing, invariant testing, or formal verification. Ask which methods the firm intends to use, what parts of the scope each one covers, and what deliverables will show that the work was performed. Ethereum.org describes audits as typically involving testing and manual review, sometimes including formal verification; automated tools and human review have different benefits and limits.
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Tool output alone is not evidence of a complete review. OWASP says automated tools alone are insufficient for its verification process, and tools can miss bugs or produce false positives. A 2025 protocol-security document hosted by the SEC describes one model that calls for qualified human review and encourages appropriate automated testing without substituting it for human review. That document is a particular proposed framework, not a universal legal rule for every DeFi project.
Evaluate reports and remediation follow-through
Read public reports from a candidate when available. They show how the firm communicates findings, but an old report does not prove that the same people or process will be used for your engagement. Ask to see an example that lets you judge whether a reader can understand what was checked, reproduce a finding, and assess whether a fix addresses it.
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Check what the report makes verifiable
- Does it identify the reviewed code version, scope, and exclusions?
- Does it explain findings with enough detail to reproduce and fix them?
- Does it record passed and failed controls and provide remediation guidance?
- Does it preserve supporting evidence, such as work papers, screenshots, scripts, or relevant blockchain logs?
- Does it say whether fixes were reviewed, and how the firm handles disputed findings or changes made after the review?
Ask how severity is determined and whether findings are discussed with your developers before the report is finalized. The sources available for this topic do not establish a single industry-wide severity scheme or required retest format, so compare the firm’s definitions and proposed process directly rather than assuming the labels mean the same thing everywhere.
Choose the review format that fits the work
A firm-led engagement, an audit competition, and a bug bounty bring outside reviewers to code in different ways. Ethereum.org lists audit providers as well as competition and bounty platforms; its security guidance describes bug bounties as offering rewards for responsible disclosure, while describing audits as typically including testing and manual code review.
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Compare proposals on equal terms
Price is meaningful only after the scope is comparable. Ask each firm to specify the reviewers and time allocated, methods, covered components, report and remediation support, schedule, and charges for scope changes or re-review. The materials available here do not establish current market prices, typical engagement lengths, or a universal relationship between price and quality; treat each quote as a proposal to assess, not as a market benchmark.
| Comparison area | Questions to ask |
|---|---|
| Protocol fit | Has the proposed team worked with the relevant language, chain, and mechanisms? Can it explain the protocol’s trust boundaries and assumptions? |
| Scope | Which commit, contracts, packages, deployments, dependencies, and off-chain components are included or excluded? |
| Methods | What manual review and tool-assisted testing are planned, and which properties or attack paths will they examine? |
| Team and process | Who will do the work, how will quality be checked, and how will access and changes be handled? |
| Reporting and remediation | Will findings be reproducible, will remediation be discussed, and will the report record whether fixes were rechecked? |
| Format and operations | Is a firm engagement, competition, or bounty appropriate for this need, and how will findings be disclosed and handled? |
| Commercial terms | Do the proposals cover equivalent scope, people, methods, support, timing, and change costs? |
These are comparison questions, not a universal scorecard. Avoid assigning generic numerical weights: the importance of each factor depends on the protocol’s architecture and risks.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Use directories and standards carefully
Ethereum.org’s resource directory lists smart-contract audit providers including ConsenSys Diligence, CertiK, Trail of Bits, PeckShield, Quantstamp, OpenZeppelin, Runtime Verification, Hacken, Nethermind, HashEx, Code4rena, CodeHawks, Cyfrin, ImmuneBytes, Oxorio, and Inference. It also lists vulnerability or bounty platforms including Immunefi, HackerOne, HackenProof, Sherlock, and CodeHawks. Treat these names as a starting point for diligence, not as an endorsement, ranking, confirmation of current capacity, or evidence that a firm fits your protocol. Verify the proposed team, availability, scope, and terms directly.
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OWASP describes SCSVS as an open standard for security requirements for EVM-based smart contracts, not a vendor certification program. Its assessment guidance says OWASP does not certify vendors, verifiers, or smart contracts. A firm may accurately say its work uses or maps to SCSVS; that is different from claiming official OWASP certification. The OWASP project page identifies version 0.0.1, dated September 2024, as its latest stable version in the information described there.
Interpret audit evidence without treating it as a safety guarantee
Ethereum.org cautions readers not to treat audits as a silver bullet. A peer-reviewed 2023 study illustrates why: its combined literature and 45-audit-report dataset identified 49 vulnerabilities, while its effectiveness dataset included 189 exploited vulnerabilities—140 from non-audited projects and 43 from audited projects. In a particular analysis of 43 attacked audited projects, the authors found that reports mentioned the later-exploited vulnerability in 7 instances, auditors had searched for but not detected it in 11, and reports did not mention it in 25.
Those figures describe the study’s dataset and methods, not universal audit effectiveness rates. They do not establish that audits caused or prevented a particular share of losses. They do show why an audit should be treated as one security measure: useful independent scrutiny, but not proof that every vulnerability was found or that later changes and operational risks are covered.
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