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Define exactly what the audit must cover
Before requesting proposals, prepare a reproducible description of the system and the code to be reviewed. A quote is meaningful only when firms are pricing the same revision and components.
- Target chain and runtime, contract language, and repository commit or other immutable source reference.
- Contracts, libraries, deployment configuration, oracle connections, privileged roles, governance paths, and external services that are in scope.
- Protocol architecture, assets at risk, known concerns, planned deployment date, budget range, and any specific requirements such as formal verification or jurisdiction-specific work.
- Explicit exclusions, including dependencies or external protocols that the project integrates with but does not control.
Reviewing your integration does not automatically mean the auditor reviews the external protocol it calls. Likewise, a subsequent upgrade or code change may not be covered by the original engagement. Make those boundaries explicit in the scope and proposal. See Ethereum.org’s smart contract security guidance and OWASP’s Smart Contract Top 10 for broader security context.
Match the firm to your chain and threat model
General security reputation is not a substitute for experience with your particular language, runtime, assets, trust boundaries, and attack surface. Ask which people will do the work—not just which company will sign the report—and whether they have reviewed comparable systems recently.
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- Request examples of work on the target chain and protocol type.
- Ask for the names, roles, and expected availability of the reviewers assigned to your engagement.
- Request recent client references from projects with similar design or risk profile.
- Discuss the protocol’s key invariants and likely attack paths, not only its code size or framework.
Use references and public work as evidence to investigate, not as a ranking by themselves. A firm’s experience is most useful when it maps directly to the system being reviewed.
Read reports for evidence, not just a clean summary
Where possible, read two or three public reports for projects using the same technology stack. Evaluate whether a report lets a reader understand what was examined, what was found, and what happened next.
Rank #2
- Scope and revision: Does the report identify the code version, in-scope components, and exclusions?
- Root cause: Does each finding explain the underlying defect and its impact, rather than merely label a symptom?
- Reproducibility: For serious findings, does the report provide enough proof-of-concept detail to understand or reproduce the issue?
- Remediation tracking: Does it record the project’s response, the status of each finding, and whether fixes were checked?
- Sign-off: Is there a clear record of retesting or final review status?
- Limitations: Does the report explain what the review did not cover?
A report with no findings means no issue was reported within that scope and process. It is not evidence that the contracts are safe in every circumstance or that unreviewed components are secure.
Ask how the review is performed
Ask the firm to explain how expert manual review relates to static analysis, fuzzing, symbolic execution, or formal verification where those methods fit the system. Tools can supplement reviewer judgment; they do not replace understanding protocol-specific risks and invariants. Find out what the team will actually test and how results from different methods feed into findings.
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Published methodologies can help you understand a provider’s stated process, but they are not independent proof of quality. For example, Hacken’s Smart Contract Code Review And Security Analysis Methodology is version 3.0, dated June 16, 2026. Treat it as a vendor-authored description of that firm’s approach, not as an endorsement or comparative evaluation.
Compare private audits, contests, and combined reviews
The delivery model affects how reviewers engage with the system. The choice depends on whether you need sustained design discussion, independent competition among reviewers, or both.
Rank #4
| Model | Typical fit | What to verify |
|---|---|---|
| Private audit | A defined scope reviewed by an assigned team, with a report; may suit sustained discussion of protocol design. | Named reviewer availability, scope and exclusions, report deliverables, remediation support, and retest terms. |
| Competitive review | A platform brings multiple independent reviewers or contestants; may suit broader code-level bug finding. | How the contest scope is defined, what deliverables and follow-up are included, and how findings are validated and handled. |
| Combined approach | May fit teams seeking both sustained protocol-design review and independent code review. | How scopes complement one another and whether both reviews cover the same revision or distinct risks. |
This is a decision heuristic, not a universal guarantee that one model finds more or better bugs. Ethereum.org’s security guidance provides ecosystem context; it is not a comparative performance study of providers.
Set remediation and retest terms before signing
Find out what happens after the report arrives. A finding’s status matters: “resolved” means it was addressed in the reviewed change, while “acknowledged” means it was accepted or noted and may not have been fixed.
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- Are implementation questions and finding-by-finding responses included?
- Does the fee and schedule include fix verification? If so, how many retest rounds?
- Will the auditor update the final report with remediation status and retest sign-off?
- Which changes to features, dependencies, or configuration require a new scope or fee?
- How are disputed findings or issues identified after the engagement ends handled?
- What are the confidentiality, disclosure, and public-report terms?
Fixes should be checked against the actual revised code. Confirm which revision a retest covers and whether a material change after that point requires additional review.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Compare proposals on identical terms
Request multiple proposals using the same repository revision, components, exclusions, deliverables, reviewer seniority, schedule, disclosure terms, and assumptions about retesting. Otherwise, a lower quote may simply describe a narrower engagement. Ask each firm to explain what its proposed fee and process do—and do not—cover.
There is no reliable market-wide price benchmark established here. Do not choose the cheapest firm without verifying its capability on your target stack. A very low bid could reflect a narrower or more automated review, but test that against the written proposal rather than assuming it.
Evaluate incident history in context
When reviewing a firm’s public audit record, connect each incident to the specific contract, scope, and timing. A later governance change, upgrade, or operational key compromise is not automatically evidence that the auditor missed an in-scope code defect. Conversely, a clean public record is only one signal; it may reflect a smaller or lower-risk client sample.
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Quick Recap
Questions to ask before hiring
- Who specifically will review the code, and what have they reviewed on this chain and protocol type?
- Which repository commit and components are in scope? What dependencies, integrations, deployment settings, privileged roles, or governance paths are excluded?
- How do you combine manual review with static analysis, fuzzing, symbolic execution, and formal methods where applicable?
- Can we inspect reports for comparable systems, including scope, proof-of-concept evidence, remediation history, and retest sign-off?
- What happens when findings are disputed or discovered after the engagement ends?
- Does the proposal include retesting fixes? How many rounds, and what changes trigger new scope?
- Can you provide references from recent clients with similar protocols?
- What are the disclosure, confidentiality, and public-report terms?
