With more than $3.4 billion stolen from protocols in 2025 alone, including the $1.5 billion Bybit hack, the security crisis in Web3 has reached a critical point. The largest hacks originated from operational mistakes, multisig signers, and permission mismanagement. In 2026, founders who view security audits as a one-time checkbox rather than an ongoing initiative are playing with fire with their users’ funds and the future of their protocol.
Approximately 70% of hacks in 2025 were attributed to vulnerabilities that could have been identified through proper security audits. This checklist has been compiled from the hardest lessons learned from the most catastrophic hacks of last year, from preparation before the audit to post-launch checks.
Key Takeaways
- Web3 founders should treat security audits as an ongoing process with preparation, remediation, upgrades review, and constant monitoring.
- Combine internal reviews, external audits, AI analysis, contests, and bug bounties to catch both obvious and edge-case vulnerabilities.
- Publish audit reports, monitor protocols in real time, secure upgrades, and maintain bug bounties to protect users and institutional credibility.
To understand crypto network design and security, every founder should also plan to invest in pre-audit preparation, selecting audit partners, and post-audit security, to control how failures occur and mitigate their effects when they do. These include:
- Define Your Complete Security Scope
Identify all smart contracts involving users’ funds, external dependencies on other protocols, privileged roles, upgrade paths, and off-chain components influencing on-chain decisions. Draw up architecture diagrams to illustrate how contracts interact. Map out all functions that modify state, accept external input, interact with other protocols, or hold admin privileges. Lock your commit hash before the audit process starts.
- Set Target For Test Coverage
The minimum code coverage is 80% across the industry, while top projects might even be as high as 90%. This includes normal operations, error paths, failed external calls, simultaneous user interactions, and unusual function flows. Run fuzz testing with random inputs. Perform static analysis with tools such as Slither (23% of high-severity issues).
- Document Invariants and Assumptions
Highlight the cornerstone rules upon which all others can be fulfilled. For instance, total debt should not exceed collateral beyond liquidation thresholds in lending protocols, whereas locked tokens equal minted tokens in bridges. Enumerate all assumptions regarding oracle timing, function sequences, and external protocol behavior. Identify those who have access, including admins, oracle providers, multisig signers, integrated protocols, and privileged addresses.
- Review Access Controls
Check who can do what in your system. Set timelocks on upgrades and parameter modifications. In multisigs, geographically distributed signers, review processes, and hardware wallet usage are necessary. The Bybit incident demonstrated that multisig security is not secure if signer security is not secure.
- Conduct Internal Reviews
Outline your attack surface map before undergoing external audits. Look for suspicious patterns such as unchecked external calls, unprotected arithmetic, delegate calls to untrusted addresses, timestamp dependencies, and unbounded loops. Fix all issues before commencing external audits.
- Choose Based on Requirements
For full lifecycle security, Sherlock provides collaborative audits from 11,000+ researchers, in addition to AI analysis and available bug bounties. For complex infrastructure or cryptography-intensive systems, Trail of Bits offers in-depth knowledge of formal verification. CertiK offers scalability with 5,900+ audits completed and real-time Skynet monitoring. Hacken offers expertise in MiCA and other compliance frameworks.
- Use Multiple Approaches
The best current protocols use AI analysis in development, collaborative audits for detail, contests for scope (dozens of independent researchers), and bug bounties after deployment. Each has its own advantages, for example, collaborative audits offer methods and expertise, contests reveal corner cases, bounties secure running code, and AI allows constant verification.
- Verify All Fixes
After receiving the report, it is necessary to implement the fixes carefully. Once done, test them. Finally, have the audit team check the remediation of the issues. This will ensure that your fix has indeed solved the problem without creating new ones.
- Publish Reports
Publish complete audit reports, including findings and remediation status. Explain what was in scope and how you addressed each finding. Document why any findings remain unfixed and what alternative mitigations exist. Transparency is expected by institutional investors and major exchanges in 2026.
- Constant Monitoring
Implement real-time monitoring for unusual transactions and known attack patterns. Tools, such as CertiK Skynet or Hypernative, detect exploits in progress. Build incident response plans defining pause authority, communication channels, and coordination procedures. Join networks for rapid response coordination. Speed matters when attacks happen.
- Secure Upgrades and Changes
Each upgrade, integration, or parameter change introduces new risks. Consider major changes to be under security review. Major upgrades, minimum review for smaller changes. When external protocols receive upgrades, review the impacts on security assumptions. Record all changes to privileged controls and admin keys.
- Maintain Bug Bounties
Leading protocols maintain bounties with severity-scaled rewards. Platforms such as Immunefi and HackerOne help to simplify program management. Effective programs offer $10,000+ for low severity issues up to $1 million+ for critical vulnerabilities in high-value protocols.
Precautions
Take note of the following while adhering to the security audit checklist
- Do not treat audits as marketing tools.
- Do not rush through the process or overlook medium and low-severity issues.
- Do not assume that your audit has checked everything (front-end security, key management, and infrastructure are usually excluded).
- Understand your attack surface before deployment.
- Know what could go wrong and how much damage could be caused by different failure points.
Bottom Line
Web3 security in 2026 requires ongoing programs. Key steps include preparation with target test coverage, selecting audit partners that align with your technical requirements, layering multiple security methodologies for depth, and launching with ongoing monitoring. Upgrading for security, running bounties, and continuously testing behavior post-launch are what separate the survivors from the devastating hacks. In an industry where code is law and errors are permanent, disciplined security is not a choice. It is the building block for everything you are creating.
