Smart Contract Audit Guide
Everything you need to know about preparing for, conducting, and leveraging smart contract security audits.
The Audit Process
1
Pre-Audit Preparation
Prepare your codebase and documentation before the audit.
- Complete development and freeze code
- Write comprehensive documentation
- Run automated security tools
- Prepare deployment scripts
- Document known issues and design decisions
2
Auditor Selection
Choose qualified auditors for your project.
- Research auditor reputation and past work
- Request quotes from multiple firms
- Verify auditor expertise in your protocol type
- Check for conflicts of interest
- Agree on timeline and scope
3
Active Audit Phase
Collaborate with auditors during the review.
- Provide access to codebase and docs
- Schedule kickoff call
- Be available for questions
- Review preliminary findings
- Discuss severity classifications
4
Remediation
Address identified issues and verify fixes.
- Prioritize critical and high issues
- Implement fixes carefully
- Document reasoning for any accepted risks
- Request re-review of fixes
- Update documentation
5
Final Report
Publish the audit report and prepare for launch.
- Review final report
- Publish report publicly
- Set up bug bounty program
- Plan incident response procedure
- Monitor post-launch
Pre-Audit Checklist
Access Control
- Ownable/AccessControl implemented
- Admin functions protected
- Privileged roles documented
Reentrancy
- CEI pattern followed
- ReentrancyGuard where needed
- External calls minimized
Arithmetic
- Solidity 0.8+ or SafeMath
- Division by zero handled
- Overflow scenarios tested
External Calls
- Return values checked
- Untrusted contracts handled
- Gas limits considered
Testing
- 100% function coverage
- Edge cases tested
- Fuzz tests included
Recommended Auditors
Trail of Bits
Complex protocols, L2s
OpenZeppelin
DeFi, Token standards
Consensys Diligence
Ethereum ecosystem
Spearbit
DeFi, Novel protocols
Code4rena
Crowdsourced audits
Sherlock
DeFi coverage + audits
Important Note
An audit is not a guarantee of security. Always combine audits with ongoing monitoring, bug bounties, and multiple layers of defense.