Plain English
A smart contract audit is a formal security review of contract code by specialized security firms (Trail of Bits, OpenZeppelin, Spearbit, Code4rena). The auditor publishes findings — critical, high, medium, low — and a hash of the exact reviewed code. Reading these reports is one of the highest-ROI 20 minutes you can spend before depositing into a new protocol.
How it actually works
Auditors use static analysis tools, fuzzing, manual review, and formal verification on critical paths. The output is a public report; reputable protocols fix all critical/high findings before relaunch. Code4rena and Sherlock crowdsource audits via competitive contests, complementing single-firm reviews. Audits do not catch everything — multiple post-audit hacks have happened.
What it means for you
For any protocol holding meaningful capital, the audit history is non-negotiable due diligence. Check: (1) Was the audit done by a known firm? (2) Were findings fixed and re-reviewed? (3) Was the deployed code identical to the audited version? Most HNW losses in DeFi happen in unaudited protocols where users assumed “audited” meant “safe.”
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Educational content only. Not investment, tax, or legal advice.