The Anatomy of a Smart Contract Audit: What Auditors Look For

The Anatomy of a Smart Contract Audit: What Auditors Look For In November 2022, a single integer overflow bug in Wormhole's token bridge drained $325 million in wrapped Ethereum. 1 The code was audited twice. The vulnerability existed in plain sight: a lack of proper state validation that allowed an attacker to forge signatures and drain the vault. This wasn't a novel zero-day. It was Protocol 101 stuff, executed poorly. If you're about to launch a smart contract and thinking an audit is just a rubber stamp—or worse, that it's optional—this article is your wake-up call. What Auditors Actually Hunt For Auditors look for four categories of bugs: access control failures and reentrancy, arithmetic errors and overflow/underflow, state management issues and improper validation, and cryptographic and signature vulnerabilities. Most audits take 2–6 weeks and cost $10k–$500k+. They still miss edge cases. Assume your code is broken until proven otherwise. How an Audit Actually Works A competent