Cross-contract reentrancy
State assumptions that hold within a single function break when execution flow returns through composable callbacks. The hardest reentrancy bugs span contract boundaries.
// Services / DeFi
DeFi protocols ship faster than auditors can keep up.
DeFi composability is the source of both its value and its largest attack surface. Every new protocol inherits the security assumptions of the protocols it integrates with. Every state change ripples through positions held by users you've never seen. The hardest bugs aren't in your contracts. They're in the interactions between your contracts and the ones you depend on.
Existing solutions don't keep pace. A single complex DeFi audit runs $75K to $250K and takes weeks or months. By the time a report ships, the code has moved on.
// Attack surface
Where the bugs hide.
Oracle manipulation
Flash loans, price feed staleness, and TWAP edge cases turn read-only values into attack vectors. Most oracles look correct in isolation and fail under adversarial conditions.
Accounting precision
Rounding errors, share/asset drift, and fixed-point math bugs that drain protocols slowly or all at once. Off-by-one in the wrong place is a million-dollar bug.
Composability assumptions
What happens when a protocol you integrate with pauses, upgrades, or itself gets exploited. Your security depends on assumptions you didn't write.
Governance and access control
Privileged functions, time-locked parameter changes, and emergency procedures that don't behave the way the documentation says they do.
MEV and ordering
Frontrunning, sandwich attacks, and value extracted by sequencers and searchers in ways the protocol didn't model.
Built by people who audited DeFi by hand.
Both founders spent years auditing DeFi protocols by hand at Trail of Bits, Spearbit, and Certora, three of the most respected names in protocol security. Through Offbeat Security they worked with clients including Uniswap, Optimism, and zkSync. The patterns they learned in those engagements — what to look for, what to verify, what's worth digging into — are embedded into how Zero Cool's agents prioritize.
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