DeFi Security Offense and Defense in the AI Era: A Practical Guide from Attack Surfaces to Defense Layers

BroadChain, April 28 - As AI technology lowers the cost of vulnerability discovery, DeFi protocols face unprecedented security challenges. Q1 2026 has become the most densely targeted quarter for hacker attacks in history, and the start of Q2 threatens to break records. The attack surface is concentrated in three areas: protocol teams, smart contracts and infrastructure, and the boundaries of user trust (such as DSN and social media).

Defense requires building a four-layer system: the prevention layer reduces the probability of exploitation through strict processes; the mitigation layer limits losses when prevention fails; the pause layer triggers a master switch to freeze operations immediately after an attack is confirmed; and the recovery layer replaces compromised components. Core principles include: aggressively adopting cutting-edge AI to scan codebases and configuration vulnerabilities, introducing time locks and multi-step workflows to increase attack friction, and encoding invariants into contracts.

Power balance is crucial—even if a multi-signature wallet is compromised, the rescue mechanism must be able to quickly restore the protocol's governance state, but it cannot replace governance itself. Teams should assume from day one that "they will be hacked," set a loss limit of 5-10% and circuit breakers, and practice response processes before an attack occurs. In the age of AI, this means having the ability to rapidly synthesize large amounts of information and generate concise summaries and long-form analyses. Perfection is not necessary; survival is the goal.