On-Chain Security in the AI Agent Era: Where Does Web3's Security Boundary Lie?
This article provides a comprehensive analysis of how AI agents are reshaping on-chain security, starting with the Grok/Bankr incident that exposed trust vulnerabilities between automated systems. It details eight major attack surfaces including prompt injection, blind signing, memory poisoning, privilege escalation, autonomous authorization risks, supply chain attacks, x402 payment layer attacks, and AI-powered social engineering. The report surveys existing defensive solutions from Cobo, Fystack, Thirdweb, Coinbase/OKX/Binance, GoPlus/SlowMist, and KYA/ERC-8004, and proposes six security principles. It argues that security will be the most deterministic industrial opportunity in the agent economy, determining whether AI can truly enter the financial execution layer.



