Block Security Arena (BlockSecX) is a Web3 AI security infrastructure building a closed-loop protection ecosystem for blockchain developers and users. The platform combines AI-driven tools with gamified education, including an AI security academy powered by RAG technology, a Docker-based attack simulation sandbox, an AI audit assistant for smart contract developers, and a real-time token risk radar. By uniting learning, simulation, auditing, and monitoring, Block Security Arena helps projects proactively identify vulnerabilities, reduce exploit risk, and strengthen on-chain security across DeFi and Web3 ecosystems.