Abstract: Blockchain technology and applications are still in the early stages of rapid development, and there are many types of security risks. From the security of blockchain ecosystems to smart contract security, consensus mechanism security and underlying infrastructure components, security issues are widely distributed and risky, and the overall impact on ecosystems, security audits, technology architecture, privacy data protection and infrastructure Development has presented a new challenge.

Key words: eco- application security, smart contracts, consensus mechanisms, basic components, security auditing, privacy data protection