According to the monitoring of Beosin-Eagle Eye of the Chengdu Chainan Blockchain Security Situational Awareness System, there were more than 17 typical security incidents in March, involving Ethereum DeFi security, exchange security, and fraud road issues, including the security of virtual currency assets Issues and user data security issues. There were 3 more typical security incidents on DeFi: bZx Lightning Loan Second Blossom Attack, which caused users to lose $ 140,000; MakerDao decentralized DeFi project with ETH as collateral assets was liquidated, and 1462 auctions were concluded with 0 dai, resulting in The platform lost a total of $ 7.8 million; the DeFi project Synthetix exposed a contract vulnerability. On the exchange side, two more typical security incidents occurred: hackers Tian Yinyin and Li Jiadong laundered more than US $ 100 million in several exchanges; a new USDT fake recharge attack appeared on the OMNI chain. There were 4 typical incidents in terms of fraud and crypto scams: there were illegal elements conducting crypto scams related to the new crown virus; BTC appeared a fake two-dimensional code scam; Sprite Exchange launched Air Coin PETH and the opening was zero, and the amount involved was about 40 Thousands of RMB; Blockchain funds dish “Silicon Valley Block Chicken” is suspected of crashing. Four other security incidents occurred: Trident, a crypto investment fund, was hacked; 523 million user data leaked on Weibo users; South Korea ’s incident involving payment of virtual currency in room N; and the Ethereum “One-click Coin” platform passed the The currency contract was implanted in the back door to obtain illegal profits. In general, the March blockchain security incident involved the expansion of levels. Among them, darknet funds, crypto scams, and money laundering are the key issues facing exchanges at the current stage. How to deal with on-chain transaction risks? Continuous monitoring and evaluation to support VASP, regulatory authorities, law enforcement agencies, and other businesses in risk management, compliance supervision, and investigation and evidence acquisition are important tasks in carrying out blockchain ecological security supervision and promoting compliance construction. Beosin-AML, a virtual asset anti-money laundering compliance and investigation and evidence collection system, will be launched to help the blockchain ecological application establish a complete protection system.