#加密货币安全事件 This incident once again reminds us that the security of Bitcoin private keys cannot be ignored. Vulnerabilities caused by weak random number generators have resulted in such enormous losses, which is truly shocking. Looking back at the entire event, it accumulated from 2019 and exploded by the end of 2020, only being fully understood in 2023 to identify the root cause, taking nearly five years. This reflects the lag in blockchain security analysis and the industry's insufficient awareness of the importance of randomness. In the future, we need to be more cautious when developing and using wallets to scrutinize the random number generation process. At the same time, this also highlights the necessity of continuously monitoring on-chain abnormal transactions. Even if it was impossible to determine whether it was theft at the time, issuing timely alerts might have prevented further larger losses.