There’s a new development in this matter. According to breaking news from Phoenix Finance, just yesterday on the 7th, Chen Zhi was arrested in Cambodia and extradited back to China. The technical tracing report released by China’s National Computer Virus Emergency Response Center also revealed the cause of the theft: a 'pseudo-random number vulnerability' in the private key generation of Bitcoin wallet addresses, leading to the theft of over 130,000 $BTC.