A technical report by the Milk Sad research team has uncovered the cause of the 2020 theft of approximately 120,000 BTC, initially valued at $3.7 billion and now worth around $150 billion. The stolen bitcoins were linked to wallets generated by the Chinese mining pool Lubian.com, which used a flawed pseudo-random number generator (PRNG) to create private keys. This flaw made the keys vulnerable to calculation and exploitation. U.S. law enforcement recently recovered the relevant private keys, not through hacking, but by identifying the systemic flaw in the wallet generation mechanism. This discovery highlights significant vulnerabilities in the security practices of some cryptocurrency operations, emphasizing the need for robust cryptographic standards.