On-chain investigator ZachXBT has uncovered a hacker known as "John," linked to $23 million in stolen cryptocurrency. This discovery is connected to a 2024 U.S. government seizure related to the Bitfinex hack. The exposure was facilitated by the hacker's public boasting in a group chat, which allowed blockchain tracing to specific addresses. The investigation utilized blockchain data and recorded chats to trace the stolen funds, leading to rapid wallet cleanups on Ethereum and Tron networks. This incident underscores the transparency benefits of blockchain technology in cybercrime investigations, highlighting security vulnerabilities in centralized storage without causing immediate market disruptions. The exposure has heightened market alertness and emphasized the importance of blockchain's transparency in law enforcement. While no official statements have been made by regulators, the case demonstrates the potential of blockchain forensics in uncovering financial crimes.