When a hacker, or hackers, broke into the Bitfinex crypto exchange and stole 119,754 bitcoins in 2016, their haul was worth $72 million. By the time US authorities arrested rapper Heather Morgan and her husband, startup founder Ilya Lichtenstein, last year on suspicion of laundering the stolen coins, their value had soared to nearly $4 billion. It’s the largest single recovery in the history of the US Department of Justice. But the perpetrator of the hack is still at large.