Ilya Lichtenstein and Heather Morgan, the couple who were arrested last year for the massive 2016 Bitfinex hack involving billions of dollars of cryptocurrency, have pleaded guilty in court. Lichtenstein has admitted that he used multiple advanced hacking tools and techniques to gain entry into the cryptocurrency exchange's network. He then authorized 2,000 transactions to move 119,754 bitcoins to wallets he controlled. To cover his tracks, he said he deleted access credentials, logs and other digital breadcrumbs that could give him away. Morgan, his wife, helped him move and launder the stolen funds.