US prosecutors have recommended a five-year prison sentence for Ilya Lichtenstein, the mastermind behind the Bitfinex exchange hack.Lichtenstein stole 120,000 Bitcoin and used sophisticated methods to hide the stolen funds between 2016 and 2022.Lichtenstein's wife and co-conspirator, Heather Morgan, received a recommendation of an 18-month prison sentence for her assistance in the case.Prosecutors argue that a stronger sentence for Lichtenstein will deter young cybercriminals and break the cycle of such online activities.