Karpeles buys Mt. Gox from an unemployed software hacker named Jed McCaleb. Before the site started trading in Bitcoins, it was an online marketplace where people could buy and sell cards for the Magic: The Gathering trading card game. Mt. Gox is short for “Magic: The Gathering Online Exchange” McCaleb, nervous about regulatory scrutiny on bitcoin, wanted rid of the exchange and sold it to Karpeles in for no upfront fee, people with knowledge of the deal said. Karpeles told others he had later paid McCaleb a small fee, calling it “a very good deal”.