itwbennett writes: When Mt. Gox collapsed on Feb. 28, 2014, with liabilities of some ¥6.5 billion ($63.6 million), it said it was unable to account for some 850,000 bitcoins. Some 200,000 of them turned up in an old-format bitcoin wallet last March, bringing the tally of missing bitcoins to 650,000 (now worth about $180 million). In January, Japan's Yomiuri Shimbun newspaper, citing sources close to a Tokyo police probe of the MtGox collapse, reported that only 7,000 of the coins appear to have been taken by hackers, with the remainder stolen through a series of fraudulent transactions. But there's still no explanation of what happened to them, and no clear record of what happened on the exchange.