About 1.75 million bitcoins held by Mt.Gox and its customers have disappeared, according to Teikoku Databank, a Japanese bankruptcy tracking firm.
The asset freeze also extends to Mt.Gox's U.S. affiliate, and its Japanese parent company, Tibanne, according to Christopher Dore, an attorney representing an American Mt. Gox customer who is now suing the exchange.
Even before Mt. Gox went down, the company already had big financial problems.
By its own account, the firm collected only $380,450 in revenue during most of 2012. But it lost 13 times that the next year, when U.S. government agents seized $5 million from its accounts for allegedly lying on bank documents.