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Mt. Gox attorneys say in a court filing that Mark Karpeles is unwilling to travel to the US to address questions regarding the exchange's closure.
Exchange specializing in the virtual currency announces it's ceasing all trading operations and plans to return funds to its users.
Coinsetter hopes to capitalize on recent interest in the virtual money by creating a platform that will allow investors to short the currency, which has appreciated 1,500 percent since January.