Bitcoin exchange struggles

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NEW YORK — A major player in the Bitcoin universe was struggling to stay alive Monday, raising questions about whether there is a fundamental flaw in the computer program that underlies the virtual currency.

The price of Bitcoin has fallen sharply, to below $600 for a single Bitcoin from more than $800 a week ago.

Mt. Gox, a Japanese company that was previously the largest Bitcoin exchange in the world, halted all customer withdrawals late last week.

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