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Bitcoin currency exchange BitFloor is in big trouble after a security blunder resulted in the theft of $250,000. The heist at the BitFloor "exchange" came after operators did the online equivalent of leaving the keys in the door. Bitcoin is a ... virtual currency that isn't controlled by a government and therefore isn't subject to any seizure of funds. With no government backing, Bitcoin has value only so long as enough people agree to use it. Unlike most currencies, Bitcoin exists only online, with no physical currency (like coins or bills). Each Bitcoin exists solely as a unique identification ... (view more)