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Bitcoin: the virtual currency built on math, hope and hype

2 Photos Jeremy Kirk (IDG News Service)

Bitcoin's sharp rise in value this year has many questioning whether the virtual currency is sustainable in the long term

The value of all bitcoins in circulation reached nearly US$15 billion in early December, as its value soared following strong interest from China.
Bitcoin's sharp rise in value this year has many questioning whether the virtual currency is sustainable in the long term.