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June 20 (Bloomberg) -- Virtual currency Bitcoin has risen in usage, notoriety and value in the past few months. A Bitcoin's worth fluctuates with demand, and just like cash, it is free to use and very hard to trace. About $130 million of Bitcoins now exist, and the value has risen more than 6,000 percent this year. Cris Valerio reports on Bloomberg Television's "Bloomberg West." (Source: Bloomberg)