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Dark side

4:40 AM ET Wed, 16 April 2014

Authorities say the online black-market bazaar Silk Road could be the tip of the iceberg when it comes to the criminal underworld using bitcoin for trading in illicit goods and services. On the "Dark Web," fake IDs, drugs, even hit men are all paid in bitcoin. CNBC's Mary Thompson explores why bitcoin is the currency of choice for criminal activity on the dark web and reports on the story of Mt. Gox, the largest bitcoin exchange, which shut down in February, leaving bitcoin investors holding the bag.