A number of San Diego businesses now house BTMs, Bitcoin Transaction Machines, where users can convert paper currency into bitcoins, the decentralized digital currency that goes into a "virtual" wallet on your mobile phone. Beer bar Downtown Johnny Brown's is one of the newest owners of a BTM, which will also be available at Spiritos Italian Diner in Carlsbad, Rossi's Pizza in San Marcos and Surf Brothers Teriyaki locations. [NBCSD]
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