The buzz continues: Earlier this week, investors including billionaire Richard Branson and Yahoo co-founder Jerry Yang put $30 million into BitPay, a payment-processing rival of Coinbase. Mr. Branson's Virgin Atlantic airline accepts Bitcoin and uses BitPay for processing. World-wide, about 20,000 merchants accept Bitcoin, stored by customers in virtual wallets like Coinbase's. In December, Mr. Armstrong's company raised $25 million thanks to the heavyweight venture-capital firm Andreessen Horowitz. There's gold in them hills.

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