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FILE - In this Thursday, March 20, 2014, file photo, Christopher David uses a Robocoin kiosk to sell bitcoins outside of the 500 Startups' Bitcoinference in Mountain View, Calif. Bitcoin, the digital currency, is the payment of choice for HBO’s cyberattackers. Bitcoin allows people to buy goods and services and exchange money without involving banks, credit card issuers or other third parties. It remains relatively little used, but holds big appeal for tech enthusiasts, speculators and criminals. (AP Photo/Jeff Chiu, File)

FILE - In this Thursday, March 20, 2014, file photo, Christopher David uses a Robocoin kiosk to sell bitcoins outside of the 500 Startups' Bitcoinference in Mountain View, Calif. Bitcoin, the digital currency, is the payment of choice for HBO’s cyberattackers. Bitcoin allows people to buy goods and services and exchange money without involving banks, credit card issuers or other third parties. It remains relatively little used, but holds big appeal for tech enthusiasts, speculators and criminals. (AP Photo/Jeff Chiu, File)

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