Raspberry Pi-powered briefcase converts loose change into bitcoin

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Hackers at the Defcon hacker conference in Las Vegas were recently seen offering bitcoin for sale via a robotic briefcase. People could simply walk up and put their loose change into the coin slot and in return they received a QR code printed on till receipt paper that they could use to redeem their bitcoins.

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Story added 9. August 2013, content source with full text you can find at link above.