“A hacker called Garbage was milling around outside of the Rio convention center showing off the invention to fellow Bitcoin enthusiasts. ‘Most people know about Bitcoin, but they don’t have it,’ he said, hailing from Kalamazoo, Michigan with his group TwoSixNine, which built the device for around $250 using a Raspberry Pi microcomputer and a portable 4G modem. It takes in your spare change through a metal coin slot, checks the current exchange rate on Bitcoin trading post Mt. Gox, and prints out a QR code on receipt paper, which contains the cryptographic hash you can use to redeem your digital gold nugget.”
