Eugene Aono, a spokesperson for BMEX bitcoin exchange, holds a receipt displaying a quick response (QR) code for a photograph while demonstrating usage of the company's Robocoin-branded automated teller machine (ATM) at The Pink Cow restaurant and bar in Tokyo, Japan, on Wednesday, June 18, 2014. Bitcoin, proposed by an anonymous programmer or programmers in 2008, has drawn entrepreneurs and retailers looking to popularize it as a low-cost alternative to established payment systems, supplanting credit cards to international wire transfers. Photographer: Yuriko Nakao/Bloomberg via Getty Images
