Sapan Shah started accepting the virtual currency Bitcoin at his Subway franchise in the Philadelphia suburb of Allentown in November. During the ride we spoke about the potential Bitcoin had to completely revolutionize global commerce and finance, which only heightened the anticipation to make our first purchase, he wrote in a blog post titled I Bought Subway with Bitcoin and It Was Awesome. The virtual currency, which approximates cash on the internet, now powers an economy worth around $7 billion. That means anyone who does gets a bit of extra attention from virtual currency fans — and the press.