After an hour of questions, Harris thanked the small crowd and was promptly accosted by a tall man and a woman in red who wanted to buy some MazaCoin, which Harris was selling for 10 cents apiece. The two trailed him around the room as he hunted for a printer so he could issue the digital currency on paper. MazaCoin is a month-old cryptocurrency based on the same proof-of-work algorithm as Bitcoin, the virtual currency that approximates cash on the internet —but no one in the room was equipped to made a digital trade.

There have been a slew of copycats since the rise of Bitcoin in 2009. The first wave attempted to improve on the basic Bitcoin protocol. The second wave, which includes the meme-based Dogecoin and the Icelandic Auroracoin, are catering to specific groups.