Bitcoin is the original cryptocurrency gaining in popularity. It has no central point of authority, and nothing backing its redemption. Here are a few informative videos:
How does Bitcoin work?
What are the qualities of a good currency?
Bitcoin vs. the Federal Reserve:
Now, what are some of the economic concerns? Could bitcoin go mainstream, or is it likely to just remain a component of black market transaction? Since there is no central authority, it could never be used to affect monetary policy. Is having a digital 'gold standard' better than a central fiat currency? What about legal tender laws? Also, bitcoin will not be inflationary within a few decades; is that a good for growth, or is it likely to end in failure?
Also, I have a small amount of bitcoin I would be willing to share. If anyone brings a bitcoin wallet to SWEET, I would be happy to get them set up with some bitcoin and start transacting!