Paul Kemp-Robertson: Bitcoin. Sweat. Tide. Meet the future of branded currency.

Currency -- the bills and coins you carry in your wallet and in your bank account -- is founded on marketing, on the belief that banks and governments are trustworthy. Now, Paul Kemp-Robertson walks us through a new generation of currency, supported by that same marketing ... but on behalf of a private brand. From Nike Sweat Points to bottles of...