Every Monday night, a Manhattan Whole Foods fills with a unique breed of "buy-local" enthusiasts. They're not there for the Brooklyn-made pickles or the Westchester apples. They come because they want to buy and sell bitcoins.

The gathering is called Satoshi Square after Satoshi Nakamoto, the pseudonym for the mysterious person or organization that created the digital currency in 2009.  Reporter Audrey Quinn visits the exchange as attendees trade bitcoins for cash. Face-to-face trading seems counter to the anonymity usually associated with bitcoins, but Satoshi Square regulars say in-person bitcoin exchanges actually bring them closer to the true nature of the currency.