Now Playing: 06-27-14 Marketplace Tech - Bitcoins at auction

With the U.S. Marshal’s office auctioning off bitcoin seized in its Silk Road investigation, we take a look at what it means when the U.S. government starts trading in the virtual currency. Plus, how well have you kept up with the week in tech? It's time for Silicon Tally, our quiz on tech news from the week. Host Ben Ben Johnson takes on Jim Garrison, founder of Garrison Architects, in his post-disaster urban housing prototype in Brooklyn.