Blake Benthall, the alleged operator of Silk Road 2.0, has been arrested and charged in a Manhattan federal court.
John Law delves into Bitcoin secrecy and subpoenas, Bloomberg's bitcoin ticker, and Casascius coin hacking at Defcon.
The Casascius coin was shown to be vulnerable to physical attack at this year's Defcon conference.
The Defcon hacker conference saw bitcoin being sold via a briefcase, where loose change was exchanged for QR codes.