Last December, I wrote that Fortress Investment Group was preparing to launch a fund that would buy and hold Bitcoin. I also wrote that while details were scarce," there was "some relationship to a new Bitcoin-related fund raised by Pantera Capital, a San Francisco-based hedge fund whose clients are known to include several Fortress executives." Here is what I now know: Fortress has invested directly in Pantera Bitcoin Partners, the limited liability company overseeing Pantera's Bitcoin fund. Moreover, all future purchases of Bitcoin or other crytpocurrencies by Fortress and its principals will be made via Pantera. In other words, there...