Not really sure where they sourced it. Could just be all the bitcoin circulating out of GBTC - very possible. Not sure if Bitcoin held in a trust for a vehicle that is also converting to and ETF is permissible. Thats said, seems like GBTC is just milking their vehicle and fees and not interested in competing on low fees, so maybe they just accepted their fate and knew Capital would rotate out so collected on the fees? Possible I guess.