Re the twins, the application talks about the issue price being a weighted average across exchanges on a particular date (27th June is stated, but I think it is for example purposes and subject to change) ... this would imply that they are backing it with their own coins to me. Trying to read thru it while watching this at the same time
It's a good read in terms of 'risk factors' ... they do a good job of explaining the pros and cons of BTC.
So far to me it sounds like they want to sell paper backed by their coins and earn a fee for managing the ETF ... that there is a fee is explicitly stated ... size of basket will go down due to fees etc.
Well, look on the bright side, at least they are not selling them now on the exchange !
Also states they want to create the trust as soon as possible ... that, to me, does not imply that they are planning to buy 200,000 BTC to back it - that would be a ludicrous proposition.