Pubkeys and message signing? 🤔
Discussion
How does it related to the ETF?!
I have almost no knowledge of etfs. But I would expect that there could be such information about the etfs custody concept
I mean you will at least see that they buy and sell btc ... they can still rug pull you
You can do proof of reserve like that anywhere. Etf, exchanges. It's just that users have to care enough so it's built. Of course theoretically in bad juristictions the can loan it out or borrow for proof of funds, but that wouldn't survive any legal scrutiny especially for things as highly regulated as ETFs.
With options trading that might get a bit different though not sure.