BlackRock has amended their Bitcoin ETF agreement with Coinbase to require Coinbase to allow withdrawals within 12 hours. This amendment helps BlackRock improve liquidity and helps verify that Coinbase actually has used BlackRock funds to purchase bitcoin. If only there was another easy way to do this... You know, such as publishing a publicly verifiable bitcoin address!
The entire concept of an ETF contradicts the principles of trustless Bitcoin, which requires no intermediaries.
We had the concept of provable reserves for years. Kraken uses it.
i believe only one ETF does this. - Bitwise.