Not sure. I guess it is whatever is agreed between coinbase and blackrock but he seemed to imply they get settled as soon as trades between blackrock and authorized participants settle.
Here is what he said about that part.
It's: (a) get creation order (b) borrow cash in form of trade credits (c) buy bitcoin (d) exchange cash for btc (e) btc settles into trading balance (offchain).
In a regular end-of-day sweep process, the bitcoin that was acquired in the step above gets transferred from the trading account to the "Vault Balance."
^^ this transaction is on-chain ^^ remember: transactions from the Prime entity to the Custody entity are onchain.
Once the AP that started the process delivers cash to the ETF (which I believe happens on T+1 but we'd need to ask Blackrock to be sure, could be T2) IBIT takes the cash & repays the loan to Coinbase (cash in the form of trade credits) and that leg of the txn is complete.
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