Bloomberg senior ETF analyst Eric Balchunas revealed on the X platform that BlackRock operates its own blockchain nodes, extracting Bitcoin balances from CEX's wallet address every night to verify the Bitcoins held by IBIT. If institutional clients request it, they will display this data, but they will not make it public to the world because they have already received a large amount of spam (such as sanctioned Bitcoins and NFTs), and making this information public would only lead to a surge in spam.
Balchunas said: "What needs to be known is that this is definitely not amateur behavior. BlackRock manages about 500 ETFs, all of which are kept by custodians and there has been no problem for decades. This is also why they and other ETF issuers are so trusted by U.S advisors."