My point is that at least they make the 1st step in proof of reserve that will force Blackrock to also do. The correctness you guys are argueing about are somewhat important but not urgent. Saying these types of addresses are bad is also saying Bitcoin is bad. Again the Satoshi coin are all publicly available to see from similar addresses and never got hack for 15years now so what's your point? Yes they need to upgrade to multisig but when they feel confortable with it, you have to remimber multisig is also complex and more likely to lose the wallet backup and keys therefore lose all the coin together.