I could not personally because I don't care to. But a blockchain address is like any other piece of metadata: once associated with you, it's no longer anonymous

I could not personally because I don't care to. But a blockchain address is like any other piece of metadata: once associated with you, it's no longer anonymous. You can create another one easily. And I actually think that last part (lightweight account creation) may be what the banks are after here. It allows them to obfuscate transactions on the wire by using one-time accounts so that other banks not involved in the transaction know who is transmitting what from looking at the blockchain -- while at the same time providing enough transparency and security that banks can independently validate transactions they were involved in.