Earlier quoted context omitted.
How do you know if I have enough assets? I'm just some random finance source. Sorry, this isn't how it works. To transfer to another bank the banks will adjust central bank balances. Look up how ACH works behind the scenes, or the equivalent in other jurisdictions. As for "centuries", again, no. Clearing houses - look them up. In general - if something sounds magical in finance, you have to dig deeper. There is no ma…
"How do you know if I have enough assets? I'm just some random finance source." You have enough assets because you've just created a loan of precisely that amount secured against physical collateral. That's the asset. Therefore I can take over the deposit you have created knowing I can claim against that collateral in the final analysis. And therefore I can create a deposit for my customer of the same amount. That's…
I can make an unsecured line of credit available to you, and until you try to draw on it, you don't know if I have the ability to fund it. Same problem if the loan is supposed to be secured by your car. There is no magic you can come up with that changes that. Now if you are smart, you'll have done some diligence on me, and I might have a credit rating you can look up. Or someone in your org might be tasked with analyzing the credit and liquidity risks of all their counterparts. If it worked like magic, no one would bother doing this... but they do.
Correspondent banking makes up a tiny percentage of bank to bank settlements. "merely collateral optimization" makes the central bank role sound almost meaningless. Having credit risk and liquidity problems is kind of a big deal.
As for the comments on what the central bank is doing - it doesn't change the fact that banks can't make money out of thin air. If you look at the link above/below for WFC's balance sheet - every asset on their books is funded by real liabilities (plus some equity).