You hold nothing If this money not backed by something real or atleast with cash.
The BONDS treasuries not something for sure but they are more like coupons wich show's how good situation the goverment and other people are to keep value of money.
I told my own bank show me stablecoins, cash,or cryptocurrency or gold equlaint with money i have otherwise i own only numbers wich doesn't mean anything just the numbers on screen.
It's mature way to look finances i don't want to my wealth backed by bonds coupons it's speculative and we never know If they keep holding any value at all.
I stay my point: something i can hold in my hand or private wallet that's real wealth and the wealth i can count on.
The reality is that the money you supposedly have at your local bank are just numbers and nothing else, since your bank could always refuse to give that money that belongs to you using any legal excuse, something I have seen happening before to other people, so I only keep the minimal amount there to pay for my bills and everything else is withdrawn as soon as it arrives and I keep it in the form of cash or I invest it in this market.