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.
You have so much to learn, but instead of learning you keep on coming here to spout nonsense. There is nothing mature about the way you look at finance if holding cash is your master plan. Cash is trash quite frankly and it is losing value over time so you need it in a saving account at a minimum or invested in assets that are productive, like shares in a company or an index fund. What are you going to do when there is a freak accident and your house burns down with your bundles of (imaginary) cash inside it? The banks have many redundant systems to keep track of the funds and the central governments of most countries now give a guarantee to back all funds up to a certain limit inside banks, in order to avoid bank runs which can be harmful.