I like it how limited your understanding of the world is.
Bitcoin gives you ownership of a Bitcoin, it's that simple. You hold BTC, you hold the value in your hand, just like when you're holding a piece of valuable art. You know that some people are willing to pay a lot of money for it and that's it. One day that piece of art may be worth nothing just because you won't be able to find people willing to buy it, even though everyone knows that it used to be valued at 1000 USD for instance. That's the risk each of us has to take every day.
Bonds don't give you the right to a payment. They give you a promise of a payment, which is much different. Promises can be broken.