Nostr JSON is extremely complicated, in wide angle. Devs often have comically little understanding of how the world looks to non devs, it's become a meme, and you're proving out the meme a little here.
Just to understand what a signature is, that a very big thing to normies. Try explain how public key cryptography works to someone who's never every consider what it is and what it does. And then explain what a hash is after that.
Without that it's a just a meaningless little markup file.
Devs will often give up and say "okay all you need to know is it's a kind of digital signature" and other mush that just makes it worse and not better, since cryptographic signatures are not at all analogous to real-world signatures, and since cryptographic keys are also not at all analogous to real world keys. And anyway keys don't even sign things in the real world, keys open things.
