I'm writing an article about the future of Healthcare. I wondered if it was possible to use Monero to make a proof of funds. For example: the hospital wants to know that I can pay for the medical care I'm going to receive, I sign some kind of message that proves that I own at least x amount of XMR, they are convinced and I get treated with no delay.
Is that possible? I understand that range proofs do precisely that, the question then becomes: is it possible for an owner of XMR to create this proof without deanonymizing his account? Note that I do not want to make an on-chain transaction, it should just be some kind of signed message. If the answer is yes, then I will mention Monero in the article.