Although I get and partially understand this, it's also a tricky thing to rely on: at some point you should decide those things on your own, and stand by your decision.

Let's try a side story: Let's say I made a deposit, saved the Letter of Guarantee, and got the note's private key. I safely stored the private key offline.
Then, my computer got compromised, and someone gained access to my empty wallet and the LoG. That person now has the same information stormbounty has, right? He can sign a message from the address used to deposit, and thus prove that "he" paid the address in the LoG. If that's the case, he should not get the money that belongs to my note to which I have the private key. If I'd come back 2 years later and see the money's gone, you'll get a scam accusation.

Disclaimer: this post includes some assumptions because I still haven't tested your site by myself.

People should really learn to keep the private keys safe. That's all that matters in crypto, if you lose your private key, your money is gone. If it's Bitcoin, it's a donation to everyone. If it's Binance's made-up wrapped Bitcoin, it's a donation to CZ. If it's WWM, it should be waiting for you until the end of time.