I know this has been mentioned before but it requires putting a private key on an online server that could compromise everything.

There's then the other prospect of how many letters will people check? A 1Chip or even 1Chipmix address would be crackable without much computation power afaik. So you'd need to find an address with another word in it imo which would probably be hard to find.

Also, if you keep a copy of your receipt, you keep a copy of what you've just tried to destroy. Deleting information you've downloaded or saved is fairly difficult to do (and make it irrecoverable) even in memory there's no guarantee that your data will delete once the session clears or after a certain amount of time on a lot of devices.