Who said the keys need to be long lived in WKD? WKD just makes the key discovery easier based on email address, you can rotate your key as often as you want (just set the expiry date so clients check it).
Also, I'm not sure if I get the "public ledger" part as WKD I just your own HTTPS server. It doesn't have anything in common with keyservers.
Also, I'm not sure if I get the "public ledger" part as WKD I just your own HTTPS server. It doesn't have anything in common with keyservers.