If I understand right, in your proposal everybody needs to convince one or more gateways (who have HTTPS / ICANN domains) to host for them.
I gather the identities of the gateways are transmitted when a message from the actor is transmitted. And as long as you don't change ALL of your gateways at once, the learned information remains valid for responding.
If I'm not mistaken, you cannot just tag @[email protected] and have that work, unless you've seen some message from them before which provides their gateways...
Actually on second thought, I suppose names *cannot* be @[email protected] because there's no way to verify someone isn't lying about owning instance.tld, so names need to be key-like, like names in Nostr (?)
