Nostr has beein doing this with Nip05 for a little over a year now. They just use a json file in the .well-known directory of the domain that contains your publ

Nostr has beein doing this with Nip05 for a little over a year now. They just use a json file in the .well-known directory of the domain that contains your public key. https://github.com/nostr-protocol/nips/blob/master/05.md https://github.com/nostr-protocol/nips/blob/master/05.md