you don't have one!
it's a nip05 verification.
there are plenty of free and paid services out there. if you wanna use mine (nostrich.cc) then just send me a DM and I explain more..
Discussion
I did send you a PM, also nostr:npub1qm7ny6seuv3h3ahnu96pyj7kc67ms8u3uce8p76433jd9ngr6qzsmtvlmk did (which is my service for nip05 identifiers).