@prologic@twtxt.net Web Key Directory: a way to self host your public key. instead of using a central system like pgp.mit.net or OpenPGP.org you have your key on a server you own.

it takes an email@address.com hashes the part before the @ and turns it into [openpgpkey.]address.com/.well-known/openpgpkey[/address.com]/<hash>