I publish my OTR public key fingerprint on the front page of my website, which is it's self signed using my private PGP key. On that same page, I provide links to DDG searches of my fingerprints so people can see the multitude of places that it has been indexed. It gets indexed in a lot of places because I am active on several public mailing lists and the fingerprint is included in the signature of all my emails. All of my emails are signed using the same PGP key as the front page of my website.

https://grepular.com/

EDIT: I just remembered, my HN profile also contains my OTR fingerprint, and is signed using my PGP key.