If this is news to people, then: similar to https://github.com/${USER}.keys https://github.com/${USER}.keys, there is https://github.com/${USER}.gpg https://git

If this is news to people, then: similar to https://github.com/${USER}.keys https://github.com/${USER}.keys, there is https://github.com/${USER}.gpg https://github.com/${USER}.gpg that gets you to GPG key of a user. Not sure how you can get more than one key, in any of these cases.