For nm.debian.org, at 2022-01-03:
For the past 3 months, I have worked with Mathias Gibbens on packages for the Go
packaging team related to his work on getting LXD on the archive (see #768073).
For this past work, Mathias Gibbens sent mails using the email address email@example.com
which is the one they're using on nm.debian.org, and they signed their work and
email using a GPG key with fingerprint 0A34 55B7 CCDE 5C53 4374 7321 C0BA 812C 6C4D CB2E.
Due to the long-term interactions we had, I'm convinced that Mathias Gibbens as they
present themselves on nm.debian.org is the rightful owner of both email
firstname.lastname@example.org and GPG key 0A34 55B7 CCDE 5C53 4374 7321 C0BA 812C 6C4D CB2E.