For nm.debian.org, at 2021-08-10:
For the past 20 months or so, I have worked with Dennis Braun on plenty of packages
maintained by the multimedia team.
For this past work, Dennis Braun 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 3CB7 C302 AFB5 7E61 A8C6 17DD 634E A55D 902B 9836.
I've made sure that they are able to decrypt encrypted messages sent to this key
and that they're able to sign messages with the same key.
Due to the long-term interactions we had, I'm convinced that Dennis Braun as they
present themselves on nm.debian.org is the rightful owner of both email
firstname.lastname@example.org and GPG key 3CB7 C302 AFB5 7E61 A8C6 17DD 634E A55D 902B 9836.