On a Github it says
pub rsa4096 2016-06-25 [SC]
4B1F400DF25651B53C4141B38B3F30F9C8C0C2EF
uid [ unknown] unman (Qubes OS signing key) unman@thirdeyesecurity.org
sub rsa4096 2016-06-27 [S] [expires: 2027-06-30]
sub rsa4096 2016-06-25 [E]
?
I asked about it recently