Use your PGP keys from your Yubikey
Authenticity is a psychological and philosophical concept. According to existential philosophy, the lack of authenticity is a sign of lack of trustworthiness. We should not only be authentic in what we do, but also in what we produce. In early 2021, a software was reported to have malicious code introduced through changes made by well known developers. In this particular case, the changes were noticed in time, but that was rather lucky.