I ran into this error
error: archzfs: signature from "ArchZFS Bot <firstname.lastname@example.org>" is unknown trust on multiple machines over the last days.
Since one machine was working which is also running one of my dns servers, I was searching into this direction.
After a while, I switched all my machines using this one dns server without fixing the real issue.
Furthermore, by just trying to refresh keys with
sudo pacman-key --refresh-keys, I ran into another error:
gpg: WARNING: Tor is not running.
I could solve this with a one liner:
echo "no-use-tor" >> ~/.gnupg/dirmngr.conf
Next step was finally to delete the broken key and re-import ist again.
sudo pacman-key -d DDF7DB817396A49B2A2723F7403BD972F75D9D76 sudo pacman-key -r DDF7DB817396A49B2A2723F7403BD972F75D9D76 sudo pacman-key --lsign-key DDF7DB817396A49B2A2723F7403BD972F75D9D76
After running through all this steps, I was able to run a system update again with pacman.