I can't access any keyservers from here. So, what's the public key to check the ISO's file integrity?
I suggest to use Ubuntu keyserver (https://keyserver.ubuntu.com/). It's pretty stable to access from here.
The iso downloads (https://iso.artixlinux.org/isos.php) page has a pgp signatures section at the bottom where you can download the corresponding key for a given iso.
No, I mean the public key to imported to Kleopatra, not the .sig files.
artixlinux.org/download.php (https://artixlinux.org/download.php#:~:text=The%20official%20ISOs%20below%20are%20signed%20with%20PGP%20key%200xB886B428.):
(I don’t include the link in the quote just so that I can’t give you a wrong link.)