GnuPG Keyrings for AlterLinux.
gpg --keyserver keyserver.ubuntu.com --recv-key F50544048389DA36
git clone https://github.com/FascodeNet/alterlinux-pkgbuilds.git
cd alterlinux-pkgbuilds/alter-stable/any/alterlinux-keyring
makepkg -s
sudo pacman -U alterlinux-keyring*.pkg.tar*