Aight
All worked well, ran pacman -Syy and then
sudo pacman -S manjaro-keyring archlinux-keyring
warning: manjaro-keyring-20220514-1 is up to date -- reinstalling
warning: archlinux-keyring-20220424-1 is up to date -- reinstalling
resolving dependencies...
looking for conflicting packages...
Packages (2) archlinux-keyring-20220424-1 manjaro-keyring-20220514-1
Total Download Size: 1.03 MiB
Total Installed Size: 1.54 MiB
Net Upgrade Size: 1.46 MiB
:: Proceed with installation? [Y/n]
:: Retrieving packages...
archlinux-keyring-20220424-1-any 1051.1 KiB 5.61 MiB/s 00:00 [#####################################################] 100%
(2/2) checking keys in keyring [#####################################################] 100%
downloading required keys...
:: Import PGP key 6D42BDD116E0068F, "Christian Hesse <eworm@archlinux.org>"? [Y/n]
(2/2) checking package integrity [#####################################################] 100%
error: archlinux-keyring: signature from "Christian Hesse <eworm@archlinux.org>" is unknown trust
:: File /var/cache/pacman/pkg/archlinux-keyring-20220424-1-any.pkg.tar.zst is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n]
error: failed to commit transaction (invalid or corrupted package (PGP signature))
Errors occurred, no packages were upgraded.