o update the keys (every year, before 1 March) for Arch:

osc signkey --extend home:Ximi1970
osc rebuild home:Ximi1970 --all
osc rebuild home:Ximi1970:Mozilla:Add-ons --all
osc rebuild home:Ximi1970:Mozilla:Add-ons:SysTray-X:0.9.xx --all

Check key:

wget -q https://download.opensuse.org/repositories/home:/Ximi1970/xUbuntu_22.04/Release.key
gpg --show-keys Release.key

Arch:

gpg --dearmor home_Ximi1970_Arch.key

gpg --keyring /home/xxxx/home_Ximi1970_Arch.key.gpg --verify systray-x-xxxx.pkg.tar.zst.sig systray-x-xxxx.pkg.tar.zst