don’t know if this is of any help to anyone except maybe past me, but i had a hard time finding the correct Public Key to verify the current Krita AppImage: So what finally worked was gpg -- this Public Key here https://files.kde.org/krita/dmitry_kazakov.gpg and gpg --verify krita-5.2.9-x86_64.AppImage.sig then gpg says Good signature (fingerprint: E9FB 29E7 4ADE ACC5 E303 5B8A B69E B4CF 7468 332F). Anyway (>’ v ')> here is a drawing i made using my laptops wonky touchpad.
KOOL
Why would you sign it?
Ah i meant i downloaded the signature from download.kde.org/stable/krita/5.2.9/, just wanted to make sure that the Krita AppImage i had was legitimate
Look at the properties of the file in dolphin. It will show you various file signatures.