Translations:How-to verify GPG key of official .ISO images/7/en
From Manjaro
4. Finally, verify if the .iso image file was built by the Manjaro Build Server, Philip Müller or one of the other Manjaro Developers:
gpg --verify manjaro-ISO-image.iso.sig manjaro-ISO-image.iso
Compare the key which was used to sign the .iso file with the corresponding developer key.