gpg --verify-files *-CHECKSUM
gpg: Signature made Fri 25 Oct 2019 03:09:09 PM CEST
gpg: using RSA key 50CB390B3C3359C4
gpg: Can't check signature: No public key
gpg: Signature made Fri 25 Oct 2019 03:09:42 PM CEST
gpg: using RSA key 50CB390B3C3359C4
gpg: Can't check signature: No public key
gpg: Signature made Fri 25 Oct 2019 03:09:48 PM CEST
gpg: using RSA key 50CB390B3C3359C4
gpg: Can't check signature: No public key
curl
https://getfedora.org/static/fedora.gpg | gpg --import
does not fetch public key.
AV