Same issue: I ran the commands and get the following related to Brave and Fedora (google left out)
gpg-pubkey-cfc659b9-5b6eac67 gpg(Fedora (30) [email protected])
gpg-pubkey-c2d4e821-5d13a788 gpg(Brave Software [email protected])
gpg-pubkey-3c3359c4-5c6ae44d Fedora (31) [email protected] public key