The SeedSigner verification steps are pretty boilerplate.

https://seedsigner.com/quick-installation/

Basically you need 4 pieces of information

• The file that you are verifying
• The hash of the file
• The sigature against the hash
• The software publisher's PGP Public Key

Usually the signature and hash(es) will be in a standard format that allows you to boil verification down to teo steps

1. Import the public to your keychain
2. Run the verify gpg subcommand