This is only true if the person looking at the repo doesn't have a copy of your ...

cyphar on Aug 15, 2016 | parent | context | favorite | on: Setup Keybase.io, GPG and Git to sign commits on G...

This is only true if the person looking at the repo doesn't have a copy of your key locally. It's important to remember that all of these tools work offline and don't require some web 2.0 service to operate. :P