Well there is a sort of indicator. When you link to your sites if you use the link verification system (linkback) then it will add a check mark verifying you are the owner of the site, and thus your identity.
keybase.io allows for this as well just dont get a "mark" or indicator except on the keybase homepage itself.
Thats pretty much the entire purpose of keybase, to verify identities across different websites.
@freemo @yang I do think some people need some kind of indicator for their official handles.
But, I am inbetween at verifying people. As an open source program, best practice is to keep curation as low as possible.