- account proving
Ah! I don’t want to usurp your site 
But it would seem normal to be able to prove that an account (not a site) is yours.
-
keybase public folder
very easy to use. I surely switch to that after test. -
Signature
Inside the zip file there is already a xxx.exe.asc file ti sign the corresponding exe file.
What is done behind the scene by keybase is still mysterious for me but it is very easy to set up and use.
Thanks