Verifying a file's cryptographic signature can deduce its origin or trustability. Unfortunately on OS X there is no simple way to view a file's signature from the UI.
WhatsYourSign adds a menu item to Finder.app. Simply right-, or control-click on any file to display its cryptographic signing information!
Full details and usage instructions can be found here.
https://github.com/objective-see/WhatsYourSign
Patrick Wardle - Objective-See