Logic locking is a way to secure silicon chips against supply chain attacks. We wrote a Yosys plugin, Moosic, to apply logic locking solutions easily using a fully open source toolchain.
This is a showcase design to show how to apply logic locking on a simple example. It uses TinyTapeout to go all the way to a silicon chip! Have a look at the blog post on the YosysHQ blog for more information.