Is this a function of UCP?

= This is a function of UCP, as it integrates with Docker Trusted Registry (DTR) to provide built-in security and access control for your images. DTR allows you to enforce security policies and only allow running applications that use Docker images you know and trust. You can sign your images with Docker Content Trust (DCT) to prove their authenticity and integrity. UCP will verify the signatures of the images before deploying them to the cluster12. References:

Universal Control Plane overview | dockerlabs

How to Sign Your Docker Images to Increase Trust - How-To Geek