Thanks! And ya, we found the spec! We are in the middle of adding a feature to help devsecops teams notice when org.opencontainers.image.revision and org.opencontainers.image.source labels are missing (those were the first two which we considered mandatory to ensure that downstream admission controllers can validate checks that are indexed by sha). I had not realized that you were proposing further annotations for base images here. That sounds really promising. I think having a standard set of information available in the images is critical.