The oci: transport — an OCI image-layout directory.

Layout (image-spec): an oci-layout marker, a top-level index.json mapping tags to manifest descriptors, and content-addressed blobs under blobs/<algo>/<hex>. Manifests are themselves stored as blobs; index.json records each with an org.opencontainers.image.ref.name annotation for its tag. Blob I/O goes through Stevedore.Store.Local, whose layout matches.

Spec: OCI image-layout.