Is Notary signing enabled for alpine-node images?

[danarcari]

When attempting notary -s https://notary.docker.io -d ~/.docker/trust/ list docker.io/library/mhart/alpine-node to view signatures for alpine-node images from DockerHub, the CLI requests a username/password. Anonymous credentials are not supported, resulting in a 401.

Are the alpine-node images produced with Docker trust enabled? If so, can the signatures be uploaded to notary.docker.io so we can use these in a trust-enabled build chain?

Thanks