Docker: How to download & verify a publisher’s root key (out-of-band, distinct-domain cryptographic verification, WoT)

For a given publisher of docker images on Docker Hub (let’s say debian), how do I download their root release/image signing key and verify its authenticity from multiple sources out-of-band from each-other?
Though it doesn’t appear to be c… Continue reading Docker: How to download & verify a publisher’s root key (out-of-band, distinct-domain cryptographic verification, WoT)