In the 1930s, the state of the art celestial body finder was the blink comparator, which is how astronomers looked for subtle changes between images in the days before CCD cameras and digital image processing. We present a novel open-source mobile client and network service which can protect arbitrary hardware from many forms of covert modification and attack, and which when integrated with software, software, firmware, and policy defenses, can provide greater protection to users and limit potential attack surface. The idea is simple, even though it sounds complicated when described in generic terms.”]