My guess is that "QDXTrusted Quantum Dot Physical Key" exists only in the minds of a couple folks on the two QMC boards, and none of them can explain what they mean by it or how it might work.
I think there are going to be a couple very disappointed folks here when they see just how run-of-the-mill the blockchain and cryptography parts of the QMC products turn out to be. The magic is going to be in the tagging not some new level of data security.