Measure is a public page that checks the 16 computers that hold NEAR's chain-signature keys. It says whether each one is running the software NEAR published, and whether Intel's signature on that computer's quote checks.
The chain stores only a short summary of each machine. The Intel quote, the actual evidence, is buried in an old transaction. Measure pulls that quote back out and checks it on your machine. It does not ask NEAR's own checker. It does not hold a key, sign, or spend.
Loops House