[staticassertion]

> How does the site know the user's OS is patched? The User Agent?

User agent is a great place for a version 0, sure. 99% of your assets aren't compromised, so worrying about a bypass isn't important to most of them. For a v0 just knowing that most of your boxes are patched is a huge win.

Of course you'll want client certificates on devices, or some sort of TPM, which is how Chromebooks work. The attacker having a box is not enough - identity is a key principal of zero trust networks.