[al2o3cr]

    And then instances of Brave and any other browser
    implementing this protocol could easily be
    cryptographically confirmed to the ad network.

Nevermind adtech, if they've invented tamper-proof remote attestation they should just start selling THAT.

Otherwise, the botnets will all be running code that says "YEP DEFINITELY LEGIT U CAN TRUST ME" on every request.