Off topic, but re: Perspectives. It allows your browser to compare notes with other nodes on the Internet ('network notaries') to ensure that everyone is seein

Off topic, but re: Perspectives. It allows your browser to compare notes with other nodes on the Internet ('network notaries') to ensure that everyone is seeing the same cert for a given website. Looks like a great idea, but how do they prevent the man-in-the-middle from impersonating a network notary?