If Google's VPN used Tornado Cash's protocol, they wouldn't be able to take the proof of having a session key back to Zinc to determine who asked for that to be

If Google's VPN used Tornado Cash's protocol, they wouldn't be able to take the proof of having a session key back to Zinc to determine who asked for that to be signed. (if we assume Zinc is malicious) The protocol used looks like it was to provide anonymity with third parties, but not anonymity to the first parties. Google also links to the paper from 1982 that they're referencing. [1] [1] https://www.hit.bme.hu/~buttyan/courses/BMEVIHIM219/2009/Chaum.BlindSigForPayment.1982.PDF https://www.hit.bme.hu/~buttyan/courses/BMEVIHIM219/2009/Cha...