Good morning Jon, In addition to fingerprint correlation and AS choice, I also recall reading this paper about identifying hidden services using clock skew based on internal CPU temperature: https://murdoch.is/papers/ccs06hotornot.pdf . The paper is older, but I'm curious if such an attack method is still effective? Make your day great, Isaac Grover, Senior I.T. Consultant Aileron I.T. - " Because #ProactiveIsBetter " O: 715-377-0440<tel:715-425-0440>, F:715-690-1029<tel:715-690-1029>, W: www.aileronit.com<http://www.aileronit.com/> LinkedIn: https://www.linkedin.com/in/IsaacGrover/ YouTube: https://www.youtube.com/channel/UCqrwZNFKdR-guKtuQzFPObQ