https://spec.torproject.org/proposals/361-oasic.html This proposal describes Onion Association standardization, authenticated by TLS certificates. It specifies how this association is encoded in the certificate's Subject Alternative Name (SAN) field, providing meaningful SAN-based Onion Association authentication. This proposal was written by Paul Syverson, I'm announcing it on his behalf. Feel free to open tickets on gitlab, discuss here, or also on the Tor Forum. -- Micah Anderson (he/him) Director of Engineering The Tor Project, Inc. <https://torproject.org>