create next-generation v3 hidden service keys
Prop 224, the next generation hidden services have been merged into tor upstream and are now in nightly builds. Tor browser is likely to release with support for these in less than a week and the stable release will be out in the next couple of months (scheduled for mid-december, and they are usually on time).
Right now we are generating with leap cli the hidden service keys for v2 addresses. It should not be hard to generate the v3 addresses now as well. The details are here: https://gitweb.torproject.org/torspec.git/tree/rend-spec-v3.txt#n2011
the "PUBKEY" is ed25519 pub key.
David Goulet said that to create the file in the format that tor expects it is very easy, and @elijah can just ping him if he has issues.