Yes, this was kinda a merge between txauth and oauth.xyz; the design group had authors from both projects in there.

Here's the place to check it out going forward: https://datatracker.ietf.org/wg/gnap/about/

And here's the draft just promoted to the WG: https://datatracker.ietf.org/doc/draft-ietf-gnap-core-protoc...