Proposal to combine HSDir and IP in next-gen hidden services
This ticket exists to track the scheme[1] to remove HSDirs along with proposal 224, by combining their behavior with the introduction point.
The broad overview is that the client would choose an IP using the same algorithm proposed for choosing a HSDir, build a circuit, and ask for a "descriptor" containing metadata and the IP encryption key. The client then sends INTRODUCE1 over the same circuit, and from there proceeds as already proposed.
See the tor-dev thread for some prior discussion on the tradeoffs. I have tasked myself with writing some real text for this based on proposal 224.
[1] https://lists.torproject.org/pipermail/tor-dev/2015-April/008743.html