ZK-gossip for lightning channel announcements

[halseth]

@AdamISZ

But of course this thread is about @halseth 's scheme with zkSTARKs so I’ll stop talking about an alternative idea, here (there is another thread about that!).

It would be great to chat and discuss the various alternatives (STARKs, SNARKs, Curve Trees, ring sigs) and how we could use them to get to the goals we aim for (verification time, proof size, crypto maturity) for the scheme to be practical