[epic]: Gossip 1.75

[ellemouton]

This issue will be used to track the progress of spec proposal and LND implementation of Gossip 1.75.

Useful Links

• Draft spec proposal: extension-bolt: taproot gossip (features 32/33) lightning/bolts#1059

PRs

• channeldb+refactor: remove kvdb.Backend from channel DB schemas #8117
• [1/7] lnwire: add new Gossip 1.75 messages #8044
• [2/7] channeldb: add new types and interfaces for gossip 1.75 #8164
• [3/7] multi: start using the new interfaces throughout the codebase #8252
• [4/7] multi: continue threading the new interfaces #8253
• [5/7]: multi: thread ChannelUpdate through codebase #8254
• [6/7]: discovery: sync gossip using block heights & ranges #8255
• [7/7] g175: funding, feature bit & itests #8256

Draft impl:

If you want to get a view of what the big picture changes look like, check out: #8185

Plan

• Spend some time understanding how LND handles Gossip today
• Update the spec proposal with the latest updates
• Flesh out: Handling of old & new gossip messages (ie, when does it make sense to stop sending old node announcement etc)
• add new lnwire messages
• Flesh out: nonce generation for announcement_sigs_2
• Flesh out gossip query updates
• Code for handling new received channel_announcement_2
• Code for handling new received channel_update_2
• Code for handling new received node_announcement_2
• Code for creating new node_announcement_2
• Code for creating new channel_announcement_2 in the funding manager
• Code for creating new channel_update
• Update code for handling gossip queries