Lightning Specification Meeting 2022/05/23

[t-bast]

The meeting will take place on Monday 2022/05/23 at 8pm UTC (5:30am Adelaide time) on Libera Chat IRC #lightning-dev. It is open to the public.

A video link is available for higher bandwidth communication: https://meet.jit.si/Lightning-Spec-Meeting

Pull Request Review

• Clarify coop close requirements BOLT#02: clarify coop close requirements #970
• Hold htlcs before forwarding Add the ability to hold HTLCs before forwarding (FEAT 52/53) #989
• Route blinding Route Blinding (Feature 24/25) #765
• Onion messages BOLT 7: Onion message support (features 38/39) #759
• Offers Offers #798
• Add dust exposure threshold Add a max_dust_htlc_exposure_msat #919
• Port conventions for different networks BOLT 1: introduce port convention for different network #968

Waiting for interop

• Handle update_fee during shutdown BOLT 2: forget the check about update_* messages, and check what must not happens during shutdown #972
• Graph dump on gossip_timestamp_filter Inconsistent behavior around graph dump on gossip_timestamp_filter. #980
• Simple turbo channels enablement Explicitly allow funding_locked early, and support alias scids (feat 46/47/50/51) #910
• Dual funding interactive-tx: Add dual-funding flow, using the interactive tx protocol (feature 28/29) #851
• Websocket transport websocket address type: allow transport over RFC6455 #891
• Don't force close until error is received after channel_reestablish Nodes shouldn't publish their commitment when receiving outdated channel_reestablish #934
• Dynamic DNS support in gossip messages BOLT 7: add gossip address descriptor type DNS hostname #911

Long Term Updates

• Liquidity ads option_will_fund: liquidity ads #878
• Splicing Splice draft (feature 62/63) #863
• Simplified commitment Feature 106/107: option_simplified_update. #867
• Trampoline routing Trampoline Routing (2021 edition) (Feature 56/57) #829 and Trampoline onion format (Feature 56/57) #836
• Upfront payments / DoS protection Hold fees #843
• Peer storage backup Peer backup storage (feature 40/41/42/43) #881
• Anonymous gossip
• Taproot updates

Backlog

The following are topics that we should discuss at some point, so if we have time to discuss them great, otherwise they slip to the next meeting.

• lnprototest (https://github.com/rustyrussell/lnprototest)

[t-bast]

I won't be able to attend this spec meeting, but I'll see most of you IRL soon!

[Roasbeef]

Re #989 (convo between rusty+roasbeef+cdecker): seems there's some overlap here w/ Trampoline potentially? Adding more Trampoline-like functionality here would allow the LSP to retry the payment internally which would give us better UX as the client can go offline completely and allow the LSP to retry the payment. Otherwise, the LSP just gets one shot, and can't retry afterwards since they can't re-use the onion (due to Sphinx replay protection).

[Roasbeef]

Re onion messaging: ppl starting to make more concrete sketches for rate limiting (back propagation?). More to be discussed in meatspace.

[TheBlueMatt]

Re #989 (convo between rusty+roasbeef+cdecker): seems there's some overlap here w/ Trampoline potentially?

Sure, there's overlap between several different things. Letting the LSP retry would also be useful.

[t-bast]

Thanks for the summary @Roasbeef!