Lightning Specification Meeting 2024/10/21

[t-bast]

The meeting will take place on Monday 2024/10/21 at 7pm UTC (5:30am Adelaide time) on Libera Chat IRC #lightning-dev. It is open to the public.

Be careful with DST changes that affect the meeting time!

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

Recently Updated Proposals / Seeking Review

This section contains changes that have been opened or updated recently and need feedback from the meeting participants.

• Simplified mutual close option_simple_close (features 60/61) #1205
  • decide whether we require a clean shutdown exchange (for taproot nonces)
• Liquidity ads option_will_fund: liquidity ads #878 Extensible Liquidity Ads #1153
• Taproot extension-bolt: simple taproot channels (feature 80/81) #995
• Taproot gossip extension-bolt: taproot gossip (features 32/33) #1059
• BIP 353 in invoice_request Include BIP 353 name info in invoice_requests #1180
• Splicing Channel Splicing (feature 62/63) #1160
• Dynamic Commitments Extension/dynamic commitments #1117 vs Upgrade on Reestablish BOLT 2: upgrade protocol on reestablish #868
• Channel jamming draft: HTLC Endorsement to Mitigate Channel Jamming #1071
• Peer storage backup Peer backup storage (feature 40/41/42/43) #881 or Peer storage for nodes to distribute small encrypted blobs. #1110
• gossip_status BOLT 7: gossip_status (feature 66/67) #1186
• Async payments Support async payments in BOLT 12 #1149
• Bolt 12 contacts: https://delvingbitcoin.org/t/bolt-12-trusted-contacts/1046
• Clarify channel_reestablish requirements Clarify channel_reestablish requirements #1049 or Rework channel_reestablish requirements #1051

Stale Proposals

This section contains pending changes that may not need feedback from the meeting participants, unless someone explicitly asks for it during the meeting. These changes are usually waiting for implementation work to happen to drive more feedback.

• Inbound fees Inbound routing fees blips#18 and Add a bLIP for backwards-compatible inbound fees blips#22

Waiting for interop

This section contains changes that have been conceptually ACKed and are waiting for at least two implementations to fully interoperate.
They most likely don't need to be covered during the meeting, unless someone asks for updates.

• Trampoline routing Trampoline Routing (2021 edition) (Feature 56/57) #829 and Trampoline onion format (Feature 56/57) #836
  • @t-bast hasn't had time yet to update the spec with the changes decided during the summit, will hopefully be ready for the next meeting
• Zero reserve Add option_zero_reserve (FEATURE 64/65) #1140 (follow-up on bolt2: relax channel_reserve_satoshis requirements #1133 to include a feature bit)
• Attributable errors Attributable errors (feature 36/37) #1044
• Don't force close until error is received after channel_reestablish Nodes shouldn't publish their commitment when receiving outdated channel_reestablish #934

Long Term Updates

This section contains long-term changes that need review, but require a substantial implementation effort.

• Simplified commitment Feature 106/107: option_simplified_update. #867
• lnprototest (https://github.com/rustyrussell/lnprototest)

[t-bast]

I won't be able to join this meeting, nor the next two: my current location is very incompatible with the meeting time (3am)...
I'll prepare the meeting agenda and will respond to any comment made during the meeting based on the notes summary!

[ariard]

I dont’ think I will be able to join this meeting either. Though 2 topics I would like to talk about in the future:

• adding moderation rules like what has been done for bitcoin core, see Add moderation rules #1202
• add a feature bit flag for lightnings nodes that wish to signal they’re opt-in to experimenting with specs fixes (see ML)