Dusty Daemon ddustin

Project Description

In the last few years, I’ve worked tirelessly to implement the splicing protocol and been one of the very few teams working to add it to the Lightning specification. As a result of these community efforts, it is now possible to build on top of Splicing.

Splicing is the ability to mutate Lightning channels in real time. This enables the free flow of funds into and out of a Lightning channel while it is in use. Crucially, the flow of these funds is done in a merged style of transaction. Splices are inherently joined together into one transaction. This provides enormous privacy benefits onchain, as well as savings for onchain fees and a more efficient use of blockspace (less transactions happen because they’re joined together into a single transaction).

Merging disparate transactions into one is the holy grail of privacy. There are several other projects that aim to achieve this goal (Wasabi protocol, PayJoin, joinmarket) but none have the distributed footprint and usage for everyday pay

Bitcoin Address:

bc1p0889ewqydsuwtk7pa7qa32pe467y2jqq9rt0p65nessaun8edj6s7hrucr

Lightning (bolt12):

lno1zrxq8pjw7qjlm68mtp7e3yvxee4y5xrgjhhyf2fxhlphpckrvevh50u0q0ce3k8t8ecx66qzg6zt6tqcqc074lem4jza8azsg5kl9u8yv2jpvqsz0fxqkjk7ke75sz0thhdv7s79eszrxchuszzhfajftvx9a80agclsqvc0ur4g7qcxqm8qeeg4dmqvvmnx5zjqa6q9uxy3yn837acgxw0h78jdefrg94quygq0c67l3u97599x5554q25ghnq38xfmjs06mn2zpt78cndhwylf5qhfnc23hc8ktkvx0sn3sqqsu7llwkrd5cl72sh5s8shjwsu2c

MacBook-Pro-4.local 2026-01-08 12:29:20,048 INFO  f.a.eclair.Diagnostics n:03214a57e22c1f46c2d7208af20129b85ced30be2e5752b7dd5016716f9ab705ce c:b0739943887b840236a7a07cfd34cec9f9141f6e76a6630f19c2578b4a79fa64 - IN msg=Stfu(b0739943887b840236a7a07cfd34cec9f9141f6e76a6630f19c2578b4a79fa64,true)
MacBook-Pro-4.local 2026-01-08 12:29:20,049 INFO  f.a.e.i.Peer n:03214a57e22c1f46c2d7208af20129b85ced30be2e5752b7dd5016716f9ab705ce c:b0739943887b840236a7a07cfd34cec9f9141f6e76a6630f19c2578b4a79fa64 - IN msg=Stfu(b0739943887b840236a7a07cfd34cec9f9141f6e76a6630f19c2578b4a79fa64,true)
MacBook-Pro-4.local 2026-01-08 12:29:20,049 INFO  f.a.e.i.Peer n:03214a57e22c1f46c2d7208af20129b85ced30be2e5752b7dd5016716f9ab705ce c:b0739943887b840236a7a07cfd34cec9f9141f6e76a6630f19c2578b4a79fa64 - OUT msg=Stfu(b0739943887b840236a7a07cfd34cec9f9141f6e76a6630f19c2578b4a79fa64,false)
MacBook-Pro-4.local 2026-01-08 12:29:20,049 INFO  f.a.eclair.Diagnostics n:03214a57e22c1f46c2d7208af20129b85ced30be2e5752b7dd5016716f9ab705ce c:b0739943

2026-01-08T17:17:47.365Z INFO    lightningd: v25.12-93-gb58edcc-modded
2026-01-08T17:17:47.392Z INFO    lightningd: Creating configuration directory /tmp/l1/regtest
2026-01-08T17:17:47.392Z DEBUG   lightningd: Opened log file /tmp/l1/log
2026-01-08T17:17:47.393Z DEBUG   plugin-manager: started(76841) /Users/ddustin/Development/lightningTwo/plugins/autoclean
2026-01-08T17:17:47.394Z DEBUG   plugin-manager: started(76842) /Users/ddustin/Development/lightningTwo/plugins/chanbackup
2026-01-08T17:17:47.395Z DEBUG   plugin-manager: started(76844) /Users/ddustin/Development/lightningTwo/plugins/bcli
2026-01-08T17:17:47.396Z DEBUG   plugin-manager: started(76846) /Users/ddustin/Development/lightningTwo/plugins/commando
2026-01-08T17:17:47.396Z DEBUG   plugin-manager: started(76848) /Users/ddustin/Development/lightningTwo/plugins/funder
2026-01-08T17:17:47.397Z DEBUG   plugin-manager: started(76849) /Users/ddustin/Development/lightningTwo/plugins/topology

   Alice                           Bob
     |                              |
     | splice_locked       -------> |
     | update_add_htlc     -------> |
     | commit_sig          -------> | batch_size=2, funding_tx=funding_tx_1
     | commit_sig          -------> | batch_size=2, funding_tx=funding_tx_2
     |                splice_locked | (recieved)
     | <-------       splice_locked | (sent)
 | | NOTE: Bob now expects a single commit_sig

1) How did you spend your time?

I accomplished two primary things with my time. The first is a large progression towards so called "inter-op" for Splicing with Eclair. Inter-op is when two separate lightning implementations support splicing and are able to perform a splice between the two implementations. Essentially this means having a channel between the Eclair and CLN implementations, then doing a splice over that channel. Once a single splice is completed, numerous edge and corner cases are tested and must be handled robustly by both implementations.

This step is a big deal because once completed splicing officially becomes part of the Lightning specification for BOLTs 2, 7, and 9.

In a test environment I setup Eclair and CLN nodes and formed a channel between them. Then I attempted splicing. Numerous issues and incompatibilities emerged and had to be addressed.

These tests are important to lightning for two reasons:

Imagine a three node network with two channels

A <-> B <-> C

Let's say B would like to perform two splices:

splice-out 10M sats from A <-> B
splice-out 10M sats from B <-> C

IMMEDIATELY AFTER RECEIVING CHANNEL_REESTABLISH

Do we have any active inflight splices?
- Yes:
  - does latest splice inflight have commit and remote sig?
    - Yes: continue
    - No: send next_funding txid of latest inflight candidate, then, continue
  - peer sends next_funding value of:
    - None: Have I sent splice tx signatures?
      - Yes: Have I received splice tx signatures?
Yes: send nothing

	2025-02-01T22:42:36.4316216Z Current runner version: '2.322.0'
	2025-02-01T22:42:36.4345187Z ##[group]Operating System
	2025-02-01T22:42:36.4345932Z Ubuntu
	2025-02-01T22:42:36.4346362Z 22.04.5
	2025-02-01T22:42:36.4346982Z LTS
	2025-02-01T22:42:36.4347454Z ##[endgroup]
	2025-02-01T22:42:36.4347914Z ##[group]Runner Image
	2025-02-01T22:42:36.4348582Z Image: ubuntu-22.04
	2025-02-01T22:42:36.4349089Z Version: 20250126.1.0
	2025-02-01T22:42:36.4350035Z Included Software: https://github.com/actions/runner-images/blob/ubuntu22/20250126.1/images/ubuntu/Ubuntu2204-Readme.md

	Question of reestablish and `tx_abort`.

	We two nodes, l1 and l2 who are doing an interactive splice. Both sides have sent `tx_complete` and the splice has reached the signing phase.

	By signature ordering rules, l2 signs first.

	```
	l1 l2
	<- commit_sig
	l1 restarts