Add funding redeem script to `ChannelDetails` and `ChannelPending` event by benthecarman · Pull Request #4234 · lightningdevkit/rust-lightning

benthecarman · 2025-11-19T15:44:39Z

Original context and motivation comes from here: lightningdevkit/ldk-node#677 (comment)

When splicing-in, the default case is our channel utxo + our wallet utxos being combined. This works great however, it can give our wallet issues calculating fees after the fact because our wallet needs to know about our channel's utxo. We currently have it's outpoint and satoshi value available, but not its output script so we are unable to construct the TxOut for the channel. This adds the redeem script to the ChannelDetails and ChannelPending event which gives us enough information to be able to construct it.

ldk-reviews-bot · 2025-11-19T15:44:43Z

👋 Thanks for assigning @jkczyz as a reviewer!
I'll wait for their review and will help manage the review process.
Once they submit their review, I'll check if a second reviewer would be helpful.

jkczyz

LGTM

ldk-reviews-bot · 2025-11-19T16:38:31Z

👋 The first review has been submitted!

Do you think this PR is ready for a second reviewer? If so, click here to assign a second reviewer.

codecov · 2025-11-19T18:16:26Z

Codecov Report

❌ Patch coverage is 69.04762% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.32%. Comparing base (6d9c676) to head (e3ebe7a).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
lightning/src/ln/channel_state.rs	46.66%	8 Missing ⚠️
lightning/src/routing/router.rs	50.00%	4 Missing ⚠️
lightning/src/ln/channelmanager.rs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #4234 +/- ##
==========================================
- Coverage 89.32% 89.32% -0.01% 
==========================================
Files 180 180 Lines 138641 138680 +39 Branches 138641 138680 +39 ==========================================
+ Hits 123844 123877 +33 - Misses 12174 12179 +5 - Partials 2623 2624 +1

Flag	Coverage Δ
fuzzing	`35.97% <46.66%> (+<0.01%)`	⬆️
tests	`88.69% <69.04%> (-0.01%)`	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

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jkczyz

As noted in lightningdevkit/ldk-node#677 (comment), we should include this in SplicePending, too, since subsequent splices will spend the new funding output. Feel free to do it in a follow-up if you prefer.

benthecarman · 2025-11-19T19:42:02Z

Added to the SplicePending event

jkczyz · 2025-11-19T19:50:32Z

+ new_funding_redeem_script: chan
+ .funding
+ .get_funding_redeemscript(),


This will still be the old funding until the splice is promoted. You'll need to communicate it through SpliceFundingNegotiated.

jkczyz · 2025-11-19T20:51:34Z

 channel_type: Option<ChannelTypeFeatures>,
+ /// The witness script that can be used to spend the funding output for this channel.
+ ///
+ /// This field will be `None` for objects serialized with LDK versions prior to 0.2.0.


Sounds like this won't make 0.2 but feel free to petition @TheBlueMatt :)

TheBlueMatt

I'll be honest I'm pretty annoyed we're talking about changing the 0.2 API almost two months after we intended to ship it, but if we land this today maybe we still include it in 0.2.

TheBlueMatt · 2025-11-20T15:00:33Z

@@ -475,6 +479,17 @@ impl ChannelDetails {
 self.short_channel_id.or(self.outbound_scid_alias)
 	}

+	/// Gets the funding output for this channel, if available.


These need docs on when it changes wrt a splice. When a splice happens at what point in the splice do these switch over to the new values?

Added, looked through the code and seems it happens after the commitment signed messages were exchanged.

jkczyz · 2025-11-20T16:05:40Z

+	/// During a splice, the funding output will change and this value will be updated
+	/// after the `commitment_signed` messages have been exchanged.


Hmmm... this should only change when the splice has been promoted (i.e., when the FundingScope from the pending splice is swapped in for the current FundingScope). That happens after splice_locked has been exchanged.
rust-lightning/lightning/src/ln/channel.rs
Line 11200 in 6d9c676
core::mem::swap(&mutself.funding, funding);
Maybe you were looking at channel establishment?

Oh I see, i think what I was looking at when that FundedChannel was being created/updated here:
rust-lightning/lightning/src/ln/channel.rs
Line 2219 in e3ebe7a
self.phase = ChannelPhase::Funded(funded_channel);

Original context and motivation comes from here: lightningdevkit/ldk-node#677 (comment) When splicing-in, the default case is our channel utxo + our wallet utxos being combined. This works great however, it can give our wallet issues calculating fees after the fact because our wallet needs to know about our channel's utxo. We currently have it's outpoint and satoshi value available, but not its output script so we are unable to construct the TxOut for the channel. This adds the redeem script to the `ChannelDetails` and `ChannelPending` event which gives us enough information to be able to construct it.

TheBlueMatt · 2025-12-02T14:47:55Z

Backported in #4239.

benthecarman · 2025-11-19T15:44:39Z

Original context and motivation comes from here: lightningdevkit/ldk-node#677 (comment)

When splicing-in, the default case is our channel utxo + our wallet utxos being combined. This works great however, it can give our wallet issues calculating fees after the fact because our wallet needs to know about our channel's utxo. We currently have it's outpoint and satoshi value available, but not its output script so we are unable to construct the TxOut for the channel. This adds the redeem script to the ChannelDetails and ChannelPending event which gives us enough information to be able to construct it.

ldk-reviews-bot · 2025-11-19T15:44:43Z

👋 Thanks for assigning @jkczyz as a reviewer!
I'll wait for their review and will help manage the review process.
Once they submit their review, I'll check if a second reviewer would be helpful.

jkczyz

LGTM

ldk-reviews-bot · 2025-11-19T16:38:31Z

👋 The first review has been submitted!

Do you think this PR is ready for a second reviewer? If so, click here to assign a second reviewer.

codecov · 2025-11-19T18:16:26Z

Codecov Report

❌ Patch coverage is 69.04762% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.32%. Comparing base (6d9c676) to head (e3ebe7a).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
lightning/src/ln/channel_state.rs	46.66%	8 Missing ⚠️
lightning/src/routing/router.rs	50.00%	4 Missing ⚠️
lightning/src/ln/channelmanager.rs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #4234 +/- ##
==========================================
- Coverage 89.32% 89.32% -0.01% 
==========================================
Files 180 180 Lines 138641 138680 +39 Branches 138641 138680 +39 ==========================================
+ Hits 123844 123877 +33 - Misses 12174 12179 +5 - Partials 2623 2624 +1

Flag	Coverage Δ
fuzzing	`35.97% <46.66%> (+<0.01%)`	⬆️
tests	`88.69% <69.04%> (-0.01%)`	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

jkczyz

As noted in lightningdevkit/ldk-node#677 (comment), we should include this in SplicePending, too, since subsequent splices will spend the new funding output. Feel free to do it in a follow-up if you prefer.

benthecarman · 2025-11-19T19:42:02Z

Added to the SplicePending event

jkczyz · 2025-11-19T19:50:32Z

+ new_funding_redeem_script: chan
+ .funding
+ .get_funding_redeemscript(),


This will still be the old funding until the splice is promoted. You'll need to communicate it through SpliceFundingNegotiated.

jkczyz · 2025-11-19T20:51:34Z

 channel_type: Option<ChannelTypeFeatures>,
+ /// The witness script that can be used to spend the funding output for this channel.
+ ///
+ /// This field will be `None` for objects serialized with LDK versions prior to 0.2.0.


Sounds like this won't make 0.2 but feel free to petition @TheBlueMatt :)

TheBlueMatt

I'll be honest I'm pretty annoyed we're talking about changing the 0.2 API almost two months after we intended to ship it, but if we land this today maybe we still include it in 0.2.

TheBlueMatt · 2025-11-20T15:00:33Z

@@ -475,6 +479,17 @@ impl ChannelDetails {
 self.short_channel_id.or(self.outbound_scid_alias)
 	}

+	/// Gets the funding output for this channel, if available.


These need docs on when it changes wrt a splice. When a splice happens at what point in the splice do these switch over to the new values?

Added, looked through the code and seems it happens after the commitment signed messages were exchanged.

jkczyz · 2025-11-20T16:05:40Z

+	/// During a splice, the funding output will change and this value will be updated
+	/// after the `commitment_signed` messages have been exchanged.


Hmmm... this should only change when the splice has been promoted (i.e., when the FundingScope from the pending splice is swapped in for the current FundingScope). That happens after splice_locked has been exchanged.
rust-lightning/lightning/src/ln/channel.rs
Line 11200 in 6d9c676
core::mem::swap(&mutself.funding, funding);
Maybe you were looking at channel establishment?

Oh I see, i think what I was looking at when that FundedChannel was being created/updated here:
rust-lightning/lightning/src/ln/channel.rs
Line 2219 in e3ebe7a
self.phase = ChannelPhase::Funded(funded_channel);

Original context and motivation comes from here: lightningdevkit/ldk-node#677 (comment) When splicing-in, the default case is our channel utxo + our wallet utxos being combined. This works great however, it can give our wallet issues calculating fees after the fact because our wallet needs to know about our channel's utxo. We currently have it's outpoint and satoshi value available, but not its output script so we are unable to construct the TxOut for the channel. This adds the redeem script to the `ChannelDetails` and `ChannelPending` event which gives us enough information to be able to construct it.

TheBlueMatt · 2025-12-02T14:47:55Z

Backported in #4239.

benthecarman · 2025-11-19T15:44:39Z

Original context and motivation comes from here: lightningdevkit/ldk-node#677 (comment)

When splicing-in, the default case is our channel utxo + our wallet utxos being combined. This works great however, it can give our wallet issues calculating fees after the fact because our wallet needs to know about our channel's utxo. We currently have it's outpoint and satoshi value available, but not its output script so we are unable to construct the TxOut for the channel. This adds the redeem script to the ChannelDetails and ChannelPending event which gives us enough information to be able to construct it.

ldk-reviews-bot · 2025-11-19T15:44:43Z

👋 Thanks for assigning @jkczyz as a reviewer!
I'll wait for their review and will help manage the review process.
Once they submit their review, I'll check if a second reviewer would be helpful.

jkczyz

LGTM

ldk-reviews-bot · 2025-11-19T16:38:31Z

👋 The first review has been submitted!

Do you think this PR is ready for a second reviewer? If so, click here to assign a second reviewer.

codecov · 2025-11-19T18:16:26Z

Codecov Report

❌ Patch coverage is 69.04762% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.32%. Comparing base (6d9c676) to head (e3ebe7a).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
lightning/src/ln/channel_state.rs	46.66%	8 Missing ⚠️
lightning/src/routing/router.rs	50.00%	4 Missing ⚠️
lightning/src/ln/channelmanager.rs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #4234 +/- ##
==========================================
- Coverage 89.32% 89.32% -0.01% 
==========================================
Files 180 180 Lines 138641 138680 +39 Branches 138641 138680 +39 ==========================================
+ Hits 123844 123877 +33 - Misses 12174 12179 +5 - Partials 2623 2624 +1

Flag	Coverage Δ
fuzzing	`35.97% <46.66%> (+<0.01%)`	⬆️
tests	`88.69% <69.04%> (-0.01%)`	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

jkczyz

As noted in lightningdevkit/ldk-node#677 (comment), we should include this in SplicePending, too, since subsequent splices will spend the new funding output. Feel free to do it in a follow-up if you prefer.

benthecarman · 2025-11-19T19:42:02Z

Added to the SplicePending event

jkczyz · 2025-11-19T19:50:32Z

+ new_funding_redeem_script: chan
+ .funding
+ .get_funding_redeemscript(),


This will still be the old funding until the splice is promoted. You'll need to communicate it through SpliceFundingNegotiated.

jkczyz · 2025-11-19T20:51:34Z

 channel_type: Option<ChannelTypeFeatures>,
+ /// The witness script that can be used to spend the funding output for this channel.
+ ///
+ /// This field will be `None` for objects serialized with LDK versions prior to 0.2.0.


Sounds like this won't make 0.2 but feel free to petition @TheBlueMatt :)

TheBlueMatt

I'll be honest I'm pretty annoyed we're talking about changing the 0.2 API almost two months after we intended to ship it, but if we land this today maybe we still include it in 0.2.

TheBlueMatt · 2025-11-20T15:00:33Z

@@ -475,6 +479,17 @@ impl ChannelDetails {
 self.short_channel_id.or(self.outbound_scid_alias)
 	}

+	/// Gets the funding output for this channel, if available.


These need docs on when it changes wrt a splice. When a splice happens at what point in the splice do these switch over to the new values?

Added, looked through the code and seems it happens after the commitment signed messages were exchanged.

jkczyz · 2025-11-20T16:05:40Z

+	/// During a splice, the funding output will change and this value will be updated
+	/// after the `commitment_signed` messages have been exchanged.


Hmmm... this should only change when the splice has been promoted (i.e., when the FundingScope from the pending splice is swapped in for the current FundingScope). That happens after splice_locked has been exchanged.
rust-lightning/lightning/src/ln/channel.rs
Line 11200 in 6d9c676
core::mem::swap(&mutself.funding, funding);
Maybe you were looking at channel establishment?

Oh I see, i think what I was looking at when that FundedChannel was being created/updated here:
rust-lightning/lightning/src/ln/channel.rs
Line 2219 in e3ebe7a
self.phase = ChannelPhase::Funded(funded_channel);

Original context and motivation comes from here: lightningdevkit/ldk-node#677 (comment) When splicing-in, the default case is our channel utxo + our wallet utxos being combined. This works great however, it can give our wallet issues calculating fees after the fact because our wallet needs to know about our channel's utxo. We currently have it's outpoint and satoshi value available, but not its output script so we are unable to construct the TxOut for the channel. This adds the redeem script to the `ChannelDetails` and `ChannelPending` event which gives us enough information to be able to construct it.

TheBlueMatt · 2025-12-02T14:47:55Z

Backported in #4239.

benthecarman · 2025-11-19T15:44:39Z

Original context and motivation comes from here: lightningdevkit/ldk-node#677 (comment)

When splicing-in, the default case is our channel utxo + our wallet utxos being combined. This works great however, it can give our wallet issues calculating fees after the fact because our wallet needs to know about our channel's utxo. We currently have it's outpoint and satoshi value available, but not its output script so we are unable to construct the TxOut for the channel. This adds the redeem script to the ChannelDetails and ChannelPending event which gives us enough information to be able to construct it.

ldk-reviews-bot · 2025-11-19T15:44:43Z

👋 Thanks for assigning @jkczyz as a reviewer!
I'll wait for their review and will help manage the review process.
Once they submit their review, I'll check if a second reviewer would be helpful.

jkczyz

LGTM

ldk-reviews-bot · 2025-11-19T16:38:31Z

👋 The first review has been submitted!

Do you think this PR is ready for a second reviewer? If so, click here to assign a second reviewer.

codecov · 2025-11-19T18:16:26Z

Codecov Report

❌ Patch coverage is 69.04762% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.32%. Comparing base (6d9c676) to head (e3ebe7a).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
lightning/src/ln/channel_state.rs	46.66%	8 Missing ⚠️
lightning/src/routing/router.rs	50.00%	4 Missing ⚠️
lightning/src/ln/channelmanager.rs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #4234 +/- ##
==========================================
- Coverage 89.32% 89.32% -0.01% 
==========================================
Files 180 180 Lines 138641 138680 +39 Branches 138641 138680 +39 ==========================================
+ Hits 123844 123877 +33 - Misses 12174 12179 +5 - Partials 2623 2624 +1

Flag	Coverage Δ
fuzzing	`35.97% <46.66%> (+<0.01%)`	⬆️
tests	`88.69% <69.04%> (-0.01%)`	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

jkczyz

As noted in lightningdevkit/ldk-node#677 (comment), we should include this in SplicePending, too, since subsequent splices will spend the new funding output. Feel free to do it in a follow-up if you prefer.

benthecarman · 2025-11-19T19:42:02Z

Added to the SplicePending event

jkczyz · 2025-11-19T19:50:32Z

+ new_funding_redeem_script: chan
+ .funding
+ .get_funding_redeemscript(),


This will still be the old funding until the splice is promoted. You'll need to communicate it through SpliceFundingNegotiated.

jkczyz · 2025-11-19T20:51:34Z

 channel_type: Option<ChannelTypeFeatures>,
+ /// The witness script that can be used to spend the funding output for this channel.
+ ///
+ /// This field will be `None` for objects serialized with LDK versions prior to 0.2.0.


Sounds like this won't make 0.2 but feel free to petition @TheBlueMatt :)

TheBlueMatt

I'll be honest I'm pretty annoyed we're talking about changing the 0.2 API almost two months after we intended to ship it, but if we land this today maybe we still include it in 0.2.

TheBlueMatt · 2025-11-20T15:00:33Z

@@ -475,6 +479,17 @@ impl ChannelDetails {
 self.short_channel_id.or(self.outbound_scid_alias)
 	}

+	/// Gets the funding output for this channel, if available.


These need docs on when it changes wrt a splice. When a splice happens at what point in the splice do these switch over to the new values?

Added, looked through the code and seems it happens after the commitment signed messages were exchanged.

jkczyz · 2025-11-20T16:05:40Z

+	/// During a splice, the funding output will change and this value will be updated
+	/// after the `commitment_signed` messages have been exchanged.


Hmmm... this should only change when the splice has been promoted (i.e., when the FundingScope from the pending splice is swapped in for the current FundingScope). That happens after splice_locked has been exchanged.
rust-lightning/lightning/src/ln/channel.rs
Line 11200 in 6d9c676
core::mem::swap(&mutself.funding, funding);
Maybe you were looking at channel establishment?

Oh I see, i think what I was looking at when that FundedChannel was being created/updated here:
rust-lightning/lightning/src/ln/channel.rs
Line 2219 in e3ebe7a
self.phase = ChannelPhase::Funded(funded_channel);

Original context and motivation comes from here: lightningdevkit/ldk-node#677 (comment) When splicing-in, the default case is our channel utxo + our wallet utxos being combined. This works great however, it can give our wallet issues calculating fees after the fact because our wallet needs to know about our channel's utxo. We currently have it's outpoint and satoshi value available, but not its output script so we are unable to construct the TxOut for the channel. This adds the redeem script to the `ChannelDetails` and `ChannelPending` event which gives us enough information to be able to construct it.

TheBlueMatt · 2025-12-02T14:47:55Z

Backported in #4239.

benthecarman · 2025-11-19T15:44:39Z

Original context and motivation comes from here: lightningdevkit/ldk-node#677 (comment)

When splicing-in, the default case is our channel utxo + our wallet utxos being combined. This works great however, it can give our wallet issues calculating fees after the fact because our wallet needs to know about our channel's utxo. We currently have it's outpoint and satoshi value available, but not its output script so we are unable to construct the TxOut for the channel. This adds the redeem script to the ChannelDetails and ChannelPending event which gives us enough information to be able to construct it.

ldk-reviews-bot · 2025-11-19T15:44:43Z

👋 Thanks for assigning @jkczyz as a reviewer!
I'll wait for their review and will help manage the review process.
Once they submit their review, I'll check if a second reviewer would be helpful.

jkczyz

LGTM

ldk-reviews-bot · 2025-11-19T16:38:31Z

👋 The first review has been submitted!

Do you think this PR is ready for a second reviewer? If so, click here to assign a second reviewer.

codecov · 2025-11-19T18:16:26Z

Codecov Report

❌ Patch coverage is 69.04762% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.32%. Comparing base (6d9c676) to head (e3ebe7a).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
lightning/src/ln/channel_state.rs	46.66%	8 Missing ⚠️
lightning/src/routing/router.rs	50.00%	4 Missing ⚠️
lightning/src/ln/channelmanager.rs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #4234 +/- ##
==========================================
- Coverage 89.32% 89.32% -0.01% 
==========================================
Files 180 180 Lines 138641 138680 +39 Branches 138641 138680 +39 ==========================================
+ Hits 123844 123877 +33 - Misses 12174 12179 +5 - Partials 2623 2624 +1

Flag	Coverage Δ
fuzzing	`35.97% <46.66%> (+<0.01%)`	⬆️
tests	`88.69% <69.04%> (-0.01%)`	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

jkczyz

As noted in lightningdevkit/ldk-node#677 (comment), we should include this in SplicePending, too, since subsequent splices will spend the new funding output. Feel free to do it in a follow-up if you prefer.

benthecarman · 2025-11-19T19:42:02Z

Added to the SplicePending event

jkczyz · 2025-11-19T19:50:32Z

+ new_funding_redeem_script: chan
+ .funding
+ .get_funding_redeemscript(),


This will still be the old funding until the splice is promoted. You'll need to communicate it through SpliceFundingNegotiated.

jkczyz · 2025-11-19T20:51:34Z

 channel_type: Option<ChannelTypeFeatures>,
+ /// The witness script that can be used to spend the funding output for this channel.
+ ///
+ /// This field will be `None` for objects serialized with LDK versions prior to 0.2.0.


Sounds like this won't make 0.2 but feel free to petition @TheBlueMatt :)

TheBlueMatt

I'll be honest I'm pretty annoyed we're talking about changing the 0.2 API almost two months after we intended to ship it, but if we land this today maybe we still include it in 0.2.

TheBlueMatt · 2025-11-20T15:00:33Z

@@ -475,6 +479,17 @@ impl ChannelDetails {
 self.short_channel_id.or(self.outbound_scid_alias)
 	}

+	/// Gets the funding output for this channel, if available.


These need docs on when it changes wrt a splice. When a splice happens at what point in the splice do these switch over to the new values?

Added, looked through the code and seems it happens after the commitment signed messages were exchanged.

jkczyz · 2025-11-20T16:05:40Z

+	/// During a splice, the funding output will change and this value will be updated
+	/// after the `commitment_signed` messages have been exchanged.


Hmmm... this should only change when the splice has been promoted (i.e., when the FundingScope from the pending splice is swapped in for the current FundingScope). That happens after splice_locked has been exchanged.
rust-lightning/lightning/src/ln/channel.rs
Line 11200 in 6d9c676
core::mem::swap(&mutself.funding, funding);
Maybe you were looking at channel establishment?

Oh I see, i think what I was looking at when that FundedChannel was being created/updated here:
rust-lightning/lightning/src/ln/channel.rs
Line 2219 in e3ebe7a
self.phase = ChannelPhase::Funded(funded_channel);

Original context and motivation comes from here: lightningdevkit/ldk-node#677 (comment) When splicing-in, the default case is our channel utxo + our wallet utxos being combined. This works great however, it can give our wallet issues calculating fees after the fact because our wallet needs to know about our channel's utxo. We currently have it's outpoint and satoshi value available, but not its output script so we are unable to construct the TxOut for the channel. This adds the redeem script to the `ChannelDetails` and `ChannelPending` event which gives us enough information to be able to construct it.

TheBlueMatt · 2025-12-02T14:47:55Z

Backported in #4239.

benthecarman · 2025-11-19T15:44:39Z

Original context and motivation comes from here: lightningdevkit/ldk-node#677 (comment)

When splicing-in, the default case is our channel utxo + our wallet utxos being combined. This works great however, it can give our wallet issues calculating fees after the fact because our wallet needs to know about our channel's utxo. We currently have it's outpoint and satoshi value available, but not its output script so we are unable to construct the TxOut for the channel. This adds the redeem script to the ChannelDetails and ChannelPending event which gives us enough information to be able to construct it.

ldk-reviews-bot · 2025-11-19T15:44:43Z

👋 Thanks for assigning @jkczyz as a reviewer!
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Once they submit their review, I'll check if a second reviewer would be helpful.

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LGTM

ldk-reviews-bot · 2025-11-19T16:38:31Z

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codecov · 2025-11-19T18:16:26Z

Codecov Report

❌ Patch coverage is 69.04762% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.32%. Comparing base (6d9c676) to head (e3ebe7a).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
lightning/src/ln/channel_state.rs	46.66%	8 Missing ⚠️
lightning/src/routing/router.rs	50.00%	4 Missing ⚠️
lightning/src/ln/channelmanager.rs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #4234 +/- ##
==========================================
- Coverage 89.32% 89.32% -0.01% 
==========================================
Files 180 180 Lines 138641 138680 +39 Branches 138641 138680 +39 ==========================================
+ Hits 123844 123877 +33 - Misses 12174 12179 +5 - Partials 2623 2624 +1

Flag	Coverage Δ
fuzzing	`35.97% <46.66%> (+<0.01%)`	⬆️
tests	`88.69% <69.04%> (-0.01%)`	⬇️

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jkczyz

As noted in lightningdevkit/ldk-node#677 (comment), we should include this in SplicePending, too, since subsequent splices will spend the new funding output. Feel free to do it in a follow-up if you prefer.

benthecarman · 2025-11-19T19:42:02Z

Added to the SplicePending event

jkczyz · 2025-11-19T19:50:32Z

+ new_funding_redeem_script: chan
+ .funding
+ .get_funding_redeemscript(),


This will still be the old funding until the splice is promoted. You'll need to communicate it through SpliceFundingNegotiated.

jkczyz · 2025-11-19T20:51:34Z

 channel_type: Option<ChannelTypeFeatures>,
+ /// The witness script that can be used to spend the funding output for this channel.
+ ///
+ /// This field will be `None` for objects serialized with LDK versions prior to 0.2.0.


Sounds like this won't make 0.2 but feel free to petition @TheBlueMatt :)

TheBlueMatt

I'll be honest I'm pretty annoyed we're talking about changing the 0.2 API almost two months after we intended to ship it, but if we land this today maybe we still include it in 0.2.

TheBlueMatt · 2025-11-20T15:00:33Z

@@ -475,6 +479,17 @@ impl ChannelDetails {
 self.short_channel_id.or(self.outbound_scid_alias)
 	}

+	/// Gets the funding output for this channel, if available.


These need docs on when it changes wrt a splice. When a splice happens at what point in the splice do these switch over to the new values?

Added, looked through the code and seems it happens after the commitment signed messages were exchanged.

jkczyz · 2025-11-20T16:05:40Z

+	/// During a splice, the funding output will change and this value will be updated
+	/// after the `commitment_signed` messages have been exchanged.


Hmmm... this should only change when the splice has been promoted (i.e., when the FundingScope from the pending splice is swapped in for the current FundingScope). That happens after splice_locked has been exchanged.
rust-lightning/lightning/src/ln/channel.rs
Line 11200 in 6d9c676
core::mem::swap(&mutself.funding, funding);
Maybe you were looking at channel establishment?

Oh I see, i think what I was looking at when that FundedChannel was being created/updated here:
rust-lightning/lightning/src/ln/channel.rs
Line 2219 in e3ebe7a
self.phase = ChannelPhase::Funded(funded_channel);

Original context and motivation comes from here: lightningdevkit/ldk-node#677 (comment) When splicing-in, the default case is our channel utxo + our wallet utxos being combined. This works great however, it can give our wallet issues calculating fees after the fact because our wallet needs to know about our channel's utxo. We currently have it's outpoint and satoshi value available, but not its output script so we are unable to construct the TxOut for the channel. This adds the redeem script to the `ChannelDetails` and `ChannelPending` event which gives us enough information to be able to construct it.

TheBlueMatt · 2025-12-02T14:47:55Z

Backported in #4239.

benthecarman · 2025-11-19T15:44:39Z

Original context and motivation comes from here: lightningdevkit/ldk-node#677 (comment)

When splicing-in, the default case is our channel utxo + our wallet utxos being combined. This works great however, it can give our wallet issues calculating fees after the fact because our wallet needs to know about our channel's utxo. We currently have it's outpoint and satoshi value available, but not its output script so we are unable to construct the TxOut for the channel. This adds the redeem script to the ChannelDetails and ChannelPending event which gives us enough information to be able to construct it.

ldk-reviews-bot · 2025-11-19T15:44:43Z

👋 Thanks for assigning @jkczyz as a reviewer!
I'll wait for their review and will help manage the review process.
Once they submit their review, I'll check if a second reviewer would be helpful.

jkczyz

LGTM

ldk-reviews-bot · 2025-11-19T16:38:31Z

👋 The first review has been submitted!

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codecov · 2025-11-19T18:16:26Z

Codecov Report

❌ Patch coverage is 69.04762% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.32%. Comparing base (6d9c676) to head (e3ebe7a).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
lightning/src/ln/channel_state.rs	46.66%	8 Missing ⚠️
lightning/src/routing/router.rs	50.00%	4 Missing ⚠️
lightning/src/ln/channelmanager.rs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #4234 +/- ##
==========================================
- Coverage 89.32% 89.32% -0.01% 
==========================================
Files 180 180 Lines 138641 138680 +39 Branches 138641 138680 +39 ==========================================
+ Hits 123844 123877 +33 - Misses 12174 12179 +5 - Partials 2623 2624 +1

Flag	Coverage Δ
fuzzing	`35.97% <46.66%> (+<0.01%)`	⬆️
tests	`88.69% <69.04%> (-0.01%)`	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

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📢 Have feedback on the report? Share it here.

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jkczyz

As noted in lightningdevkit/ldk-node#677 (comment), we should include this in SplicePending, too, since subsequent splices will spend the new funding output. Feel free to do it in a follow-up if you prefer.

benthecarman · 2025-11-19T19:42:02Z

Added to the SplicePending event

jkczyz · 2025-11-19T19:50:32Z

+ new_funding_redeem_script: chan
+ .funding
+ .get_funding_redeemscript(),


This will still be the old funding until the splice is promoted. You'll need to communicate it through SpliceFundingNegotiated.

jkczyz · 2025-11-19T20:51:34Z

 channel_type: Option<ChannelTypeFeatures>,
+ /// The witness script that can be used to spend the funding output for this channel.
+ ///
+ /// This field will be `None` for objects serialized with LDK versions prior to 0.2.0.


Sounds like this won't make 0.2 but feel free to petition @TheBlueMatt :)

TheBlueMatt

I'll be honest I'm pretty annoyed we're talking about changing the 0.2 API almost two months after we intended to ship it, but if we land this today maybe we still include it in 0.2.

TheBlueMatt · 2025-11-20T15:00:33Z

@@ -475,6 +479,17 @@ impl ChannelDetails {
 self.short_channel_id.or(self.outbound_scid_alias)
 	}

+	/// Gets the funding output for this channel, if available.


These need docs on when it changes wrt a splice. When a splice happens at what point in the splice do these switch over to the new values?

Added, looked through the code and seems it happens after the commitment signed messages were exchanged.

jkczyz · 2025-11-20T16:05:40Z

+	/// During a splice, the funding output will change and this value will be updated
+	/// after the `commitment_signed` messages have been exchanged.


Hmmm... this should only change when the splice has been promoted (i.e., when the FundingScope from the pending splice is swapped in for the current FundingScope). That happens after splice_locked has been exchanged.
rust-lightning/lightning/src/ln/channel.rs
Line 11200 in 6d9c676
core::mem::swap(&mutself.funding, funding);
Maybe you were looking at channel establishment?

Oh I see, i think what I was looking at when that FundedChannel was being created/updated here:
rust-lightning/lightning/src/ln/channel.rs
Line 2219 in e3ebe7a
self.phase = ChannelPhase::Funded(funded_channel);

Original context and motivation comes from here: lightningdevkit/ldk-node#677 (comment) When splicing-in, the default case is our channel utxo + our wallet utxos being combined. This works great however, it can give our wallet issues calculating fees after the fact because our wallet needs to know about our channel's utxo. We currently have it's outpoint and satoshi value available, but not its output script so we are unable to construct the TxOut for the channel. This adds the redeem script to the `ChannelDetails` and `ChannelPending` event which gives us enough information to be able to construct it.

TheBlueMatt · 2025-12-02T14:47:55Z

Backported in #4239.

benthecarman · 2025-11-19T15:44:39Z

Original context and motivation comes from here: lightningdevkit/ldk-node#677 (comment)

When splicing-in, the default case is our channel utxo + our wallet utxos being combined. This works great however, it can give our wallet issues calculating fees after the fact because our wallet needs to know about our channel's utxo. We currently have it's outpoint and satoshi value available, but not its output script so we are unable to construct the TxOut for the channel. This adds the redeem script to the ChannelDetails and ChannelPending event which gives us enough information to be able to construct it.

ldk-reviews-bot · 2025-11-19T15:44:43Z

👋 Thanks for assigning @jkczyz as a reviewer!
I'll wait for their review and will help manage the review process.
Once they submit their review, I'll check if a second reviewer would be helpful.

jkczyz

LGTM

ldk-reviews-bot · 2025-11-19T16:38:31Z

👋 The first review has been submitted!

Do you think this PR is ready for a second reviewer? If so, click here to assign a second reviewer.

codecov · 2025-11-19T18:16:26Z

Codecov Report

❌ Patch coverage is 69.04762% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.32%. Comparing base (6d9c676) to head (e3ebe7a).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
lightning/src/ln/channel_state.rs	46.66%	8 Missing ⚠️
lightning/src/routing/router.rs	50.00%	4 Missing ⚠️
lightning/src/ln/channelmanager.rs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #4234 +/- ##
==========================================
- Coverage 89.32% 89.32% -0.01% 
==========================================
Files 180 180 Lines 138641 138680 +39 Branches 138641 138680 +39 ==========================================
+ Hits 123844 123877 +33 - Misses 12174 12179 +5 - Partials 2623 2624 +1

Flag	Coverage Δ
fuzzing	`35.97% <46.66%> (+<0.01%)`	⬆️
tests	`88.69% <69.04%> (-0.01%)`	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

jkczyz

As noted in lightningdevkit/ldk-node#677 (comment), we should include this in SplicePending, too, since subsequent splices will spend the new funding output. Feel free to do it in a follow-up if you prefer.

benthecarman · 2025-11-19T19:42:02Z

Added to the SplicePending event

jkczyz · 2025-11-19T19:50:32Z

+ new_funding_redeem_script: chan
+ .funding
+ .get_funding_redeemscript(),


This will still be the old funding until the splice is promoted. You'll need to communicate it through SpliceFundingNegotiated.

jkczyz · 2025-11-19T20:51:34Z

 channel_type: Option<ChannelTypeFeatures>,
+ /// The witness script that can be used to spend the funding output for this channel.
+ ///
+ /// This field will be `None` for objects serialized with LDK versions prior to 0.2.0.


Sounds like this won't make 0.2 but feel free to petition @TheBlueMatt :)

TheBlueMatt

I'll be honest I'm pretty annoyed we're talking about changing the 0.2 API almost two months after we intended to ship it, but if we land this today maybe we still include it in 0.2.

TheBlueMatt · 2025-11-20T15:00:33Z

@@ -475,6 +479,17 @@ impl ChannelDetails {
 self.short_channel_id.or(self.outbound_scid_alias)
 	}

+	/// Gets the funding output for this channel, if available.


These need docs on when it changes wrt a splice. When a splice happens at what point in the splice do these switch over to the new values?

Added, looked through the code and seems it happens after the commitment signed messages were exchanged.

jkczyz · 2025-11-20T16:05:40Z

+	/// During a splice, the funding output will change and this value will be updated
+	/// after the `commitment_signed` messages have been exchanged.


Hmmm... this should only change when the splice has been promoted (i.e., when the FundingScope from the pending splice is swapped in for the current FundingScope). That happens after splice_locked has been exchanged.
rust-lightning/lightning/src/ln/channel.rs
Line 11200 in 6d9c676
core::mem::swap(&mutself.funding, funding);
Maybe you were looking at channel establishment?

Oh I see, i think what I was looking at when that FundedChannel was being created/updated here:
rust-lightning/lightning/src/ln/channel.rs
Line 2219 in e3ebe7a
self.phase = ChannelPhase::Funded(funded_channel);

Original context and motivation comes from here: lightningdevkit/ldk-node#677 (comment) When splicing-in, the default case is our channel utxo + our wallet utxos being combined. This works great however, it can give our wallet issues calculating fees after the fact because our wallet needs to know about our channel's utxo. We currently have it's outpoint and satoshi value available, but not its output script so we are unable to construct the TxOut for the channel. This adds the redeem script to the `ChannelDetails` and `ChannelPending` event which gives us enough information to be able to construct it.

TheBlueMatt · 2025-12-02T14:47:55Z

Backported in #4239.

benthecarman mentioned this pull request Nov 19, 2025
Channel splicing support lightningdevkit/ldk-node#677
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Add funding redeem script to `SplicePending' event
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Channel splicing support lightningdevkit/ldk-node#677
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Channel splicing support lightningdevkit/ldk-node#677
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jkczyz merged commit f325458 into lightningdevkit:mainNov 21, 2025
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benthecarman deleted the redeem-script-channel-pending-detials branch November 21, 2025 04:11

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Backport 4234 to 0.2 #4239
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benthecarman mentioned this pull request Nov 19, 2025
Channel splicing support lightningdevkit/ldk-node#677
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Comment threadlightning/src/events/mod.rs Outdated
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Comment threadlightning/src/ln/channel_state.rs Outdated
Comment threadlightning/src/ln/channel_state.rs Outdated

benthecarman force-pushed the redeem-script-channel-pending-detials branch from 1c29113 to 436dc4bCompare November 19, 2025 16:42

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benthecarman added 2 commits November 20, 2025 10:35

Add funding redeem script to `SplicePending' event
e3ebe7a

benthecarman force-pushed the redeem-script-channel-pending-detials branch from c5428d2 to e3ebe7aCompare November 20, 2025 16:35

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jkczyz merged commit f325458 into lightningdevkit:mainNov 21, 2025
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jkczyz added the backport 0.2 label Nov 21, 2025

benthecarman deleted the redeem-script-channel-pending-detials branch November 21, 2025 04:11

benthecarman mentioned this pull request Nov 21, 2025
Backport 4234 to 0.2 #4239
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TheBlueMatt removed the backport 0.2 label Dec 2, 2025

benthecarman mentioned this pull request Nov 19, 2025
Channel splicing support lightningdevkit/ldk-node#677
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benthecarman requested a review from jkczyz November 19, 2025 15:44

benthecarman force-pushed the redeem-script-channel-pending-detials branch 4 times, most recently from b2f8584 to 1c29113Compare November 19, 2025 16:24

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Comment threadlightning/src/events/mod.rs Outdated
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Comment threadlightning/src/ln/channel_state.rs Outdated
Comment threadlightning/src/ln/channel_state.rs Outdated

benthecarman force-pushed the redeem-script-channel-pending-detials branch from 1c29113 to 436dc4bCompare November 19, 2025 16:42

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benthecarman force-pushed the redeem-script-channel-pending-detials branch from 5b5c8d6 to c5428d2Compare November 20, 2025 15:43

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benthecarman added 2 commits November 20, 2025 10:35

Add funding redeem script to `SplicePending' event
e3ebe7a

benthecarman force-pushed the redeem-script-channel-pending-detials branch from c5428d2 to e3ebe7aCompare November 20, 2025 16:35

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jkczyz merged commit f325458 into lightningdevkit:mainNov 21, 2025
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jkczyz added the backport 0.2 label Nov 21, 2025

benthecarman deleted the redeem-script-channel-pending-detials branch November 21, 2025 04:11

benthecarman mentioned this pull request Nov 21, 2025
Backport 4234 to 0.2 #4239
Merged

TheBlueMatt removed the backport 0.2 label Dec 2, 2025

benthecarman mentioned this pull request Nov 19, 2025
Channel splicing support lightningdevkit/ldk-node#677
Merged

benthecarman requested a review from jkczyz November 19, 2025 15:44

benthecarman force-pushed the redeem-script-channel-pending-detials branch 4 times, most recently from b2f8584 to 1c29113Compare November 19, 2025 16:24

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Comment threadlightning/src/events/mod.rs Outdated
Comment threadlightning/src/events/mod.rs Outdated
Comment threadlightning/src/ln/channel_state.rs Outdated
Comment threadlightning/src/ln/channel_state.rs Outdated

benthecarman force-pushed the redeem-script-channel-pending-detials branch from 1c29113 to 436dc4bCompare November 19, 2025 16:42

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benthecarman force-pushed the redeem-script-channel-pending-detials branch 2 times, most recently from e0c0b62 to 5b5c8d6Compare November 19, 2025 20:06

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benthecarman dismissed jkczyz’s stale review via c5428d2November 20, 2025 15:43

benthecarman force-pushed the redeem-script-channel-pending-detials branch from 5b5c8d6 to c5428d2Compare November 20, 2025 15:43

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benthecarman added 2 commits November 20, 2025 10:35

Add funding redeem script to `SplicePending' event
e3ebe7a

benthecarman force-pushed the redeem-script-channel-pending-detials branch from c5428d2 to e3ebe7aCompare November 20, 2025 16:35

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jkczyz merged commit f325458 into lightningdevkit:mainNov 21, 2025
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jkczyz added the backport 0.2 label Nov 21, 2025

benthecarman deleted the redeem-script-channel-pending-detials branch November 21, 2025 04:11

benthecarman mentioned this pull request Nov 21, 2025
Backport 4234 to 0.2 #4239
Merged

TheBlueMatt removed the backport 0.2 label Dec 2, 2025

		/// During a splice, the funding output will change and this value will be updated
		/// after the `commitment_signed` messages have been exchanged.

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