From 7744c4152185ca2765bc45f008cd4bda929fcaab Mon Sep 17 00:00:00 2001
From: Rusty Russell <rusty@rustcorp.com.au>
Date: Wed, 19 Sep 2018 12:26:54 +0930
Subject: [PATCH] listpeers: add 'scratch_txid' for the tx we would broadcast
 if necessary.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
 CHANGELOG.md              | 2 ++
 lightningd/peer_control.c | 6 ++++++
 2 files changed, 8 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 39b11ed80..db1a501cb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ### Added
 
+- JSON API: `listpeers` has new field `scratch_txid`: the latest tx in channel.
+
 ### Changed
 
 ### Deprecated
diff --git a/lightningd/peer_control.c b/lightningd/peer_control.c
index cba4f5130..4dc9fa945 100644
--- a/lightningd/peer_control.c
+++ b/lightningd/peer_control.c
@@ -642,6 +642,12 @@ static void json_add_peer(struct lightningd *ld,
 		json_object_start(response, NULL);
 		json_add_string(response, "state",
 				channel_state_name(channel));
+		if (channel->last_tx) {
+			struct bitcoin_txid txid;
+			bitcoin_txid(channel->last_tx, &txid);
+
+			json_add_txid(response, "scratch_txid", &txid);
+		}
 		if (channel->owner)
 			json_add_string(response, "owner",
 					channel->owner->name);