ElementsProject · rustyrussell · Apr 9, 2026 · Apr 2, 2026 · Apr 2, 2026 · Apr 7, 2026
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
@@ -500,7 +500,6 @@ jobs:
         env:
           COMPILER: ${{ matrix.COMPILER }}
           EXPERIMENTAL_DUAL_FUND: ${{ matrix.EXPERIMENTAL_DUAL_FUND }}
-          EXPERIMENTAL_SPLICING: ${{ matrix.EXPERIMENTAL_SPLICING }}
           COMPAT: 1
           SLOW_MACHINE: 1
           TEST_DEBUG: 1
@@ -553,13 +552,6 @@ jobs:
             COMPILER: gcc
             TEST_NETWORK: regtest
             EXPERIMENTAL_DUAL_FUND: 1
-          # And splicing!
-          - NAME: splicing
-            CFG: compile-gcc-O3
-            TEST_DB_PROVIDER: sqlite3
-            COMPILER: gcc
-            TEST_NETWORK: regtest
-            EXPERIMENTAL_SPLICING: 1
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -606,7 +598,6 @@ jobs:
         env:
           COMPILER: ${{ matrix.COMPILER }}
           EXPERIMENTAL_DUAL_FUND: ${{ matrix.EXPERIMENTAL_DUAL_FUND }}
-          EXPERIMENTAL_SPLICING: ${{ matrix.EXPERIMENTAL_SPLICING }}
           COMPAT: 1
           SLOW_MACHINE: 1
           TEST_DEBUG: 1

diff --git a/.msggen.json b/.msggen.json
@@ -9785,7 +9785,7 @@
         },
         "ListConfigs.configs.experimental-splicing": {
             "added": "v23.08",
-            "deprecated": null
+            "deprecated": "v26.04"
         },
         "ListConfigs.configs.experimental-splicing.set": {
             "added": "pre-v0.10.1",

diff --git a/Makefile b/Makefile
@@ -674,7 +674,7 @@ gen:  $(CHECK_GEN_ALL)
 
 check-gen-updated:  $(CHECK_GEN_ALL)
 	@echo "Checking for generated files being changed by make"
-	git diff --exit-code HEAD
+	git diff --text --exit-code HEAD
 
 coverage/coverage.info: check pytest
 	mkdir coverage || true

diff --git a/common/features.c b/common/features.c
@@ -140,10 +140,6 @@ static const struct feature_style feature_styles[] = {
 	  .copy_style = { [INIT_FEATURE] = FEATURE_REPRESENT,
 			  [NODE_ANNOUNCE_FEATURE] = FEATURE_REPRESENT,
 			  [CHANNEL_FEATURE] = FEATURE_DONT_REPRESENT} },
-	{ OPT_EXPERIMENTAL_SPLICE,
-	  .copy_style = { [INIT_FEATURE] = FEATURE_REPRESENT,
-			  [NODE_ANNOUNCE_FEATURE] = FEATURE_REPRESENT,
-			  [CHANNEL_FEATURE] = FEATURE_DONT_REPRESENT} },
 };
 
 struct dependency {

diff --git a/common/features.h b/common/features.h
@@ -122,6 +122,8 @@ struct feature_set *feature_set_dup(const tal_t *ctx,
  * | 46/47 | `option_scid_alias`               | ... IN ...
  * | 48/49 | `option_payment_metadata`         |...  9 ...
  * | 50/51 | `option_zeroconf`                 | ... IN ...
+ * | 60/61 | `option_simple_close`             |... IN ...
+ * | 62/63 | `option_splice`                   |... IN ...
  */
 #define OPT_DATA_LOSS_PROTECT			0
 #define OPT_UPFRONT_SHUTDOWN_SCRIPT		4
@@ -144,17 +146,12 @@ struct feature_set *feature_set_dup(const tal_t *ctx,
 #define OPT_SCID_ALIAS				46
 #define OPT_PAYMENT_METADATA			48
 #define OPT_ZEROCONF				50
+#define OPT_SPLICE				62
 
 /* The old pre-zero-fee-anchors were deprecated, and we never supported them
  * outside experimental options */
 #define OPT_ANCHOR_OUTPUTS_DEPRECATED		20
 
-/* BOLT-splice #9:
- * | 62/63 | `option_splice` |  ... IN ...
- */
-#define OPT_SPLICE				62
-#define OPT_EXPERIMENTAL_SPLICE			162
-
 #define OPT_SHUTDOWN_WRONG_FUNDING		104
 
 #endif /* LIGHTNING_COMMON_FEATURES_H */
@@ -11409,7 +11409,6 @@
       "added": "v24.11",
       "rpc": "dev-splice",
       "title": "Command to initiate a channel to a peer",
-      "warning": "experimental-splicing only",
       "description": [
         "`splice` is the command to move funds into or out of a channel. Multiple actions can be combined together resulting in a single onchain transaction. Funds may be moved out of a channel and into another in a single batch enabling cross-channel movement."
       ],
@@ -19300,6 +19299,10 @@
               },
               "experimental-splicing": {
                 "added": "v23.08",
+                "deprecated": [
+                  "v26.04",
+                  "v27.04"
+                ],
                 "type": "object",
                 "additionalProperties": false,
                 "required": [
@@ -33954,7 +33957,6 @@
       "added": "v23.08",
       "rpc": "splice_init",
       "title": "Command to initiate a channel to a peer",
-      "warning": "experimental-splicing only",
       "description": [
         "`splice_init` is a low level RPC command which initiates a channel splice for a given channel specified by `channel_id`."
       ],
@@ -34097,7 +34099,6 @@
       "added": "v23.08",
       "rpc": "splice_signed",
       "title": "Command to initiate a channel to a peer",
-      "warning": "experimental-splicing only",
       "description": [
         "`splice_signed` is a low level RPC command which finishes the active channel splice associated with `channel_id`.",
         "",
@@ -34265,7 +34266,6 @@
       "added": "v23.08",
       "rpc": "splice_update",
       "title": "Command to initiate a channel to a peer",
-      "warning": "experimental-splicing only",
       "description": [
         "`splice_update` is a low level RPC command which updates the active channel splice associated with `channel_id`.",
         "",
@@ -34432,7 +34432,6 @@
       "added": "v26.04",
       "rpc": "splicein",
       "title": "Command to splice funds into a channel",
-      "warning": "experimental-splicing only",
       "description": [
         "`splicein` is the command to move funds into a channel."
       ],
@@ -34499,7 +34498,6 @@
       "added": "v26.04",
       "rpc": "spliceout",
       "title": "Command to splice funds out of a channel",
-      "warning": "experimental-splicing only",
       "description": [
         "`spliceout` is the command to move funds into a channel."
       ],

@@ -82,7 +82,6 @@ def env(name, default=None):
 DEPRECATED_APIS = env("DEPRECATED_APIS", "0") == "1"
 TIMEOUT = int(env("TIMEOUT", 180 if SLOW_MACHINE else 60))
 EXPERIMENTAL_DUAL_FUND = env("EXPERIMENTAL_DUAL_FUND", "0") == "1"
-EXPERIMENTAL_SPLICING = env("EXPERIMENTAL_SPLICING", "0") == "1"
 GENERATE_EXAMPLES = env("GENERATE_EXAMPLES", "0") == "1"
 RUST = env("RUST", "0") == "1"
 
@@ -963,8 +962,6 @@ def __init__(self, node_id, lightning_dir, bitcoind, executor, may_fail=False,
             self.daemon.opts["dev-no-reconnect"] = None
         if EXPERIMENTAL_DUAL_FUND:
             self.daemon.opts["experimental-dual-fund"] = None
-        if EXPERIMENTAL_SPLICING:
-            self.daemon.opts["experimental-splicing"] = None
         # Avoid test flakes cause by this option unless explicitly set.
         if self.cln_version >= "v24.11":
             self.daemon.opts.update({"autoconnect-seeker-peers": 0})

diff --git a/contrib/startup_regtest.sh b/contrib/startup_regtest.sh
@@ -199,7 +199,6 @@ start_nodes() {
 		dev-fast-gossip
 		dev-bitcoind-poll=5
 		experimental-dual-fund
-		experimental-splicing
 		funder-policy=match
 		funder-policy-mod=100
 		funder-min-their-funding=10000

diff --git a/doc/contribute-to-core-lightning/testing.md b/doc/contribute-to-core-lightning/testing.md
@@ -63,7 +63,6 @@ Our Github Actions instance (see `.github/workflows/*.yml`) runs all these for e
 
 ```text
 EXPERIMENTAL_DUAL_FUND=[0|1]          - Enable dual-funding tests.
-EXPERIMENTAL_SPLICING=[0|1]           - Enable splicing tests.
 TEST_CHECK_DBSTMTS=[0|1]              - When running blackbox tests, this will
                                         load a plugin that logs all compiled
                                         and expanded database statements.

diff --git a/doc/developers-guide/deprecated-features.md b/doc/developers-guide/deprecated-features.md
@@ -23,6 +23,7 @@ privacy:
 | newaddr.addresstype.defaultbech32                  | Parameter          | v25.12           | v26.12         | Use `p2tr` in the response (present since v23.08 if `addresstype` is `p2tr`,  and always present since v24.12).           |
 | channel_state_changed.null_message                 | Notification Field | v25.12           | v26.12         | In channel_state_changed notification, `message` will be missing instead of `null`                                        |
 | hsmtool.getcodexsecret                             | Command            | v25.12.1         | v26.12         | Doesn't work on nodes using mnemonic secrets (v25.12 or later).  Use `getsecret` instead.                                 |
+| experimental_splicing                              | Config             | v26.04           | v27.04         | Splicing is now enabled by default                                                                                       |
 Inevitably there are features which need to change: either to be generalized, or removed when they can no longer be supported.
 
 Types of deprecation:

diff --git a/doc/lightningd-config.5.md b/doc/lightningd-config.5.md
@@ -862,6 +862,8 @@ The operations will be bundled into a single transaction. The channel will remai
 active while awaiting splice confirmation, however you can only spend the smaller
 of the prior channel balance and the new one.
 
+  (deprecated in v26.04)
+
 * **experimental-lsps-client**
 
   Specifying this enables client side support for the lsps protocol

diff --git a/doc/schemas/dev-splice.json b/doc/schemas/dev-splice.json
@@ -5,7 +5,6 @@
   "added": "v24.11",
   "rpc": "dev-splice",
   "title": "Command to initiate a channel to a peer",
-  "warning": "experimental-splicing only",
   "description": [
     "`splice` is the command to move funds into or out of a channel. Multiple actions can be combined together resulting in a single onchain transaction. Funds may be moved out of a channel and into another in a single batch enabling cross-channel movement."
   ],

diff --git a/doc/schemas/listconfigs.json b/doc/schemas/listconfigs.json
@@ -530,6 +530,10 @@
           },
           "experimental-splicing": {
             "added": "v23.08",
+            "deprecated": [
+              "v26.04",
+              "v27.04"
+            ],
             "type": "object",
             "additionalProperties": false,
             "required": [

diff --git a/doc/schemas/splice_init.json b/doc/schemas/splice_init.json
@@ -4,7 +4,6 @@
   "added": "v23.08",
   "rpc": "splice_init",
   "title": "Command to initiate a channel to a peer",
-  "warning": "experimental-splicing only",
   "description": [
     "`splice_init` is a low level RPC command which initiates a channel splice for a given channel specified by `channel_id`."
   ],

diff --git a/doc/schemas/splice_signed.json b/doc/schemas/splice_signed.json
@@ -4,7 +4,6 @@
   "added": "v23.08",
   "rpc": "splice_signed",
   "title": "Command to initiate a channel to a peer",
-  "warning": "experimental-splicing only",
   "description": [
     "`splice_signed` is a low level RPC command which finishes the active channel splice associated with `channel_id`.",
     "",

diff --git a/doc/schemas/splice_update.json b/doc/schemas/splice_update.json
@@ -4,7 +4,6 @@
   "added": "v23.08",
   "rpc": "splice_update",
   "title": "Command to initiate a channel to a peer",
-  "warning": "experimental-splicing only",
   "description": [
     "`splice_update` is a low level RPC command which updates the active channel splice associated with `channel_id`.",
     "",

diff --git a/doc/schemas/splicein.json b/doc/schemas/splicein.json
@@ -5,7 +5,6 @@
   "added": "v26.04",
   "rpc": "splicein",
   "title": "Command to splice funds into a channel",
-  "warning": "experimental-splicing only",
   "description": [
     "`splicein` is the command to move funds into a channel."
   ],

diff --git a/doc/schemas/spliceout.json b/doc/schemas/spliceout.json
@@ -5,7 +5,6 @@
   "added": "v26.04",
   "rpc": "spliceout",
   "title": "Command to splice funds out of a channel",
-  "warning": "experimental-splicing only",
   "description": [
     "`spliceout` is the command to move funds into a channel."
   ],

diff --git a/lightningd/hsm_control.c b/lightningd/hsm_control.c
@@ -186,7 +186,7 @@ struct ext_key *hsm_init(struct lightningd *ld)
 	if (feature_offered(ld->our_features->bits[INIT_FEATURE],
 			    OPT_SPLICE)
 	    && !hsm_capable(ld, WIRE_HSMD_SIGN_SPLICE_TX)) {
-		fatal("--experimental-splicing needs HSM capable of signing splices!");
+		fatal("splicing needs HSM capable of signing splices!");
 	}
 
 	/* Check if we have a mnemonic-based HSM secret from TLV */

diff --git a/lightningd/lightningd.c b/lightningd/lightningd.c
@@ -907,6 +907,7 @@ static struct feature_set *default_features(const tal_t *ctx)
 		OPTIONAL_FEATURE(OPT_PROVIDE_STORAGE),
 		/* Removed later for elements */
 		OPTIONAL_FEATURE(OPT_ANCHORS_ZERO_FEE_HTLC_TX),
+		OPTIONAL_FEATURE(OPT_SPLICE),
 	};
 
 	for (size_t i = 0; i < ARRAY_SIZE(features); i++) {

diff --git a/lightningd/options.c b/lightningd/options.c
@@ -1252,6 +1252,12 @@ static char *opt_set_dual_fund(struct lightningd *ld)
 
 static char *opt_set_splicing(struct lightningd *ld)
 {
+	/* Show deprecation warning */
+	if (!opt_deprecated_ok(ld, "experimental_splicing", NULL,
+			       "v26.04", "v27.04"))
+		return "--experimental-splicing is now enabled by default"
+		       " enabled by default";
+
 	feature_set_or(ld->our_features,
 		       take(feature_set_for_feature(NULL,
 						    OPTIONAL_FEATURE(OPT_SPLICE))));
@@ -1486,11 +1492,13 @@ static void register_opts(struct lightningd *ld)
 				 " and allow peers to establish channels"
 				 " via v2 channel open protocol.");
 
+	/* Deprecated: splicing is on by default now */
 	opt_register_early_noarg("--experimental-splicing",
 				 opt_set_splicing, ld,
 				 "experimental: Enables the ability to resize"
 				 " channels using splicing");
 
+
 	/* This affects our features, so set early. */
 	opt_register_early_noarg("--experimental-shutdown-wrong-funding",
 				 opt_set_shutdown_wrong_funding, ld,

diff --git a/plugins/spender/splice.c b/plugins/spender/splice.c
@@ -187,7 +187,7 @@ static struct command_result *do_fail(struct command *cmd,
 		   "splice_error(psbt:%p, splice_cmd:%p, str: %s)",
 		   splice_cmd->psbt, splice_cmd, str ?: "");
 
-	abort_pkg = tal(cmd->plugin, struct abort_pkg);
+	abort_pkg = tal(cmd, struct abort_pkg);
 	abort_pkg->splice_cmd = tal_steal(abort_pkg, splice_cmd);
 	abort_pkg->str = tal_strdup(abort_pkg, str);
 	abort_pkg->code = code;

diff --git a/tests/autogenerate-rpc-examples.py b/tests/autogenerate-rpc-examples.py
@@ -1318,7 +1318,6 @@ def generate_splice_examples(node_factory, bitcoind):
         # Basic setup for l7->l8
         options = [
             {
-                'experimental-splicing': None,
                 'allow-deprecated-apis': True,
                 'allow_bad_gossip': True,
                 'broken_log': '.*',

diff --git a/tests/test_askrene.py b/tests/test_askrene.py
@@ -2035,8 +2035,7 @@ def test_splice_dying_channel(node_factory, bitcoind):
     """We should NOT try to use the pre-splice channel here"""
     l1, l2, l3 = node_factory.line_graph(3,
                                          wait_for_announce=True,
-                                         fundamount=200000,
-                                         opts={'experimental-splicing': None})
+                                         fundamount=200000)
 
     chan_id = l1.get_channel_id(l2)
     funds_result = l1.rpc.addpsbtoutput(100000)

diff --git a/tests/test_gossip.py b/tests/test_gossip.py
@@ -1700,7 +1700,7 @@ def test_gossip_store_compact_while_extending(node_factory, bitcoind, executor):
         f.write(b'')
 
     fut.result(TIMEOUT)
-    # Exact gossip size varies with EXPERIMENTAL_SPLICING.
+    # Exact gossip size varies with SPLICING.
     l1.daemon.wait_for_logs(['gossipd: compaction done',
                              'connectd: Reopened gossip_store, reduced to offset 224[59]'])
 

diff --git a/tests/test_misc.py b/tests/test_misc.py
@@ -2501,7 +2501,8 @@ def test_list_features_only(node_factory):
                 'option_provide_storage/odd',
                 'option_channel_type/even',
                 'option_scid_alias/odd',
-                'option_zeroconf/odd']
+                'option_zeroconf/odd',
+                'option_splice/odd']
     expected += ['supports_open_accept_channel_type']
 
     assert features == expected