diff --git a/contrib/signet/miner b/contrib/signet/miner
index 3c90fe96a1d..34a5b60daf6 100755
--- a/contrib/signet/miner
+++ b/contrib/signet/miner
@@ -223,12 +223,10 @@ def seconds_to_hms(s):
     return out
 
 class Generate:
-    INTERVAL = 600.0*2016/2015 # 10 minutes, adjusted for the off-by-one bug
-
 
     def __init__(self, multiminer=None, ultimate_target=None, poisson=False, max_interval=1800,
                  standby_delay=0, backup_delay=0, set_block_time=None,
-                 poolid=None):
+                 poolid=None, target_spacing=600):
         if multiminer is None:
             multiminer = (0, 1, 1)
         (self.multi_low, self.multi_high, self.multi_period) = multiminer
@@ -240,6 +238,10 @@ class Generate:
         self.set_block_time = set_block_time
         self.poolid = poolid
 
+        # Set INTERVAL. If target_spacing=600 (the default), it is 10 minutes,
+        # adjusted for the off-by-one bug.
+        self.INTERVAL = target_spacing * 2016 / 2015
+
     def next_block_delta(self, last_nbits, last_hash):
         # strategy:
         #  1) work out how far off our desired target we are
@@ -377,8 +379,9 @@ def do_generate(args):
             return 1
         my_blocks = (start-1, stop, total)
 
-    if args.max_interval < 960:
-        logging.error("--max-interval must be at least 960 (16 minutes)")
+    max_interval_limit = args.target_spacing * 16 / 10
+    if args.max_interval < max_interval_limit:
+        logging.error("--max-interval must be at least %d (%f minutes)" % (max_interval_limit, max_interval_limit/60))
         return 1
 
     poolid = get_poolid(args)
@@ -386,7 +389,7 @@ def do_generate(args):
     ultimate_target = nbits_to_target(int(args.nbits,16))
 
     gen = Generate(multiminer=my_blocks, ultimate_target=ultimate_target, poisson=args.poisson, max_interval=args.max_interval,
-                   standby_delay=args.standby_delay, backup_delay=args.backup_delay, set_block_time=args.set_block_time, poolid=poolid)
+                   standby_delay=args.standby_delay, backup_delay=args.backup_delay, set_block_time=args.set_block_time, poolid=poolid, target_spacing=args.target_spacing)
 
     mined_blocks = 0
     bestheader = {"hash": None}
@@ -529,6 +532,7 @@ def main():
     generate.add_argument("--backup-delay", default=300, type=int, help="Seconds to delay before mining blocks reserved for other miners (default=300)")
     generate.add_argument("--standby-delay", default=0, type=int, help="Seconds to delay before mining blocks (default=0)")
     generate.add_argument("--max-interval", default=1800, type=int, help="Maximum interblock interval (seconds)")
+    generate.add_argument("--target-spacing", default=600, type=int, help="Target interval between blocks (seconds), property of the network (default 600)")
 
     calibrate = cmds.add_parser("calibrate", help="Calibrate difficulty")
     calibrate.set_defaults(fn=do_calibrate)
diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 7966b80a273..73eb446a2c1 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -10,6 +10,7 @@
 #include <consensus/params.h>
 #include <deploymentinfo.h>
 #include <logging.h>
+#include <script/script.h>
 #include <tinyformat.h>
 #include <util/chaintype.h>
 #include <util/strencodings.h>
@@ -21,8 +22,83 @@
 #include <stdexcept>
 #include <vector>
 
+
 using util::SplitString;
 
+void ParseWrappedSignetChallenge(const std::vector<uint8_t>& wrappedChallenge, std::vector<uint8_t>& outParams, std::vector<uint8_t>& outChallenge) {
+    if (wrappedChallenge.empty() || wrappedChallenge[0] != OP_RETURN) {
+        // Not a wrapped challenge.
+        outChallenge = wrappedChallenge;
+        return;
+    }
+
+    std::vector<uint8_t> params;
+    std::vector<uint8_t> challenge;
+
+    const CScript script(wrappedChallenge.begin(), wrappedChallenge.end());
+    CScript::const_iterator it = script.begin(), itend = script.end();
+    int i;
+    for (i = 0; it != itend; i++) {
+        if (i > 2) {
+            throw std::runtime_error("too many operations in wrapped challenge, must be 3.");
+        }
+        std::vector<unsigned char> push_data;
+        opcodetype opcode;
+        if (!script.GetOp(it, opcode, push_data)) {
+            throw std::runtime_error(strprintf("failed to parse operation %d in wrapped challenge script.", i));
+        }
+        if (i == 0) {
+            // OP_RETURN.
+            continue;
+        }
+        if (opcode != OP_PUSHDATA1 && opcode != OP_PUSHDATA2 && opcode != OP_PUSHDATA4) {
+                throw std::runtime_error(strprintf("operation %d of wrapped challenge script must be a PUSHDATA opcode, got 0x%02x.", i, opcode));
+        }
+        if (i == 1) {
+            params.swap(push_data);
+        } else if (i == 2) {
+            challenge.swap(push_data);
+        }
+    }
+    if (i != 3) {
+        throw std::runtime_error(strprintf("too few operations in wrapped challenge, must be 3, got %d.", i));
+    }
+
+    outParams.swap(params);
+    outChallenge.swap(challenge);
+}
+
+void ParseSignetParams(const std::vector<uint8_t>& params, CChainParams::SigNetOptions& options) {
+    if (params.empty()) {
+        return;
+    }
+
+    // The format of params is extendable in case more fields are added in the future.
+    // It is encoded as a concatenation of (field_id, value) tuples, protobuf style.
+    // Currently there is only one field defined: pow_target_spacing, whose field_id
+    // is 0x01 and the lendth of encoding is 8 (int64_t). So valid values of params are:
+    //  - empty string (checked in if block above),
+    //  - 0x01 followed by 8 bytes of pow_target_spacing (9 bytes in total).
+    // If length is not 0 and not 9, the value can not be parsed.
+
+    if (params.size() != 1 + 8) {
+        throw std::runtime_error(strprintf("signet params must have length %d, got %d.", 1+8, params.size()));
+    }
+    if (params[0] != 0x01) {
+        throw std::runtime_error(strprintf("signet params[0] must be 0x01, got 0x%02x.", params[0]));
+    }
+    // Parse little-endian 64 bit number to uint8_t.
+    const uint8_t* bytes = &params[1];
+    const uint64_t value = uint64_t(bytes[0]) | uint64_t(bytes[1])<<8 | uint64_t(bytes[2])<<16 | uint64_t(bytes[3])<<24 |
+            uint64_t(bytes[4])<<32 | uint64_t(bytes[5])<<40 | uint64_t(bytes[6])<<48 | uint64_t(bytes[7])<<56;
+    auto pow_target_spacing = int64_t(value);
+    if (pow_target_spacing <= 0) {
+        throw std::runtime_error("signet param pow_target_spacing <= 0.");
+    }
+
+    options.pow_target_spacing = pow_target_spacing;
+}
+
 void ReadSigNetArgs(const ArgsManager& args, CChainParams::SigNetOptions& options)
 {
     if (args.IsArgSet("-signetseednode")) {
@@ -37,7 +113,11 @@ void ReadSigNetArgs(const ArgsManager& args, CChainParams::SigNetOptions& option
         if (!val) {
             throw std::runtime_error(strprintf("-signetchallenge must be hex, not '%s'.", signet_challenge[0]));
         }
-        options.challenge.emplace(*val);
+        std::vector<unsigned char> params;
+        std::vector<unsigned char> challenge;
+        ParseWrappedSignetChallenge(*val, params, challenge);
+        ParseSignetParams(params, options);
+        options.challenge.emplace(challenge);
     }
 }
 
diff --git a/src/chainparams.h b/src/chainparams.h
index 4743e022dbb..7d13a2c0fba 100644
--- a/src/chainparams.h
+++ b/src/chainparams.h
@@ -28,4 +28,26 @@ const CChainParams &Params();
  */
 void SelectParams(const ChainType chain);
 
+/**
+ * Extracts signet params and signet challenge from wrapped signet challenge.
+ * Format of wrapped signet challenge is:
+ * If the challenge is in the form "OP_RETURN PUSHDATA<params> PUSHDATA<actual challenge>",
+ * If the input challenge does not start with OP_RETURN,
+ * sets outParams="" and outChallenge=input.
+ * If the input challenge starts with OP_RETURN, but does not satisfy the format,
+ * throws an exception.
+ */
+void ParseWrappedSignetChallenge(const std::vector<uint8_t>& wrappedChallenge, std::vector<uint8_t>& outParams, std::vector<uint8_t>& outChallenge);
+
+/**
+ * Parses signet options.
+ * The format currently supports only setting pow_target_spacing, but
+ * can be extended in the future.
+ * Possible values:
+ *  - Empty (then do nothing)
+ *  - 0x01 (pow_target_spacing as int64_t little endian) => set pow_target_spacing.
+ * If the format is wrong, throws an exception.
+ */
+void ParseSignetParams(const std::vector<uint8_t>& params, CChainParams::SigNetOptions& options);
+
 #endif // BITCOIN_CHAINPARAMS_H
diff --git a/src/chainparamsbase.cpp b/src/chainparamsbase.cpp
index 060d519d920..3c77708a4e9 100644
--- a/src/chainparamsbase.cpp
+++ b/src/chainparamsbase.cpp
@@ -21,7 +21,7 @@ void SetupChainParamsBaseOptions(ArgsManager& argsman)
     argsman.AddArg("-testnet4", "Use the testnet4 chain. Equivalent to -chain=testnet4.", ArgsManager::ALLOW_ANY, OptionsCategory::CHAINPARAMS);
     argsman.AddArg("-vbparams=deployment:start:end[:min_activation_height]", "Use given start/end times and min_activation_height for specified version bits deployment (regtest-only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
     argsman.AddArg("-signet", "Use the signet chain. Equivalent to -chain=signet. Note that the network is defined by the -signetchallenge parameter", ArgsManager::ALLOW_ANY, OptionsCategory::CHAINPARAMS);
-    argsman.AddArg("-signetchallenge", "Blocks must satisfy the given script to be considered valid (only for signet networks; defaults to the global default signet test network challenge)", ArgsManager::ALLOW_ANY | ArgsManager::DISALLOW_NEGATION, OptionsCategory::CHAINPARAMS);
+    argsman.AddArg("-signetchallenge", "Blocks must satisfy the given script to be considered valid (only for signet networks; defaults to the global default signet test network challenge); in case -signetchallenge is in the form of 'OP_RETURN PUSHDATA<params> PUSHDATA<actual challenge>', then <actual challenge> is used as a challenge and <params> is used to set parameters of signet; currently the only supported parameter is target spacing, the format of <params> to set it is 01<8 bytes value of target spacing, seconds, little endian>", ArgsManager::ALLOW_ANY | ArgsManager::DISALLOW_NEGATION, OptionsCategory::CHAINPARAMS);
     argsman.AddArg("-signetseednode", "Specify a seed node for the signet network, in the hostname[:port] format, e.g. sig.net:1234 (may be used multiple times to specify multiple seed nodes; defaults to the global default signet test network seed node(s))", ArgsManager::ALLOW_ANY | ArgsManager::DISALLOW_NEGATION, OptionsCategory::CHAINPARAMS);
 }
 
diff --git a/src/kernel/chainparams.cpp b/src/kernel/chainparams.cpp
index 349e14a5d6e..fa6b091205b 100644
--- a/src/kernel/chainparams.cpp
+++ b/src/kernel/chainparams.cpp
@@ -461,7 +461,7 @@ public:
         consensus.CSVHeight = 1;
         consensus.SegwitHeight = 1;
         consensus.nPowTargetTimespan = 14 * 24 * 60 * 60; // two weeks
-        consensus.nPowTargetSpacing = 10 * 60;
+        consensus.nPowTargetSpacing = options.pow_target_spacing;
         consensus.fPowAllowMinDifficultyBlocks = false;
         consensus.enforce_BIP94 = false;
         consensus.fPowNoRetargeting = false;
diff --git a/src/kernel/chainparams.h b/src/kernel/chainparams.h
index f7ea141c37c..d9621b91700 100644
--- a/src/kernel/chainparams.h
+++ b/src/kernel/chainparams.h
@@ -137,6 +137,7 @@ public:
     struct SigNetOptions {
         std::optional<std::vector<uint8_t>> challenge{};
         std::optional<std::vector<std::string>> seeds{};
+        int64_t pow_target_spacing{10 * 60};
     };
 
     /**
diff --git a/src/test/CMakeLists.txt b/src/test/CMakeLists.txt
index 859b9132067..05494376df9 100644
--- a/src/test/CMakeLists.txt
+++ b/src/test/CMakeLists.txt
@@ -47,6 +47,7 @@ add_executable(test_bitcoin
   blockmanager_tests.cpp
   bloom_tests.cpp
   bswap_tests.cpp
+  chainparams_tests.cpp
   checkqueue_tests.cpp
   cluster_linearize_tests.cpp
   coins_tests.cpp
diff --git a/src/test/chainparams_tests.cpp b/src/test/chainparams_tests.cpp
new file mode 100644
index 00000000000..f7cfbcb3b06
--- /dev/null
+++ b/src/test/chainparams_tests.cpp
@@ -0,0 +1,170 @@
+// Copyright (c) 2011-2024 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <chainparams.h>
+
+#include <boost/test/unit_test.hpp>
+
+#include <util/strencodings.h>
+
+using namespace std::literals;
+
+BOOST_AUTO_TEST_SUITE(chainparams_tests)
+
+struct ParseWrappedSignetChallenge_TestCase
+{
+        std::string wrappedChallengeHex;
+        std::string wantParamsHex;
+        std::string wantChallengeHex;
+        std::string wantError;
+};
+
+BOOST_AUTO_TEST_CASE(parse_wrapped_signet_challenge)
+{
+    static const ParseWrappedSignetChallenge_TestCase cases[] = {
+            {
+                    "512103ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d1e086be430210359ef5021964fe22d6f8e05b2463c9540ce96883fe3b278760f048f5189f2e6c452ae",
+                    "",
+                    "512103ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d1e086be430210359ef5021964fe22d6f8e05b2463c9540ce96883fe3b278760f048f5189f2e6c452ae",
+                    "",
+            },
+            {
+                    "6a4c09011e000000000000004c25512102f7561d208dd9ae99bf497273e16f389bdbd6c4742ddb8e6b216e64fa2928ad8f51ae",
+                    "011e00000000000000",
+                    "512102f7561d208dd9ae99bf497273e16f389bdbd6c4742ddb8e6b216e64fa2928ad8f51ae",
+                    "",
+            },
+            {
+                    "6a4c004c25512102f7561d208dd9ae99bf497273e16f389bdbd6c4742ddb8e6b216e64fa2928ad8f51ae",
+                    "",
+                    "512102f7561d208dd9ae99bf497273e16f389bdbd6c4742ddb8e6b216e64fa2928ad8f51ae",
+                    "",
+            },
+            {
+                    "6a4c004c25512102f7561d208dd9ae99bf497273e16f389bdbd6c4742ddb8e6b216e64fa2928ad8f51ae4c00",
+                    "",
+                    "",
+                    "too many operations in wrapped challenge, must be 3.",
+            },
+            {
+                    "6a4c09011e00000000000000",
+                    "",
+                    "",
+                    "too few operations in wrapped challenge, must be 3, got 2.",
+            },
+            {
+                    "6a4c01",
+                    "",
+                    "",
+                    "failed to parse operation 1 in wrapped challenge script.",
+            },
+            {
+                    "6a4c004c25512102f7561d208dd9ae99bf497273",
+                    "",
+                    "",
+                    "failed to parse operation 2 in wrapped challenge script.",
+            },
+            {
+                    "6a6a4c25512102f7561d208dd9ae99bf497273e16f389bdbd6c4742ddb8e6b216e64fa2928ad8f51ae4c00",
+                    "",
+                    "",
+                    "operation 1 of wrapped challenge script must be a PUSHDATA opcode, got 0x6a.",
+            },
+            {
+                    "6a4c09011e0000000000000051",
+                    "",
+                    "",
+                    "operation 2 of wrapped challenge script must be a PUSHDATA opcode, got 0x51.",
+            },
+    };
+
+    for (unsigned int i=0; i<std::size(cases); i++)
+    {
+        const auto wrappedChallenge = ParseHex(cases[i].wrappedChallengeHex);
+        const auto wantParamsHex = cases[i].wantParamsHex;
+        const auto wantChallengeHex = cases[i].wantChallengeHex;
+        const auto wantError = cases[i].wantError;
+
+        std::vector<uint8_t> gotParams;
+        std::vector<uint8_t> gotChallenge;
+        std::string gotError;
+        try {
+            ParseWrappedSignetChallenge(wrappedChallenge, gotParams, gotChallenge);
+        } catch (const std::exception& e) {
+            gotError = e.what();
+        }
+
+        BOOST_CHECK_EQUAL(HexStr(gotParams), wantParamsHex);
+        BOOST_CHECK_EQUAL(HexStr(gotChallenge), wantChallengeHex);
+        BOOST_CHECK_EQUAL(gotError, wantError);
+    }
+}
+
+struct ParseSignetParams_TestCase
+{
+        std::string paramsHex;
+        int64_t wantPowTargetSpacing;
+        std::string wantError;
+};
+
+BOOST_AUTO_TEST_CASE(parse_signet_params)
+{
+    static const ParseSignetParams_TestCase cases[] = {
+            {
+                    "",
+                    600,
+                    "",
+            },
+            {
+                    "011e00000000000000",
+                    30,
+                    "",
+            },
+            {
+                    "01e803000000000000",
+                    1000,
+                    "",
+            },
+            {
+                    "015802000000000000",
+                    600,
+                    "",
+            },
+            {
+                    "012502",
+                    600,
+                    "signet params must have length 9, got 3.",
+            },
+            {
+                    "022502000000000000",
+                    600,
+                    "signet params[0] must be 0x01, got 0x02.",
+            },
+            {
+                    "01ffffffffffffffff",
+                    600,
+                    "signet param pow_target_spacing <= 0.",
+            },
+    };
+
+    for (unsigned int i=0; i<std::size(cases); i++)
+    {
+        const auto params = ParseHex(cases[i].paramsHex);
+        const auto wantPowTargetSpacing = cases[i].wantPowTargetSpacing;
+        const auto wantError = cases[i].wantError;
+
+        CChainParams::SigNetOptions gotOptions;
+        std::string gotError;
+        try {
+            ParseSignetParams(params, gotOptions);
+        } catch (const std::exception& e) {
+            gotError = e.what();
+        }
+
+        BOOST_CHECK_EQUAL(gotOptions.pow_target_spacing, wantPowTargetSpacing);
+        BOOST_CHECK_EQUAL(gotError, wantError);
+    }
+}
+
+BOOST_AUTO_TEST_SUITE_END()
diff --git a/src/test/validation_tests.cpp b/src/test/validation_tests.cpp
index 2e378ed30b5..dae5efd659c 100644
--- a/src/test/validation_tests.cpp
+++ b/src/test/validation_tests.cpp
@@ -75,6 +75,15 @@ BOOST_AUTO_TEST_CASE(signet_parse_tests)
     BOOST_CHECK(signet_params->GetConsensus().signet_challenge == std::vector<uint8_t>{OP_TRUE});
     CScript challenge{OP_TRUE};
 
+    {
+        // Wrapped challenge case.
+        ArgsManager signet_argsman_custom_spacing;
+        signet_argsman_custom_spacing.ForceSetArg("-signetchallenge", "6a4c09011e000000000000004c0151"); // set challenge to OP_TRUE and spacing to 30 seconds
+        const auto signet_params_custom_spacing = CreateChainParams(signet_argsman_custom_spacing, ChainType::SIGNET);
+        BOOST_CHECK(signet_params_custom_spacing->GetConsensus().signet_challenge == std::vector<uint8_t>{OP_TRUE});
+        BOOST_CHECK(signet_params_custom_spacing->GetConsensus().nPowTargetSpacing == 30);
+    }
+
     // empty block is invalid
     BOOST_CHECK(!SignetTxs::Create(block, challenge));
     BOOST_CHECK(!CheckSignetBlockSolution(block, signet_params->GetConsensus()));
diff --git a/test/functional/feature_signet.py b/test/functional/feature_signet.py
index 63091b3ee87..bb13a1a683f 100755
--- a/test/functional/feature_signet.py
+++ b/test/functional/feature_signet.py
@@ -25,7 +25,7 @@ signet_blocks = [
 ]
 
 class SignetParams:
-    def __init__(self, challenge=None):
+    def __init__(self, challenge=None, internal_challenge=None):
         if challenge is None:
             self.challenge = SIGNET_DEFAULT_CHALLENGE
             self.shared_args = []
@@ -33,22 +33,28 @@ class SignetParams:
             self.challenge = challenge
             self.shared_args = [f"-signetchallenge={challenge}"]
 
+        if internal_challenge is None:
+            internal_challenge = self.challenge
+        self.internal_challenge = internal_challenge
+
 class SignetBasicTest(BitcoinTestFramework):
     def set_test_params(self):
         self.chain = "signet"
-        self.num_nodes = 6
+        self.num_nodes = 8
         self.setup_clean_chain = True
         self.signets = [
             SignetParams(challenge='51'), # OP_TRUE
             SignetParams(), # default challenge
             # default challenge as a 2-of-2, which means it should fail
-            SignetParams(challenge='522103ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d1e086be430210359ef5021964fe22d6f8e05b2463c9540ce96883fe3b278760f048f5189f2e6c452ae')
+            SignetParams(challenge='522103ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d1e086be430210359ef5021964fe22d6f8e05b2463c9540ce96883fe3b278760f048f5189f2e6c452ae'),
+            SignetParams(challenge='6a4c09011e000000000000004c0151', internal_challenge='51'), # OP_TRUE, target_spacing=30
         ]
 
         self.extra_args = [
             self.signets[0].shared_args, self.signets[0].shared_args,
             self.signets[1].shared_args, self.signets[1].shared_args,
             self.signets[2].shared_args, self.signets[2].shared_args,
+            self.signets[3].shared_args, self.signets[3].shared_args,
         ]
 
     def setup_network(self):
@@ -58,6 +64,7 @@ class SignetBasicTest(BitcoinTestFramework):
         self.connect_nodes(0, 1)
         self.connect_nodes(2, 3)
         self.connect_nodes(4, 5)
+        self.connect_nodes(6, 7)
 
     def run_test(self):
         self.log.info("basic tests using OP_TRUE challenge")
@@ -66,10 +73,11 @@ class SignetBasicTest(BitcoinTestFramework):
         def check_getblockchaininfo(node_idx, signet_idx):
             blockchain_info = self.nodes[node_idx].getblockchaininfo()
             assert_equal(blockchain_info['chain'], 'signet')
-            assert_equal(blockchain_info['signet_challenge'], self.signets[signet_idx].challenge)
+            assert_equal(blockchain_info['signet_challenge'], self.signets[signet_idx].internal_challenge)
         check_getblockchaininfo(node_idx=1, signet_idx=0)
         check_getblockchaininfo(node_idx=2, signet_idx=1)
         check_getblockchaininfo(node_idx=5, signet_idx=2)
+        check_getblockchaininfo(node_idx=6, signet_idx=3)
 
         self.log.info('getmininginfo')
         def check_getmininginfo(node_idx, signet_idx):
@@ -80,20 +88,26 @@ class SignetBasicTest(BitcoinTestFramework):
             assert 'currentblockweight' not in mining_info
             assert_equal(mining_info['networkhashps'], Decimal('0'))
             assert_equal(mining_info['pooledtx'], 0)
-            assert_equal(mining_info['signet_challenge'], self.signets[signet_idx].challenge)
+            assert_equal(mining_info['signet_challenge'], self.signets[signet_idx].internal_challenge)
         check_getmininginfo(node_idx=0, signet_idx=0)
         check_getmininginfo(node_idx=3, signet_idx=1)
         check_getmininginfo(node_idx=4, signet_idx=2)
+        check_getmininginfo(node_idx=7, signet_idx=3)
 
         self.generate(self.nodes[0], 1, sync_fun=self.no_op)
 
         self.log.info("pregenerated signet blocks check")
 
-        height = 0
-        for block in signet_blocks:
-            assert_equal(self.nodes[2].submitblock(block), None)
-            height += 1
-            assert_equal(self.nodes[2].getblockcount(), height)
+        # Verify that nodes accept blocks mined using the default signet challenge.
+        # This test includes one default signet node (2) and another node (6)
+        # configured with an extended signet challenge that uses the actual script
+        # OP_TRUE (accepts all blocks).
+        for node_idx in [2, 6]:
+            height = 0
+            for block in signet_blocks:
+                assert_equal(self.nodes[node_idx].submitblock(block), None)
+                height += 1
+                assert_equal(self.nodes[node_idx].getblockcount(), height)
 
         self.log.info("pregenerated signet blocks check (incompatible solution)")