diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 0f947df63c..d7f7888ef3 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -265,19 +265,25 @@ class SigNetParams : public CChainParams {
         vSeeds.clear();
 
         if (!args.IsArgSet("-signetchallenge")) {
-            throw std::runtime_error(strprintf("%s: -signetchallenge is mandatory for signet networks", __func__));
-        }
-        const auto signet_challenge = args.GetArgs("-signetchallenge");
-        if (signet_challenge.size() != 1) {
-            throw std::runtime_error(strprintf("%s: -signetchallenge cannot be multiple values.", __func__));
+            LogPrintf("Using default signet network\n");
+            bin = ParseHex("512103ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d1e086be430210359ef5021964fe22d6f8e05b2463c9540ce96883fe3b278760f048f5189f2e6c452ae");
+            vSeeds.emplace_back("178.128.221.177");
+            vSeeds.emplace_back("2a01:7c8:d005:390::5");
+            vSeeds.emplace_back("ntv3mtqw5wt63red.onion:38333");
+        } else {
+            const auto signet_challenge = args.GetArgs("-signetchallenge");
+            if (signet_challenge.size() != 1) {
+                throw std::runtime_error(strprintf("%s: -signetchallenge cannot be multiple values.", __func__));
+            }
+            bin = ParseHex(signet_challenge[0]);
+
+            LogPrintf("Signet with challenge %s\n", signet_challenge[0]);
         }
-        bin = ParseHex(signet_challenge[0]);
+
         if (args.IsArgSet("-signetseednode")) {
             vSeeds = args.GetArgs("-signetseednode");
         }
 
-        LogPrintf("Signet with challenge %s\n", signet_challenge[0]);
-
         strNetworkID = CBaseChainParams::SIGNET;
         consensus.signet_blocks = true;
         consensus.signet_challenge.assign(bin.begin(), bin.end());
diff --git a/src/chainparamsbase.cpp b/src/chainparamsbase.cpp
index 1027e390ef..034e897ca6 100644
--- a/src/chainparamsbase.cpp
+++ b/src/chainparamsbase.cpp
@@ -25,8 +25,8 @@ void SetupChainParamsBaseOptions(ArgsManager& argsman)
     argsman.AddArg("-testnet", "Use the test chain. Equivalent to -chain=test.", ArgsManager::ALLOW_ANY, OptionsCategory::CHAINPARAMS);
     argsman.AddArg("-vbparams=deployment:start:end", "Use given start/end times for specified version bits deployment (regtest-only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
     argsman.AddArg("-signet", "Use the signet chain. 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)", ArgsManager::ALLOW_STRING, 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)", ArgsManager::ALLOW_STRING, 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_STRING, 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_STRING, OptionsCategory::CHAINPARAMS);
 }
 
 static std::unique_ptr<CBaseChainParams> globalChainBaseParams;