bitcoin-util: replace netmagic command with getchainparams command

diff --git a/doc/release-notes-35610.md b/doc/release-notes-35610.md
index 8e0dd208..1f80677e 100644
--- a/doc/release-notes-35610.md
+++ b/doc/release-notes-35610.md
@@ -1,6 +1,6 @@
 Tools and Utilities
 -------------------
 
-- A new `bitcoin-util netmagic` command returns the network magic of the
-  selected chain.
+- A new `bitcoin-util getchainparams` command returns hardcoded details
+  about the selected chain.
 
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 47266dcf..2b6840bb 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -388,6 +388,7 @@ if(BUILD_UTIL)
     core_interface
     bitcoin_common
     bitcoin_util
+    univalue
   )
   install_binary_component(bitcoin-util HAS_MANPAGE)
 endif()
diff --git a/src/bitcoin-util.cpp b/src/bitcoin-util.cpp
index f17c7a0d..7e774685 100644
--- a/src/bitcoin-util.cpp
+++ b/src/bitcoin-util.cpp
@@ -15,6 +15,7 @@
 #include <compat/compat.h>
 #include <core_io.h>
 #include <streams.h>
+#include <univalue.h>
 #include <util/exception.h>
 #include <util/strencodings.h>
 #include <util/translation.h>
@@ -36,7 +37,7 @@ static void SetupBitcoinUtilArgs(ArgsManager &argsman)
     argsman.AddArg("-version", "Print version and exit", ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
 
     argsman.AddCommand("grind", "Perform proof of work on hex header string");
-    argsman.AddCommand("netmagic", "Get the network magic bytes of the selected chain");
+    argsman.AddCommand("getchainparams", "Get hardcoded parameters for the selected chain");
 
     SetupChainParamsBaseOptions(argsman);
 }
@@ -151,14 +152,60 @@ static int Grind(const std::vector<std::string>& args, std::string& strPrint)
     return EXIT_SUCCESS;
 }
 
-static int NetMagic(const std::vector<std::string>& args, std::string& strPrint)
+static int GetChainParams(const std::vector<std::string>& args, std::string& strPrint)
 {
     if (!args.empty()) {
-        strPrint = "netmagic does not take arguments";
+        strPrint = "getchainparams does not take arguments";
         return EXIT_FAILURE;
     }
 
-    strPrint = HexStr(Params().MessageStart());
+    const auto& params = Params();
+    const auto& consensus = params.GetConsensus();
+
+    UniValue result{UniValue::VOBJ};
+    result.pushKV("chain", params.GetChainTypeString());
+    result.pushKV("test_chain", params.IsTestChain());
+    result.pushKV("genesis", HexStr(consensus.hashGenesisBlock));
+    result.pushKV("subsidy_halving_interval", consensus.nSubsidyHalvingInterval);
+
+    if (consensus.signet_blocks) {
+        UniValue signet{UniValue::VOBJ};
+        signet.pushKV("challenge", HexStr(consensus.signet_challenge));
+        result.pushKV("signet", signet);
+    }
+
+    {
+        UniValue pow{UniValue::VOBJ};
+        pow.pushKV("limit", consensus.powLimit.ToString());
+        if (!consensus.fPowNoRetargeting) {
+            pow.pushKV("target_spacing", TicksSeconds(consensus.PowTargetSpacing()));
+            pow.pushKV("difficulty_retarget_interval", consensus.DifficultyAdjustmentInterval());
+            std::string mindiff_blocks = (consensus.fPowAllowMinDifficultyBlocks ?
+                  (consensus.enforce_BIP94 ? "bip94" : "yes") : "no");
+            pow.pushKV("mindiff_blocks", mindiff_blocks);
+        }
+        result.pushKV("pow", pow);
+    }
+
+    {
+        UniValue net{UniValue::VOBJ};
+        net.pushKV("default_port", params.GetDefaultPort());
+        net.pushKV("magic", HexStr(params.MessageStart()));
+        UniValue dns{UniValue::VARR};
+        for (const auto& seed : params.DNSSeeds()) {
+            dns.push_back(seed);
+        }
+        net.pushKV("dns_seeds", dns);
+        result.pushKV("net", net);
+    }
+
+    {
+        UniValue addr{UniValue::VOBJ};
+        addr.pushKV("bech32_hrp", params.Bech32HRP());
+        result.pushKV("addresses", addr);
+    }
+
+    strPrint = result.write(/*prettyIndent=*/2);
     return EXIT_SUCCESS;
 }
 
@@ -191,8 +238,8 @@ MAIN_FUNCTION
     try {
         if (cmd->command == "grind") {
             ret = Grind(cmd->args, strPrint);
-        } else if (cmd->command == "netmagic") {
-            ret = NetMagic(cmd->args, strPrint);
+        } else if (cmd->command == "getchainparams") {
+            ret = GetChainParams(cmd->args, strPrint);
         } else {
             assert(false); // unknown command should be caught earlier
         }
diff --git a/test/functional/data/util/bitcoin-util-test.json b/test/functional/data/util/bitcoin-util-test.json
index 9c37a4e5..2aaffff4 100644
--- a/test/functional/data/util/bitcoin-util-test.json
+++ b/test/functional/data/util/bitcoin-util-test.json
@@ -31,52 +31,52 @@
   },
   {
     "exec": "./bitcoin-util",
-    "args": ["netmagic"],
+    "args": ["getchainparams"],
     "return_code": 0,
-    "output_cmp": "netmagic-mainnet.hex",
-    "description": "netmagic returns mainnet magic bytes"
+    "output_cmp": "getchainparams-mainnet.json",
+    "description": "getchainparams returns mainnet info"
   },
   {
     "exec": "./bitcoin-util",
-    "args": ["-regtest", "netmagic"],
+    "args": ["-regtest", "getchainparams"],
     "return_code": 0,
-    "output_cmp": "netmagic-regtest.hex",
-    "description": "netmagic returns regtest magic bytes"
+    "output_cmp": "getchainparams-regtest.json",
+    "description": "getchainparams returns regtest info"
   },
   {
     "exec": "./bitcoin-util",
-    "args": ["-testnet", "netmagic"],
+    "args": ["-testnet", "getchainparams"],
     "return_code": 0,
-    "output_cmp": "netmagic-testnet.hex",
-    "description": "netmagic returns testnet magic bytes"
+    "output_cmp": "getchainparams-testnet.json",
+    "description": "getchainparams returns testnet info"
   },
   {
     "exec": "./bitcoin-util",
-    "args": ["-testnet4", "netmagic"],
+    "args": ["-testnet4", "getchainparams"],
     "return_code": 0,
-    "output_cmp": "netmagic-testnet4.hex",
-    "description": "netmagic returns testnet4 magic bytes"
+    "output_cmp": "getchainparams-testnet4.json",
+    "description": "getchainparams returns testnet4 info"
   },
   {
     "exec": "./bitcoin-util",
-    "args": ["-signet", "netmagic"],
+    "args": ["-signet", "getchainparams"],
     "return_code": 0,
-    "output_cmp": "netmagic-signet.hex",
-    "description": "netmagic returns signet magic bytes"
+    "output_cmp": "getchainparams-signet.json",
+    "description": "getchainparams returns signet info"
   },
   {
     "exec": "./bitcoin-util",
-    "args": ["-signet", "-signetchallenge=512102f7561d208dd9ae99bf497273e16f389bdbd6c4742ddb8e6b216e64fa2928ad8f51ae", "netmagic"],
+    "args": ["-signet", "-signetchallenge=512102f7561d208dd9ae99bf497273e16f389bdbd6c4742ddb8e6b216e64fa2928ad8f51ae", "getchainparams"],
     "return_code": 0,
-    "output_cmp": "netmagic-signet-custom.hex",
-    "description": "netmagic returns custom signet magic bytes"
+    "output_cmp": "getchainparams-signet-custom.json",
+    "description": "getchainparams returns custom signet info"
   },
   {
     "exec": "./bitcoin-util",
-    "args": ["netmagic", "extra_arg"],
+    "args": ["getchainparams", "extra_arg"],
     "return_code": 1,
-    "error_txt": "netmagic does not take arguments",
-    "description": "netmagic rejects extra arguments"
+    "error_txt": "getchainparams does not take arguments",
+    "description": "getchainparams rejects extra arguments"
   },
   { "exec": "./bitcoin-tx",
     "args": ["-create", "nversion=1"],
diff --git a/test/functional/data/util/getchainparams-mainnet.json b/test/functional/data/util/getchainparams-mainnet.json
new file mode 100644
index 00000000..c0e0402c
--- /dev/null
+++ b/test/functional/data/util/getchainparams-mainnet.json
@@ -0,0 +1,28 @@
+{
+  "chain": "main",
+  "test_chain": false,
+  "genesis": "6fe28c0ab6f1b372c1a6a246ae63f74f931e8365e15a089c68d6190000000000",
+  "subsidy_halving_interval": 210000,
+  "pow": {
+    "limit": "00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+    "target_spacing": 600,
+    "difficulty_retarget_interval": 2016,
+    "mindiff_blocks": "no"
+  },
+  "net": {
+    "default_port": 8333,
+    "magic": "f9beb4d9",
+    "dns_seeds": [
+      "dnsseed.bluematt.me.",
+      "seed.bitcoin.jonasschnelli.ch.",
+      "seed.btc.petertodd.net.",
+      "seed.bitcoin.sprovoost.nl.",
+      "dnsseed.emzy.de.",
+      "seed.bitcoin.wiz.biz.",
+      "seed.mainnet.achownodes.xyz."
+    ]
+  },
+  "addresses": {
+    "bech32_hrp": "bc"
+  }
+}
diff --git a/test/functional/data/util/getchainparams-regtest.json b/test/functional/data/util/getchainparams-regtest.json
new file mode 100644
index 00000000..7a3191b7
--- /dev/null
+++ b/test/functional/data/util/getchainparams-regtest.json
@@ -0,0 +1,19 @@
+{
+  "chain": "regtest",
+  "test_chain": true,
+  "genesis": "06226e46111a0b59caaf126043eb5bbf28c34f3a5e332a1fc7b2b73cf188910f",
+  "subsidy_halving_interval": 150,
+  "pow": {
+    "limit": "7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+  },
+  "net": {
+    "default_port": 18444,
+    "magic": "fabfb5da",
+    "dns_seeds": [
+      "dummySeed.invalid."
+    ]
+  },
+  "addresses": {
+    "bech32_hrp": "bcrt"
+  }
+}
diff --git a/test/functional/data/util/getchainparams-signet-custom.json b/test/functional/data/util/getchainparams-signet-custom.json
new file mode 100644
index 00000000..4f5d5287
--- /dev/null
+++ b/test/functional/data/util/getchainparams-signet-custom.json
@@ -0,0 +1,24 @@
+{
+  "chain": "signet",
+  "test_chain": true,
+  "genesis": "f61eee3b63a380a477a063af32b2bbc97c9ff9f01f2c4225e973988108000000",
+  "subsidy_halving_interval": 210000,
+  "signet": {
+    "challenge": "512102f7561d208dd9ae99bf497273e16f389bdbd6c4742ddb8e6b216e64fa2928ad8f51ae"
+  },
+  "pow": {
+    "limit": "00000377ae000000000000000000000000000000000000000000000000000000",
+    "target_spacing": 600,
+    "difficulty_retarget_interval": 2016,
+    "mindiff_blocks": "no"
+  },
+  "net": {
+    "default_port": 38333,
+    "magic": "a5df2dcb",
+    "dns_seeds": [
+    ]
+  },
+  "addresses": {
+    "bech32_hrp": "tb"
+  }
+}
diff --git a/test/functional/data/util/getchainparams-signet.json b/test/functional/data/util/getchainparams-signet.json
new file mode 100644
index 00000000..91905976
--- /dev/null
+++ b/test/functional/data/util/getchainparams-signet.json
@@ -0,0 +1,26 @@
+{
+  "chain": "signet",
+  "test_chain": true,
+  "genesis": "f61eee3b63a380a477a063af32b2bbc97c9ff9f01f2c4225e973988108000000",
+  "subsidy_halving_interval": 210000,
+  "signet": {
+    "challenge": "512103ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d1e086be430210359ef5021964fe22d6f8e05b2463c9540ce96883fe3b278760f048f5189f2e6c452ae"
+  },
+  "pow": {
+    "limit": "00000377ae000000000000000000000000000000000000000000000000000000",
+    "target_spacing": 600,
+    "difficulty_retarget_interval": 2016,
+    "mindiff_blocks": "no"
+  },
+  "net": {
+    "default_port": 38333,
+    "magic": "0a03cf40",
+    "dns_seeds": [
+      "seed.signet.bitcoin.sprovoost.nl.",
+      "seed.signet.achownodes.xyz."
+    ]
+  },
+  "addresses": {
+    "bech32_hrp": "tb"
+  }
+}
diff --git a/test/functional/data/util/getchainparams-testnet.json b/test/functional/data/util/getchainparams-testnet.json
new file mode 100644
index 00000000..b0b8a4ea
--- /dev/null
+++ b/test/functional/data/util/getchainparams-testnet.json
@@ -0,0 +1,26 @@
+{
+  "chain": "test",
+  "test_chain": true,
+  "genesis": "43497fd7f826957108f4a30fd9cec3aeba79972084e90ead01ea330900000000",
+  "subsidy_halving_interval": 210000,
+  "pow": {
+    "limit": "00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+    "target_spacing": 600,
+    "difficulty_retarget_interval": 2016,
+    "mindiff_blocks": "yes"
+  },
+  "net": {
+    "default_port": 18333,
+    "magic": "0b110907",
+    "dns_seeds": [
+      "testnet-seed.bitcoin.jonasschnelli.ch.",
+      "seed.tbtc.petertodd.net.",
+      "seed.testnet.bitcoin.sprovoost.nl.",
+      "testnet-seed.bluematt.me.",
+      "seed.testnet.achownodes.xyz."
+    ]
+  },
+  "addresses": {
+    "bech32_hrp": "tb"
+  }
+}
diff --git a/test/functional/data/util/getchainparams-testnet4.json b/test/functional/data/util/getchainparams-testnet4.json
new file mode 100644
index 00000000..a59dd106
--- /dev/null
+++ b/test/functional/data/util/getchainparams-testnet4.json
@@ -0,0 +1,23 @@
+{
+  "chain": "testnet4",
+  "test_chain": true,
+  "genesis": "43f08bdab050e35b567c864b91f47f50ae725ae2de53bcfbbaf284da00000000",
+  "subsidy_halving_interval": 210000,
+  "pow": {
+    "limit": "00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+    "target_spacing": 600,
+    "difficulty_retarget_interval": 2016,
+    "mindiff_blocks": "bip94"
+  },
+  "net": {
+    "default_port": 48333,
+    "magic": "1c163f28",
+    "dns_seeds": [
+      "seed.testnet4.bitcoin.sprovoost.nl.",
+      "seed.testnet4.wiz.biz."
+    ]
+  },
+  "addresses": {
+    "bech32_hrp": "tb"
+  }
+}
diff --git a/test/functional/data/util/netmagic-mainnet.hex b/test/functional/data/util/netmagic-mainnet.hex
deleted file mode 100644
index 94b2c335..00000000
--- a/test/functional/data/util/netmagic-mainnet.hex
+++ /dev/null
@@ -1 +0,0 @@
-f9beb4d9
diff --git a/test/functional/data/util/netmagic-regtest.hex b/test/functional/data/util/netmagic-regtest.hex
deleted file mode 100644
index e2a9cb27..00000000
--- a/test/functional/data/util/netmagic-regtest.hex
+++ /dev/null
@@ -1 +0,0 @@
-fabfb5da
diff --git a/test/functional/data/util/netmagic-signet-custom.hex b/test/functional/data/util/netmagic-signet-custom.hex
deleted file mode 100644
index b24f8cb4..00000000
--- a/test/functional/data/util/netmagic-signet-custom.hex
+++ /dev/null
@@ -1 +0,0 @@
-a5df2dcb
diff --git a/test/functional/data/util/netmagic-signet.hex b/test/functional/data/util/netmagic-signet.hex
deleted file mode 100644
index 69a8b588..00000000
--- a/test/functional/data/util/netmagic-signet.hex
+++ /dev/null
@@ -1 +0,0 @@
-0a03cf40
diff --git a/test/functional/data/util/netmagic-testnet.hex b/test/functional/data/util/netmagic-testnet.hex
deleted file mode 100644
index 90b026d4..00000000
--- a/test/functional/data/util/netmagic-testnet.hex
+++ /dev/null
@@ -1 +0,0 @@
-0b110907
diff --git a/test/functional/data/util/netmagic-testnet4.hex b/test/functional/data/util/netmagic-testnet4.hex
deleted file mode 100644
index 8967d142..00000000
--- a/test/functional/data/util/netmagic-testnet4.hex
+++ /dev/null
@@ -1 +0,0 @@
-1c163f28