diff --git a/src/rpc/util.cpp b/src/rpc/util.cpp
index dfcff6ce5..9e1059d5e 100644
--- a/src/rpc/util.cpp
+++ b/src/rpc/util.cpp
@@ -1,893 +1,901 @@
 // Copyright (c) 2017-2019 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 <rpc/util.h>
 
 #include <key_io.h>
 #include <script/descriptor.h>
 #include <script/signingprovider.h>
 #include <tinyformat.h>
 #include <util/strencodings.h>
 #include <util/string.h>
 #include <util/translation.h>
 
 #include <tuple>
 
 #include <boost/algorithm/string/classification.hpp>
 #include <boost/algorithm/string/split.hpp>
 #include <boost/variant/static_visitor.hpp>
 
 const std::string UNIX_EPOCH_TIME = "UNIX epoch time";
 const std::string EXAMPLE_ADDRESS =
     "\"qrmzys48glkpevp2l4t24jtcltc9hyzx9cep2qffm4\"";
 
 void RPCTypeCheck(const UniValue &params,
                   const std::list<UniValueType> &typesExpected,
                   bool fAllowNull) {
     unsigned int i = 0;
     for (const UniValueType &t : typesExpected) {
         if (params.size() <= i) {
             break;
         }
 
         const UniValue &v = params[i];
         if (!(fAllowNull && v.isNull())) {
             RPCTypeCheckArgument(v, t);
         }
         i++;
     }
 }
 
 void RPCTypeCheckArgument(const UniValue &value,
                           const UniValueType &typeExpected) {
     if (!typeExpected.typeAny && value.type() != typeExpected.type) {
         throw JSONRPCError(RPC_TYPE_ERROR,
                            strprintf("Expected type %s, got %s",
                                      uvTypeName(typeExpected.type),
                                      uvTypeName(value.type())));
     }
 }
 
 void RPCTypeCheckObj(const UniValue &o,
                      const std::map<std::string, UniValueType> &typesExpected,
                      bool fAllowNull, bool fStrict) {
     for (const auto &t : typesExpected) {
         const UniValue &v = find_value(o, t.first);
         if (!fAllowNull && v.isNull()) {
             throw JSONRPCError(RPC_TYPE_ERROR,
                                strprintf("Missing %s", t.first));
         }
 
         if (!(t.second.typeAny || v.type() == t.second.type ||
               (fAllowNull && v.isNull()))) {
             std::string err = strprintf("Expected type %s for %s, got %s",
                                         uvTypeName(t.second.type), t.first,
                                         uvTypeName(v.type()));
             throw JSONRPCError(RPC_TYPE_ERROR, err);
         }
     }
 
     if (fStrict) {
         for (const std::string &k : o.getKeys()) {
             if (typesExpected.count(k) == 0) {
                 std::string err = strprintf("Unexpected key %s", k);
                 throw JSONRPCError(RPC_TYPE_ERROR, err);
             }
         }
     }
 }
 
 Amount AmountFromValue(const UniValue &value) {
     if (!value.isNum() && !value.isStr()) {
         throw JSONRPCError(RPC_TYPE_ERROR, "Amount is not a number or string");
     }
 
     int64_t n;
     if (!ParseFixedPoint(value.getValStr(), 8, &n)) {
         throw JSONRPCError(RPC_TYPE_ERROR, "Invalid amount");
     }
 
     Amount amt = n * SATOSHI;
     if (!MoneyRange(amt)) {
         throw JSONRPCError(RPC_TYPE_ERROR, "Amount out of range");
     }
 
     return amt;
 }
 
 uint256 ParseHashV(const UniValue &v, std::string strName) {
     std::string strHex(v.get_str());
     if (64 != strHex.length()) {
         throw JSONRPCError(
             RPC_INVALID_PARAMETER,
             strprintf("%s must be of length %d (not %d, for '%s')", strName, 64,
                       strHex.length(), strHex));
     }
     // Note: IsHex("") is false
     if (!IsHex(strHex)) {
         throw JSONRPCError(RPC_INVALID_PARAMETER,
                            strName + " must be hexadecimal string (not '" +
                                strHex + "')");
     }
     return uint256S(strHex);
 }
 
 uint256 ParseHashO(const UniValue &o, std::string strKey) {
     return ParseHashV(find_value(o, strKey), strKey);
 }
 
 std::vector<uint8_t> ParseHexV(const UniValue &v, std::string strName) {
     std::string strHex;
     if (v.isStr()) {
         strHex = v.get_str();
     }
     if (!IsHex(strHex)) {
         throw JSONRPCError(RPC_INVALID_PARAMETER,
                            strName + " must be hexadecimal string (not '" +
                                strHex + "')");
     }
 
     return ParseHex(strHex);
 }
 
 std::vector<uint8_t> ParseHexO(const UniValue &o, std::string strKey) {
     return ParseHexV(find_value(o, strKey), strKey);
 }
 
 std::string HelpExampleCli(const std::string &methodname,
                            const std::string &args) {
     return "> bitcoin-cli " + methodname + " " + args + "\n";
 }
 
 std::string HelpExampleRpc(const std::string &methodname,
                            const std::string &args) {
     return "> curl --user myusername --data-binary '{\"jsonrpc\": \"1.0\", "
            "\"id\": \"curltest\", "
            "\"method\": \"" +
            methodname + "\", \"params\": [" + args +
            "]}' -H 'content-type: text/plain;' http://127.0.0.1:8332/\n";
 }
 
 // Converts a hex string to a public key if possible
 CPubKey HexToPubKey(const std::string &hex_in) {
     if (!IsHex(hex_in)) {
         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY,
                            "Invalid public key: " + hex_in);
     }
     CPubKey vchPubKey(ParseHex(hex_in));
     if (!vchPubKey.IsFullyValid()) {
         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY,
                            "Invalid public key: " + hex_in);
     }
     return vchPubKey;
 }
 
 // Retrieves a public key for an address from the given FillableSigningProvider
 CPubKey AddrToPubKey(const CChainParams &chainparams,
                      const FillableSigningProvider &keystore,
                      const std::string &addr_in) {
     CTxDestination dest = DecodeDestination(addr_in, chainparams);
     if (!IsValidDestination(dest)) {
         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY,
                            "Invalid address: " + addr_in);
     }
     CKeyID key = GetKeyForDestination(keystore, dest);
     if (key.IsNull()) {
         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY,
                            strprintf("%s does not refer to a key", addr_in));
     }
     CPubKey vchPubKey;
     if (!keystore.GetPubKey(key, vchPubKey)) {
         throw JSONRPCError(
             RPC_INVALID_ADDRESS_OR_KEY,
             strprintf("no full public key for address %s", addr_in));
     }
     if (!vchPubKey.IsFullyValid()) {
         throw JSONRPCError(RPC_INTERNAL_ERROR,
                            "Wallet contains an invalid public key");
     }
     return vchPubKey;
 }
 
 // Creates a multisig address from a given list of public keys, number of
 // signatures required, and the address type
 CTxDestination AddAndGetMultisigDestination(const int required,
                                             const std::vector<CPubKey> &pubkeys,
                                             OutputType type,
                                             FillableSigningProvider &keystore,
                                             CScript &script_out) {
     // Gather public keys
     if (required < 1) {
         throw JSONRPCError(
             RPC_INVALID_PARAMETER,
             "a multisignature address must require at least one key to redeem");
     }
     if ((int)pubkeys.size() < required) {
         throw JSONRPCError(RPC_INVALID_PARAMETER,
                            strprintf("not enough keys supplied (got %u keys, "
                                      "but need at least %d to redeem)",
                                      pubkeys.size(), required));
     }
     if (pubkeys.size() > 16) {
         throw JSONRPCError(RPC_INVALID_PARAMETER,
                            "Number of keys involved in the multisignature "
                            "address creation > 16\nReduce the number");
     }
 
     script_out = GetScriptForMultisig(required, pubkeys);
 
     if (script_out.size() > MAX_SCRIPT_ELEMENT_SIZE) {
         throw JSONRPCError(
             RPC_INVALID_PARAMETER,
             (strprintf("redeemScript exceeds size limit: %d > %d",
                        script_out.size(), MAX_SCRIPT_ELEMENT_SIZE)));
     }
 
     // Check if any keys are uncompressed. If so, the type is legacy
     for (const CPubKey &pk : pubkeys) {
         if (!pk.IsCompressed()) {
             type = OutputType::LEGACY;
             break;
         }
     }
 
     // Make the address
     CTxDestination dest =
         AddAndGetDestinationForScript(keystore, script_out, type);
 
     return dest;
 }
 
 class DescribeAddressVisitor : public boost::static_visitor<UniValue> {
 public:
     explicit DescribeAddressVisitor() {}
 
     UniValue operator()(const CNoDestination &dest) const {
         return UniValue(UniValue::VOBJ);
     }
 
     UniValue operator()(const PKHash &keyID) const {
         UniValue obj(UniValue::VOBJ);
         obj.pushKV("isscript", false);
         return obj;
     }
 
     UniValue operator()(const ScriptHash &scriptID) const {
         UniValue obj(UniValue::VOBJ);
         obj.pushKV("isscript", true);
         return obj;
     }
 };
 
 UniValue DescribeAddress(const CTxDestination &dest) {
     return boost::apply_visitor(DescribeAddressVisitor(), dest);
 }
 
 RPCErrorCode RPCErrorFromTransactionError(TransactionError terr) {
     switch (terr) {
         case TransactionError::MEMPOOL_REJECTED:
             return RPC_TRANSACTION_REJECTED;
         case TransactionError::ALREADY_IN_CHAIN:
             return RPC_TRANSACTION_ALREADY_IN_CHAIN;
         case TransactionError::P2P_DISABLED:
             return RPC_CLIENT_P2P_DISABLED;
         case TransactionError::INVALID_PSBT:
         case TransactionError::PSBT_MISMATCH:
             return RPC_INVALID_PARAMETER;
         case TransactionError::SIGHASH_MISMATCH:
             return RPC_DESERIALIZATION_ERROR;
         default:
             break;
     }
     return RPC_TRANSACTION_ERROR;
 }
 
 UniValue JSONRPCTransactionError(TransactionError terr,
                                  const std::string &err_string) {
     if (err_string.length() > 0) {
         return JSONRPCError(RPCErrorFromTransactionError(terr), err_string);
     } else {
         return JSONRPCError(RPCErrorFromTransactionError(terr),
                             TransactionErrorString(terr).original);
     }
 }
 
 /**
  * A pair of strings that can be aligned (through padding) with other Sections
  * later on
  */
 struct Section {
     Section(const std::string &left, const std::string &right)
         : m_left{left}, m_right{right} {}
-    const std::string m_left;
+    std::string m_left;
     const std::string m_right;
 };
 
 /**
  * Keeps track of RPCArgs by transforming them into sections for the purpose
  * of serializing everything to a single string
  */
 struct Sections {
     std::vector<Section> m_sections;
     size_t m_max_pad{0};
 
     void PushSection(const Section &s) {
         m_max_pad = std::max(m_max_pad, s.m_left.size());
         m_sections.push_back(s);
     }
 
     /**
      * Recursive helper to translate an RPCArg into sections
      */
     void Push(const RPCArg &arg, const size_t current_indent = 5,
               const OuterType outer_type = OuterType::NONE) {
         const auto indent = std::string(current_indent, ' ');
         const auto indent_next = std::string(current_indent + 2, ' ');
         // Dictionary keys must have a name
         const bool push_name{outer_type == OuterType::OBJ};
 
         switch (arg.m_type) {
             case RPCArg::Type::STR_HEX:
             case RPCArg::Type::STR:
             case RPCArg::Type::NUM:
             case RPCArg::Type::AMOUNT:
             case RPCArg::Type::RANGE:
             case RPCArg::Type::BOOL: {
                 // Nothing more to do for non-recursive types on first recursion
                 if (outer_type == OuterType::NONE) {
                     return;
                 }
                 auto left = indent;
                 if (arg.m_type_str.size() != 0 && push_name) {
                     left +=
                         "\"" + arg.GetName() + "\": " + arg.m_type_str.at(0);
                 } else {
                     left += push_name ? arg.ToStringObj(/* oneline */ false)
                                       : arg.ToString(/* oneline */ false);
                 }
                 left += ",";
                 PushSection({left, arg.ToDescriptionString()});
                 break;
             }
             case RPCArg::Type::OBJ:
             case RPCArg::Type::OBJ_USER_KEYS: {
                 const auto right = outer_type == OuterType::NONE
                                        ? ""
                                        : arg.ToDescriptionString();
                 PushSection(
                     {indent + (push_name ? "\"" + arg.GetName() + "\": " : "") +
                          "{",
                      right});
                 for (const auto &arg_inner : arg.m_inner) {
                     Push(arg_inner, current_indent + 2, OuterType::OBJ);
                 }
                 if (arg.m_type != RPCArg::Type::OBJ) {
                     PushSection({indent_next + "...", ""});
                 }
                 PushSection(
                     {indent + "}" + (outer_type != OuterType::NONE ? "," : ""),
                      ""});
                 break;
             }
             case RPCArg::Type::ARR: {
                 auto left = indent;
                 left += push_name ? "\"" + arg.GetName() + "\": " : "";
                 left += "[";
                 const auto right = outer_type == OuterType::NONE
                                        ? ""
                                        : arg.ToDescriptionString();
                 PushSection({left, right});
                 for (const auto &arg_inner : arg.m_inner) {
                     Push(arg_inner, current_indent + 2, OuterType::ARR);
                 }
                 PushSection({indent_next + "...", ""});
                 PushSection(
                     {indent + "]" + (outer_type != OuterType::NONE ? "," : ""),
                      ""});
                 break;
             }
 
                 // no default case, so the compiler can warn about missing cases
         }
     }
 
     /**
      * Concatenate all sections with proper padding
      */
     std::string ToString() const {
         std::string ret;
         const size_t pad = m_max_pad + 4;
         for (const auto &s : m_sections) {
             if (s.m_right.empty()) {
                 ret += s.m_left;
                 ret += "\n";
                 continue;
             }
 
             std::string left = s.m_left;
             left.resize(pad, ' ');
             ret += left;
 
             // Properly pad after newlines
             std::string right;
             size_t begin = 0;
             size_t new_line_pos = s.m_right.find_first_of('\n');
             while (true) {
                 right += s.m_right.substr(begin, new_line_pos - begin);
                 if (new_line_pos == std::string::npos) {
                     // No new line
                     break;
                 }
                 right += "\n" + std::string(pad, ' ');
                 begin = s.m_right.find_first_not_of(' ', new_line_pos + 1);
                 if (begin == std::string::npos) {
                     break; // Empty line
                 }
                 new_line_pos = s.m_right.find_first_of('\n', begin + 1);
             }
             ret += right;
             ret += "\n";
         }
         return ret;
     }
 };
 
 RPCHelpMan::RPCHelpMan(std::string name_, std::string description,
                        std::vector<RPCArg> args, RPCResults results,
                        RPCExamples examples)
     : m_name{std::move(name_)}, m_description{std::move(description)},
       m_args{std::move(args)}, m_results{std::move(results)},
       m_examples{std::move(examples)} {
     std::set<std::string> named_args;
     for (const auto &arg : m_args) {
         std::vector<std::string> names;
         boost::split(names, arg.m_names, boost::is_any_of("|"));
         // Should have unique named arguments
         for (const std::string &name : names) {
             CHECK_NONFATAL(named_args.insert(name).second);
         }
     }
 }
 
 std::string RPCResults::ToDescriptionString() const {
     std::string result;
     for (const auto &r : m_results) {
         if (r.m_cond.empty()) {
             result += "\nResult:\n";
         } else {
             result += "\nResult (" + r.m_cond + "):\n";
         }
         Sections sections;
         r.ToSections(sections);
         result += sections.ToString();
     }
     return result;
 }
 
 std::string RPCExamples::ToDescriptionString() const {
     return m_examples.empty() ? m_examples : "\nExamples:\n" + m_examples;
 }
 
 bool RPCHelpMan::IsValidNumArgs(size_t num_args) const {
     size_t num_required_args = 0;
     for (size_t n = m_args.size(); n > 0; --n) {
         if (!m_args.at(n - 1).IsOptional()) {
             num_required_args = n;
             break;
         }
     }
     return num_required_args <= num_args && num_args <= m_args.size();
 }
 std::string RPCHelpMan::ToString() const {
     std::string ret;
 
     // Oneline summary
     ret += m_name;
     bool was_optional{false};
     for (const auto &arg : m_args) {
         const bool optional = arg.IsOptional();
         ret += " ";
         if (optional) {
             if (!was_optional) {
                 ret += "( ";
             }
             was_optional = true;
         } else {
             if (was_optional) {
                 ret += ") ";
             }
             was_optional = false;
         }
         ret += arg.ToString(/* oneline */ true);
     }
     if (was_optional) {
         ret += " )";
     }
     ret += "\n\n";
 
     // Description
     ret += m_description;
 
     // Arguments
     Sections sections;
     for (size_t i{0}; i < m_args.size(); ++i) {
         const auto &arg = m_args.at(i);
 
         if (i == 0) {
             ret += "\nArguments:\n";
         }
 
         // Push named argument name and description
         sections.m_sections.emplace_back(::ToString(i + 1) + ". " +
                                              arg.GetFirstName(),
                                          arg.ToDescriptionString());
         sections.m_max_pad = std::max(sections.m_max_pad,
                                       sections.m_sections.back().m_left.size());
 
         // Recursively push nested args
         sections.Push(arg);
     }
     ret += sections.ToString();
 
     // Result
     ret += m_results.ToDescriptionString();
 
     // Examples
     ret += m_examples.ToDescriptionString();
 
     return ret;
 }
 
 std::string RPCArg::GetFirstName() const {
     return m_names.substr(0, m_names.find("|"));
 }
 
 std::string RPCArg::GetName() const {
     CHECK_NONFATAL(std::string::npos == m_names.find("|"));
     return m_names;
 }
 
 bool RPCArg::IsOptional() const {
     if (m_fallback.which() == 1) {
         return true;
     } else {
         return RPCArg::Optional::NO != boost::get<RPCArg::Optional>(m_fallback);
     }
 }
 
 std::string RPCArg::ToDescriptionString() const {
     std::string ret;
     ret += "(";
     if (m_type_str.size() != 0) {
         ret += m_type_str.at(1);
     } else {
         switch (m_type) {
             case Type::STR_HEX:
             case Type::STR: {
                 ret += "string";
                 break;
             }
             case Type::NUM: {
                 ret += "numeric";
                 break;
             }
             case Type::AMOUNT: {
                 ret += "numeric or string";
                 break;
             }
             case Type::RANGE: {
                 ret += "numeric or array";
                 break;
             }
             case Type::BOOL: {
                 ret += "boolean";
                 break;
             }
             case Type::OBJ:
             case Type::OBJ_USER_KEYS: {
                 ret += "json object";
                 break;
             }
             case Type::ARR: {
                 ret += "json array";
                 break;
             }
 
                 // no default case, so the compiler can warn about missing cases
         }
     }
     if (m_fallback.which() == 1) {
         ret += ", optional, default=" + boost::get<std::string>(m_fallback);
     } else {
         switch (boost::get<RPCArg::Optional>(m_fallback)) {
             case RPCArg::Optional::OMITTED: {
                 // nothing to do. Element is treated as if not present and has
                 // no default value
                 break;
             }
             case RPCArg::Optional::OMITTED_NAMED_ARG: {
                 ret += ", optional"; // Default value is "null"
                 break;
             }
             case RPCArg::Optional::NO: {
                 ret += ", required";
                 break;
             }
 
                 // no default case, so the compiler can warn about missing cases
         }
     }
     ret += ")";
     ret += m_description.empty() ? "" : " " + m_description;
     return ret;
 }
 
 void RPCResult::ToSections(Sections &sections, const OuterType outer_type,
                            const int current_indent) const {
     // Indentation
     const std::string indent(current_indent, ' ');
     const std::string indent_next(current_indent + 2, ' ');
 
     // Elements in a JSON structure (dictionary or array) are separated by a
     // comma
     const std::string maybe_separator{outer_type != OuterType::NONE ? "," : ""};
 
     // The key name if recursed into an dictionary
     const std::string maybe_key{
         outer_type == OuterType::OBJ ? "\"" + this->m_key_name + "\" : " : ""};
 
     // Format description with type
     const auto Description = [&](const std::string &type) {
         return "(" + type + (this->m_optional ? ", optional" : "") + ")" +
                (this->m_description.empty() ? "" : " " + this->m_description);
     };
 
     switch (m_type) {
         case Type::ELISION: {
             // If the inner result is empty, use three dots for elision
             sections.PushSection({indent_next + "...", m_description});
             return;
         }
         case Type::NONE: {
             sections.PushSection({indent + "None", Description("json null")});
             return;
         }
         case Type::STR: {
             sections.PushSection(
                 {indent + maybe_key + "\"str\"" + maybe_separator,
                  Description("string")});
             return;
         }
         case Type::STR_AMOUNT: {
             sections.PushSection({indent + maybe_key + "n" + maybe_separator,
                                   Description("numeric")});
             return;
         }
         case Type::STR_HEX: {
             sections.PushSection(
                 {indent + maybe_key + "\"hex\"" + maybe_separator,
                  Description("string")});
             return;
         }
         case Type::NUM: {
             sections.PushSection({indent + maybe_key + "n" + maybe_separator,
                                   Description("numeric")});
             return;
         }
         case Type::NUM_TIME: {
             sections.PushSection({indent + maybe_key + "xxx" + maybe_separator,
                                   Description("numeric")});
             return;
         }
         case Type::BOOL: {
             sections.PushSection(
                 {indent + maybe_key + "true|false" + maybe_separator,
                  Description("boolean")});
             return;
         }
         case Type::ARR_FIXED:
         case Type::ARR: {
             sections.PushSection(
                 {indent + maybe_key + "[", Description("json array")});
             for (const auto &i : m_inner) {
                 i.ToSections(sections, OuterType::ARR, current_indent + 2);
             }
             if (m_type == Type::ARR) {
                 sections.PushSection({indent_next + "...", ""});
+            } else {
+                CHECK_NONFATAL(!m_inner.empty());
+                // Remove final comma, which would be invalid JSON
+                sections.m_sections.back().m_left.pop_back();
             }
             sections.PushSection({indent + "]" + maybe_separator, ""});
             return;
         }
         case Type::OBJ_DYN:
         case Type::OBJ: {
             sections.PushSection(
                 {indent + maybe_key + "{", Description("json object")});
             for (const auto &i : m_inner) {
                 i.ToSections(sections, OuterType::OBJ, current_indent + 2);
             }
             if (m_type == Type::OBJ_DYN) {
                 // If the dictionary keys are dynamic, use three dots for
                 // continuation
                 sections.PushSection({indent_next + "...", ""});
+            } else {
+                CHECK_NONFATAL(!m_inner.empty());
+                // Remove final comma, which would be invalid JSON
+                sections.m_sections.back().m_left.pop_back();
             }
             sections.PushSection({indent + "}" + maybe_separator, ""});
             return;
         }
 
             // no default case, so the compiler can warn about missing cases
     }
 
     CHECK_NONFATAL(false);
 }
 
 std::string RPCArg::ToStringObj(const bool oneline) const {
     std::string res;
     res += "\"";
     res += GetFirstName();
     if (oneline) {
         res += "\":";
     } else {
         res += "\": ";
     }
     switch (m_type) {
         case Type::STR:
             return res + "\"str\"";
         case Type::STR_HEX:
             return res + "\"hex\"";
         case Type::NUM:
             return res + "n";
         case Type::RANGE:
             return res + "n or [n,n]";
         case Type::AMOUNT:
             return res + "amount";
         case Type::BOOL:
             return res + "bool";
         case Type::ARR:
             res += "[";
             for (const auto &i : m_inner) {
                 res += i.ToString(oneline) + ",";
             }
             return res + "...]";
         case Type::OBJ:
         case Type::OBJ_USER_KEYS:
             // Currently unused, so avoid writing dead code
             CHECK_NONFATAL(false);
 
             // no default case, so the compiler can warn about missing cases
     }
     CHECK_NONFATAL(false);
 }
 
 std::string RPCArg::ToString(const bool oneline) const {
     if (oneline && !m_oneline_description.empty()) {
         return m_oneline_description;
     }
 
     switch (m_type) {
         case Type::STR_HEX:
         case Type::STR: {
             return "\"" + GetFirstName() + "\"";
         }
         case Type::NUM:
         case Type::RANGE:
         case Type::AMOUNT:
         case Type::BOOL: {
             return GetFirstName();
         }
         case Type::OBJ:
         case Type::OBJ_USER_KEYS: {
             const std::string res = Join(m_inner, ",", [&](const RPCArg &i) {
                 return i.ToStringObj(oneline);
             });
             if (m_type == Type::OBJ) {
                 return "{" + res + "}";
             } else {
                 return "{" + res + ",...}";
             }
         }
         case Type::ARR: {
             std::string res;
             for (const auto &i : m_inner) {
                 res += i.ToString(oneline) + ",";
             }
             return "[" + res + "...]";
         }
 
             // no default case, so the compiler can warn about missing cases
     }
     CHECK_NONFATAL(false);
 }
 
 static std::pair<int64_t, int64_t> ParseRange(const UniValue &value) {
     if (value.isNum()) {
         return {0, value.get_int64()};
     }
     if (value.isArray() && value.size() == 2 && value[0].isNum() &&
         value[1].isNum()) {
         int64_t low = value[0].get_int64();
         int64_t high = value[1].get_int64();
         if (low > high) {
             throw JSONRPCError(
                 RPC_INVALID_PARAMETER,
                 "Range specified as [begin,end] must not have begin after end");
         }
         return {low, high};
     }
     throw JSONRPCError(RPC_INVALID_PARAMETER,
                        "Range must be specified as end or as [begin,end]");
 }
 
 std::pair<int64_t, int64_t> ParseDescriptorRange(const UniValue &value) {
     int64_t low, high;
     std::tie(low, high) = ParseRange(value);
     if (low < 0) {
         throw JSONRPCError(RPC_INVALID_PARAMETER,
                            "Range should be greater or equal than 0");
     }
     if ((high >> 31) != 0) {
         throw JSONRPCError(RPC_INVALID_PARAMETER, "End of range is too high");
     }
     if (high >= low + 1000000) {
         throw JSONRPCError(RPC_INVALID_PARAMETER, "Range is too large");
     }
     return {low, high};
 }
 
 std::vector<CScript>
 EvalDescriptorStringOrObject(const UniValue &scanobject,
                              FlatSigningProvider &provider) {
     std::string desc_str;
     std::pair<int64_t, int64_t> range = {0, 1000};
     if (scanobject.isStr()) {
         desc_str = scanobject.get_str();
     } else if (scanobject.isObject()) {
         UniValue desc_uni = find_value(scanobject, "desc");
         if (desc_uni.isNull()) {
             throw JSONRPCError(
                 RPC_INVALID_PARAMETER,
                 "Descriptor needs to be provided in scan object");
         }
         desc_str = desc_uni.get_str();
         UniValue range_uni = find_value(scanobject, "range");
         if (!range_uni.isNull()) {
             range = ParseDescriptorRange(range_uni);
         }
     } else {
         throw JSONRPCError(
             RPC_INVALID_PARAMETER,
             "Scan object needs to be either a string or an object");
     }
 
     std::string error;
     auto desc = Parse(desc_str, provider, error);
     if (!desc) {
         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, error);
     }
     if (!desc->IsRange()) {
         range.first = 0;
         range.second = 0;
     }
     std::vector<CScript> ret;
     for (int i = range.first; i <= range.second; ++i) {
         std::vector<CScript> scripts;
         if (!desc->Expand(i, provider, scripts, provider)) {
             throw JSONRPCError(
                 RPC_INVALID_ADDRESS_OR_KEY,
                 strprintf("Cannot derive script without private keys: '%s'",
                           desc_str));
         }
         std::move(scripts.begin(), scripts.end(), std::back_inserter(ret));
     }
     return ret;
 }
 
 UniValue GetServicesNames(ServiceFlags services) {
     UniValue servicesNames(UniValue::VARR);
 
     for (const auto &flag : serviceFlagsToStr(services)) {
         servicesNames.push_back(flag);
     }
 
     return servicesNames;
 }