diff --git a/src/rpc/util.cpp b/src/rpc/util.cpp
index 37ea99e40..7668850cf 100644
--- a/src/rpc/util.cpp
+++ b/src/rpc/util.cpp
@@ -1,685 +1,703 @@
 // 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 <pubkey.h>
 #include <script/signingprovider.h>
 #include <tinyformat.h>
 #include <util/strencodings.h>
 #include <util/string.h>
 
 #include <univalue.h>
 
 #include <boost/variant/static_visitor.hpp>
 
 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,
                      FillableSigningProvider *const 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));
     }
 }
 
 /**
  * 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;
     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);
     }
 
     /**
      * Serializing RPCArgs depends on the outer type. Only arrays and
      * dictionaries can be nested in json. The top-level outer type is "named
      * arguments", a mix between a dictionary and arrays.
      */
     enum class OuterType {
         ARR,
         OBJ,
         // Only set on first recursion
         NAMED_ARG,
     };
 
     /**
      * Recursive helper to translate an RPCArg into sections
      */
     void Push(const RPCArg &arg, const size_t current_indent = 5,
               const OuterType outer_type = OuterType::NAMED_ARG) {
         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::BOOL: {
                 // Nothing more to do for non-recursive types on first recursion
                 if (outer_type == OuterType::NAMED_ARG) {
                     return;
                 }
                 auto left = indent;
                 if (arg.m_type_str.size() != 0 && push_name) {
                     left += "\"" + arg.m_name + "\": " + 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::NAMED_ARG
                                        ? ""
                                        : arg.ToDescriptionString();
                 PushSection({indent +
                                  (push_name ? "\"" + arg.m_name + "\": " : "") +
                                  "{",
                              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::NAMED_ARG ? "," : ""),
                      ""});
                 break;
             }
             case RPCArg::Type::ARR: {
                 auto left = indent;
                 left += push_name ? "\"" + arg.m_name + "\": " : "";
                 left += "[";
                 const auto right = outer_type == OuterType::NAMED_ARG
                                        ? ""
                                        : 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::NAMED_ARG ? "," : ""),
                      ""});
                 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) {
         // Should have unique named arguments
         CHECK_NONFATAL(named_args.insert(arg.m_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";
         }
         result += r.m_result;
     }
     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";
 
     // 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(std::to_string(i + 1) + ". " +
                                              arg.m_name,
                                          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;
 }
 
 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::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;
 }
 
 std::string RPCArg::ToStringObj(const bool oneline) const {
     std::string res;
     res += "\"";
     res += m_name;
     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::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
             assert(false);
 
             // no default case, so the compiler can warn about missing cases
     }
     assert(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 "\"" + m_name + "\"";
         }
         case Type::NUM:
         case Type::AMOUNT:
         case Type::BOOL: {
             return m_name;
         }
         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
     }
     assert(false);
 }
+
+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]");
+}
diff --git a/src/rpc/util.h b/src/rpc/util.h
index 1f5cfc594..7d4323ec6 100644
--- a/src/rpc/util.h
+++ b/src/rpc/util.h
@@ -1,252 +1,255 @@
 // 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.
 
 #ifndef BITCOIN_RPC_UTIL_H
 #define BITCOIN_RPC_UTIL_H
 
 #include <node/transaction.h>
 #include <outputtype.h>
 #include <rpc/protocol.h>
 #include <rpc/request.h>
 #include <script/standard.h> // For CTxDestination
 #include <univalue.h>
 #include <util/check.h>
 
 #include <boost/variant.hpp>
 
 #include <string>
 #include <vector>
 
 class CChainParams;
 class FillableSigningProvider;
 class CPubKey;
 class CScript;
 class UniValue;
 
 /**
  * Wrapper for UniValue::VType, which includes typeAny: used to denote don't
  * care type.
  */
 struct UniValueType {
     UniValueType(UniValue::VType _type) : typeAny(false), type(_type) {}
     UniValueType() : typeAny(true) {}
     bool typeAny;
     UniValue::VType type;
 };
 
 /**
  * Type-check arguments; throws JSONRPCError if wrong type given. Does not check
  * that the right number of arguments are passed, just that any passed are the
  * correct type.
  */
 void RPCTypeCheck(const UniValue &params,
                   const std::list<UniValueType> &typesExpected,
                   bool fAllowNull = false);
 
 /**
  * Type-check one argument; throws JSONRPCError if wrong type given.
  */
 void RPCTypeCheckArgument(const UniValue &value,
                           const UniValueType &typeExpected);
 
 /**
  * Check for expected keys/value types in an Object.
  */
 void RPCTypeCheckObj(const UniValue &o,
                      const std::map<std::string, UniValueType> &typesExpected,
                      bool fAllowNull = false, bool fStrict = false);
 
 /**
  * Utilities: convert hex-encoded values (throws error if not hex).
  */
 extern uint256 ParseHashV(const UniValue &v, std::string strName);
 extern uint256 ParseHashO(const UniValue &o, std::string strKey);
 extern std::vector<uint8_t> ParseHexV(const UniValue &v, std::string strName);
 extern std::vector<uint8_t> ParseHexO(const UniValue &o, std::string strKey);
 
 extern Amount AmountFromValue(const UniValue &value);
 extern std::string HelpExampleCli(const std::string &methodname,
                                   const std::string &args);
 extern std::string HelpExampleRpc(const std::string &methodname,
                                   const std::string &args);
 
 CPubKey HexToPubKey(const std::string &hex_in);
 CPubKey AddrToPubKey(const CChainParams &chainparams,
                      FillableSigningProvider *const keystore,
                      const std::string &addr_in);
 CTxDestination AddAndGetMultisigDestination(const int required,
                                             const std::vector<CPubKey> &pubkeys,
                                             OutputType type,
                                             FillableSigningProvider &keystore,
                                             CScript &script_out);
 
 UniValue DescribeAddress(const CTxDestination &dest);
 
 RPCErrorCode RPCErrorFromTransactionError(TransactionError terr);
 UniValue JSONRPCTransactionError(TransactionError terr,
                                  const std::string &err_string = "");
 
+//! Parse a JSON range specified as int64, or [int64, int64]
+std::pair<int64_t, int64_t> ParseRange(const UniValue &value);
+
 struct RPCArg {
     enum class Type {
         OBJ,
         ARR,
         STR,
         NUM,
         BOOL,
         //! Special type where the user must set the keys e.g. to define
         //! multiple addresses; as opposed to e.g. an options object where the
         //! keys are predefined
         OBJ_USER_KEYS,
         //! Special type representing a floating point amount (can be either NUM
         //! or STR)
         AMOUNT,
         //! Special type that is a STR with only hex chars
         STR_HEX,
     };
 
     enum class Optional {
         /** Required arg */
         NO,
         /**
          * Optional arg that is a named argument and has a default value of
          * `null`. When possible, the default value should be specified.
          */
         OMITTED_NAMED_ARG,
         /**
          * Optional argument with default value omitted because they are
          * implicitly clear. That is, elements in an array or object may not
          * exist by default.
          * When possible, the default value should be specified.
          */
         OMITTED,
     };
     using Fallback =
         boost::variant<Optional,
                        /* default value for optional args */ std::string>;
 
     //! The name of the arg (can be empty for inner args)
     const std::string m_name;
     const Type m_type;
     //! Only used for arrays or dicts
     const std::vector<RPCArg> m_inner;
     const Fallback m_fallback;
     const std::string m_description;
     //! Should be empty unless it is supposed to override the auto-generated
     //! summary line
     const std::string m_oneline_description;
 
     //! Should be empty unless it is supposed to override the
     //! auto-generated type strings. Vector length is either 0
     //! or 2, m_type_str.at(0) will override the type of the
     //! value in a key-value pair, m_type_str.at(1) will
     //! override the type in the argument description.
     const std::vector<std::string> m_type_str;
 
     RPCArg(const std::string &name, const Type &type, const Fallback &fallback,
            const std::string &description,
            const std::string &oneline_description = "",
            const std::vector<std::string> &type_str = {})
         : m_name{name}, m_type{type}, m_fallback{fallback},
           m_description{description},
           m_oneline_description{oneline_description}, m_type_str{type_str} {
         CHECK_NONFATAL(type != Type::ARR && type != Type::OBJ);
     }
 
     RPCArg(const std::string &name, const Type &type, const Fallback &fallback,
            const std::string &description, const std::vector<RPCArg> &inner,
            const std::string &oneline_description = "",
            const std::vector<std::string> &type_str = {})
         : m_name{name}, m_type{type}, m_inner{inner}, m_fallback{fallback},
           m_description{description},
           m_oneline_description{oneline_description}, m_type_str{type_str} {
         CHECK_NONFATAL(type == Type::ARR || type == Type::OBJ);
     }
 
     bool IsOptional() const;
 
     /**
      * Return the type string of the argument.
      * Set oneline to allow it to be overridden by a custom oneline type string
      * (m_oneline_description).
      */
     std::string ToString(bool oneline) const;
     /**
      * Return the type string of the argument when it is in an object (dict).
      * Set oneline to get the oneline representation (less whitespace)
      */
     std::string ToStringObj(bool oneline) const;
     /**
      * Return the description string, including the argument type and whether
      * the argument is required.
      */
     std::string ToDescriptionString() const;
 };
 
 struct RPCResult {
     const std::string m_cond;
     const std::string m_result;
 
     explicit RPCResult(std::string result)
         : m_cond{}, m_result{std::move(result)} {
         CHECK_NONFATAL(!m_result.empty());
     }
 
     RPCResult(std::string cond, std::string result)
         : m_cond{std::move(cond)}, m_result{std::move(result)} {
         CHECK_NONFATAL(!m_cond.empty());
         CHECK_NONFATAL(!m_result.empty());
     }
 };
 
 struct RPCResults {
     const std::vector<RPCResult> m_results;
 
     RPCResults() : m_results{} {}
 
     RPCResults(RPCResult result) : m_results{{result}} {}
 
     RPCResults(std::initializer_list<RPCResult> results) : m_results{results} {}
 
     /**
      * Return the description string.
      */
     std::string ToDescriptionString() const;
 };
 
 struct RPCExamples {
     const std::string m_examples;
     explicit RPCExamples(std::string examples)
         : m_examples(std::move(examples)) {}
     RPCExamples() : m_examples(std::move("")) {}
     std::string ToDescriptionString() const;
 };
 
 class RPCHelpMan {
 public:
     RPCHelpMan(std::string name, std::string description,
                std::vector<RPCArg> args, RPCResults results,
                RPCExamples examples);
 
     std::string ToString() const;
     /** If the supplied number of args is neither too small nor too high */
     bool IsValidNumArgs(size_t num_args) const;
     /**
      * Check if the given request is valid according to this command or if
      * the user is asking for help information, and throw help when appropriate.
      */
     inline void Check(const JSONRPCRequest &request) const {
         if (request.fHelp || !IsValidNumArgs(request.params.size())) {
             throw std::runtime_error(ToString());
         }
     }
 
 private:
     const std::string m_name;
     const std::string m_description;
     const std::vector<RPCArg> m_args;
     const RPCResults m_results;
     const RPCExamples m_examples;
 };
 
 #endif // BITCOIN_RPC_UTIL_H