diff --git a/doc/release-notes.md b/doc/release-notes.md
index a892c52af..162c1f71b 100644
--- a/doc/release-notes.md
+++ b/doc/release-notes.md
@@ -1,60 +1,65 @@
 Bitcoin ABC version 0.21.8 is now available from:
 
   <https://download.bitcoinabc.org/0.21.8/>
 
 This release includes the following features and fixes:
 
 Updated RPCs
 ------------
 
 - The `getrawtransaction` RPC no longer checks the unspent UTXO set for
   a transaction. The remaining behaviors are as follows: 1. If a
   blockhash is provided, check the corresponding block. 2. If no
   blockhash is provided, check the mempool. 3. If no blockhash is
   provided but txindex is enabled, also check txindex.
 - `getaddressinfo` now reports `solvable`, a boolean indicating whether
   all information necessary for signing is present in the wallet
   (ignoring private keys).
 - `getaddressinfo`, `listunspent`, and `scantxoutset` have a new output
   field `desc`, an output descriptor that encapsulates all signing information
   and key paths for the address (only available when `solvable` is true for
   `getaddressinfo` and `listunspent`).
 - The `importmulti` RPC will now contain a new per-request `warnings`
   field with strings that explain when fields are being ignored or
   inconsistent, if any.
 
 RPC importprivkey: new label behavior
 -------------------------------------
 
 Previously, `importprivkey` automatically added the default empty label
 ("") to all addresses associated with the imported private key.  Now it
 defaults to using any existing label for those addresses.  For example:
 
 - Old behavior: you import a watch-only address with the label "cold
   wallet".  Later, you import the corresponding private key using the
   default settings.  The address's label is changed from "cold wallet"
   to "".
 
 - New behavior: you import a watch-only address with the label "cold
   wallet".  Later, you import the corresponding private key using the
   default settings.  The address's label remains "cold wallet".
 
 In both the previous and current case, if you directly specify a label
 during the import, that label will override whatever previous label the
 addresses may have had.  Also in both cases, if none of the addresses
 previously had a label, they will still receive the default empty label
 ("").  Examples:
 
 - You import a watch-only address with the label "temporary".  Later you
   import the corresponding private key with the label "final".  The
   address's label will be changed to "final".
 
 - You use the default settings to import a private key for an address that
   was not previously in the wallet.  Its addresses will receive the default
   empty label ("").
 
 Descriptor import support
 ---------------------
 
 The `importmulti` RPC now supports importing of addresses from descriptors. A "desc" parameter can be provided instead of the "scriptPubKey" in a request, as well as an optional range for ranged descriptors to specify the start and end of the range to import. More information about
 descriptors can be found [here](https://github.com/Bitcoin-ABC/bitcoin-abc/blob/master/doc/descriptors.md).
+
+New RPC methods
+------------
+
+- `deriveaddresses` returns one or more addresses corresponding to an [output descriptor](/doc/descriptors.md).
\ No newline at end of file
diff --git a/src/rpc/client.cpp b/src/rpc/client.cpp
index 8b3c52960..15049c083 100644
--- a/src/rpc/client.cpp
+++ b/src/rpc/client.cpp
@@ -1,247 +1,249 @@
 // Copyright (c) 2010 Satoshi Nakamoto
 // Copyright (c) 2009-2016 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/client.h>
 #include <rpc/protocol.h>
 #include <util/system.h>
 
 #include <cstdint>
 #include <set>
 
 #include <univalue.h>
 
 class CRPCConvertParam {
 public:
     std::string methodName; //!< method whose params want conversion
     int paramIdx;           //!< 0-based idx of param to convert
     std::string paramName;  //!< parameter name
 };
 
 /**
  * Specify a (method, idx, name) here if the argument is a non-string RPC
  * argument and needs to be converted from JSON.
  *
  * @note Parameter indexes start from 0.
  */
 static const CRPCConvertParam vRPCConvertParams[] = {
     {"setmocktime", 0, "timestamp"},
     {"generate", 0, "nblocks"},
     {"generate", 1, "maxtries"},
     {"generatetoaddress", 0, "nblocks"},
     {"generatetoaddress", 2, "maxtries"},
     {"getnetworkhashps", 0, "nblocks"},
     {"getnetworkhashps", 1, "height"},
     {"sendtoaddress", 1, "amount"},
     {"sendtoaddress", 4, "subtractfeefromamount"},
     {"settxfee", 0, "amount"},
     {"sethdseed", 0, "newkeypool"},
     {"getreceivedbyaddress", 1, "minconf"},
     {"getreceivedbylabel", 1, "minconf"},
     {"listreceivedbyaddress", 0, "minconf"},
     {"listreceivedbyaddress", 1, "include_empty"},
     {"listreceivedbyaddress", 2, "include_watchonly"},
     {"listreceivedbyaddress", 3, "address_filter"},
     {"listreceivedbylabel", 0, "minconf"},
     {"listreceivedbylabel", 1, "include_empty"},
     {"listreceivedbylabel", 2, "include_watchonly"},
     {"getbalance", 1, "minconf"},
     {"getbalance", 2, "include_watchonly"},
     {"getblockhash", 0, "height"},
     {"waitforblockheight", 0, "height"},
     {"waitforblockheight", 1, "timeout"},
     {"waitforblock", 1, "timeout"},
     {"waitfornewblock", 0, "timeout"},
     {"listtransactions", 1, "count"},
     {"listtransactions", 2, "skip"},
     {"listtransactions", 3, "include_watchonly"},
     {"walletpassphrase", 1, "timeout"},
     {"getblocktemplate", 0, "template_request"},
     {"listsinceblock", 1, "target_confirmations"},
     {"listsinceblock", 2, "include_watchonly"},
     {"listsinceblock", 3, "include_removed"},
     {"sendmany", 1, "amounts"},
     {"sendmany", 2, "minconf"},
     {"sendmany", 4, "subtractfeefrom"},
+    {"deriveaddresses", 1, "begin"},
+    {"deriveaddresses", 2, "end"},
     {"scantxoutset", 1, "scanobjects"},
     {"addmultisigaddress", 0, "nrequired"},
     {"addmultisigaddress", 1, "keys"},
     {"createmultisig", 0, "nrequired"},
     {"createmultisig", 1, "keys"},
     {"listunspent", 0, "minconf"},
     {"listunspent", 1, "maxconf"},
     {"listunspent", 2, "addresses"},
     {"listunspent", 3, "include_unsafe"},
     {"listunspent", 4, "query_options"},
     {"getblock", 1, "verbosity"},
     {"getblock", 1, "verbose"},
     {"getblockheader", 1, "verbose"},
     {"getchaintxstats", 0, "nblocks"},
     {"gettransaction", 1, "include_watchonly"},
     {"getrawtransaction", 1, "verbose"},
     {"createrawtransaction", 0, "inputs"},
     {"createrawtransaction", 1, "outputs"},
     {"createrawtransaction", 2, "locktime"},
     {"signrawtransactionwithkey", 1, "privkeys"},
     {"signrawtransactionwithkey", 2, "prevtxs"},
     {"signrawtransactionwithwallet", 1, "prevtxs"},
     {"sendrawtransaction", 1, "allowhighfees"},
     {"testmempoolaccept", 0, "rawtxs"},
     {"testmempoolaccept", 1, "allowhighfees"},
     {"combinerawtransaction", 0, "txs"},
     {"fundrawtransaction", 1, "options"},
     {"walletcreatefundedpsbt", 0, "inputs"},
     {"walletcreatefundedpsbt", 1, "outputs"},
     {"walletcreatefundedpsbt", 2, "locktime"},
     {"walletcreatefundedpsbt", 3, "options"},
     {"walletcreatefundedpsbt", 4, "bip32derivs"},
     {"walletprocesspsbt", 1, "sign"},
     {"walletprocesspsbt", 3, "bip32derivs"},
     {"createpsbt", 0, "inputs"},
     {"createpsbt", 1, "outputs"},
     {"createpsbt", 2, "locktime"},
     {"combinepsbt", 0, "txs"},
     {"joinpsbts", 0, "txs"},
     {"finalizepsbt", 1, "extract"},
     {"converttopsbt", 1, "permitsigdata"},
     {"gettxout", 1, "n"},
     {"gettxout", 2, "include_mempool"},
     {"gettxoutproof", 0, "txids"},
     {"lockunspent", 0, "unlock"},
     {"lockunspent", 1, "transactions"},
     {"importprivkey", 2, "rescan"},
     {"importaddress", 2, "rescan"},
     {"importaddress", 3, "p2sh"},
     {"importpubkey", 2, "rescan"},
     {"importmulti", 0, "requests"},
     {"importmulti", 1, "options"},
     {"verifychain", 0, "checklevel"},
     {"verifychain", 1, "nblocks"},
     {"getblockstats", 0, "hash_or_height"},
     {"getblockstats", 1, "stats"},
     {"pruneblockchain", 0, "height"},
     {"keypoolrefill", 0, "newsize"},
     {"getrawmempool", 0, "verbose"},
     {"estimatefee", 0, "nblocks"},
     {"prioritisetransaction", 1, "dummy"},
     {"prioritisetransaction", 2, "fee_delta"},
     {"setban", 2, "bantime"},
     {"setban", 3, "absolute"},
     {"setnetworkactive", 0, "state"},
     {"getmempoolancestors", 1, "verbose"},
     {"getmempooldescendants", 1, "verbose"},
     {"disconnectnode", 1, "nodeid"},
     {"logging", 0, "include"},
     {"logging", 1, "exclude"},
     // Echo with conversion (For testing only)
     {"echojson", 0, "arg0"},
     {"echojson", 1, "arg1"},
     {"echojson", 2, "arg2"},
     {"echojson", 3, "arg3"},
     {"echojson", 4, "arg4"},
     {"echojson", 5, "arg5"},
     {"echojson", 6, "arg6"},
     {"echojson", 7, "arg7"},
     {"echojson", 8, "arg8"},
     {"echojson", 9, "arg9"},
     {"rescanblockchain", 0, "start_height"},
     {"rescanblockchain", 1, "stop_height"},
     {"createwallet", 1, "disable_private_keys"},
     {"createwallet", 2, "blank"},
     {"getnodeaddresses", 0, "count"},
     {"stop", 0, "wait"},
     // Avalanche
     {"addavalanchepeer", 0, "nodeid"},
     // ABC specific RPC
     {"setexcessiveblock", 0, "blockSize"},
 };
 
 class CRPCConvertTable {
 private:
     std::set<std::pair<std::string, int>> members;
     std::set<std::pair<std::string, std::string>> membersByName;
 
 public:
     CRPCConvertTable();
 
     bool convert(const std::string &method, int idx) {
         return (members.count(std::make_pair(method, idx)) > 0);
     }
     bool convert(const std::string &method, const std::string &name) {
         return (membersByName.count(std::make_pair(method, name)) > 0);
     }
 };
 
 CRPCConvertTable::CRPCConvertTable() {
     const unsigned int n_elem =
         (sizeof(vRPCConvertParams) / sizeof(vRPCConvertParams[0]));
 
     for (unsigned int i = 0; i < n_elem; i++) {
         members.insert(std::make_pair(vRPCConvertParams[i].methodName,
                                       vRPCConvertParams[i].paramIdx));
         membersByName.insert(std::make_pair(vRPCConvertParams[i].methodName,
                                             vRPCConvertParams[i].paramName));
     }
 }
 
 static CRPCConvertTable rpcCvtTable;
 
 /**
  * Non-RFC4627 JSON parser, accepts internal values (such as numbers, true,
  * false, null) as well as objects and arrays.
  */
 UniValue ParseNonRFCJSONValue(const std::string &strVal) {
     UniValue jVal;
     if (!jVal.read(std::string("[") + strVal + std::string("]")) ||
         !jVal.isArray() || jVal.size() != 1) {
         throw std::runtime_error(std::string("Error parsing JSON:") + strVal);
     }
     return jVal[0];
 }
 
 UniValue RPCConvertValues(const std::string &strMethod,
                           const std::vector<std::string> &strParams) {
     UniValue params(UniValue::VARR);
 
     for (unsigned int idx = 0; idx < strParams.size(); idx++) {
         const std::string &strVal = strParams[idx];
 
         if (!rpcCvtTable.convert(strMethod, idx)) {
             // insert string value directly
             params.push_back(strVal);
         } else {
             // parse string as JSON, insert bool/number/object/etc. value
             params.push_back(ParseNonRFCJSONValue(strVal));
         }
     }
 
     return params;
 }
 
 UniValue RPCConvertNamedValues(const std::string &strMethod,
                                const std::vector<std::string> &strParams) {
     UniValue params(UniValue::VOBJ);
 
     for (const std::string &s : strParams) {
         size_t pos = s.find('=');
         if (pos == std::string::npos) {
             throw(std::runtime_error("No '=' in named argument '" + s +
                                      "', this needs to be present for every "
                                      "argument (even if it is empty)"));
         }
 
         std::string name = s.substr(0, pos);
         std::string value = s.substr(pos + 1);
 
         if (!rpcCvtTable.convert(strMethod, name)) {
             // insert string value directly
             params.pushKV(name, value);
         } else {
             // parse string as JSON, insert bool/number/object/etc. value
             params.pushKV(name, ParseNonRFCJSONValue(value));
         }
     }
 
     return params;
 }
diff --git a/src/rpc/misc.cpp b/src/rpc/misc.cpp
index 3a23c044a..e13e2178a 100644
--- a/src/rpc/misc.cpp
+++ b/src/rpc/misc.cpp
@@ -1,599 +1,715 @@
 // Copyright (c) 2010 Satoshi Nakamoto
 // Copyright (c) 2009-2016 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 <chain.h>
 #include <clientversion.h>
 #include <config.h>
 #include <core_io.h>
 #include <httpserver.h>
 #include <key_io.h>
 #include <logging.h>
 #include <net.h>
 #include <netbase.h>
 #include <outputtype.h>
 #include <rpc/blockchain.h>
 #include <rpc/server.h>
 #include <rpc/util.h>
+#include <script/descriptor.h>
 #include <timedata.h>
 #include <util/check.h>
 #include <util/strencodings.h>
 #include <util/system.h>
 #include <util/validation.h>
 #include <validation.h>
 #include <warnings.h>
 
 #include <univalue.h>
 
 #include <cstdint>
 #ifdef HAVE_MALLOC_INFO
 #include <malloc.h>
 #endif
 
 static UniValue validateaddress(const Config &config,
                                 const JSONRPCRequest &request) {
     if (request.fHelp || request.params.size() != 1) {
         throw std::runtime_error(RPCHelpMan{
             "validateaddress",
             "\nReturn information about the given bitcoin address.\n",
             {
                 {"address", RPCArg::Type::STR, /* opt */ false,
                  /* default_val */ "", "The bitcoin address to validate"},
             },
             RPCResult{
                 "{\n"
                 "  \"isvalid\" : true|false,       (boolean) If the address is "
                 "valid or not. If not, this is the only property returned.\n"
                 "  \"address\" : \"address\",        (string) The bitcoin "
                 "address validated\n"
                 "  \"scriptPubKey\" : \"hex\",       (string) The hex-encoded "
                 "scriptPubKey generated by the address\n"
                 "  \"isscript\" : true|false,      (boolean) If the key is a "
                 "script\n"
                 "}\n"},
             RPCExamples{
                 HelpExampleCli("validateaddress",
                                "\"1PSSGeFHDnKNxiEyFrD1wcEaHr9hrQDDWc\"") +
                 HelpExampleRpc("validateaddress",
                                "\"1PSSGeFHDnKNxiEyFrD1wcEaHr9hrQDDWc\"")},
         }
                                      .ToString());
     }
 
     CTxDestination dest =
         DecodeDestination(request.params[0].get_str(), config.GetChainParams());
     bool isValid = IsValidDestination(dest);
 
     UniValue ret(UniValue::VOBJ);
     ret.pushKV("isvalid", isValid);
 
     if (isValid) {
         if (ret["address"].isNull()) {
             std::string currentAddress = EncodeDestination(dest, config);
             ret.pushKV("address", currentAddress);
 
             CScript scriptPubKey = GetScriptForDestination(dest);
             ret.pushKV("scriptPubKey",
                        HexStr(scriptPubKey.begin(), scriptPubKey.end()));
 
             UniValue detail = DescribeAddress(dest);
             ret.pushKVs(detail);
         }
     }
     return ret;
 }
 
 static UniValue createmultisig(const Config &config,
                                const JSONRPCRequest &request) {
     if (request.fHelp || request.params.size() < 2 ||
         request.params.size() > 2) {
         std::string msg =
             RPCHelpMan{
                 "createmultisig",
                 "\nCreates a multi-signature address with n signature of m "
                 "keys required.\n"
                 "It returns a json object with the address and redeemScript.\n",
                 {
                     {"nrequired", RPCArg::Type::NUM, /* opt */ false,
                      /* default_val */ "",
                      "The number of required signatures out of the n keys."},
                     {"keys",
                      RPCArg::Type::ARR,
                      /* opt */ false,
                      /* default_val */ "",
                      "A json array of hex-encoded public keys.",
                      {
                          {"key", RPCArg::Type::STR_HEX, /* opt */ false,
                           /* default_val */ "", "The hex-encoded public key"},
                      }},
                 },
                 RPCResult{"{\n"
                           "  \"address\":\"multisigaddress\",  (string) The "
                           "value of the new multisig address.\n"
                           "  \"redeemScript\":\"script\"       (string) The "
                           "string value of the hex-encoded redemption script.\n"
                           "}\n"},
                 RPCExamples{
                     "\nCreate a multisig address from 2 public keys\n" +
                     HelpExampleCli(
                         "createmultisig",
                         "2 "
                         "\"["
                         "\\\"03789ed0bb717d88f7d321a368d905e7430207ebbd82bd3"
                         "42cf11ae157a7ace5fd\\\","
                         "\\\"03dbc6764b8884a92e871274b87583e6d5c2a58819473e1"
                         "7e107ef3f6aa5a61626\\\"]\"") +
                     "\nAs a JSON-RPC call\n" +
                     HelpExampleRpc(
                         "createmultisig",
                         "2, "
                         "\"["
                         "\\\"03789ed0bb717d88f7d321a368d905e7430207ebbd82bd3"
                         "42cf11ae157a7ace5fd\\\","
                         "\\\"03dbc6764b8884a92e871274b87583e6d5c2a58819473e1"
                         "7e107ef3f6aa5a61626\\\"]\"")},
             }
                 .ToString();
         throw std::runtime_error(msg);
     }
 
     int required = request.params[0].get_int();
 
     // Get the public keys
     const UniValue &keys = request.params[1].get_array();
     std::vector<CPubKey> pubkeys;
     for (size_t i = 0; i < keys.size(); ++i) {
         if ((keys[i].get_str().length() ==
                  2 * CPubKey::COMPRESSED_PUBLIC_KEY_SIZE ||
              keys[i].get_str().length() == 2 * CPubKey::PUBLIC_KEY_SIZE) &&
             IsHex(keys[i].get_str())) {
             pubkeys.push_back(HexToPubKey(keys[i].get_str()));
         } else {
             throw JSONRPCError(
                 RPC_INVALID_ADDRESS_OR_KEY,
                 strprintf("Invalid public key: %s\n", keys[i].get_str()));
         }
     }
 
     // Get the output type
     OutputType output_type = OutputType::LEGACY;
 
     // Construct using pay-to-script-hash:
     const CScript inner = CreateMultisigRedeemscript(required, pubkeys);
     CBasicKeyStore keystore;
     const CTxDestination dest =
         AddAndGetDestinationForScript(keystore, inner, output_type);
 
     UniValue result(UniValue::VOBJ);
     result.pushKV("address", EncodeDestination(dest, config));
     result.pushKV("redeemScript", HexStr(inner.begin(), inner.end()));
 
     return result;
 }
 
+UniValue deriveaddresses(const Config &config, const JSONRPCRequest &request) {
+    if (request.fHelp || request.params.empty() || request.params.size() > 3) {
+        throw std::runtime_error(RPCHelpMan{
+            "deriveaddresses",
+            {"\nDerives one or more addresses corresponding to an output "
+             "descriptor.\n"
+             "Examples of output descriptors are:\n"
+             "    pkh(<pubkey>)                        P2PKH outputs for the "
+             "given pubkey\n"
+             "    sh(multi(<n>,<pubkey>,<pubkey>,...)) P2SH-multisig outputs "
+             "for the given threshold and pubkeys\n"
+             "    raw(<hex script>)                    Outputs whose "
+             "scriptPubKey equals the specified hex scripts\n"
+             "\nIn the above, <pubkey> either refers to a fixed public key in "
+             "hexadecimal notation, or to an xpub/xprv optionally followed by "
+             "one\n"
+             "or more path elements separated by \"/\", where \"h\" represents "
+             "a hardened child key.\n"
+             "For more information on output descriptors, see the "
+             "documentation in the doc/descriptors.md file.\n"},
+            {{"descriptor", RPCArg::Type::STR, /* opt */ false,
+              /* default_val */ "", "The descriptor."},
+             {"begin", RPCArg::Type::NUM, /* opt */ true, /* default_val */ "",
+              "If a ranged descriptor is used, this specifies the beginning of "
+              "the range to import."},
+             {"end", RPCArg::Type::NUM, /* opt */ true, /* default_val */ "",
+              "If a ranged descriptor is used, this specifies the end of the "
+              "range to import."}},
+            RPCResult{"[ address ] (array) the derived addresses\n"},
+            RPCExamples{
+                "First three native segwit receive addresses\n" +
+                HelpExampleCli(
+                    "deriveaddresses",
+                    "\"pkh([d34db33f/84h/0h/"
+                    "0h]"
+                    "xpub6DJ2dNUysrn5Vt36jH2KLBT2i1auw1tTSSomg8PhqNiUtx8QX2SvC9"
+                    "nrHu81fT41fvDUnhMjEzQgXnQjKEu3oaqMSzhSrHMxyyoEAmUHQbY/0/"
+                    "*)\" 0 2")}}.ToString());
+    }
+
+    RPCTypeCheck(request.params,
+                 {UniValue::VSTR, UniValue::VNUM, UniValue::VNUM});
+    const std::string desc_str = request.params[0].get_str();
+
+    int range_begin = 0;
+    int range_end = 0;
+
+    if (request.params.size() >= 2) {
+        if (request.params.size() == 2) {
+            throw JSONRPCError(RPC_INVALID_PARAMETER,
+                               "Missing range end parameter");
+        }
+        range_begin = request.params[1].get_int();
+        range_end = request.params[2].get_int();
+        if (range_begin < 0) {
+            throw JSONRPCError(RPC_INVALID_PARAMETER,
+                               "Range should be greater or equal than 0");
+        }
+        if (range_begin > range_end) {
+            throw JSONRPCError(
+                RPC_INVALID_PARAMETER,
+                "Range end should be equal to or greater than begin");
+        }
+    }
+
+    FlatSigningProvider provider;
+    auto desc = Parse(desc_str, provider);
+    if (!desc) {
+        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY,
+                           strprintf("Invalid descriptor"));
+    }
+
+    if (!desc->IsRange() && request.params.size() > 1) {
+        throw JSONRPCError(
+            RPC_INVALID_PARAMETER,
+            "Range should not be specified for an un-ranged descriptor");
+    }
+
+    if (desc->IsRange() && request.params.size() == 1) {
+        throw JSONRPCError(RPC_INVALID_PARAMETER,
+                           "Range must be specified for a ranged descriptor");
+    }
+
+    UniValue addresses(UniValue::VARR);
+
+    for (int i = range_begin; i <= range_end; ++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"));
+        }
+
+        for (const CScript &script : scripts) {
+            CTxDestination dest;
+            if (!ExtractDestination(script, dest)) {
+                throw JSONRPCError(
+                    RPC_INVALID_ADDRESS_OR_KEY,
+                    strprintf(
+                        "Descriptor does not have a corresponding address"));
+            }
+
+            addresses.push_back(EncodeDestination(dest, config));
+        }
+    }
+
+    // This should not be possible, but an assert seems overkill:
+    if (addresses.empty()) {
+        throw JSONRPCError(RPC_MISC_ERROR, "Unexpected empty result");
+    }
+
+    return addresses;
+}
+
 static UniValue verifymessage(const Config &config,
                               const JSONRPCRequest &request) {
     if (request.fHelp || request.params.size() != 3) {
         throw std::runtime_error(RPCHelpMan{
             "verifymessage",
             "\nVerify a signed message\n",
             {
                 {"address", RPCArg::Type::STR, /* opt */ false,
                  /* default_val */ "",
                  "The bitcoin address to use for the signature."},
                 {"signature", RPCArg::Type::STR, /* opt */ false,
                  /* default_val */ "",
                  "The signature provided by the signer in base 64 encoding "
                  "(see signmessage)."},
                 {"message", RPCArg::Type::STR, /* opt */ false,
                  /* default_val */ "", "The message that was signed."},
             },
             RPCResult{"true|false   (boolean) If the signature is verified or "
                       "not.\n"},
             RPCExamples{
                 "\nUnlock the wallet for 30 seconds\n" +
                 HelpExampleCli("walletpassphrase", "\"mypassphrase\" 30") +
                 "\nCreate the signature\n" +
                 HelpExampleCli(
                     "signmessage",
                     "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\" \"my message\"") +
                 "\nVerify the signature\n" +
                 HelpExampleCli("verifymessage",
                                "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4"
                                "XX\" \"signature\" \"my "
                                "message\"") +
                 "\nAs a JSON-RPC call\n" +
                 HelpExampleRpc("verifymessage",
                                "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4"
                                "XX\", \"signature\", \"my "
                                "message\"")},
         }
                                      .ToString());
     }
 
     LOCK(cs_main);
 
     std::string strAddress = request.params[0].get_str();
     std::string strSign = request.params[1].get_str();
     std::string strMessage = request.params[2].get_str();
 
     CTxDestination destination =
         DecodeDestination(strAddress, config.GetChainParams());
     if (!IsValidDestination(destination)) {
         throw JSONRPCError(RPC_TYPE_ERROR, "Invalid address");
     }
 
     const CKeyID *keyID = boost::get<CKeyID>(&destination);
     if (!keyID) {
         throw JSONRPCError(RPC_TYPE_ERROR, "Address does not refer to key");
     }
 
     bool fInvalid = false;
     std::vector<uint8_t> vchSig = DecodeBase64(strSign.c_str(), &fInvalid);
 
     if (fInvalid) {
         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY,
                            "Malformed base64 encoding");
     }
 
     CHashWriter ss(SER_GETHASH, 0);
     ss << strMessageMagic;
     ss << strMessage;
 
     CPubKey pubkey;
     if (!pubkey.RecoverCompact(ss.GetHash(), vchSig)) {
         return false;
     }
 
     return (pubkey.GetID() == *keyID);
 }
 
 static UniValue signmessagewithprivkey(const Config &config,
                                        const JSONRPCRequest &request) {
     if (request.fHelp || request.params.size() != 2) {
         throw std::runtime_error(RPCHelpMan{
             "signmessagewithprivkey",
             "\nSign a message with the private key of an address\n",
             {
                 {"privkey", RPCArg::Type::STR, /* opt */ false,
                  /* default_val */ "",
                  "The private key to sign the message with."},
                 {"message", RPCArg::Type::STR, /* opt */ false,
                  /* default_val */ "", "The message to create a signature of."},
             },
             RPCResult{"\"signature\"          (string) The signature of the "
                       "message encoded in base 64\n"},
             RPCExamples{"\nCreate the signature\n" +
                         HelpExampleCli("signmessagewithprivkey",
                                        "\"privkey\" \"my message\"") +
                         "\nVerify the signature\n" +
                         HelpExampleCli("verifymessage",
                                        "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4"
                                        "XX\" \"signature\" \"my "
                                        "message\"") +
                         "\nAs a JSON-RPC call\n" +
                         HelpExampleRpc("signmessagewithprivkey",
                                        "\"privkey\", \"my message\"")},
         }
                                      .ToString());
     }
 
     std::string strPrivkey = request.params[0].get_str();
     std::string strMessage = request.params[1].get_str();
 
     CKey key = DecodeSecret(strPrivkey);
     if (!key.IsValid()) {
         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid private key");
     }
 
     CHashWriter ss(SER_GETHASH, 0);
     ss << strMessageMagic;
     ss << strMessage;
 
     std::vector<uint8_t> vchSig;
     if (!key.SignCompact(ss.GetHash(), vchSig)) {
         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Sign failed");
     }
 
     return EncodeBase64(vchSig.data(), vchSig.size());
 }
 
 static UniValue setmocktime(const Config &config,
                             const JSONRPCRequest &request) {
     if (request.fHelp || request.params.size() != 1) {
         throw std::runtime_error(RPCHelpMan{
             "setmocktime",
             "\nSet the local time to given timestamp (-regtest only)\n",
             {
                 {"timestamp", RPCArg::Type::NUM, /* opt */ false,
                  /* default_val */ "",
                  "Unix seconds-since-epoch timestamp\n"
                  "   Pass 0 to go back to using the system time."},
             },
             RPCResults{},
             RPCExamples{""},
         }
                                      .ToString());
     }
 
     if (!config.GetChainParams().MineBlocksOnDemand()) {
         throw std::runtime_error(
             "setmocktime for regression testing (-regtest mode) only");
     }
 
     // For now, don't change mocktime if we're in the middle of validation, as
     // this could have an effect on mempool time-based eviction, as well as
     // IsInitialBlockDownload().
     // TODO: figure out the right way to synchronize around mocktime, and
     // ensure all call sites of GetTime() are accessing this safely.
     LOCK(cs_main);
 
     RPCTypeCheck(request.params, {UniValue::VNUM});
     int64_t mockTime = request.params[0].get_int64();
     if (mockTime < 0) {
         throw JSONRPCError(RPC_INVALID_PARAMETER,
                            "Timestamp must be 0 or greater");
     }
     SetMockTime(mockTime);
 
     return NullUniValue;
 }
 
 static UniValue RPCLockedMemoryInfo() {
     LockedPool::Stats stats = LockedPoolManager::Instance().stats();
     UniValue obj(UniValue::VOBJ);
     obj.pushKV("used", uint64_t(stats.used));
     obj.pushKV("free", uint64_t(stats.free));
     obj.pushKV("total", uint64_t(stats.total));
     obj.pushKV("locked", uint64_t(stats.locked));
     obj.pushKV("chunks_used", uint64_t(stats.chunks_used));
     obj.pushKV("chunks_free", uint64_t(stats.chunks_free));
     return obj;
 }
 
 #ifdef HAVE_MALLOC_INFO
 static std::string RPCMallocInfo() {
     char *ptr = nullptr;
     size_t size = 0;
     FILE *f = open_memstream(&ptr, &size);
     if (f) {
         malloc_info(0, f);
         fclose(f);
         if (ptr) {
             std::string rv(ptr, size);
             free(ptr);
             return rv;
         }
     }
     return "";
 }
 #endif
 
 static UniValue getmemoryinfo(const Config &config,
                               const JSONRPCRequest &request) {
     /* Please, avoid using the word "pool" here in the RPC interface or help,
      * as users will undoubtedly confuse it with the other "memory pool"
      */
     if (request.fHelp || request.params.size() > 1) {
         throw std::runtime_error(RPCHelpMan{
             "getmemoryinfo",
             "Returns an object containing information about memory usage.\n",
             {
                 {"mode", RPCArg::Type::STR, /* opt */ true,
                  /* default_val */ "",
                  "determines what kind of information is returned. This "
                  "argument is optional, the default mode is \"stats\".\n"
                  "  - \"stats\" returns general statistics about memory usage "
                  "in the daemon.\n"
                  "  - \"mallocinfo\" returns an XML string describing "
                  "low-level heap state (only available if compiled with glibc "
                  "2.10+)."},
             },
             {
                 RPCResult{"mode \"stats\"",
                           "{\n"
                           "  \"locked\": {               (json object) "
                           "Information about locked memory manager\n"
                           "    \"used\": xxxxx,          (numeric) Number of "
                           "bytes used\n"
                           "    \"free\": xxxxx,          (numeric) Number of "
                           "bytes available in current arenas\n"
                           "    \"total\": xxxxxxx,       (numeric) Total "
                           "number of bytes managed\n"
                           "    \"locked\": xxxxxx,       (numeric) Amount of "
                           "bytes that succeeded locking. If this number is "
                           "smaller than total, locking pages failed at some "
                           "point and key data could be swapped to disk.\n"
                           "    \"chunks_used\": xxxxx,   (numeric) Number "
                           "allocated chunks\n"
                           "    \"chunks_free\": xxxxx,   (numeric) Number "
                           "unused chunks\n"
                           "  }\n"
                           "}\n"},
                 RPCResult{"mode \"mallocinfo\"",
                           "\"<malloc version=\"1\">...\"\n"},
             },
             RPCExamples{HelpExampleCli("getmemoryinfo", "") +
                         HelpExampleRpc("getmemoryinfo", "")},
         }
                                      .ToString());
     }
 
     std::string mode =
         request.params[0].isNull() ? "stats" : request.params[0].get_str();
     if (mode == "stats") {
         UniValue obj(UniValue::VOBJ);
         obj.pushKV("locked", RPCLockedMemoryInfo());
         return obj;
     } else if (mode == "mallocinfo") {
 #ifdef HAVE_MALLOC_INFO
         return RPCMallocInfo();
 #else
         throw JSONRPCError(
             RPC_INVALID_PARAMETER,
             "mallocinfo is only available when compiled with glibc 2.10+");
 #endif
     } else {
         throw JSONRPCError(RPC_INVALID_PARAMETER, "unknown mode " + mode);
     }
 }
 
 static void EnableOrDisableLogCategories(UniValue cats, bool enable) {
     cats = cats.get_array();
     for (size_t i = 0; i < cats.size(); ++i) {
         std::string cat = cats[i].get_str();
 
         bool success;
         if (enable) {
             success = LogInstance().EnableCategory(cat);
         } else {
             success = LogInstance().DisableCategory(cat);
         }
 
         if (!success) {
             throw JSONRPCError(RPC_INVALID_PARAMETER,
                                "unknown logging category " + cat);
         }
     }
 }
 
 static UniValue logging(const Config &config, const JSONRPCRequest &request) {
     if (request.fHelp || request.params.size() > 2) {
         throw std::runtime_error(RPCHelpMan{
             "logging",
             "Gets and sets the logging configuration.\n"
             "When called without an argument, returns the list of categories "
             "with status that are currently being debug logged or not.\n"
             "When called with arguments, adds or removes categories from debug "
             "logging and return the lists above.\n"
             "The arguments are evaluated in order \"include\", \"exclude\".\n"
             "If an item is both included and excluded, it will thus end up "
             "being excluded.\n"
             "The valid logging categories are: " +
                 ListLogCategories() +
                 "\n"
                 "In addition, the following are available as category names "
                 "with special meanings:\n"
                 "  - \"all\",  \"1\" : represent all logging categories.\n"
                 "  - \"none\", \"0\" : even if other logging categories are "
                 "specified, ignore all of them.\n",
             {
                 {"include",
                  RPCArg::Type::ARR,
                  /* opt */ true,
                  /* default_val */ "",
                  "A json array of categories to add debug logging",
                  {
                      {"include_category", RPCArg::Type::STR,
                       /* opt */ false, /* default_val */ "",
                       "the valid logging category"},
                  }},
                 {"exclude",
                  RPCArg::Type::ARR,
                  /* opt */ true,
                  /* default_val */ "",
                  "A json array of categories to remove debug logging",
                  {
                      {"exclude_category", RPCArg::Type::STR,
                       /* opt */ false, /* default_val */ "",
                       "the valid logging category"},
                  }},
             },
             RPCResult{"{                   (json object where keys are the "
                       "logging categories, and values indicates its status\n"
                       "  \"category\": 0|1,  (numeric) if being debug logged "
                       "or not. 0:inactive, 1:active\n"
                       "  ...\n"
                       "}\n"},
             RPCExamples{HelpExampleCli("logging",
                                        "\"[\\\"all\\\"]\" \"[\\\"http\\\"]\"") +
                         HelpExampleRpc("logging", "[\"all\"], \"[libevent]\"")},
         }
                                      .ToString());
     }
 
     uint32_t original_log_categories = LogInstance().GetCategoryMask();
     if (request.params[0].isArray()) {
         EnableOrDisableLogCategories(request.params[0], true);
     }
 
     if (request.params[1].isArray()) {
         EnableOrDisableLogCategories(request.params[1], false);
     }
 
     uint32_t updated_log_categories = LogInstance().GetCategoryMask();
     uint32_t changed_log_categories =
         original_log_categories ^ updated_log_categories;
 
     /**
      * Update libevent logging if BCLog::LIBEVENT has changed.
      * If the library version doesn't allow it, UpdateHTTPServerLogging()
      * returns false, in which case we should clear the BCLog::LIBEVENT flag.
      * Throw an error if the user has explicitly asked to change only the
      * libevent flag and it failed.
      */
     if (changed_log_categories & BCLog::LIBEVENT) {
         if (!UpdateHTTPServerLogging(
                 LogInstance().WillLogCategory(BCLog::LIBEVENT))) {
             LogInstance().DisableCategory(BCLog::LIBEVENT);
             if (changed_log_categories == BCLog::LIBEVENT) {
                 throw JSONRPCError(RPC_INVALID_PARAMETER,
                                    "libevent logging cannot be updated when "
                                    "using libevent before v2.1.1.");
             }
         }
     }
 
     UniValue result(UniValue::VOBJ);
     std::vector<CLogCategoryActive> vLogCatActive = ListActiveLogCategories();
     for (const auto &logCatActive : vLogCatActive) {
         result.pushKV(logCatActive.category, logCatActive.active);
     }
 
     return result;
 }
 
 static UniValue echo(const Config &config, const JSONRPCRequest &request) {
     if (request.fHelp) {
         throw std::runtime_error(RPCHelpMan{
             "echo|echojson ...",
             "\nSimply echo back the input arguments. This command is for "
             "testing.\n"
             "\nThe difference between echo and echojson is that echojson has "
             "argument conversion enabled in the client-side table in "
             "bitcoin-cli and the GUI. There is no server-side difference.",
             {},
             RPCResults{},
             RPCExamples{""},
         }
                                      .ToString());
     }
 
     CHECK_NONFATAL(request.params.size() != 100);
 
     return request.params;
 }
 
 // clang-format off
 static const CRPCCommand commands[] = {
     //  category            name                      actor (function)        argNames
     //  ------------------- ------------------------  ----------------------  ----------
     { "control",            "getmemoryinfo",          getmemoryinfo,          {"mode"} },
     { "control",            "logging",                logging,                {"include", "exclude"} },
     { "util",               "validateaddress",        validateaddress,        {"address"} },
     { "util",               "createmultisig",         createmultisig,         {"nrequired","keys"} },
+    { "util",               "deriveaddresses",        deriveaddresses,        {"descriptor", "begin", "end"} },
     { "util",               "verifymessage",          verifymessage,          {"address","signature","message"} },
     { "util",               "signmessagewithprivkey", signmessagewithprivkey, {"privkey","message"} },
     /* Not shown in help */
     { "hidden",             "setmocktime",            setmocktime,            {"timestamp"}},
     { "hidden",             "echo",                   echo,                   {"arg0","arg1","arg2","arg3","arg4","arg5","arg6","arg7","arg8","arg9"}},
     { "hidden",             "echojson",               echo,                   {"arg0","arg1","arg2","arg3","arg4","arg5","arg6","arg7","arg8","arg9"}},
 };
 // clang-format on
 
 void RegisterMiscRPCCommands(CRPCTable &t) {
     for (unsigned int vcidx = 0; vcidx < ARRAYLEN(commands); vcidx++) {
         t.appendCommand(commands[vcidx].name, &commands[vcidx]);
     }
 }
diff --git a/test/functional/rpc_deriveaddresses.py b/test/functional/rpc_deriveaddresses.py
new file mode 100755
index 000000000..66d075217
--- /dev/null
+++ b/test/functional/rpc_deriveaddresses.py
@@ -0,0 +1,90 @@
+#!/usr/bin/env python3
+# Copyright (c) 2018 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Test the deriveaddresses rpc call."""
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import assert_equal, assert_raises_rpc_error
+
+
+class DeriveaddressesTest(BitcoinTestFramework):
+    def set_test_params(self):
+        self.num_nodes = 1
+        self.supports_cli = 1
+
+    def run_test(self):
+        assert_raises_rpc_error(-5, "Invalid descriptor",
+                                self.nodes[0].deriveaddresses, "a")
+
+        descriptor = "pkh(tprv8ZgxMBicQKsPd7Uf69XL1XwhmjHopUGep8GuEiJDZmbQz6o58LninorQAfcKZWARbtRtfnLcJ5MQ2AtHcQJCCRUcMRvmDUjyEmNUWwx8UbK/1/1/0)"
+        address = "bchreg:qzgrvmwc8vevauc25j86hgfpduz8j98yvvyr0qx0ew"
+
+        assert_equal(self.nodes[0].deriveaddresses(descriptor), [address])
+
+        descriptor_pubkey = "pkh(tpubD6NzVbkrYhZ4WaWSyoBvQwbpLkojyoTZPRsgXELWz3Popb3qkjcJyJUGLnL4qHHoQvao8ESaAstxYSnhyswJ76uZPStJRJCTKvosUCJZL5B/1/1/0)"
+        address = "bchreg:qzgrvmwc8vevauc25j86hgfpduz8j98yvvyr0qx0ew"
+
+        assert_equal(self.nodes[0].deriveaddresses(
+            descriptor_pubkey), [address])
+
+        ranged_descriptor = "pkh(tprv8ZgxMBicQKsPd7Uf69XL1XwhmjHopUGep8GuEiJDZmbQz6o58LninorQAfcKZWARbtRtfnLcJ5MQ2AtHcQJCCRUcMRvmDUjyEmNUWwx8UbK/1/1/*)"
+        assert_equal(
+            self.nodes[0].deriveaddresses(ranged_descriptor, 0, 2),
+            [address, "bchreg:qz7mjsvr6gglnl389gnfxmqx0asxp0hcvqjx829c6k", "bchreg:qq9q9wefpjzuna7qhuzz7rvck9tuhrzp3gvrzd8kx2"])
+
+        assert_raises_rpc_error(
+            -8,
+            "Range should not be specified for an un-ranged descriptor",
+            self.nodes[0].deriveaddresses,
+            "pkh(tprv8ZgxMBicQKsPd7Uf69XL1XwhmjHopUGep8GuEiJDZmbQz6o58LninorQAfcKZWARbtRtfnLcJ5MQ2AtHcQJCCRUcMRvmDUjyEmNUWwx8UbK/1/1/0)",
+            0,
+            2)
+
+        assert_raises_rpc_error(
+            -8,
+            "Range must be specified for a ranged descriptor",
+            self.nodes[0].deriveaddresses,
+            "pkh(tprv8ZgxMBicQKsPd7Uf69XL1XwhmjHopUGep8GuEiJDZmbQz6o58LninorQAfcKZWARbtRtfnLcJ5MQ2AtHcQJCCRUcMRvmDUjyEmNUWwx8UbK/1/1/*)")
+
+        assert_raises_rpc_error(
+            -8,
+            "Missing range end parameter",
+            self.nodes[0].deriveaddresses,
+            "pkh(tprv8ZgxMBicQKsPd7Uf69XL1XwhmjHopUGep8GuEiJDZmbQz6o58LninorQAfcKZWARbtRtfnLcJ5MQ2AtHcQJCCRUcMRvmDUjyEmNUWwx8UbK/1/1/*)",
+            0)
+
+        assert_raises_rpc_error(
+            -8,
+            "Range end should be equal to or greater than begin",
+            self.nodes[0].deriveaddresses,
+            "pkh(tprv8ZgxMBicQKsPd7Uf69XL1XwhmjHopUGep8GuEiJDZmbQz6o58LninorQAfcKZWARbtRtfnLcJ5MQ2AtHcQJCCRUcMRvmDUjyEmNUWwx8UbK/1/1/*)",
+            2,
+            0)
+
+        assert_raises_rpc_error(
+            -8,
+            "Range should be greater or equal than 0",
+            self.nodes[0].deriveaddresses,
+            "pkh(tprv8ZgxMBicQKsPd7Uf69XL1XwhmjHopUGep8GuEiJDZmbQz6o58LninorQAfcKZWARbtRtfnLcJ5MQ2AtHcQJCCRUcMRvmDUjyEmNUWwx8UbK/1/1/*)",
+            -1,
+            0)
+
+        combo_descriptor = "combo(tprv8ZgxMBicQKsPd7Uf69XL1XwhmjHopUGep8GuEiJDZmbQz6o58LninorQAfcKZWARbtRtfnLcJ5MQ2AtHcQJCCRUcMRvmDUjyEmNUWwx8UbK/1/1/0)"
+        assert_equal(self.nodes[0].deriveaddresses(
+            combo_descriptor), [address, address])
+
+        hardened_without_privkey_descriptor = "pkh(tpubD6NzVbkrYhZ4WaWSyoBvQwbpLkojyoTZPRsgXELWz3Popb3qkjcJyJUGLnL4qHHoQvao8ESaAstxYSnhyswJ76uZPStJRJCTKvosUCJZL5B/1'/1/0)"
+        assert_raises_rpc_error(-5,
+                                "Cannot derive script without private keys",
+                                self.nodes[0].deriveaddresses,
+                                hardened_without_privkey_descriptor)
+
+        bare_multisig_descriptor = "multi(1, tpubD6NzVbkrYhZ4WaWSyoBvQwbpLkojyoTZPRsgXELWz3Popb3qkjcJyJUGLnL4qHHoQvao8ESaAstxYSnhyswJ76uZPStJRJCTKvosUCJZL5B/1/1/0, tpubD6NzVbkrYhZ4WaWSyoBvQwbpLkojyoTZPRsgXELWz3Popb3qkjcJyJUGLnL4qHHoQvao8ESaAstxYSnhyswJ76uZPStJRJCTKvosUCJZL5B/1/1/1)"
+        assert_raises_rpc_error(-5,
+                                "Descriptor does not have a corresponding address",
+                                self.nodes[0].deriveaddresses,
+                                bare_multisig_descriptor)
+
+
+if __name__ == '__main__':
+    DeriveaddressesTest().main()
diff --git a/test/functional/test_runner.py b/test/functional/test_runner.py
index 2ddd077bc..2efd6c356 100755
--- a/test/functional/test_runner.py
+++ b/test/functional/test_runner.py
@@ -1,871 +1,872 @@
 #!/usr/bin/env python3
 # Copyright (c) 2014-2019 The Bitcoin Core developers
 # Copyright (c) 2017 The Bitcoin developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Run regression test suite.
 
 This module calls down into individual test cases via subprocess. It will
 forward all unrecognized arguments onto the individual test scripts.
 
 Functional tests are disabled on Windows by default. Use --force to run them anyway.
 
 For a description of arguments recognized by test scripts, see
 `test/functional/test_framework/test_framework.py:BitcoinTestFramework.main`.
 
 """
 
 import argparse
 from collections import deque
 import configparser
 import datetime
 import os
 import time
 import shutil
 import sys
 import subprocess
 import tempfile
 import re
 import logging
 import xml.etree.ElementTree as ET
 import json
 import threading
 import multiprocessing
 from queue import Queue, Empty
 
 # Formatting. Default colors to empty strings.
 BOLD, GREEN, RED, GREY = ("", ""), ("", ""), ("", ""), ("", "")
 try:
     # Make sure python thinks it can write unicode to its stdout
     "\u2713".encode("utf_8").decode(sys.stdout.encoding)
     TICK = "✓ "
     CROSS = "✖ "
     CIRCLE = "○ "
 except UnicodeDecodeError:
     TICK = "P "
     CROSS = "x "
     CIRCLE = "o "
 
 if os.name != 'nt' or sys.getwindowsversion() >= (10, 0, 14393):
     if os.name == 'nt':
         import ctypes
         kernel32 = ctypes.windll.kernel32
         ENABLE_VIRTUAL_TERMINAL_PROCESSING = 4
         STD_OUTPUT_HANDLE = -11
         STD_ERROR_HANDLE = -12
         # Enable ascii color control to stdout
         stdout = kernel32.GetStdHandle(STD_OUTPUT_HANDLE)
         stdout_mode = ctypes.c_int32()
         kernel32.GetConsoleMode(stdout, ctypes.byref(stdout_mode))
         kernel32.SetConsoleMode(
             stdout, stdout_mode.value | ENABLE_VIRTUAL_TERMINAL_PROCESSING)
         # Enable ascii color control to stderr
         stderr = kernel32.GetStdHandle(STD_ERROR_HANDLE)
         stderr_mode = ctypes.c_int32()
         kernel32.GetConsoleMode(stderr, ctypes.byref(stderr_mode))
         kernel32.SetConsoleMode(
             stderr, stderr_mode.value | ENABLE_VIRTUAL_TERMINAL_PROCESSING)
     # primitive formatting on supported
     # terminal via ANSI escape sequences:
     BOLD = ('\033[0m', '\033[1m')
     GREEN = ('\033[0m', '\033[0;32m')
     RED = ('\033[0m', '\033[0;31m')
     GREY = ('\033[0m', '\033[1;30m')
 
 TEST_EXIT_PASSED = 0
 TEST_EXIT_SKIPPED = 77
 
 NON_SCRIPTS = [
     # These are python files that live in the functional tests directory, but
     # are not test scripts.
     "combine_logs.py",
     "create_cache.py",
     "test_runner.py",
 ]
 
 TEST_PARAMS = {
     # Some test can be run with additional parameters.
     # When a test is listed here, the it  will be run without parameters
     # as well as with additional parameters listed here.
     # This:
     #    example "testName" : [["--param1", "--param2"] , ["--param3"]]
     # will run the test 3 times:
     #    testName
     #    testName --param1 --param2
     #    testname --param3
+    "rpc_deriveaddresses.py": [["--usecli"]],
     "wallet_txn_doublespend.py": [["--mineblock"]],
     "wallet_txn_clone.py": [["--mineblock"]],
     "wallet_createwallet.py": [["--usecli"]],
     "wallet_multiwallet.py": [["--usecli"]],
 }
 
 # Used to limit the number of tests, when list of tests is not provided on command line
 # When --extended is specified, we run all tests, otherwise
 # we only run a test if its execution time in seconds does not exceed
 # EXTENDED_CUTOFF
 DEFAULT_EXTENDED_CUTOFF = 40
 DEFAULT_JOBS = (multiprocessing.cpu_count() // 3) + 1
 
 
 class TestCase():
     """
     Data structure to hold and run information necessary to launch a test case.
     """
 
     def __init__(self, test_num, test_case, tests_dir,
                  tmpdir, failfast_event, flags=None):
         self.tests_dir = tests_dir
         self.tmpdir = tmpdir
         self.test_case = test_case
         self.test_num = test_num
         self.failfast_event = failfast_event
         self.flags = flags
 
     def run(self, portseed_offset):
         if self.failfast_event.is_set():
             return TestResult(self.test_num, self.test_case,
                               "", "Skipped", 0, "", "")
 
         portseed = self.test_num + portseed_offset
         portseed_arg = ["--portseed={}".format(portseed)]
         log_stdout = tempfile.SpooledTemporaryFile(max_size=2**16)
         log_stderr = tempfile.SpooledTemporaryFile(max_size=2**16)
         test_argv = self.test_case.split()
         testdir = os.path.join("{}", "{}_{}").format(
             self.tmpdir, re.sub(".py$", "", test_argv[0]), portseed)
         tmpdir_arg = ["--tmpdir={}".format(testdir)]
         time0 = time.time()
         process = subprocess.Popen([sys.executable, os.path.join(self.tests_dir, test_argv[0])] + test_argv[1:] + self.flags + portseed_arg + tmpdir_arg,
                                    universal_newlines=True,
                                    stdout=log_stdout,
                                    stderr=log_stderr)
 
         process.wait()
         log_stdout.seek(0), log_stderr.seek(0)
         [stdout, stderr] = [log.read().decode('utf-8')
                             for log in (log_stdout, log_stderr)]
         log_stdout.close(), log_stderr.close()
         if process.returncode == TEST_EXIT_PASSED and stderr == "":
             status = "Passed"
         elif process.returncode == TEST_EXIT_SKIPPED:
             status = "Skipped"
         else:
             status = "Failed"
 
         return TestResult(self.test_num, self.test_case, testdir, status,
                           int(time.time() - time0), stdout, stderr)
 
 
 def on_ci():
     return os.getenv('TRAVIS') == 'true' or os.getenv(
         'TEAMCITY_VERSION') is not None
 
 
 def main():
     # Read config generated by configure.
     config = configparser.ConfigParser()
     configfile = os.path.join(os.path.abspath(
         os.path.dirname(__file__)), "..", "config.ini")
     config.read_file(open(configfile, encoding="utf8"))
 
     src_dir = config["environment"]["SRCDIR"]
     build_dir = config["environment"]["BUILDDIR"]
     tests_dir = os.path.join(src_dir, 'test', 'functional')
 
     # Parse arguments and pass through unrecognised args
     parser = argparse.ArgumentParser(add_help=False,
                                      usage='%(prog)s [test_runner.py options] [script options] [scripts]',
                                      description=__doc__,
                                      epilog='''
     Help text and arguments for individual test script:''',
                                      formatter_class=argparse.ArgumentDefaultsHelpFormatter)
     parser.add_argument('--combinedlogslen', '-c', type=int, default=0,
                         help='print a combined log (of length n lines) from all test nodes and test framework to the console on failure.')
     parser.add_argument('--coverage', action='store_true',
                         help='generate a basic coverage report for the RPC interface')
     parser.add_argument(
         '--exclude', '-x', help='specify a comma-separated-list of scripts to exclude.')
     parser.add_argument('--extended', action='store_true',
                         help='run the extended test suite in addition to the basic tests')
     parser.add_argument('--cutoff', type=int, default=DEFAULT_EXTENDED_CUTOFF,
                         help='set the cutoff runtime for what tests get run')
     parser.add_argument('--force', '-f', action='store_true',
                         help='run tests even on platforms where they are disabled by default (e.g. windows).')
     parser.add_argument('--help', '-h', '-?',
                         action='store_true', help='print help text and exit')
     parser.add_argument('--jobs', '-j', type=int, default=DEFAULT_JOBS,
                         help='how many test scripts to run in parallel.')
     parser.add_argument('--keepcache', '-k', action='store_true',
                         help='the default behavior is to flush the cache directory on startup. --keepcache retains the cache from the previous testrun.')
     parser.add_argument('--quiet', '-q', action='store_true',
                         help='only print results summary and failure logs')
     parser.add_argument('--tmpdirprefix', '-t',
                         default=os.path.join(build_dir, 'test', 'tmp'), help="Root directory for datadirs")
     parser.add_argument(
         '--failfast',
         action='store_true',
         help='stop execution after the first test failure')
     parser.add_argument('--junitoutput', '-J', default='junit_results.xml',
                         help="File that will store JUnit formatted test results. If no absolute path is given it is treated as relative to the temporary directory.")
     parser.add_argument('--testsuitename', '-n', default='Bitcoin ABC functional tests',
                         help="Name of the test suite, as it will appear in the logs and in the JUnit report.")
     args, unknown_args = parser.parse_known_args()
 
     # args to be passed on always start with two dashes; tests are the
     # remaining unknown args
     tests = [arg for arg in unknown_args if arg[:2] != "--"]
     passon_args = [arg for arg in unknown_args if arg[:2] == "--"]
     passon_args.append("--configfile={}".format(configfile))
 
     # Set up logging
     logging_level = logging.INFO if args.quiet else logging.DEBUG
     logging.basicConfig(format='%(message)s', level=logging_level)
     logging.info("Starting {}".format(args.testsuitename))
 
     # Create base test directory
     tmpdir = os.path.join("{}", "test_runner_₿₵_🏃_{:%Y%m%d_%H%M%S}").format(
         args.tmpdirprefix, datetime.datetime.now())
 
     # If we fixed the command-line and filename encoding issue on Windows,
     # these two lines could be removed
     if config["environment"]["EXEEXT"] == ".exe":
         tmpdir = os.path.join("{}", "test_runner_{:%Y%m%d_%H%M%S}").format(
             args.tmpdirprefix, datetime.datetime.now())
 
     os.makedirs(tmpdir)
 
     logging.debug("Temporary test directory at {}".format(tmpdir))
 
     if not os.path.isabs(args.junitoutput):
         args.junitoutput = os.path.join(tmpdir, args.junitoutput)
 
     enable_bitcoind = config["components"].getboolean("ENABLE_BITCOIND")
 
     if config["environment"]["EXEEXT"] == ".exe" and not args.force:
         # https://github.com/bitcoin/bitcoin/commit/d52802551752140cf41f0d9a225a43e84404d3e9
         # https://github.com/bitcoin/bitcoin/pull/5677#issuecomment-136646964
         print(
             "Tests currently disabled on Windows by default. Use --force option to enable")
         sys.exit(0)
 
     if not enable_bitcoind:
         print("No functional tests to run.")
         print("Rerun ./configure with --with-daemon and then make")
         sys.exit(0)
 
     # Build list of tests
     all_scripts = get_all_scripts_from_disk(tests_dir, NON_SCRIPTS)
 
     # Check all tests with parameters actually exist
     for test in TEST_PARAMS:
         if test not in all_scripts:
             print("ERROR: Test with parameter {} does not exist, check it has "
                   "not been renamed or deleted".format(test))
             sys.exit(1)
 
     if tests:
         # Individual tests have been specified. Run specified tests that exist
         # in the all_scripts list. Accept the name with or without .py
         # extension.
         individual_tests = [
             re.sub(r"\.py$", "", t) + ".py" for t in tests if not t.endswith('*')]
         test_list = []
         for t in individual_tests:
             if t in all_scripts:
                 test_list.append(t)
             else:
                 print("{}WARNING!{} Test '{}' not found in full test list.".format(
                     BOLD[1], BOLD[0], t))
 
         # Allow for wildcard at the end of the name, so a single input can
         # match multiple tests
         for test in tests:
             if test.endswith('*'):
                 test_list.extend(
                     [t for t in all_scripts if t.startswith(test[:-1])])
 
         # do not cut off explicitly specified tests
         cutoff = sys.maxsize
     else:
         # No individual tests have been specified.
         # Run all tests that do not exceed
         test_list = all_scripts
         cutoff = args.cutoff
         if args.extended:
             cutoff = sys.maxsize
 
     # Remove the test cases that the user has explicitly asked to exclude.
     if args.exclude:
         tests_excl = [re.sub(r"\.py$", "", t)
                       + (".py" if ".py" not in t else "") for t in args.exclude.split(',')]
         for exclude_test in tests_excl:
             if exclude_test in test_list:
                 test_list.remove(exclude_test)
             else:
                 print("{}WARNING!{} Test '{}' not found in current test list.".format(
                     BOLD[1], BOLD[0], exclude_test))
 
     # Update timings from build_dir only if separate build directory is used.
     # We do not want to pollute source directory.
     build_timings = None
     if (src_dir != build_dir):
         build_timings = Timings(os.path.join(build_dir, 'timing.json'))
 
     # Always use timings from scr_dir if present
     src_timings = Timings(os.path.join(
         src_dir, "test", "functional", 'timing.json'))
 
     # Add test parameters and remove long running tests if needed
     test_list = get_tests_to_run(
         test_list, TEST_PARAMS, cutoff, src_timings)
 
     if not test_list:
         print("No valid test scripts specified. Check that your test is in one "
               "of the test lists in test_runner.py, or run test_runner.py with no arguments to run all tests")
         sys.exit(0)
 
     if args.help:
         # Print help for test_runner.py, then print help of the first script
         # and exit.
         parser.print_help()
         subprocess.check_call(
             [sys.executable, os.path.join(tests_dir, test_list[0]), '-h'])
         sys.exit(0)
 
     check_script_prefixes(all_scripts)
 
     if not args.keepcache:
         shutil.rmtree(os.path.join(build_dir, "test",
                                    "cache"), ignore_errors=True)
 
     run_tests(
         test_list,
         build_dir,
         tests_dir,
         args.junitoutput,
         tmpdir,
         num_jobs=args.jobs,
         test_suite_name=args.testsuitename,
         enable_coverage=args.coverage,
         args=passon_args,
         combined_logs_len=args.combinedlogslen,
         build_timings=build_timings,
         failfast=args.failfast
     )
 
 
 def run_tests(test_list, build_dir, tests_dir, junitoutput, tmpdir, num_jobs, test_suite_name,
               enable_coverage=False, args=None, combined_logs_len=0, build_timings=None, failfast=False):
     args = args or []
 
     # Warn if bitcoind is already running (unix only)
     try:
         pidofOutput = subprocess.check_output(["pidof", "bitcoind"])
         if pidofOutput is not None and pidofOutput != b'':
             print("{}WARNING!{} There is already a bitcoind process running on this system. Tests may fail unexpectedly due to resource contention!".format(
                 BOLD[1], BOLD[0]))
     except (OSError, subprocess.SubprocessError):
         pass
 
     # Warn if there is a cache directory
     cache_dir = os.path.join(build_dir, "test", "cache")
     if os.path.isdir(cache_dir):
         print("{}WARNING!{} There is a cache directory here: {}. If tests fail unexpectedly, try deleting the cache directory.".format(
             BOLD[1], BOLD[0], cache_dir))
 
     flags = ['--cachedir={}'.format(cache_dir)] + args
 
     if enable_coverage:
         coverage = RPCCoverage()
         flags.append(coverage.flag)
         logging.debug(
             "Initializing coverage directory at {}".format(coverage.dir))
     else:
         coverage = None
 
     if len(test_list) > 1 and num_jobs > 1:
         # Populate cache
         try:
             subprocess.check_output([sys.executable, os.path.join(
                 tests_dir, 'create_cache.py')] + flags + [os.path.join("--tmpdir={}", "cache") .format(tmpdir)])
         except subprocess.CalledProcessError as e:
             sys.stdout.buffer.write(e.output)
             raise
 
     # Run Tests
     time0 = time.time()
     test_results = execute_test_processes(
         num_jobs, test_list, tests_dir, tmpdir, flags, failfast)
     runtime = int(time.time() - time0)
 
     max_len_name = len(max(test_list, key=len))
     print_results(test_results, tests_dir, max_len_name,
                   runtime, combined_logs_len)
     save_results_as_junit(test_results, junitoutput, runtime, test_suite_name)
 
     if (build_timings is not None):
         build_timings.save_timings(test_results)
 
     if coverage:
         coverage_passed = coverage.report_rpc_coverage()
 
         logging.debug("Cleaning up coverage data")
         coverage.cleanup()
     else:
         coverage_passed = True
 
     # Clear up the temp directory if all subdirectories are gone
     if not os.listdir(tmpdir):
         os.rmdir(tmpdir)
 
     all_passed = all(map(
         lambda test_result: test_result.was_successful, test_results)) and coverage_passed
 
     sys.exit(not all_passed)
 
 
 def execute_test_processes(
         num_jobs, test_list, tests_dir, tmpdir, flags, failfast=False):
     update_queue = Queue()
     job_queue = Queue()
     failfast_event = threading.Event()
     test_results = []
     poll_timeout = 10  # seconds
     # In case there is a graveyard of zombie bitcoinds, we can apply a
     # pseudorandom offset to hopefully jump over them.
     # (625 is PORT_RANGE/MAX_NODES)
     portseed_offset = int(time.time() * 1000) % 625
 
     ##
     # Define some helper functions we will need for threading.
     ##
 
     def handle_message(message, running_jobs):
         """
         handle_message handles a single message from handle_test_cases
         """
         if isinstance(message, TestCase):
             running_jobs.append((message.test_num, message.test_case))
             print("{}{}{} started".format(BOLD[1], message.test_case, BOLD[0]))
             return
 
         if isinstance(message, TestResult):
             test_result = message
 
             running_jobs.remove((test_result.num, test_result.name))
             test_results.append(test_result)
 
             if test_result.status == "Passed":
                 print("{}{}{} passed, Duration: {} s".format(
                     BOLD[1], test_result.name, BOLD[0], test_result.time))
             elif test_result.status == "Skipped":
                 print("{}{}{} skipped".format(
                     BOLD[1], test_result.name, BOLD[0]))
             else:
                 print("{}{}{} failed, Duration: {} s\n".format(
                     BOLD[1], test_result.name, BOLD[0], test_result.time))
                 print(BOLD[1] + 'stdout:' + BOLD[0])
                 print(test_result.stdout)
                 print(BOLD[1] + 'stderr:' + BOLD[0])
                 print(test_result.stderr)
 
                 if failfast:
                     logging.debug("Early exiting after test failure")
                     failfast_event.set()
             return
 
         assert False, "we should not be here"
 
     def handle_update_messages():
         """
         handle_update_messages waits for messages to be sent from handle_test_cases via the
         update_queue.  It serializes the results so we can print nice status update messages.
         """
         printed_status = False
         running_jobs = []
 
         while True:
             message = None
             try:
                 message = update_queue.get(True, poll_timeout)
                 if message is None:
                     break
 
                 # We printed a status message, need to kick to the next line
                 # before printing more.
                 if printed_status:
                     print()
                     printed_status = False
 
                 handle_message(message, running_jobs)
                 update_queue.task_done()
             except Empty:
                 if not on_ci():
                     print("Running jobs: {}".format(
                         ", ".join([j[1] for j in running_jobs])), end="\r")
                     sys.stdout.flush()
                     printed_status = True
 
     def handle_test_cases():
         """
         job_runner represents a single thread that is part of a worker pool.
         It waits for a test, then executes that test.
         It also reports start and result messages to handle_update_messages
         """
         while True:
             test = job_queue.get()
             if test is None:
                 break
             # Signal that the test is starting to inform the poor waiting
             # programmer
             update_queue.put(test)
             result = test.run(portseed_offset)
             update_queue.put(result)
             job_queue.task_done()
 
     ##
     # Setup our threads, and start sending tasks
     ##
 
     # Start our result collection thread.
     resultCollector = threading.Thread(target=handle_update_messages)
     resultCollector.daemon = True
     resultCollector.start()
 
     # Start some worker threads
     for j in range(num_jobs):
         t = threading.Thread(target=handle_test_cases)
         t.daemon = True
         t.start()
 
     # Push all our test cases into the job queue.
     for i, t in enumerate(test_list):
         job_queue.put(TestCase(i, t, tests_dir, tmpdir, failfast_event, flags))
 
     # Wait for all the jobs to be completed
     job_queue.join()
 
     # Wait for all the results to be compiled
     update_queue.join()
 
     # Flush our queues so the threads exit
     update_queue.put(None)
     for j in range(num_jobs):
         job_queue.put(None)
 
     return test_results
 
 
 def print_results(test_results, tests_dir, max_len_name,
                   runtime, combined_logs_len):
     results = "\n" + BOLD[1] + "{} | {} | {}\n\n".format(
         "TEST".ljust(max_len_name), "STATUS   ", "DURATION") + BOLD[0]
 
     test_results.sort(key=TestResult.sort_key)
     all_passed = True
     time_sum = 0
 
     for test_result in test_results:
         all_passed = all_passed and test_result.was_successful
         time_sum += test_result.time
         test_result.padding = max_len_name
         results += str(test_result)
 
         testdir = test_result.testdir
         if combined_logs_len and os.path.isdir(testdir):
             # Print the final `combinedlogslen` lines of the combined logs
             print('{}Combine the logs and print the last {} lines ...{}'.format(
                 BOLD[1], combined_logs_len, BOLD[0]))
             print('\n============')
             print('{}Combined log for {}:{}'.format(BOLD[1], testdir, BOLD[0]))
             print('============\n')
             combined_logs_args = [
                 sys.executable, os.path.join(
                     tests_dir, 'combine_logs.py'), testdir]
 
             if BOLD[0]:
                 combined_logs_args += ['--color']
                 combined_logs, _ = subprocess.Popen(
                     combined_logs_args, universal_newlines=True, stdout=subprocess.PIPE).communicate()
             print(
                 "\n".join(
                     deque(
                         combined_logs.splitlines(),
                         combined_logs_len)))
 
     status = TICK + "Passed" if all_passed else CROSS + "Failed"
     if not all_passed:
         results += RED[1]
     results += BOLD[1] + "\n{} | {} | {} s (accumulated) \n".format(
         "ALL".ljust(max_len_name), status.ljust(9), time_sum) + BOLD[0]
     if not all_passed:
         results += RED[0]
     results += "Runtime: {} s\n".format(runtime)
     print(results)
 
 
 class TestResult():
     """
     Simple data structure to store test result values and print them properly
     """
 
     def __init__(self, num, name, testdir, status, time, stdout, stderr):
         self.num = num
         self.name = name
         self.testdir = testdir
         self.status = status
         self.time = time
         self.padding = 0
         self.stdout = stdout
         self.stderr = stderr
 
     def sort_key(self):
         if self.status == "Passed":
             return 0, self.name.lower()
         elif self.status == "Failed":
             return 2, self.name.lower()
         elif self.status == "Skipped":
             return 1, self.name.lower()
 
     def __repr__(self):
         if self.status == "Passed":
             color = GREEN
             glyph = TICK
         elif self.status == "Failed":
             color = RED
             glyph = CROSS
         elif self.status == "Skipped":
             color = GREY
             glyph = CIRCLE
 
         return color[1] + "{} | {}{} | {} s\n".format(
             self.name.ljust(self.padding), glyph, self.status.ljust(7), self.time) + color[0]
 
     @property
     def was_successful(self):
         return self.status != "Failed"
 
 
 def get_all_scripts_from_disk(test_dir, non_scripts):
     """
     Return all available test script from script directory (excluding NON_SCRIPTS)
     """
     python_files = set([t for t in os.listdir(test_dir) if t[-3:] == ".py"])
     return list(python_files - set(non_scripts))
 
 
 def check_script_prefixes(all_scripts):
     """Check that no more than `EXPECTED_VIOLATION_COUNT` of the
        test scripts don't start with one of the allowed name prefixes."""
     EXPECTED_VIOLATION_COUNT = 20
 
     # LEEWAY is provided as a transition measure, so that pull-requests
     # that introduce new tests that don't conform with the naming
     # convention don't immediately cause the tests to fail.
     LEEWAY = 0
 
     good_prefixes_re = re.compile(
         "(abc_)?(example|feature|interface|mempool|mining|p2p|rpc|wallet|tool)_")
     bad_script_names = [
         script for script in all_scripts if good_prefixes_re.match(script) is None]
 
     if len(bad_script_names) < EXPECTED_VIOLATION_COUNT:
         print(
             "{}HURRAY!{} Number of functional tests violating naming convention reduced!".format(
                 BOLD[1],
                 BOLD[0]))
         print("Consider reducing EXPECTED_VIOLATION_COUNT from {} to {}".format(
             EXPECTED_VIOLATION_COUNT, len(bad_script_names)))
     elif len(bad_script_names) > EXPECTED_VIOLATION_COUNT:
         print(
             "INFO: {} tests not meeting naming conventions (expected {}):".format(len(bad_script_names), EXPECTED_VIOLATION_COUNT))
         print("  {}".format("\n  ".join(sorted(bad_script_names))))
         assert len(bad_script_names) <= EXPECTED_VIOLATION_COUNT + \
             LEEWAY, "Too many tests not following naming convention! ({} found, expected: <= {})".format(
                 len(bad_script_names), EXPECTED_VIOLATION_COUNT)
 
 
 def get_tests_to_run(test_list, test_params, cutoff, src_timings):
     """
     Returns only test that will not run longer that cutoff.
     Long running tests are returned first to favor running tests in parallel
     Timings from build directory override those from src directory
     """
 
     def get_test_time(test):
         # Return 0 if test is unknown to always run it
         return next(
             (x['time'] for x in src_timings.existing_timings if x['name'] == test), 0)
 
     # Some tests must also be run with additional parameters. Add them to the
     # list.
     tests_with_params = []
     for test_name in test_list:
         # always execute a test without parameters
         tests_with_params.append(test_name)
         params = test_params.get(test_name)
         if params is not None:
             tests_with_params.extend(
                 [test_name + " " + " ".join(p) for p in params])
 
     result = [t for t in tests_with_params if get_test_time(t) <= cutoff]
     result.sort(key=lambda x: (-get_test_time(x), x))
     return result
 
 
 class RPCCoverage():
     """
     Coverage reporting utilities for test_runner.
 
     Coverage calculation works by having each test script subprocess write
     coverage files into a particular directory. These files contain the RPC
     commands invoked during testing, as well as a complete listing of RPC
     commands per `bitcoin-cli help` (`rpc_interface.txt`).
 
     After all tests complete, the commands run are combined and diff'd against
     the complete list to calculate uncovered RPC commands.
 
     See also: test/functional/test_framework/coverage.py
 
     """
 
     def __init__(self):
         self.dir = tempfile.mkdtemp(prefix="coverage")
         self.flag = '--coveragedir={}'.format(self.dir)
 
     def report_rpc_coverage(self):
         """
         Print out RPC commands that were unexercised by tests.
 
         """
         uncovered = self._get_uncovered_rpc_commands()
 
         if uncovered:
             print("Uncovered RPC commands:")
             print("".join(("  - {}\n".format(i)) for i in sorted(uncovered)))
             return False
         else:
             print("All RPC commands covered.")
             return True
 
     def cleanup(self):
         return shutil.rmtree(self.dir)
 
     def _get_uncovered_rpc_commands(self):
         """
         Return a set of currently untested RPC commands.
 
         """
         # This is shared from `test/functional/test-framework/coverage.py`
         reference_filename = 'rpc_interface.txt'
         coverage_file_prefix = 'coverage.'
 
         coverage_ref_filename = os.path.join(self.dir, reference_filename)
         coverage_filenames = set()
         all_cmds = set()
         covered_cmds = set()
 
         if not os.path.isfile(coverage_ref_filename):
             raise RuntimeError("No coverage reference found")
 
         with open(coverage_ref_filename, 'r', encoding="utf8") as f:
             all_cmds.update([i.strip() for i in f.readlines()])
 
         for root, dirs, files in os.walk(self.dir):
             for filename in files:
                 if filename.startswith(coverage_file_prefix):
                     coverage_filenames.add(os.path.join(root, filename))
 
         for filename in coverage_filenames:
             with open(filename, 'r', encoding="utf8") as f:
                 covered_cmds.update([i.strip() for i in f.readlines()])
 
         return all_cmds - covered_cmds
 
 
 def save_results_as_junit(test_results, file_name, time, test_suite_name):
     """
     Save tests results to file in JUnit format
 
     See http://llg.cubic.org/docs/junit/ for specification of format
     """
     e_test_suite = ET.Element("testsuite",
                               {"name": "{}".format(test_suite_name),
                                "tests": str(len(test_results)),
                                # "errors":
                                "failures": str(len([t for t in test_results if t.status == "Failed"])),
                                "id": "0",
                                "skipped": str(len([t for t in test_results if t.status == "Skipped"])),
                                "time": str(time),
                                "timestamp": datetime.datetime.now().isoformat('T')
                                })
 
     for test_result in test_results:
         e_test_case = ET.SubElement(e_test_suite, "testcase",
                                     {"name": test_result.name,
                                      "classname": test_result.name,
                                      "time": str(test_result.time)
                                      }
                                     )
         if test_result.status == "Skipped":
             ET.SubElement(e_test_case, "skipped")
         elif test_result.status == "Failed":
             ET.SubElement(e_test_case, "failure")
         # no special element for passed tests
 
         ET.SubElement(e_test_case, "system-out").text = test_result.stdout
         ET.SubElement(e_test_case, "system-err").text = test_result.stderr
 
     ET.ElementTree(e_test_suite).write(
         file_name, "UTF-8", xml_declaration=True)
 
 
 class Timings():
     """
     Takes care of loading, merging and saving tests execution times.
     """
 
     def __init__(self, timing_file):
         self.timing_file = timing_file
         self.existing_timings = self.load_timings()
 
     def load_timings(self):
         if os.path.isfile(self.timing_file):
             with open(self.timing_file, encoding="utf8") as f:
                 return json.load(f)
         else:
             return []
 
     def get_merged_timings(self, new_timings):
         """
         Return new list containing existing timings updated with new timings
         Tests that do not exists are not removed
         """
 
         key = 'name'
         merged = {}
         for item in self.existing_timings + new_timings:
             if item[key] in merged:
                 merged[item[key]].update(item)
             else:
                 merged[item[key]] = item
 
         # Sort the result to preserve test ordering in file
         merged = list(merged.values())
         merged.sort(key=lambda t, key=key: t[key])
         return merged
 
     def save_timings(self, test_results):
         # we only save test that have passed - timings for failed test might be
         # wrong (timeouts or early fails)
         passed_results = [t for t in test_results if t.status == 'Passed']
         new_timings = list(map(lambda t: {'name': t.name, 'time': t.time},
                                passed_results))
         merged_timings = self.get_merged_timings(new_timings)
 
         with open(self.timing_file, 'w', encoding="utf8") as f:
             json.dump(merged_timings, f, indent=True)
 
 
 if __name__ == '__main__':
     main()