Merge pull request #6961

fa41d4c [qt] Move GUI related HelpMessage() part downstream (MarcoFalke)
faf93f3 [trivial] Reuse translation and cleanup DEFAULT_* values (MarcoFalke)
3307bdb Bugfix: Omit wallet-related options from -help when wallet is not supported (Luke Dashjr)
b966aa8 Constrain constant values to a single location in code (Luke Dashjr)

29 files changed, 157 insertions, 99 deletions

diff --git a/src/bitcoin-cli.cpp b/src/bitcoin-cli.cpp
index 9564573657..58ced1ade9 100644
--- a/src/bitcoin-cli.cpp
+++ b/src/bitcoin-cli.cpp
@@ -22,6 +22,7 @@
 
 using namespace std;
 
+static const char DEFAULT_RPCCONNECT[] = "127.0.0.1";
 static const int DEFAULT_HTTP_CLIENT_TIMEOUT=900;
 
 std::string HelpMessageCli()
@@ -29,10 +30,10 @@ std::string HelpMessageCli()
     string strUsage;
     strUsage += HelpMessageGroup(_("Options:"));
     strUsage += HelpMessageOpt("-?", _("This help message"));
-    strUsage += HelpMessageOpt("-conf=<file>", strprintf(_("Specify configuration file (default: %s)"), "bitcoin.conf"));
+    strUsage += HelpMessageOpt("-conf=<file>", strprintf(_("Specify configuration file (default: %s)"), BITCOIN_CONF_FILENAME));
     strUsage += HelpMessageOpt("-datadir=<dir>", _("Specify data directory"));
     AppendParamsHelpMessages(strUsage);
-    strUsage += HelpMessageOpt("-rpcconnect=<ip>", strprintf(_("Send commands to node running on <ip> (default: %s)"), "127.0.0.1"));
+    strUsage += HelpMessageOpt("-rpcconnect=<ip>", strprintf(_("Send commands to node running on <ip> (default: %s)"), DEFAULT_RPCCONNECT));
     strUsage += HelpMessageOpt("-rpcport=<port>", strprintf(_("Connect to JSON-RPC on <port> (default: %u or testnet: %u)"), 8332, 18332));
     strUsage += HelpMessageOpt("-rpcwait", _("Wait for RPC server to start"));
     strUsage += HelpMessageOpt("-rpcuser=<user>", _("Username for JSON-RPC connections"));
@@ -141,7 +142,7 @@ static void http_request_done(struct evhttp_request *req, void *ctx)
 
 UniValue CallRPC(const string& strMethod, const UniValue& params)
 {
-    std::string host = GetArg("-rpcconnect", "127.0.0.1");
+    std::string host = GetArg("-rpcconnect", DEFAULT_RPCCONNECT);
     int port = GetArg("-rpcport", BaseParams().RPCPort());
 
     // Create event base
diff --git a/src/init.cpp b/src/init.cpp
index 12999668b5..1c2f3f49d4 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -66,6 +66,10 @@ using namespace std;
 CWallet* pwalletMain = NULL;
 #endif
 bool fFeeEstimatesInitialized = false;
+static const bool DEFAULT_PROXYRANDOMIZE = true;
+static const bool DEFAULT_REST_ENABLE = false;
+static const bool DEFAULT_DISABLE_SAFEMODE = false;
+static const bool DEFAULT_STOPAFTERBLOCKIMPORT = false;
 
 #if ENABLE_ZMQ
 static CZMQNotificationInterface* pzmqNotificationInterface = NULL;
@@ -296,7 +300,7 @@ void OnRPCPreCommand(const CRPCCommand& cmd)
 {
     // Observe safe mode
     string strWarning = GetWarnings("rpc");
-    if (strWarning != "" && !GetBoolArg("-disablesafemode", false) &&
+    if (strWarning != "" && !GetBoolArg("-disablesafemode", DEFAULT_DISABLE_SAFEMODE) &&
         !cmd.okSafeMode)
         throw JSONRPCError(RPC_FORBIDDEN_BY_SAFE_MODE, string("Safe mode: ") + strWarning);
 }
@@ -316,7 +320,7 @@ std::string HelpMessage(HelpMessageMode mode)
         strUsage += HelpMessageOpt("-blocksonly", strprintf(_("Whether to operate in a blocks only mode (default: %u)"), DEFAULT_BLOCKSONLY));
     strUsage += HelpMessageOpt("-checkblocks=<n>", strprintf(_("How many blocks to check at startup (default: %u, 0 = all)"), DEFAULT_CHECKBLOCKS));
     strUsage += HelpMessageOpt("-checklevel=<n>", strprintf(_("How thorough the block verification of -checkblocks is (0-4, default: %u)"), DEFAULT_CHECKLEVEL));
-    strUsage += HelpMessageOpt("-conf=<file>", strprintf(_("Specify configuration file (default: %s)"), "bitcoin.conf"));
+    strUsage += HelpMessageOpt("-conf=<file>", strprintf(_("Specify configuration file (default: %s)"), BITCOIN_CONF_FILENAME));
     if (mode == HMM_BITCOIND)
     {
 #ifndef WIN32
@@ -332,7 +336,7 @@ std::string HelpMessage(HelpMessageMode mode)
     strUsage += HelpMessageOpt("-par=<n>", strprintf(_("Set the number of script verification threads (%u to %d, 0 = auto, <0 = leave that many cores free, default: %d)"),
         -GetNumCores(), MAX_SCRIPTCHECK_THREADS, DEFAULT_SCRIPTCHECK_THREADS));
 #ifndef WIN32
-    strUsage += HelpMessageOpt("-pid=<file>", strprintf(_("Specify pid file (default: %s)"), "bitcoind.pid"));
+    strUsage += HelpMessageOpt("-pid=<file>", strprintf(_("Specify pid file (default: %s)"), BITCOIN_PID_FILENAME));
 #endif
     strUsage += HelpMessageOpt("-prune=<n>", strprintf(_("Reduce storage requirements by pruning (deleting) old blocks. This mode is incompatible with -txindex and -rescan. "
             "Warning: Reverting this setting requires re-downloading the entire blockchain. "
@@ -341,33 +345,33 @@ std::string HelpMessage(HelpMessageMode mode)
 #ifndef WIN32
     strUsage += HelpMessageOpt("-sysperms", _("Create new files with system default permissions, instead of umask 077 (only effective with disabled wallet functionality)"));
 #endif
-    strUsage += HelpMessageOpt("-txindex", strprintf(_("Maintain a full transaction index, used by the getrawtransaction rpc call (default: %u)"), 0));
+    strUsage += HelpMessageOpt("-txindex", strprintf(_("Maintain a full transaction index, used by the getrawtransaction rpc call (default: %u)"), DEFAULT_TXINDEX));
 
     strUsage += HelpMessageGroup(_("Connection options:"));
     strUsage += HelpMessageOpt("-addnode=<ip>", _("Add a node to connect to and attempt to keep the connection open"));
-    strUsage += HelpMessageOpt("-banscore=<n>", strprintf(_("Threshold for disconnecting misbehaving peers (default: %u)"), 100));
-    strUsage += HelpMessageOpt("-bantime=<n>", strprintf(_("Number of seconds to keep misbehaving peers from reconnecting (default: %u)"), 86400));
+    strUsage += HelpMessageOpt("-banscore=<n>", strprintf(_("Threshold for disconnecting misbehaving peers (default: %u)"), DEFAULT_BANSCORE_THRESHOLD));
+    strUsage += HelpMessageOpt("-bantime=<n>", strprintf(_("Number of seconds to keep misbehaving peers from reconnecting (default: %u)"), DEFAULT_MISBEHAVING_BANTIME));
     strUsage += HelpMessageOpt("-bind=<addr>", _("Bind to given address and always listen on it. Use [host]:port notation for IPv6"));
     strUsage += HelpMessageOpt("-connect=<ip>", _("Connect only to the specified node(s)"));
     strUsage += HelpMessageOpt("-discover", _("Discover own IP addresses (default: 1 when listening and no -externalip or -proxy)"));
-    strUsage += HelpMessageOpt("-dns", _("Allow DNS lookups for -addnode, -seednode and -connect") + " " + _("(default: 1)"));
+    strUsage += HelpMessageOpt("-dns", _("Allow DNS lookups for -addnode, -seednode and -connect") + " " + strprintf(_("(default: %u)"), DEFAULT_NAME_LOOKUP));
     strUsage += HelpMessageOpt("-dnsseed", _("Query for peer addresses via DNS lookup, if low on addresses (default: 1 unless -connect)"));
     strUsage += HelpMessageOpt("-externalip=<ip>", _("Specify your own public address"));
-    strUsage += HelpMessageOpt("-forcednsseed", strprintf(_("Always query for peer addresses via DNS lookup (default: %u)"), 0));
+    strUsage += HelpMessageOpt("-forcednsseed", strprintf(_("Always query for peer addresses via DNS lookup (default: %u)"), DEFAULT_FORCEDNSSEED));
     strUsage += HelpMessageOpt("-listen", _("Accept connections from outside (default: 1 if no -proxy or -connect)"));
     strUsage += HelpMessageOpt("-listenonion", strprintf(_("Automatically create Tor hidden service (default: %d)"), DEFAULT_LISTEN_ONION));
     strUsage += HelpMessageOpt("-maxconnections=<n>", strprintf(_("Maintain at most <n> connections to peers (default: %u)"), DEFAULT_MAX_PEER_CONNECTIONS));
-    strUsage += HelpMessageOpt("-maxreceivebuffer=<n>", strprintf(_("Maximum per-connection receive buffer, <n>*1000 bytes (default: %u)"), 5000));
-    strUsage += HelpMessageOpt("-maxsendbuffer=<n>", strprintf(_("Maximum per-connection send buffer, <n>*1000 bytes (default: %u)"), 1000));
+    strUsage += HelpMessageOpt("-maxreceivebuffer=<n>", strprintf(_("Maximum per-connection receive buffer, <n>*1000 bytes (default: %u)"), DEFAULT_MAXRECEIVEBUFFER));
+    strUsage += HelpMessageOpt("-maxsendbuffer=<n>", strprintf(_("Maximum per-connection send buffer, <n>*1000 bytes (default: %u)"), DEFAULT_MAXSENDBUFFER));
     strUsage += HelpMessageOpt("-onion=<ip:port>", strprintf(_("Use separate SOCKS5 proxy to reach peers via Tor hidden services (default: %s)"), "-proxy"));
     strUsage += HelpMessageOpt("-onlynet=<net>", _("Only connect to nodes in network <net> (ipv4, ipv6 or onion)"));
-    strUsage += HelpMessageOpt("-permitbaremultisig", strprintf(_("Relay non-P2SH multisig (default: %u)"), 1));
+    strUsage += HelpMessageOpt("-permitbaremultisig", strprintf(_("Relay non-P2SH multisig (default: %u)"), DEFAULT_PERMIT_BAREMULTISIG));
     strUsage += HelpMessageOpt("-peerbloomfilters", strprintf(_("Support filtering of blocks and transaction with bloom filters (default: %u)"), 1));
     if (showDebug)
         strUsage += HelpMessageOpt("-enforcenodebloom", strprintf("Enforce minimum protocol version to limit use of bloom filters (default: %u)", 0));
-    strUsage += HelpMessageOpt("-port=<port>", strprintf(_("Listen for connections on <port> (default: %u or testnet: %u)"), 8333, 18333));
+    strUsage += HelpMessageOpt("-port=<port>", strprintf(_("Listen for connections on <port> (default: %u or testnet: %u)"), Params(CBaseChainParams::MAIN).GetDefaultPort(), Params(CBaseChainParams::TESTNET).GetDefaultPort()));
     strUsage += HelpMessageOpt("-proxy=<ip:port>", _("Connect through SOCKS5 proxy"));
-    strUsage += HelpMessageOpt("-proxyrandomize", strprintf(_("Randomize credentials for every proxy connection. This enables Tor stream isolation (default: %u)"), 1));
+    strUsage += HelpMessageOpt("-proxyrandomize", strprintf(_("Randomize credentials for every proxy connection. This enables Tor stream isolation (default: %u)"), DEFAULT_PROXYRANDOMIZE));
     strUsage += HelpMessageOpt("-seednode=<ip>", _("Connect to a node to retrieve peer addresses, and disconnect"));
     strUsage += HelpMessageOpt("-timeout=<n>", strprintf(_("Specify connection timeout in milliseconds (minimum: 1, default: %d)"), DEFAULT_CONNECT_TIMEOUT));
     strUsage += HelpMessageOpt("-torcontrol=<ip>:<port>", strprintf(_("Tor control port to use if onion listening enabled (default: %s)"), DEFAULT_TOR_CONTROL));
@@ -388,7 +392,7 @@ std::string HelpMessage(HelpMessageMode mode)
 #ifdef ENABLE_WALLET
     strUsage += HelpMessageGroup(_("Wallet options:"));
     strUsage += HelpMessageOpt("-disablewallet", _("Do not load the wallet and disable wallet RPC calls"));
-    strUsage += HelpMessageOpt("-keypool=<n>", strprintf(_("Set key pool size to <n> (default: %u)"), 100));
+    strUsage += HelpMessageOpt("-keypool=<n>", strprintf(_("Set key pool size to <n> (default: %u)"), DEFAULT_KEYPOOL_SIZE));
     if (showDebug)
         strUsage += HelpMessageOpt("-mintxfee=<amt>", strprintf("Fees (in %s/kB) smaller than this are considered zero fee for transaction creation (default: %s)",
             CURRENCY_UNIT, FormatMoney(DEFAULT_TRANSACTION_MINFEE)));
@@ -396,14 +400,14 @@ std::string HelpMessage(HelpMessageMode mode)
         CURRENCY_UNIT, FormatMoney(payTxFee.GetFeePerK())));
     strUsage += HelpMessageOpt("-rescan", _("Rescan the block chain for missing wallet transactions on startup"));
     strUsage += HelpMessageOpt("-salvagewallet", _("Attempt to recover private keys from a corrupt wallet.dat on startup"));
-    strUsage += HelpMessageOpt("-sendfreetransactions", strprintf(_("Send transactions as zero-fee transactions if possible (default: %u)"), 0));
-    strUsage += HelpMessageOpt("-spendzeroconfchange", strprintf(_("Spend unconfirmed change when sending transactions (default: %u)"), 1));
+    strUsage += HelpMessageOpt("-sendfreetransactions", strprintf(_("Send transactions as zero-fee transactions if possible (default: %u)"), DEFAULT_SEND_FREE_TRANSACTIONS));
+    strUsage += HelpMessageOpt("-spendzeroconfchange", strprintf(_("Spend unconfirmed change when sending transactions (default: %u)"), DEFAULT_SPEND_ZEROCONF_CHANGE));
     strUsage += HelpMessageOpt("-txconfirmtarget=<n>", strprintf(_("If paytxfee is not set, include enough fee so transactions begin confirmation on average within n blocks (default: %u)"), DEFAULT_TX_CONFIRM_TARGET));
     strUsage += HelpMessageOpt("-maxtxfee=<amt>", strprintf(_("Maximum total fees (in %s) to use in a single wallet transaction; setting this too low may abort large transactions (default: %s)"),
         CURRENCY_UNIT, FormatMoney(DEFAULT_TRANSACTION_MAXFEE)));
     strUsage += HelpMessageOpt("-upgradewallet", _("Upgrade wallet to latest format on startup"));
     strUsage += HelpMessageOpt("-wallet=<file>", _("Specify wallet file (within data directory)") + " " + strprintf(_("(default: %s)"), "wallet.dat"));
-    strUsage += HelpMessageOpt("-walletbroadcast", _("Make the wallet broadcast transactions") + " " + strprintf(_("(default: %u)"), true));
+    strUsage += HelpMessageOpt("-walletbroadcast", _("Make the wallet broadcast transactions") + " " + strprintf(_("(default: %u)"), DEFAULT_WALLETBROADCAST));
     strUsage += HelpMessageOpt("-walletnotify=<cmd>", _("Execute command when a wallet transaction changes (%s in cmd is replaced by TxID)"));
     strUsage += HelpMessageOpt("-zapwallettxes=<mode>", _("Delete all wallet transactions and only recover those parts of the blockchain through -rescan on startup") +
         " " + _("(1 = keep tx meta data e.g. account owner and payment request information, 2 = drop tx meta data)"));
@@ -420,18 +424,18 @@ std::string HelpMessage(HelpMessageMode mode)
     strUsage += HelpMessageGroup(_("Debugging/Testing options:"));
     if (showDebug)
     {
-        strUsage += HelpMessageOpt("-checkpoints", strprintf("Disable expensive verification for known chain history (default: %u)", 1));
+        strUsage += HelpMessageOpt("-checkpoints", strprintf("Disable expensive verification for known chain history (default: %u)", DEFAULT_CHECKPOINTS_ENABLED));
 #ifdef ENABLE_WALLET
         strUsage += HelpMessageOpt("-dblogsize=<n>", strprintf("Flush wallet database activity from memory to disk log every <n> megabytes (default: %u)", DEFAULT_WALLET_DBLOGSIZE));
 #endif
-        strUsage += HelpMessageOpt("-disablesafemode", strprintf("Disable safemode, override a real safe mode event (default: %u)", 0));
-        strUsage += HelpMessageOpt("-testsafemode", strprintf("Force safe mode (default: %u)", 0));
+        strUsage += HelpMessageOpt("-disablesafemode", strprintf("Disable safemode, override a real safe mode event (default: %u)", DEFAULT_DISABLE_SAFEMODE));
+        strUsage += HelpMessageOpt("-testsafemode", strprintf("Force safe mode (default: %u)", DEFAULT_TESTSAFEMODE));
         strUsage += HelpMessageOpt("-dropmessagestest=<n>", "Randomly drop 1 of every <n> network messages");
         strUsage += HelpMessageOpt("-fuzzmessagestest=<n>", "Randomly fuzz 1 of every <n> network messages");
 #ifdef ENABLE_WALLET
-        strUsage += HelpMessageOpt("-flushwallet", strprintf("Run a thread to flush wallet periodically (default: %u)", 1));
+        strUsage += HelpMessageOpt("-flushwallet", strprintf("Run a thread to flush wallet periodically (default: %u)", DEFAULT_FLUSHWALLET));
 #endif
-        strUsage += HelpMessageOpt("-stopafterblockimport", strprintf("Stop running after importing blocks from disk (default: %u)", 0));
+        strUsage += HelpMessageOpt("-stopafterblockimport", strprintf("Stop running after importing blocks from disk (default: %u)", DEFAULT_STOPAFTERBLOCKIMPORT));
         strUsage += HelpMessageOpt("-limitancestorcount=<n>", strprintf("Do not accept transactions if number of in-mempool ancestors is <n> or more (default: %u)", DEFAULT_ANCESTOR_LIMIT));
         strUsage += HelpMessageOpt("-limitancestorsize=<n>", strprintf("Do not accept transactions whose size with all in-mempool ancestors exceeds <n> kilobytes (default: %u)", DEFAULT_ANCESTOR_SIZE_LIMIT));
         strUsage += HelpMessageOpt("-limitdescendantcount=<n>", strprintf("Do not accept transactions if any ancestor would have <n> or more in-mempool descendants (default: %u)", DEFAULT_DESCENDANT_LIMIT));
@@ -442,16 +446,16 @@ std::string HelpMessage(HelpMessageMode mode)
         debugCategories += ", qt";
     strUsage += HelpMessageOpt("-debug=<category>", strprintf(_("Output debugging information (default: %u, supplying <category> is optional)"), 0) + ". " +
         _("If <category> is not supplied or if <category> = 1, output all debugging information.") + _("<category> can be:") + " " + debugCategories + ".");
-    strUsage += HelpMessageOpt("-gen", strprintf(_("Generate coins (default: %u)"), 0));
+    strUsage += HelpMessageOpt("-gen", strprintf(_("Generate coins (default: %u)"), DEFAULT_GENERATE));
     strUsage += HelpMessageOpt("-genproclimit=<n>", strprintf(_("Set the number of threads for coin generation if enabled (-1 = all cores, default: %d)"), DEFAULT_GENERATE_THREADS));
     strUsage += HelpMessageOpt("-help-debug", _("Show all debugging options (usage: --help -help-debug)"));
-    strUsage += HelpMessageOpt("-logips", strprintf(_("Include IP addresses in debug output (default: %u)"), 0));
-    strUsage += HelpMessageOpt("-logtimestamps", strprintf(_("Prepend debug output with timestamp (default: %u)"), 1));
+    strUsage += HelpMessageOpt("-logips", strprintf(_("Include IP addresses in debug output (default: %u)"), DEFAULT_LOGIPS));
+    strUsage += HelpMessageOpt("-logtimestamps", strprintf(_("Prepend debug output with timestamp (default: %u)"), DEFAULT_LOGTIMESTAMPS));
     if (showDebug)
     {
         strUsage += HelpMessageOpt("-logtimemicros", strprintf("Add microsecond precision to debug timestamps (default: %u)", DEFAULT_LOGTIMEMICROS));
-        strUsage += HelpMessageOpt("-limitfreerelay=<n>", strprintf("Continuously rate-limit free transactions to <n>*1000 bytes per minute (default: %u)", 15));
-        strUsage += HelpMessageOpt("-relaypriority", strprintf("Require high priority for relaying free or low-fee transactions (default: %u)", 1));
+        strUsage += HelpMessageOpt("-limitfreerelay=<n>", strprintf("Continuously rate-limit free transactions to <n>*1000 bytes per minute (default: %u)", DEFAULT_LIMITFREERELAY));
+        strUsage += HelpMessageOpt("-relaypriority", strprintf("Require high priority for relaying free or low-fee transactions (default: %u)", DEFAULT_RELAYPRIORITY));
         strUsage += HelpMessageOpt("-maxsigcachesize=<n>", strprintf("Limit size of signature cache to <n> MiB (default: %u)", DEFAULT_MAX_SIG_CACHE_SIZE));
     }
     strUsage += HelpMessageOpt("-minrelaytxfee=<amt>", strprintf(_("Fees (in %s/kB) smaller than this are considered zero fee for relaying, mining and transaction creation (default: %s)"),
@@ -459,8 +463,10 @@ std::string HelpMessage(HelpMessageMode mode)
     strUsage += HelpMessageOpt("-printtoconsole", _("Send trace/debug info to console instead of debug.log file"));
     if (showDebug)
     {
-        strUsage += HelpMessageOpt("-printpriority", strprintf("Log transaction priority and fee per kB when mining blocks (default: %u)", 0));
-        strUsage += HelpMessageOpt("-privdb", strprintf("Sets the DB_PRIVATE flag in the wallet db environment (default: %u)", 1));
+        strUsage += HelpMessageOpt("-printpriority", strprintf("Log transaction priority and fee per kB when mining blocks (default: %u)", DEFAULT_PRINTPRIORITY));
+#ifdef ENABLE_WALLET
+        strUsage += HelpMessageOpt("-privdb", strprintf("Sets the DB_PRIVATE flag in the wallet db environment (default: %u)", DEFAULT_WALLET_PRIVDB));
+#endif
     }
     strUsage += HelpMessageOpt("-shrinkdebugfile", _("Shrink debug.log file on client startup (default: 1 when no -debug)"));
 
@@ -469,11 +475,11 @@ std::string HelpMessage(HelpMessageMode mode)
     strUsage += HelpMessageGroup(_("Node relay options:"));
     if (showDebug)
         strUsage += HelpMessageOpt("-acceptnonstdtxn", strprintf("Relay and mine \"non-standard\" transactions (%sdefault: %u)", "testnet/regtest only; ", !Params(CBaseChainParams::TESTNET).RequireStandard()));
-    strUsage += HelpMessageOpt("-datacarrier", strprintf(_("Relay and mine data carrier transactions (default: %u)"), 1));
+    strUsage += HelpMessageOpt("-datacarrier", strprintf(_("Relay and mine data carrier transactions (default: %u)"), DEFAULT_ACCEPT_DATACARRIER));
     strUsage += HelpMessageOpt("-datacarriersize", strprintf(_("Maximum size of data in data carrier transactions we relay and mine (default: %u)"), MAX_OP_RETURN_RELAY));
 
     strUsage += HelpMessageGroup(_("Block creation options:"));
-    strUsage += HelpMessageOpt("-blockminsize=<n>", strprintf(_("Set minimum block size in bytes (default: %u)"), 0));
+    strUsage += HelpMessageOpt("-blockminsize=<n>", strprintf(_("Set minimum block size in bytes (default: %u)"), DEFAULT_BLOCK_MIN_SIZE));
     strUsage += HelpMessageOpt("-blockmaxsize=<n>", strprintf(_("Set maximum block size in bytes (default: %d)"), DEFAULT_BLOCK_MAX_SIZE));
     strUsage += HelpMessageOpt("-blockprioritysize=<n>", strprintf(_("Set maximum size of high-priority/low-fee transactions in bytes (default: %d)"), DEFAULT_BLOCK_PRIORITY_SIZE));
     if (showDebug)
@@ -481,7 +487,7 @@ std::string HelpMessage(HelpMessageMode mode)
 
     strUsage += HelpMessageGroup(_("RPC server options:"));
     strUsage += HelpMessageOpt("-server", _("Accept command line and JSON-RPC commands"));
-    strUsage += HelpMessageOpt("-rest", strprintf(_("Accept public REST requests (default: %u)"), 0));
+    strUsage += HelpMessageOpt("-rest", strprintf(_("Accept public REST requests (default: %u)"), DEFAULT_REST_ENABLE));
     strUsage += HelpMessageOpt("-rpcbind=<addr>", _("Bind to given address to listen for JSON-RPC connections. Use [host]:port notation for IPv6. This option can be specified multiple times (default: bind to all interfaces)"));
     strUsage += HelpMessageOpt("-rpcuser=<user>", _("Username for JSON-RPC connections"));
     strUsage += HelpMessageOpt("-rpcpassword=<pw>", _("Password for JSON-RPC connections"));
@@ -493,23 +499,6 @@ std::string HelpMessage(HelpMessageMode mode)
         strUsage += HelpMessageOpt("-rpcservertimeout=<n>", strprintf("Timeout during HTTP requests (default: %d)", DEFAULT_HTTP_SERVER_TIMEOUT));
     }
 
-    if (mode == HMM_BITCOIN_QT)
-    {
-        strUsage += HelpMessageGroup(_("UI Options:"));
-        if (showDebug) {
-            strUsage += HelpMessageOpt("-allowselfsignedrootcertificates", "Allow self signed root certificates (default: 0)");
-        }
-        strUsage += HelpMessageOpt("-choosedatadir", _("Choose data directory on startup (default: 0)"));
-        strUsage += HelpMessageOpt("-lang=<lang>", _("Set language, for example \"de_DE\" (default: system locale)"));
-        strUsage += HelpMessageOpt("-min", _("Start minimized"));
-        strUsage += HelpMessageOpt("-rootcertificates=<file>", _("Set SSL root certificates for payment request (default: -system-)"));
-        strUsage += HelpMessageOpt("-splash", _("Show splash screen on startup (default: 1)"));
-        strUsage += HelpMessageOpt("-resetguisettings", _("Reset all settings changes made over the GUI"));
-        if (showDebug) {
-            strUsage += HelpMessageOpt("-uiplatform", "Select platform to customize UI for (one of windows, macosx, other; default: platform compiled on)");
-        }
-    }
-
     return strUsage;
 }
 
@@ -643,7 +632,7 @@ void ThreadImport(std::vector<boost::filesystem::path> vImportFiles)
         }
     }
 
-    if (GetBoolArg("-stopafterblockimport", false)) {
+    if (GetBoolArg("-stopafterblockimport", DEFAULT_STOPAFTERBLOCKIMPORT)) {
         LogPrintf("Stopping after block import\n");
         StartShutdown();
     }
@@ -675,7 +664,7 @@ bool AppInitServers(boost::thread_group& threadGroup)
         return false;
     if (!StartHTTPRPC())
         return false;
-    if (GetBoolArg("-rest", false) && !StartREST())
+    if (GetBoolArg("-rest", DEFAULT_REST_ENABLE) && !StartREST())
         return false;
     if (!StartHTTPServer())
         return false;
@@ -759,9 +748,9 @@ void InitParameterInteraction()
 void InitLogging()
 {
     fPrintToConsole = GetBoolArg("-printtoconsole", false);
-    fLogTimestamps = GetBoolArg("-logtimestamps", true);
+    fLogTimestamps = GetBoolArg("-logtimestamps", DEFAULT_LOGTIMESTAMPS);
     fLogTimeMicros = GetBoolArg("-logtimemicros", DEFAULT_LOGTIMEMICROS);
-    fLogIPs = GetBoolArg("-logips", false);
+    fLogIPs = GetBoolArg("-logips", DEFAULT_LOGIPS);
 
     LogPrintf("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
     LogPrintf("Bitcoin version %s (%s)\n", FormatFullVersion(), CLIENT_DATE);
@@ -835,7 +824,7 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
 
     // if using block pruning, then disable txindex
     if (GetArg("-prune", 0)) {
-        if (GetBoolArg("-txindex", false))
+        if (GetBoolArg("-txindex", DEFAULT_TXINDEX))
             return InitError(_("Prune mode is incompatible with -txindex."));
 #ifdef ENABLE_WALLET
         if (GetBoolArg("-rescan", false)) {
@@ -896,7 +885,7 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
         mempool.setSanityCheck(1.0 / ratio);
     }
     fCheckBlockIndex = GetBoolArg("-checkblockindex", chainparams.DefaultConsistencyChecks());
-    fCheckpointsEnabled = GetBoolArg("-checkpoints", true);
+    fCheckpointsEnabled = GetBoolArg("-checkpoints", DEFAULT_CHECKPOINTS_ENABLED);
 
     // mempool limits
     int64_t nMempoolSizeMax = GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000;
@@ -994,13 +983,14 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
         }
     }
     nTxConfirmTarget = GetArg("-txconfirmtarget", DEFAULT_TX_CONFIRM_TARGET);
-    bSpendZeroConfChange = GetBoolArg("-spendzeroconfchange", true);
-    fSendFreeTransactions = GetBoolArg("-sendfreetransactions", false);
+    bSpendZeroConfChange = GetBoolArg("-spendzeroconfchange", DEFAULT_SPEND_ZEROCONF_CHANGE);
+    fSendFreeTransactions = GetBoolArg("-sendfreetransactions", DEFAULT_SEND_FREE_TRANSACTIONS);
 
     std::string strWalletFile = GetArg("-wallet", "wallet.dat");
 #endif // ENABLE_WALLET
 
-    fIsBareMultisigStd = GetBoolArg("-permitbaremultisig", true);
+    fIsBareMultisigStd = GetBoolArg("-permitbaremultisig", DEFAULT_PERMIT_BAREMULTISIG);
+    fAcceptDatacarrier = GetBoolArg("-datacarrier", DEFAULT_ACCEPT_DATACARRIER);
     nMaxDatacarrierBytes = GetArg("-datacarriersize", nMaxDatacarrierBytes);
 
     fAlerts = GetBoolArg("-alerts", DEFAULT_ALERTS);
@@ -1151,7 +1141,7 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
         }
     }
 
-    bool proxyRandomize = GetBoolArg("-proxyrandomize", true);
+    bool proxyRandomize = GetBoolArg("-proxyrandomize", DEFAULT_PROXYRANDOMIZE);
     // -proxy sets a proxy for all outgoing network traffic
     // -noproxy (or -proxy=0) as well as the empty string can be used to not set a proxy, this is the default
     std::string proxyArg = GetArg("-proxy", "");
@@ -1186,7 +1176,7 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
     // see Step 2: parameter interactions for more information about these
     fListen = GetBoolArg("-listen", DEFAULT_LISTEN);
     fDiscover = GetBoolArg("-discover", true);
-    fNameLookup = GetBoolArg("-dns", true);
+    fNameLookup = GetBoolArg("-dns", DEFAULT_NAME_LOOKUP);
 
     bool fBound = false;
     if (fListen) {
@@ -1275,7 +1265,7 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
     nTotalCache = std::max(nTotalCache, nMinDbCache << 20); // total cache cannot be less than nMinDbCache
     nTotalCache = std::min(nTotalCache, nMaxDbCache << 20); // total cache cannot be greated than nMaxDbcache
     int64_t nBlockTreeDBCache = nTotalCache / 8;
-    if (nBlockTreeDBCache > (1 << 21) && !GetBoolArg("-txindex", false))
+    if (nBlockTreeDBCache > (1 << 21) && !GetBoolArg("-txindex", DEFAULT_TXINDEX))
         nBlockTreeDBCache = (1 << 21); // block tree db cache shouldn't be larger than 2 MiB
     nTotalCache -= nBlockTreeDBCache;
     int64_t nCoinDBCache = std::min(nTotalCache / 2, (nTotalCache / 4) + (1 << 23)); // use 25%-50% of the remainder for disk cache
@@ -1331,7 +1321,7 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
                 }
 
                 // Check for changed -txindex state
-                if (fTxIndex != GetBoolArg("-txindex", false)) {
+                if (fTxIndex != GetBoolArg("-txindex", DEFAULT_TXINDEX)) {
                     strLoadError = _("You need to rebuild the database using -reindex to change -txindex");
                     break;
                 }
@@ -1557,7 +1547,7 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
                 }
             }
         }
-        pwalletMain->SetBroadcastTransactions(GetBoolArg("-walletbroadcast", true));
+        pwalletMain->SetBroadcastTransactions(GetBoolArg("-walletbroadcast", DEFAULT_WALLETBROADCAST));
     } // (!fDisableWallet)
 #else // ENABLE_WALLET
     LogPrintf("No wallet support compiled in!\n");
@@ -1631,7 +1621,7 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
     scheduler.scheduleEvery(f, nPowTargetSpacing);
 
     // Generate coins in the background
-    GenerateBitcoins(GetBoolArg("-gen", false), GetArg("-genproclimit", DEFAULT_GENERATE_THREADS), chainparams);
+    GenerateBitcoins(GetBoolArg("-gen", DEFAULT_GENERATE), GetArg("-genproclimit", DEFAULT_GENERATE_THREADS), chainparams);
 
     // ********************************************************* Step 12: finished
 
diff --git a/src/main.cpp b/src/main.cpp
index ceb5cb66f3..6b6840ce8c 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -66,10 +66,10 @@ bool fReindex = false;
 bool fTxIndex = false;
 bool fHavePruned = false;
 bool fPruneMode = false;
-bool fIsBareMultisigStd = true;
+bool fIsBareMultisigStd = DEFAULT_PERMIT_BAREMULTISIG;
 bool fRequireStandard = true;
 bool fCheckBlockIndex = false;
-bool fCheckpointsEnabled = true;
+bool fCheckpointsEnabled = DEFAULT_CHECKPOINTS_ENABLED;
 size_t nCoinCacheUsage = 5000 * 300;
 uint64_t nPruneTarget = 0;
 bool fAlerts = DEFAULT_ALERTS;
@@ -941,7 +941,7 @@ bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransa
         CAmount mempoolRejectFee = pool.GetMinFee(GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFee(nSize);
         if (mempoolRejectFee > 0 && nFees < mempoolRejectFee) {
             return state.DoS(0, false, REJECT_INSUFFICIENTFEE, "mempool min fee not met", false, strprintf("%d < %d", nFees, mempoolRejectFee));
-        } else if (GetBoolArg("-relaypriority", true) && nFees < ::minRelayTxFee.GetFee(nSize) && !AllowFree(view.GetPriority(tx, chainActive.Height() + 1))) {
+        } else if (GetBoolArg("-relaypriority", DEFAULT_RELAYPRIORITY) && nFees < ::minRelayTxFee.GetFee(nSize) && !AllowFree(view.GetPriority(tx, chainActive.Height() + 1))) {
             // Require that free transactions have sufficient priority to be mined in the next block.
             return state.DoS(0, false, REJECT_INSUFFICIENTFEE, "insufficient priority");
         }
@@ -963,7 +963,7 @@ bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransa
             nLastTime = nNow;
             // -limitfreerelay unit is thousand-bytes-per-minute
             // At default rate it would take over a month to fill 1GB
-            if (dFreeCount >= GetArg("-limitfreerelay", 15)*10*1000)
+            if (dFreeCount >= GetArg("-limitfreerelay", DEFAULT_LIMITFREERELAY) * 10 * 1000)
                 return state.DoS(0, false, REJECT_INSUFFICIENTFEE, "rate limited free transaction");
             LogPrint("mempool", "Rate limit dFreeCount: %g => %g\n", dFreeCount, dFreeCount+nSize);
             dFreeCount += nSize;
@@ -1436,7 +1436,7 @@ void Misbehaving(NodeId pnode, int howmuch)
         return;
 
     state->nMisbehavior += howmuch;
-    int banscore = GetArg("-banscore", 100);
+    int banscore = GetArg("-banscore", DEFAULT_BANSCORE_THRESHOLD);
     if (state->nMisbehavior >= banscore && state->nMisbehavior - howmuch < banscore)
     {
         LogPrintf("%s: %s (%d -> %d) BAN THRESHOLD EXCEEDED\n", __func__, state->name, state->nMisbehavior-howmuch, state->nMisbehavior);
@@ -3605,7 +3605,7 @@ bool InitBlockIndex(const CChainParams& chainparams)
         return true;
 
     // Use the provided setting for -txindex in the new database
-    fTxIndex = GetBoolArg("-txindex", false);
+    fTxIndex = GetBoolArg("-txindex", DEFAULT_TXINDEX);
     pblocktree->WriteFlag("txindex", fTxIndex);
     LogPrintf("Initializing databases...\n");
 
@@ -3936,7 +3936,7 @@ std::string GetWarnings(const std::string& strFor)
     if (!CLIENT_VERSION_IS_RELEASE)
         strStatusBar = _("This is a pre-release test build - use at your own risk - do not use for mining or merchant applications");
 
-    if (GetBoolArg("-testsafemode", false))
+    if (GetBoolArg("-testsafemode", DEFAULT_TESTSAFEMODE))
         strStatusBar = strRPC = "testsafemode enabled";
 
     // Misc warnings like out of disk space and clock is wrong
diff --git a/src/main.h b/src/main.h
index f738e3eb57..dfa2fcb537 100644
--- a/src/main.h
+++ b/src/main.h
@@ -64,6 +64,7 @@ static const unsigned int MAX_BLOCKFILE_SIZE = 0x8000000; // 128 MiB
 static const unsigned int BLOCKFILE_CHUNK_SIZE = 0x1000000; // 16 MiB
 /** The pre-allocation chunk size for rev?????.dat files (since 0.8) */
 static const unsigned int UNDOFILE_CHUNK_SIZE = 0x100000; // 1 MiB
+
 /** Maximum number of script-checking threads allowed */
 static const int MAX_SCRIPTCHECK_THREADS = 16;
 /** -par default (number of script-checking threads, 0 = auto) */
@@ -86,6 +87,16 @@ static const unsigned int DATABASE_WRITE_INTERVAL = 60 * 60;
 static const unsigned int DATABASE_FLUSH_INTERVAL = 24 * 60 * 60;
 /** Maximum length of reject messages. */
 static const unsigned int MAX_REJECT_MESSAGE_LENGTH = 111;
+static const unsigned int DEFAULT_LIMITFREERELAY = 15;
+static const bool DEFAULT_RELAYPRIORITY = true;
+
+/** Default for -permitbaremultisig */
+static const bool DEFAULT_PERMIT_BAREMULTISIG = true;
+static const bool DEFAULT_CHECKPOINTS_ENABLED = true;
+static const bool DEFAULT_TXINDEX = false;
+static const unsigned int DEFAULT_BANSCORE_THRESHOLD = 100;
+
+static const bool DEFAULT_TESTSAFEMODE = false;
 
 struct BlockHasher
 {
diff --git a/src/miner.cpp b/src/miner.cpp
index bb6b513372..5b711210db 100644
--- a/src/miner.cpp
+++ b/src/miner.cpp
@@ -153,7 +153,7 @@ CBlockTemplate* CreateNewBlock(const CChainParams& chainparams, const CScript& s
         // Priority order to process transactions
         list<COrphan> vOrphan; // list memory doesn't move
         map<uint256, vector<COrphan*> > mapDependers;
-        bool fPrintPriority = GetBoolArg("-printpriority", false);
+        bool fPrintPriority = GetBoolArg("-printpriority", DEFAULT_PRINTPRIORITY);
 
         // This vector will be sorted into a priority queue:
         vector<TxPriority> vecPriority;
diff --git a/src/miner.h b/src/miner.h
index 7b544303e0..16c8e2a976 100644
--- a/src/miner.h
+++ b/src/miner.h
@@ -17,8 +17,11 @@ class CScript;
 class CWallet;
 namespace Consensus { struct Params; };
 
+static const bool DEFAULT_GENERATE = false;
 static const int DEFAULT_GENERATE_THREADS = 1;
 
+static const bool DEFAULT_PRINTPRIORITY = false;
+
 struct CBlockTemplate
 {
     CBlock block;
diff --git a/src/net.cpp b/src/net.cpp
index cff4c54505..abc7cbb8f4 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -521,12 +521,11 @@ void CNode::Ban(const CSubNet& subNet, const BanReason &banReason, int64_t banti
     banEntry.banReason = banReason;
     if (bantimeoffset <= 0)
     {
-        bantimeoffset = GetArg("-bantime", 60*60*24); // Default 24-hour ban
+        bantimeoffset = GetArg("-bantime", DEFAULT_MISBEHAVING_BANTIME);
         sinceUnixEpoch = false;
     }
     banEntry.nBanUntil = (sinceUnixEpoch ? 0 : GetTime() )+bantimeoffset;
 
-
     LOCK(cs_setBanned);
     if (setBanned[subNet].nBanUntil < banEntry.nBanUntil)
         setBanned[subNet] = banEntry;
@@ -1414,7 +1413,7 @@ void ThreadDNSAddressSeed()
 {
     // goal: only query DNS seeds if address need is acute
     if ((addrman.size() > 0) &&
-        (!GetBoolArg("-forcednsseed", false))) {
+        (!GetBoolArg("-forcednsseed", DEFAULT_FORCEDNSSEED))) {
         MilliSleep(11 * 1000);
 
         LOCK(cs_vNodes);
@@ -2337,8 +2336,8 @@ bool CAddrDB::Read(CAddrMan& addr)
     return true;
 }
 
-unsigned int ReceiveFloodSize() { return 1000*GetArg("-maxreceivebuffer", 5*1000); }
-unsigned int SendBufferSize() { return 1000*GetArg("-maxsendbuffer", 1*1000); }
+unsigned int ReceiveFloodSize() { return 1000*GetArg("-maxreceivebuffer", DEFAULT_MAXRECEIVEBUFFER); }
+unsigned int SendBufferSize() { return 1000*GetArg("-maxsendbuffer", DEFAULT_MAXSENDBUFFER); }
 
 CNode::CNode(SOCKET hSocketIn, const CAddress& addrIn, const std::string& addrNameIn, bool fInboundIn) :
     ssSend(SER_NETWORK, INIT_PROTO_VERSION),
diff --git a/src/net.h b/src/net.h
index 559cdf0878..3664ce9a70 100644
--- a/src/net.h
+++ b/src/net.h
@@ -65,6 +65,13 @@ static const uint64_t DEFAULT_MAX_UPLOAD_TARGET = 0;
 /** Default for blocks only*/
 static const bool DEFAULT_BLOCKSONLY = false;
 
+static const bool DEFAULT_FORCEDNSSEED = false;
+static const size_t DEFAULT_MAXRECEIVEBUFFER = 5 * 1000;
+static const size_t DEFAULT_MAXSENDBUFFER    = 1 * 1000;
+
+// NOTE: When adjusting this, update rpcnet:setban's help ("24h")
+static const unsigned int DEFAULT_MISBEHAVING_BANTIME = 60 * 60 * 24;  // Default 24-hour ban
+
 unsigned int ReceiveFloodSize();
 unsigned int SendBufferSize();
 
diff --git a/src/netbase.cpp b/src/netbase.cpp
index 83cedfb620..05214cb026 100644
--- a/src/netbase.cpp
+++ b/src/netbase.cpp
@@ -40,7 +40,7 @@ static proxyType proxyInfo[NET_MAX];
 static proxyType nameProxy;
 static CCriticalSection cs_proxyInfos;
 int nConnectTimeout = DEFAULT_CONNECT_TIMEOUT;
-bool fNameLookup = false;
+bool fNameLookup = DEFAULT_NAME_LOOKUP;
 
 static const unsigned char pchIPv4[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff };
 
diff --git a/src/netbase.h b/src/netbase.h
index 2a79f82d72..9c2df0338e 100644
--- a/src/netbase.h
+++ b/src/netbase.h
@@ -19,8 +19,10 @@
 extern int nConnectTimeout;
 extern bool fNameLookup;
 
-/** -timeout default */
+//! -timeout default
 static const int DEFAULT_CONNECT_TIMEOUT = 5000;
+//! -dns default
+static const int DEFAULT_NAME_LOOKUP = true;
 
 #ifdef WIN32
 // In MSVC, this is defined as a macro, undefine it to prevent a compile and link error
diff --git a/src/policy/policy.cpp b/src/policy/policy.cpp
index 4c96fbf5a5..46c7f18942 100644
--- a/src/policy/policy.cpp
+++ b/src/policy/policy.cpp
@@ -50,7 +50,7 @@ bool IsStandard(const CScript& scriptPubKey, txnouttype& whichType)
         if (m < 1 || m > n)
             return false;
     } else if (whichType == TX_NULL_DATA &&
-               (!GetBoolArg("-datacarrier", true) || scriptPubKey.size() > nMaxDatacarrierBytes))
+               (!fAcceptDatacarrier || scriptPubKey.size() > nMaxDatacarrierBytes))
           return false;
 
     return whichType != TX_NONSTANDARD;
diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
index d407e539ef..1fa5ef5f5d 100644
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -660,7 +660,7 @@ int main(int argc, char *argv[])
     // Subscribe to global signals from core
     uiInterface.InitMessage.connect(InitMessage);
 
-    if (GetBoolArg("-splash", true) && !GetBoolArg("-min", false))
+    if (GetBoolArg("-splash", DEFAULT_SPLASHSCREEN) && !GetBoolArg("-min", false))
         app.createSplashScreen(networkStyle.data());
 
     try
diff --git a/src/qt/guiconstants.h b/src/qt/guiconstants.h
index 7d3e48ff32..216f23f139 100644
--- a/src/qt/guiconstants.h
+++ b/src/qt/guiconstants.h
@@ -14,6 +14,8 @@ static const int MAX_PASSPHRASE_SIZE = 1024;
 /* BitcoinGUI -- Size of icons in status bar */
 static const int STATUSBAR_ICONSIZE = 16;
 
+static const bool DEFAULT_SPLASHSCREEN = true;
+
 /* Invalid field background style */
 #define STYLE_INVALID "background:#FF8080"
 
diff --git a/src/qt/intro.cpp b/src/qt/intro.cpp
index 4ab87e0f32..ab63e98d40 100644
--- a/src/qt/intro.cpp
+++ b/src/qt/intro.cpp
@@ -162,7 +162,7 @@ void Intro::pickDataDirectory()
     /* 2) Allow QSettings to override default dir */
     dataDir = settings.value("strDataDir", dataDir).toString();
 
-    if(!fs::exists(GUIUtil::qstringToBoostPath(dataDir)) || GetBoolArg("-choosedatadir", false))
+    if(!fs::exists(GUIUtil::qstringToBoostPath(dataDir)) || GetBoolArg("-choosedatadir", DEFAULT_CHOOSE_DATADIR))
     {
         /* If current default data directory does not exist, let the user choose one */
         Intro intro;
diff --git a/src/qt/intro.h b/src/qt/intro.h
index 50783f7225..1d49922e93 100644
--- a/src/qt/intro.h
+++ b/src/qt/intro.h
@@ -9,6 +9,8 @@
 #include <QMutex>
 #include <QThread>
 
+static const bool DEFAULT_CHOOSE_DATADIR = false;
+
 class FreespaceChecker;
 
 namespace Ui {
diff --git a/src/qt/paymentrequestplus.cpp b/src/qt/paymentrequestplus.cpp
index 78a783dea4..1f54c62b6e 100644
--- a/src/qt/paymentrequestplus.cpp
+++ b/src/qt/paymentrequestplus.cpp
@@ -145,7 +145,7 @@ bool PaymentRequestPlus::getMerchant(X509_STORE* certStore, QString& merchant) c
             int error = X509_STORE_CTX_get_error(store_ctx);
             // For testing payment requests, we allow self signed root certs!
             // This option is just shown in the UI options, if -help-debug is enabled.
-            if (!(error == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT && GetBoolArg("-allowselfsignedrootcertificates", false))) {
+            if (!(error == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT && GetBoolArg("-allowselfsignedrootcertificates", DEFAULT_SELFSIGNED_ROOTCERTS))) {
                 throw SSLVerifyError(X509_verify_cert_error_string(error));
             } else {
                qDebug() << "PaymentRequestPlus::getMerchant: Allowing self signed root certificate, because -allowselfsignedrootcertificates is true.";
diff --git a/src/qt/paymentrequestplus.h b/src/qt/paymentrequestplus.h
index 99a7186b85..8a7c4c0623 100644
--- a/src/qt/paymentrequestplus.h
+++ b/src/qt/paymentrequestplus.h
@@ -15,6 +15,8 @@
 #include <QList>
 #include <QString>
 
+static const bool DEFAULT_SELFSIGNED_ROOTCERTS = false;
+
 //
 // Wraps dumb protocol buffer paymentRequest
 // with extra methods
diff --git a/src/qt/utilitydialog.cpp b/src/qt/utilitydialog.cpp
index 5e26f3e01b..da85ab2b30 100644
--- a/src/qt/utilitydialog.cpp
+++ b/src/qt/utilitydialog.cpp
@@ -8,6 +8,9 @@
 
 #include "bitcoingui.h"
 #include "clientmodel.h"
+#include "guiconstants.h"
+#include "intro.h"
+#include "paymentrequestplus.h"
 #include "guiutil.h"
 
 #include "clientversion.h"
@@ -70,7 +73,22 @@ HelpMessageDialog::HelpMessageDialog(QWidget *parent, bool about) :
         cursor.insertText(header);
         cursor.insertBlock();
 
-        QString coreOptions = QString::fromStdString(HelpMessage(HMM_BITCOIN_QT));
+        std::string strUsage = HelpMessage(HMM_BITCOIN_QT);
+        const bool showDebug = GetBoolArg("-help-debug", false);
+        strUsage += HelpMessageGroup(_("UI Options:"));
+        if (showDebug) {
+            strUsage += HelpMessageOpt("-allowselfsignedrootcertificates", strprintf("Allow self signed root certificates (default: %u)", DEFAULT_SELFSIGNED_ROOTCERTS));
+        }
+        strUsage += HelpMessageOpt("-choosedatadir", strprintf(_("Choose data directory on startup (default: %u)"), DEFAULT_CHOOSE_DATADIR));
+        strUsage += HelpMessageOpt("-lang=<lang>", _("Set language, for example \"de_DE\" (default: system locale)"));
+        strUsage += HelpMessageOpt("-min", _("Start minimized"));
+        strUsage += HelpMessageOpt("-rootcertificates=<file>", _("Set SSL root certificates for payment request (default: -system-)"));
+        strUsage += HelpMessageOpt("-splash", strprintf(_("Show splash screen on startup (default: %u)"), DEFAULT_SPLASHSCREEN));
+        strUsage += HelpMessageOpt("-resetguisettings", _("Reset all settings changes made over the GUI"));
+        if (showDebug) {
+            strUsage += HelpMessageOpt("-uiplatform", "Select platform to customize UI for (one of windows, macosx, other; default: platform compiled on)");
+        }
+        QString coreOptions = QString::fromStdString(strUsage);
         text = version + "\n" + header + "\n" + coreOptions;
 
         QTextTableFormat tf;
diff --git a/src/rpcmining.cpp b/src/rpcmining.cpp
index 19b031b860..c8649ec27d 100644
--- a/src/rpcmining.cpp
+++ b/src/rpcmining.cpp
@@ -99,7 +99,7 @@ UniValue getgenerate(const UniValue& params, bool fHelp)
         throw runtime_error(
             "getgenerate\n"
             "\nReturn if the server is set to generate coins or not. The default is false.\n"
-            "It is set with the command line argument -gen (or bitcoin.conf setting gen)\n"
+            "It is set with the command line argument -gen (or " + std::string(BITCOIN_CONF_FILENAME) + " setting gen)\n"
             "It can also be set with the setgenerate call.\n"
             "\nResult\n"
             "true|false      (boolean) If the server is set to generate coins or not\n"
@@ -109,7 +109,7 @@ UniValue getgenerate(const UniValue& params, bool fHelp)
         );
 
     LOCK(cs_main);
-    return GetBoolArg("-gen", false);
+    return GetBoolArg("-gen", DEFAULT_GENERATE);
 }
 
 UniValue generate(const UniValue& params, bool fHelp)
diff --git a/src/script/standard.cpp b/src/script/standard.cpp
index bfef8afa17..4863b96391 100644
--- a/src/script/standard.cpp
+++ b/src/script/standard.cpp
@@ -16,6 +16,7 @@ using namespace std;
 
 typedef vector<unsigned char> valtype;
 
+bool fAcceptDatacarrier = DEFAULT_ACCEPT_DATACARRIER;
 unsigned nMaxDatacarrierBytes = MAX_OP_RETURN_RELAY;
 
 CScriptID::CScriptID(const CScript& in) : uint160(Hash160(in.begin(), in.end())) {}
diff --git a/src/script/standard.h b/src/script/standard.h
index ae1bbecca0..2b9fbe78dd 100644
--- a/src/script/standard.h
+++ b/src/script/standard.h
@@ -13,6 +13,8 @@
 
 #include <stdint.h>
 
+static const bool DEFAULT_ACCEPT_DATACARRIER = true;
+
 class CKeyID;
 class CScript;
 
@@ -26,6 +28,7 @@ public:
 };
 
 static const unsigned int MAX_OP_RETURN_RELAY = 83; //! bytes (+1 for OP_RETURN, +2 for the pushdata opcodes)
+extern bool fAcceptDatacarrier;
 extern unsigned nMaxDatacarrierBytes;
 
 /**
diff --git a/src/util.cpp b/src/util.cpp
index a852bc3176..1913181712 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -99,6 +99,9 @@ namespace boost {
 
 using namespace std;
 
+const char * const BITCOIN_CONF_FILENAME = "bitcoin.conf";
+const char * const BITCOIN_PID_FILENAME = "bitcoind.pid";
+
 map<string, string> mapArgs;
 map<string, vector<string> > mapMultiArgs;
 bool fDebug = false;
@@ -107,9 +110,9 @@ bool fPrintToDebugLog = true;
 bool fDaemon = false;
 bool fServer = false;
 string strMiscWarning;
-bool fLogTimestamps = false;
+bool fLogTimestamps = DEFAULT_LOGTIMESTAMPS;
 bool fLogTimeMicros = DEFAULT_LOGTIMEMICROS;
-bool fLogIPs = false;
+bool fLogIPs = DEFAULT_LOGIPS;
 volatile bool fReopenDebugLog = false;
 CTranslationInterface translationInterface;
 
@@ -520,7 +523,7 @@ void ClearDatadirCache()
 
 boost::filesystem::path GetConfigFile()
 {
-    boost::filesystem::path pathConfigFile(GetArg("-conf", "bitcoin.conf"));
+    boost::filesystem::path pathConfigFile(GetArg("-conf", BITCOIN_CONF_FILENAME));
     if (!pathConfigFile.is_complete())
         pathConfigFile = GetDataDir(false) / pathConfigFile;
 
@@ -554,7 +557,7 @@ void ReadConfigFile(map<string, string>& mapSettingsRet,
 #ifndef WIN32
 boost::filesystem::path GetPidFile()
 {
-    boost::filesystem::path pathPidFile(GetArg("-pid", "bitcoind.pid"));
+    boost::filesystem::path pathPidFile(GetArg("-pid", BITCOIN_PID_FILENAME));
     if (!pathPidFile.is_complete()) pathPidFile = GetDataDir() / pathPidFile;
     return pathPidFile;
 }
diff --git a/src/util.h b/src/util.h
index b2779fe782..fb154f6660 100644
--- a/src/util.h
+++ b/src/util.h
@@ -29,6 +29,8 @@
 #include <boost/thread/exceptions.hpp>
 
 static const bool DEFAULT_LOGTIMEMICROS = false;
+static const bool DEFAULT_LOGIPS        = false;
+static const bool DEFAULT_LOGTIMESTAMPS = true;
 
 /** Signals for translation. */
 class CTranslationInterface
@@ -51,6 +53,9 @@ extern bool fLogIPs;
 extern volatile bool fReopenDebugLog;
 extern CTranslationInterface translationInterface;
 
+extern const char * const BITCOIN_CONF_FILENAME;
+extern const char * const BITCOIN_PID_FILENAME;
+
 /**
  * Translation function: Call Translate signal on UI interface, which returns a boost::optional result.
  * If no translation slot is registered, nothing is returned, and simply return the input.
diff --git a/src/wallet/db.cpp b/src/wallet/db.cpp
index cf6122813c..4b9dbebddd 100644
--- a/src/wallet/db.cpp
+++ b/src/wallet/db.cpp
@@ -85,7 +85,7 @@ bool CDBEnv::Open(const boost::filesystem::path& pathIn)
     LogPrintf("CDBEnv::Open: LogDir=%s ErrorFile=%s\n", pathLogDir.string(), pathErrorFile.string());
 
     unsigned int nEnvFlags = 0;
-    if (GetBoolArg("-privdb", true))
+    if (GetBoolArg("-privdb", DEFAULT_WALLET_PRIVDB))
         nEnvFlags |= DB_PRIVATE;
 
     dbenv->set_lg_dir(pathLogDir.string().c_str());
diff --git a/src/wallet/db.h b/src/wallet/db.h
index 46bc0ac0a9..7f58d03f08 100644
--- a/src/wallet/db.h
+++ b/src/wallet/db.h
@@ -21,6 +21,7 @@
 #include <db_cxx.h>
 
 static const unsigned int DEFAULT_WALLET_DBLOGSIZE = 100;
+static const bool DEFAULT_WALLET_PRIVDB = true;
 
 extern unsigned int nWalletDBUpdated;
 
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index c5246d909e..69b163ebc9 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -39,8 +39,8 @@ using namespace std;
 CFeeRate payTxFee(DEFAULT_TRANSACTION_FEE);
 CAmount maxTxFee = DEFAULT_TRANSACTION_MAXFEE;
 unsigned int nTxConfirmTarget = DEFAULT_TX_CONFIRM_TARGET;
-bool bSpendZeroConfChange = true;
-bool fSendFreeTransactions = false;
+bool bSpendZeroConfChange = DEFAULT_SPEND_ZEROCONF_CHANGE;
+bool fSendFreeTransactions = DEFAULT_SEND_FREE_TRANSACTIONS;
 bool fPayAtLeastCustomFee = true;
 
 /**
@@ -2260,7 +2260,7 @@ bool CWallet::NewKeyPool()
         if (IsLocked())
             return false;
 
-        int64_t nKeys = max(GetArg("-keypool", 100), (int64_t)0);
+        int64_t nKeys = max(GetArg("-keypool", DEFAULT_KEYPOOL_SIZE), (int64_t)0);
         for (int i = 0; i < nKeys; i++)
         {
             int64_t nIndex = i+1;
@@ -2287,7 +2287,7 @@ bool CWallet::TopUpKeyPool(unsigned int kpSize)
         if (kpSize > 0)
             nTargetSize = kpSize;
         else
-            nTargetSize = max(GetArg("-keypool", 100), (int64_t) 0);
+            nTargetSize = max(GetArg("-keypool", DEFAULT_KEYPOOL_SIZE), (int64_t) 0);
 
         while (setKeyPool.size() < (nTargetSize + 1))
         {
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index 7e846569ff..a4199488fc 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -37,6 +37,7 @@ extern bool bSpendZeroConfChange;
 extern bool fSendFreeTransactions;
 extern bool fPayAtLeastCustomFee;
 
+static const unsigned int DEFAULT_KEYPOOL_SIZE = 100;
 //! -paytxfee default
 static const CAmount DEFAULT_TRANSACTION_FEE = 0;
 //! -paytxfee will warn if called with a higher fee than this amount (in satoshis) per KB
@@ -47,12 +48,17 @@ static const CAmount DEFAULT_TRANSACTION_MINFEE = 1000;
 static const CAmount DEFAULT_TRANSACTION_MAXFEE = 0.1 * COIN;
 //! minimum change amount
 static const CAmount MIN_CHANGE = CENT;
+//! Default for -spendzeroconfchange
+static const bool DEFAULT_SPEND_ZEROCONF_CHANGE = true;
+//! Default for -sendfreetransactions
+static const bool DEFAULT_SEND_FREE_TRANSACTIONS = false;
 //! -txconfirmtarget default
 static const unsigned int DEFAULT_TX_CONFIRM_TARGET = 2;
 //! -maxtxfee will warn if called with a higher fee than this amount (in satoshis)
 static const CAmount nHighTransactionMaxFeeWarning = 100 * nHighTransactionFeeWarning;
 //! Largest (in bytes) free transaction we're willing to create
 static const unsigned int MAX_FREE_TRANSACTION_CREATE_SIZE = 1000;
+static const bool DEFAULT_WALLETBROADCAST = true;
 
 class CAccountingEntry;
 class CBlockIndex;
diff --git a/src/wallet/walletdb.cpp b/src/wallet/walletdb.cpp
index 9ce9f53bd9..5c08ee6d6c 100644
--- a/src/wallet/walletdb.cpp
+++ b/src/wallet/walletdb.cpp
@@ -810,7 +810,7 @@ void ThreadFlushWalletDB(const string& strFile)
     if (fOneThread)
         return;
     fOneThread = true;
-    if (!GetBoolArg("-flushwallet", true))
+    if (!GetBoolArg("-flushwallet", DEFAULT_FLUSHWALLET))
         return;
 
     unsigned int nLastSeen = nWalletDBUpdated;
diff --git a/src/wallet/walletdb.h b/src/wallet/walletdb.h
index 3ebc05afd1..77f7958814 100644
--- a/src/wallet/walletdb.h
+++ b/src/wallet/walletdb.h
@@ -16,6 +16,8 @@
 #include <utility>
 #include <vector>
 
+static const bool DEFAULT_FLUSHWALLET = true;
+
 class CAccount;
 class CAccountingEntry;
 struct CBlockLocator;