diff --git a/doc/developer-notes.md b/doc/developer-notes.md
index b00cceb9875..f8134c3aa3e 100644
--- a/doc/developer-notes.md
+++ b/doc/developer-notes.md
@@ -626,7 +626,7 @@ GUI
     holds: try to not directly access core data structures from Views.
 
 - Avoid adding slow or blocking code in the GUI thread. In particular do not
-  add new `interface::Node` and `interface::Wallet` method calls, even if they
+  add new `interfaces::Node` and `interfaces::Wallet` method calls, even if they
   may be fast now, in case they are changed to lock or communicate across
   processes in the future.
 
diff --git a/src/Makefile.am b/src/Makefile.am
index 605c9321203..2c6ba6a6e60 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -105,9 +105,9 @@ BITCOIN_CORE_H = \
   httpserver.h \
   indirectmap.h \
   init.h \
-  interface/handler.h \
-  interface/node.h \
-  interface/wallet.h \
+  interfaces/handler.h \
+  interfaces/node.h \
+  interfaces/wallet.h \
   key.h \
   key_io.h \
   keystore.h \
@@ -249,7 +249,7 @@ endif
 libbitcoin_wallet_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
 libbitcoin_wallet_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 libbitcoin_wallet_a_SOURCES = \
-  interface/wallet.cpp \
+  interfaces/wallet.cpp \
   wallet/crypter.cpp \
   wallet/db.cpp \
   wallet/feebumper.cpp \
@@ -362,8 +362,8 @@ libbitcoin_util_a_SOURCES = \
   compat/glibcxx_sanity.cpp \
   compat/strnlen.cpp \
   fs.cpp \
-  interface/handler.cpp \
-  interface/node.cpp \
+  interfaces/handler.cpp \
+  interfaces/node.cpp \
   random.cpp \
   rpc/protocol.cpp \
   rpc/util.cpp \
diff --git a/src/interface/README.md b/src/interfaces/README.md
similarity index 100%
rename from src/interface/README.md
rename to src/interfaces/README.md
diff --git a/src/interface/handler.cpp b/src/interfaces/handler.cpp
similarity index 89%
rename from src/interface/handler.cpp
rename to src/interfaces/handler.cpp
index 4b27f374f44..1443fe9f18f 100644
--- a/src/interface/handler.cpp
+++ b/src/interfaces/handler.cpp
@@ -2,7 +2,7 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#include <interface/handler.h>
+#include <interfaces/handler.h>
 
 #include <util.h>
 
@@ -10,7 +10,7 @@
 #include <memory>
 #include <utility>
 
-namespace interface {
+namespace interfaces {
 namespace {
 
 class HandlerImpl : public Handler
@@ -30,4 +30,4 @@ std::unique_ptr<Handler> MakeHandler(boost::signals2::connection connection)
     return MakeUnique<HandlerImpl>(std::move(connection));
 }
 
-} // namespace interface
+} // namespace interfaces
diff --git a/src/interface/handler.h b/src/interfaces/handler.h
similarity index 82%
rename from src/interface/handler.h
rename to src/interfaces/handler.h
index a76334bfbf0..c4c674cac5a 100644
--- a/src/interface/handler.h
+++ b/src/interfaces/handler.h
@@ -2,8 +2,8 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#ifndef BITCOIN_INTERFACE_HANDLER_H
-#define BITCOIN_INTERFACE_HANDLER_H
+#ifndef BITCOIN_INTERFACES_HANDLER_H
+#define BITCOIN_INTERFACES_HANDLER_H
 
 #include <memory>
 
@@ -13,7 +13,7 @@ class connection;
 } // namespace signals2
 } // namespace boost
 
-namespace interface {
+namespace interfaces {
 
 //! Generic interface for managing an event handler or callback function
 //! registered with another interface. Has a single disconnect method to cancel
@@ -30,6 +30,6 @@ public:
 //! Return handler wrapping a boost signal connection.
 std::unique_ptr<Handler> MakeHandler(boost::signals2::connection connection);
 
-} // namespace interface
+} // namespace interfaces
 
-#endif // BITCOIN_INTERFACE_HANDLER_H
+#endif // BITCOIN_INTERFACES_HANDLER_H
diff --git a/src/interface/node.cpp b/src/interfaces/node.cpp
similarity index 98%
rename from src/interface/node.cpp
rename to src/interfaces/node.cpp
index f04da4e1762..919748f9422 100644
--- a/src/interface/node.cpp
+++ b/src/interfaces/node.cpp
@@ -2,15 +2,15 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#include <interface/node.h>
+#include <interfaces/node.h>
 
 #include <addrdb.h>
 #include <amount.h>
 #include <chain.h>
 #include <chainparams.h>
 #include <init.h>
-#include <interface/handler.h>
-#include <interface/wallet.h>
+#include <interfaces/handler.h>
+#include <interfaces/wallet.h>
 #include <net.h>
 #include <net_processing.h>
 #include <netaddress.h>
@@ -43,7 +43,7 @@
 #include <boost/thread/thread.hpp>
 #include <univalue.h>
 
-namespace interface {
+namespace interfaces {
 namespace {
 
 class NodeImpl : public Node
@@ -305,4 +305,4 @@ class NodeImpl : public Node
 
 std::unique_ptr<Node> MakeNode() { return MakeUnique<NodeImpl>(); }
 
-} // namespace interface
+} // namespace interfaces
diff --git a/src/interface/node.h b/src/interfaces/node.h
similarity index 98%
rename from src/interface/node.h
rename to src/interfaces/node.h
index 6ae7f9e46c6..f375af2f195 100644
--- a/src/interface/node.h
+++ b/src/interfaces/node.h
@@ -2,8 +2,8 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#ifndef BITCOIN_INTERFACE_NODE_H
-#define BITCOIN_INTERFACE_NODE_H
+#ifndef BITCOIN_INTERFACES_NODE_H
+#define BITCOIN_INTERFACES_NODE_H
 
 #include <addrdb.h>     // For banmap_t
 #include <amount.h>     // For CAmount
@@ -29,7 +29,7 @@ class proxyType;
 enum class FeeReason;
 struct CNodeStateStats;
 
-namespace interface {
+namespace interfaces {
 
 class Handler;
 class Wallet;
@@ -254,6 +254,6 @@ public:
 //! Return implementation of Node interface.
 std::unique_ptr<Node> MakeNode();
 
-} // namespace interface
+} // namespace interfaces
 
-#endif // BITCOIN_INTERFACE_NODE_H
+#endif // BITCOIN_INTERFACES_NODE_H
diff --git a/src/interface/wallet.cpp b/src/interfaces/wallet.cpp
similarity index 99%
rename from src/interface/wallet.cpp
rename to src/interfaces/wallet.cpp
index a6bce7d3de5..0244fe70f59 100644
--- a/src/interface/wallet.cpp
+++ b/src/interfaces/wallet.cpp
@@ -2,12 +2,12 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#include <interface/wallet.h>
+#include <interfaces/wallet.h>
 
 #include <amount.h>
 #include <chain.h>
 #include <consensus/validation.h>
-#include <interface/handler.h>
+#include <interfaces/handler.h>
 #include <net.h>
 #include <policy/policy.h>
 #include <primitives/transaction.h>
@@ -24,7 +24,7 @@
 
 #include <memory>
 
-namespace interface {
+namespace interfaces {
 namespace {
 
 class PendingWalletTxImpl : public PendingWalletTx
@@ -283,7 +283,7 @@ public:
         return result;
     }
     bool tryGetTxStatus(const uint256& txid,
-        interface::WalletTxStatus& tx_status,
+        interfaces::WalletTxStatus& tx_status,
         int& num_blocks,
         int64_t& adjusted_time) override
     {
@@ -438,4 +438,4 @@ public:
 
 std::unique_ptr<Wallet> MakeWallet(CWallet& wallet) { return MakeUnique<WalletImpl>(wallet); }
 
-} // namespace interface
+} // namespace interfaces
diff --git a/src/interface/wallet.h b/src/interfaces/wallet.h
similarity index 98%
rename from src/interface/wallet.h
rename to src/interfaces/wallet.h
index b66ed63398f..3e27242c2c7 100644
--- a/src/interface/wallet.h
+++ b/src/interfaces/wallet.h
@@ -2,8 +2,8 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#ifndef BITCOIN_INTERFACE_WALLET_H
-#define BITCOIN_INTERFACE_WALLET_H
+#ifndef BITCOIN_INTERFACES_WALLET_H
+#define BITCOIN_INTERFACES_WALLET_H
 
 #include <amount.h>                    // For CAmount
 #include <pubkey.h>                    // For CTxDestination (CKeyID and CScriptID)
@@ -27,7 +27,7 @@ class CWallet;
 enum class OutputType;
 struct CRecipient;
 
-namespace interface {
+namespace interfaces {
 
 class Handler;
 class PendingWalletTx;
@@ -347,6 +347,6 @@ struct WalletTxOut
 //! in builds where ENABLE_WALLET is false.
 std::unique_ptr<Wallet> MakeWallet(CWallet& wallet);
 
-} // namespace interface
+} // namespace interfaces
 
-#endif // BITCOIN_INTERFACE_WALLET_H
+#endif // BITCOIN_INTERFACES_WALLET_H
diff --git a/src/qt/addresstablemodel.cpp b/src/qt/addresstablemodel.cpp
index a9408895d91..1e3acd75c01 100644
--- a/src/qt/addresstablemodel.cpp
+++ b/src/qt/addresstablemodel.cpp
@@ -7,7 +7,7 @@
 #include <qt/guiutil.h>
 #include <qt/walletmodel.h>
 
-#include <interface/node.h>
+#include <interfaces/node.h>
 #include <key_io.h>
 #include <wallet/wallet.h>
 
@@ -74,7 +74,7 @@ public:
     AddressTablePriv(AddressTableModel *_parent):
         parent(_parent) {}
 
-    void refreshAddressTable(interface::Wallet& wallet)
+    void refreshAddressTable(interfaces::Wallet& wallet)
     {
         cachedAddressTable.clear();
         {
diff --git a/src/qt/addresstablemodel.h b/src/qt/addresstablemodel.h
index 954f0f593ef..d7aeda9d8e2 100644
--- a/src/qt/addresstablemodel.h
+++ b/src/qt/addresstablemodel.h
@@ -13,7 +13,7 @@ enum class OutputType;
 class AddressTablePriv;
 class WalletModel;
 
-namespace interface {
+namespace interfaces {
 class Wallet;
 }
 
diff --git a/src/qt/bantablemodel.cpp b/src/qt/bantablemodel.cpp
index cbd67d70ab0..26cb03c2c7e 100644
--- a/src/qt/bantablemodel.cpp
+++ b/src/qt/bantablemodel.cpp
@@ -8,7 +8,7 @@
 #include <qt/guiconstants.h>
 #include <qt/guiutil.h>
 
-#include <interface/node.h>
+#include <interfaces/node.h>
 #include <sync.h>
 #include <utiltime.h>
 
@@ -46,7 +46,7 @@ public:
     Qt::SortOrder sortOrder;
 
     /** Pull a full list of banned nodes from CNode into our cache */
-    void refreshBanlist(interface::Node& node)
+    void refreshBanlist(interfaces::Node& node)
     {
         banmap_t banMap;
         node.getBanned(banMap);
@@ -82,7 +82,7 @@ public:
     }
 };
 
-BanTableModel::BanTableModel(interface::Node& node, ClientModel *parent) :
+BanTableModel::BanTableModel(interfaces::Node& node, ClientModel *parent) :
     QAbstractTableModel(parent),
     m_node(node),
     clientModel(parent)
diff --git a/src/qt/bantablemodel.h b/src/qt/bantablemodel.h
index 4c171e6fbea..d6c8dbf6dd3 100644
--- a/src/qt/bantablemodel.h
+++ b/src/qt/bantablemodel.h
@@ -15,7 +15,7 @@
 class ClientModel;
 class BanTablePriv;
 
-namespace interface {
+namespace interfaces {
     class Node;
 }
 
@@ -45,7 +45,7 @@ class BanTableModel : public QAbstractTableModel
     Q_OBJECT
 
 public:
-    explicit BanTableModel(interface::Node& node, ClientModel *parent = 0);
+    explicit BanTableModel(interfaces::Node& node, ClientModel *parent = 0);
     ~BanTableModel();
     void startAutoRefresh();
     void stopAutoRefresh();
@@ -71,7 +71,7 @@ public Q_SLOTS:
     void refresh();
 
 private:
-    interface::Node& m_node;
+    interfaces::Node& m_node;
     ClientModel *clientModel;
     QStringList columns;
     std::unique_ptr<BanTablePriv> priv;
diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
index 30d0acb7ef8..db60ec9885a 100644
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -27,8 +27,8 @@
 #endif
 
 #include <init.h>
-#include <interface/handler.h>
-#include <interface/node.h>
+#include <interfaces/handler.h>
+#include <interfaces/node.h>
 #include <rpc/server.h>
 #include <ui_interface.h>
 #include <uint256.h>
@@ -182,7 +182,7 @@ class BitcoinCore: public QObject
 {
     Q_OBJECT
 public:
-    explicit BitcoinCore(interface::Node& node);
+    explicit BitcoinCore(interfaces::Node& node);
 
 public Q_SLOTS:
     void initialize();
@@ -197,7 +197,7 @@ private:
     /// Pass fatal exception message to UI thread
     void handleRunawayException(const std::exception *e);
 
-    interface::Node& m_node;
+    interfaces::Node& m_node;
 };
 
 /** Main Bitcoin application object */
@@ -205,7 +205,7 @@ class BitcoinApplication: public QApplication
 {
     Q_OBJECT
 public:
-    explicit BitcoinApplication(interface::Node& node, int &argc, char **argv);
+    explicit BitcoinApplication(interfaces::Node& node, int &argc, char **argv);
     ~BitcoinApplication();
 
 #ifdef ENABLE_WALLET
@@ -246,7 +246,7 @@ Q_SIGNALS:
 
 private:
     QThread *coreThread;
-    interface::Node& m_node;
+    interfaces::Node& m_node;
     OptionsModel *optionsModel;
     ClientModel *clientModel;
     BitcoinGUI *window;
@@ -264,7 +264,7 @@ private:
 
 #include <qt/bitcoin.moc>
 
-BitcoinCore::BitcoinCore(interface::Node& node) :
+BitcoinCore::BitcoinCore(interfaces::Node& node) :
     QObject(), m_node(node)
 {
 }
@@ -304,7 +304,7 @@ void BitcoinCore::shutdown()
     }
 }
 
-BitcoinApplication::BitcoinApplication(interface::Node& node, int &argc, char **argv):
+BitcoinApplication::BitcoinApplication(interfaces::Node& node, int &argc, char **argv):
     QApplication(argc, argv),
     coreThread(0),
     m_node(node),
@@ -535,7 +535,7 @@ int main(int argc, char *argv[])
 {
     SetupEnvironment();
 
-    std::unique_ptr<interface::Node> node = interface::MakeNode();
+    std::unique_ptr<interfaces::Node> node = interfaces::MakeNode();
 
     /// 1. Parse command-line options. These take precedence over anything else.
     // Command-line options take precedence:
@@ -687,7 +687,7 @@ int main(int argc, char *argv[])
     app.createOptionsModel(gArgs.GetBoolArg("-resetguisettings", false));
 
     // Subscribe to global signals from core
-    std::unique_ptr<interface::Handler> handler = node->handleInitMessage(InitMessage);
+    std::unique_ptr<interfaces::Handler> handler = node->handleInitMessage(InitMessage);
 
     if (gArgs.GetBoolArg("-splash", DEFAULT_SPLASHSCREEN) && !gArgs.GetBoolArg("-min", false))
         app.createSplashScreen(networkStyle.data());
diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
index 63a2a200b2d..bfa8844a09a 100644
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -30,8 +30,8 @@
 
 #include <chainparams.h>
 #include <init.h>
-#include <interface/handler.h>
-#include <interface/node.h>
+#include <interfaces/handler.h>
+#include <interfaces/node.h>
 #include <ui_interface.h>
 #include <util.h>
 
@@ -74,7 +74,7 @@ const std::string BitcoinGUI::DEFAULT_UIPLATFORM =
 #endif
         ;
 
-BitcoinGUI::BitcoinGUI(interface::Node& node, const PlatformStyle *_platformStyle, const NetworkStyle *networkStyle, QWidget *parent) :
+BitcoinGUI::BitcoinGUI(interfaces::Node& node, const PlatformStyle *_platformStyle, const NetworkStyle *networkStyle, QWidget *parent) :
     QMainWindow(parent),
     enableWallet(false),
     m_node(node),
diff --git a/src/qt/bitcoingui.h b/src/qt/bitcoingui.h
index 3a4b25d8047..e59c71cd4f4 100644
--- a/src/qt/bitcoingui.h
+++ b/src/qt/bitcoingui.h
@@ -33,7 +33,7 @@ class WalletModel;
 class HelpMessageDialog;
 class ModalOverlay;
 
-namespace interface {
+namespace interfaces {
 class Handler;
 class Node;
 }
@@ -56,7 +56,7 @@ class BitcoinGUI : public QMainWindow
 public:
     static const std::string DEFAULT_UIPLATFORM;
 
-    explicit BitcoinGUI(interface::Node& node, const PlatformStyle *platformStyle, const NetworkStyle *networkStyle, QWidget *parent = 0);
+    explicit BitcoinGUI(interfaces::Node& node, const PlatformStyle *platformStyle, const NetworkStyle *networkStyle, QWidget *parent = 0);
     ~BitcoinGUI();
 
     /** Set the client model.
@@ -83,9 +83,9 @@ protected:
     bool eventFilter(QObject *object, QEvent *event);
 
 private:
-    interface::Node& m_node;
-    std::unique_ptr<interface::Handler> m_handler_message_box;
-    std::unique_ptr<interface::Handler> m_handler_question;
+    interfaces::Node& m_node;
+    std::unique_ptr<interfaces::Handler> m_handler_message_box;
+    std::unique_ptr<interfaces::Handler> m_handler_question;
     ClientModel *clientModel;
     WalletFrame *walletFrame;
 
diff --git a/src/qt/clientmodel.cpp b/src/qt/clientmodel.cpp
index 1dbfc815b63..37fd06ccc91 100644
--- a/src/qt/clientmodel.cpp
+++ b/src/qt/clientmodel.cpp
@@ -13,8 +13,8 @@
 #include <chainparams.h>
 #include <checkpoints.h>
 #include <clientversion.h>
-#include <interface/handler.h>
-#include <interface/node.h>
+#include <interfaces/handler.h>
+#include <interfaces/node.h>
 #include <validation.h>
 #include <net.h>
 #include <txmempool.h>
@@ -32,7 +32,7 @@ class CBlockIndex;
 static int64_t nLastHeaderTipUpdateNotification = 0;
 static int64_t nLastBlockTipUpdateNotification = 0;
 
-ClientModel::ClientModel(interface::Node& node, OptionsModel *_optionsModel, QObject *parent) :
+ClientModel::ClientModel(interfaces::Node& node, OptionsModel *_optionsModel, QObject *parent) :
     QObject(parent),
     m_node(node),
     optionsModel(_optionsModel),
diff --git a/src/qt/clientmodel.h b/src/qt/clientmodel.h
index 9faa10b87e6..a609222f7db 100644
--- a/src/qt/clientmodel.h
+++ b/src/qt/clientmodel.h
@@ -17,7 +17,7 @@ class PeerTableModel;
 
 class CBlockIndex;
 
-namespace interface {
+namespace interfaces {
 class Handler;
 class Node;
 }
@@ -46,10 +46,10 @@ class ClientModel : public QObject
     Q_OBJECT
 
 public:
-    explicit ClientModel(interface::Node& node, OptionsModel *optionsModel, QObject *parent = 0);
+    explicit ClientModel(interfaces::Node& node, OptionsModel *optionsModel, QObject *parent = 0);
     ~ClientModel();
 
-    interface::Node& node() const { return m_node; }
+    interfaces::Node& node() const { return m_node; }
     OptionsModel *getOptionsModel();
     PeerTableModel *getPeerTableModel();
     BanTableModel *getBanTableModel();
@@ -75,14 +75,14 @@ public:
     mutable std::atomic<int64_t> cachedBestHeaderTime;
 
 private:
-    interface::Node& m_node;
-    std::unique_ptr<interface::Handler> m_handler_show_progress;
-    std::unique_ptr<interface::Handler> m_handler_notify_num_connections_changed;
-    std::unique_ptr<interface::Handler> m_handler_notify_network_active_changed;
-    std::unique_ptr<interface::Handler> m_handler_notify_alert_changed;
-    std::unique_ptr<interface::Handler> m_handler_banned_list_changed;
-    std::unique_ptr<interface::Handler> m_handler_notify_block_tip;
-    std::unique_ptr<interface::Handler> m_handler_notify_header_tip;
+    interfaces::Node& m_node;
+    std::unique_ptr<interfaces::Handler> m_handler_show_progress;
+    std::unique_ptr<interfaces::Handler> m_handler_notify_num_connections_changed;
+    std::unique_ptr<interfaces::Handler> m_handler_notify_network_active_changed;
+    std::unique_ptr<interfaces::Handler> m_handler_notify_alert_changed;
+    std::unique_ptr<interfaces::Handler> m_handler_banned_list_changed;
+    std::unique_ptr<interfaces::Handler> m_handler_notify_block_tip;
+    std::unique_ptr<interfaces::Handler> m_handler_notify_header_tip;
     OptionsModel *optionsModel;
     PeerTableModel *peerTableModel;
     BanTableModel *banTableModel;
diff --git a/src/qt/coincontroldialog.cpp b/src/qt/coincontroldialog.cpp
index 2081d6ca08b..601a77fc85b 100644
--- a/src/qt/coincontroldialog.cpp
+++ b/src/qt/coincontroldialog.cpp
@@ -14,7 +14,7 @@
 #include <qt/walletmodel.h>
 
 #include <wallet/coincontrol.h>
-#include <interface/node.h>
+#include <interfaces/node.h>
 #include <key_io.h>
 #include <policy/fees.h>
 #include <policy/policy.h>
@@ -648,7 +648,7 @@ void CoinControlDialog::updateView()
         int nChildren = 0;
         for (const auto& outpair : coins.second) {
             const COutPoint& output = std::get<0>(outpair);
-            const interface::WalletTxOut& out = std::get<1>(outpair);
+            const interfaces::WalletTxOut& out = std::get<1>(outpair);
             nSum += out.txout.nValue;
             nChildren++;
 
diff --git a/src/qt/guiutil.cpp b/src/qt/guiutil.cpp
index 3501f97908c..c76fc4ca6df 100644
--- a/src/qt/guiutil.cpp
+++ b/src/qt/guiutil.cpp
@@ -13,7 +13,7 @@
 #include <chainparams.h>
 #include <primitives/transaction.h>
 #include <key_io.h>
-#include <interface/node.h>
+#include <interfaces/node.h>
 #include <policy/policy.h>
 #include <protocol.h>
 #include <script/script.h>
@@ -232,7 +232,7 @@ QString formatBitcoinURI(const SendCoinsRecipient &info)
     return ret;
 }
 
-bool isDust(interface::Node& node, const QString& address, const CAmount& amount)
+bool isDust(interfaces::Node& node, const QString& address, const CAmount& amount)
 {
     CTxDestination dest = DecodeDestination(address.toStdString());
     CScript script = GetScriptForDestination(dest);
diff --git a/src/qt/guiutil.h b/src/qt/guiutil.h
index 40037edb9dd..4a269640981 100644
--- a/src/qt/guiutil.h
+++ b/src/qt/guiutil.h
@@ -20,7 +20,7 @@
 class QValidatedLineEdit;
 class SendCoinsRecipient;
 
-namespace interface
+namespace interfaces
 {
     class Node;
 }
@@ -54,7 +54,7 @@ namespace GUIUtil
     QString formatBitcoinURI(const SendCoinsRecipient &info);
 
     // Returns true if given address+amount meets "dust" definition
-    bool isDust(interface::Node& node, const QString& address, const CAmount& amount);
+    bool isDust(interfaces::Node& node, const QString& address, const CAmount& amount);
 
     // HTML escaping for rich text controls
     QString HtmlEscape(const QString& str, bool fMultiLine=false);
diff --git a/src/qt/intro.cpp b/src/qt/intro.cpp
index 4eb7482018d..8c00ca03637 100644
--- a/src/qt/intro.cpp
+++ b/src/qt/intro.cpp
@@ -12,7 +12,7 @@
 
 #include <qt/guiutil.h>
 
-#include <interface/node.h>
+#include <interfaces/node.h>
 #include <util.h>
 
 #include <QFileDialog>
@@ -187,7 +187,7 @@ QString Intro::getDefaultDataDirectory()
     return GUIUtil::boostPathToQString(GetDefaultDataDir());
 }
 
-bool Intro::pickDataDirectory(interface::Node& node)
+bool Intro::pickDataDirectory(interfaces::Node& node)
 {
     QSettings settings;
     /* If data directory provided on command line, no need to look at settings
diff --git a/src/qt/intro.h b/src/qt/intro.h
index 07d2025bb61..b0937aedcb3 100644
--- a/src/qt/intro.h
+++ b/src/qt/intro.h
@@ -13,7 +13,7 @@ static const bool DEFAULT_CHOOSE_DATADIR = false;
 
 class FreespaceChecker;
 
-namespace interface {
+namespace interfaces {
     class Node;
 }
 
@@ -45,7 +45,7 @@ public:
      * @note do NOT call global GetDataDir() before calling this function, this
      * will cause the wrong path to be cached.
      */
-    static bool pickDataDirectory(interface::Node& node);
+    static bool pickDataDirectory(interfaces::Node& node);
 
     /**
      * Determine default data directory for operating system.
diff --git a/src/qt/optionsdialog.cpp b/src/qt/optionsdialog.cpp
index 438e9e70f12..c0ddb89b404 100644
--- a/src/qt/optionsdialog.cpp
+++ b/src/qt/optionsdialog.cpp
@@ -13,7 +13,7 @@
 #include <qt/guiutil.h>
 #include <qt/optionsmodel.h>
 
-#include <interface/node.h>
+#include <interfaces/node.h>
 #include <validation.h> // for DEFAULT_SCRIPTCHECK_THREADS and MAX_SCRIPTCHECK_THREADS
 #include <netbase.h>
 #include <txdb.h> // for -dbcache defaults
diff --git a/src/qt/optionsmodel.cpp b/src/qt/optionsmodel.cpp
index d8197b6ec67..30c8124c589 100644
--- a/src/qt/optionsmodel.cpp
+++ b/src/qt/optionsmodel.cpp
@@ -11,7 +11,7 @@
 #include <qt/bitcoinunits.h>
 #include <qt/guiutil.h>
 
-#include <interface/node.h>
+#include <interfaces/node.h>
 #include <validation.h> // For DEFAULT_SCRIPTCHECK_THREADS
 #include <net.h>
 #include <netbase.h>
@@ -24,7 +24,7 @@
 
 const char *DEFAULT_GUI_PROXY_HOST = "127.0.0.1";
 
-OptionsModel::OptionsModel(interface::Node& node, QObject *parent, bool resetSettings) :
+OptionsModel::OptionsModel(interfaces::Node& node, QObject *parent, bool resetSettings) :
     QAbstractListModel(parent), m_node(node)
 {
     Init(resetSettings);
diff --git a/src/qt/optionsmodel.h b/src/qt/optionsmodel.h
index 96c6b8fa453..fc1d119a710 100644
--- a/src/qt/optionsmodel.h
+++ b/src/qt/optionsmodel.h
@@ -9,7 +9,7 @@
 
 #include <QAbstractListModel>
 
-namespace interface {
+namespace interfaces {
 class Node;
 }
 
@@ -31,7 +31,7 @@ class OptionsModel : public QAbstractListModel
     Q_OBJECT
 
 public:
-    explicit OptionsModel(interface::Node& node, QObject *parent = 0, bool resetSettings = false);
+    explicit OptionsModel(interfaces::Node& node, QObject *parent = 0, bool resetSettings = false);
 
     enum OptionID {
         StartAtStartup,         // bool
@@ -79,10 +79,10 @@ public:
     void setRestartRequired(bool fRequired);
     bool isRestartRequired() const;
 
-    interface::Node& node() const { return m_node; }
+    interfaces::Node& node() const { return m_node; }
 
 private:
-    interface::Node& m_node;
+    interfaces::Node& m_node;
     /* Qt-only settings */
     bool fHideTrayIcon;
     bool fMinimizeToTray;
diff --git a/src/qt/overviewpage.cpp b/src/qt/overviewpage.cpp
index 76d02206482..8e8788dad3a 100644
--- a/src/qt/overviewpage.cpp
+++ b/src/qt/overviewpage.cpp
@@ -21,7 +21,7 @@
 #define DECORATION_SIZE 54
 #define NUM_ITEMS 5
 
-Q_DECLARE_METATYPE(interface::WalletBalances)
+Q_DECLARE_METATYPE(interfaces::WalletBalances)
 
 class TxViewDelegate : public QAbstractItemDelegate
 {
@@ -157,7 +157,7 @@ OverviewPage::~OverviewPage()
     delete ui;
 }
 
-void OverviewPage::setBalance(const interface::WalletBalances& balances)
+void OverviewPage::setBalance(const interfaces::WalletBalances& balances)
 {
     int unit = walletModel->getOptionsModel()->getDisplayUnit();
     m_balances = balances;
@@ -224,10 +224,10 @@ void OverviewPage::setWalletModel(WalletModel *model)
         ui->listTransactions->setModelColumn(TransactionTableModel::ToAddress);
 
         // Keep up to date with wallet
-        interface::Wallet& wallet = model->wallet();
-        interface::WalletBalances balances = wallet.getBalances();
+        interfaces::Wallet& wallet = model->wallet();
+        interfaces::WalletBalances balances = wallet.getBalances();
         setBalance(balances);
-        connect(model, SIGNAL(balanceChanged(interface::WalletBalances)), this, SLOT(setBalance(interface::WalletBalances)));
+        connect(model, SIGNAL(balanceChanged(interfaces::WalletBalances)), this, SLOT(setBalance(interfaces::WalletBalances)));
 
         connect(model->getOptionsModel(), SIGNAL(displayUnitChanged(int)), this, SLOT(updateDisplayUnit()));
 
diff --git a/src/qt/overviewpage.h b/src/qt/overviewpage.h
index 36333536e55..d519eca43a3 100644
--- a/src/qt/overviewpage.h
+++ b/src/qt/overviewpage.h
@@ -5,7 +5,7 @@
 #ifndef BITCOIN_QT_OVERVIEWPAGE_H
 #define BITCOIN_QT_OVERVIEWPAGE_H
 
-#include <interface/wallet.h>
+#include <interfaces/wallet.h>
 
 #include <QWidget>
 #include <memory>
@@ -38,7 +38,7 @@ public:
     void showOutOfSyncWarning(bool fShow);
 
 public Q_SLOTS:
-    void setBalance(const interface::WalletBalances& balances);
+    void setBalance(const interfaces::WalletBalances& balances);
 
 Q_SIGNALS:
     void transactionClicked(const QModelIndex &index);
@@ -48,7 +48,7 @@ private:
     Ui::OverviewPage *ui;
     ClientModel *clientModel;
     WalletModel *walletModel;
-    interface::WalletBalances m_balances;
+    interfaces::WalletBalances m_balances;
 
     TxViewDelegate *txdelegate;
     std::unique_ptr<TransactionFilterProxy> filter;
diff --git a/src/qt/paymentserver.cpp b/src/qt/paymentserver.cpp
index 926a699754d..70cdb3361c3 100644
--- a/src/qt/paymentserver.cpp
+++ b/src/qt/paymentserver.cpp
@@ -9,7 +9,7 @@
 #include <qt/optionsmodel.h>
 
 #include <chainparams.h>
-#include <interface/node.h>
+#include <interfaces/node.h>
 #include <policy/policy.h>
 #include <key_io.h>
 #include <ui_interface.h>
@@ -201,7 +201,7 @@ void PaymentServer::LoadRootCAs(X509_STORE* _store)
 // Warning: ipcSendCommandLine() is called early in init,
 // so don't use "Q_EMIT message()", but "QMessageBox::"!
 //
-void PaymentServer::ipcParseCommandLine(interface::Node& node, int argc, char* argv[])
+void PaymentServer::ipcParseCommandLine(interfaces::Node& node, int argc, char* argv[])
 {
     for (int i = 1; i < argc; i++)
     {
@@ -760,7 +760,7 @@ void PaymentServer::handlePaymentACK(const QString& paymentACKMsg)
     Q_EMIT message(tr("Payment acknowledged"), paymentACKMsg, CClientUIInterface::ICON_INFORMATION | CClientUIInterface::MODAL);
 }
 
-bool PaymentServer::verifyNetwork(interface::Node& node, const payments::PaymentDetails& requestDetails)
+bool PaymentServer::verifyNetwork(interfaces::Node& node, const payments::PaymentDetails& requestDetails)
 {
     bool fVerified = requestDetails.network() == node.getNetwork();
     if (!fVerified) {
diff --git a/src/qt/paymentserver.h b/src/qt/paymentserver.h
index e139899e22c..511fc5bd6ee 100644
--- a/src/qt/paymentserver.h
+++ b/src/qt/paymentserver.h
@@ -60,7 +60,7 @@ class PaymentServer : public QObject
 public:
     // Parse URIs on command line
     // Returns false on error
-    static void ipcParseCommandLine(interface::Node& node, int argc, char *argv[]);
+    static void ipcParseCommandLine(interfaces::Node& node, int argc, char *argv[]);
 
     // Returns true if there were URIs on the command line
     // which were successfully sent to an already-running
@@ -87,7 +87,7 @@ public:
     void setOptionsModel(OptionsModel *optionsModel);
 
     // Verify that the payment request network matches the client network
-    static bool verifyNetwork(interface::Node& node, const payments::PaymentDetails& requestDetails);
+    static bool verifyNetwork(interfaces::Node& node, const payments::PaymentDetails& requestDetails);
     // Verify if the payment request is expired
     static bool verifyExpired(const payments::PaymentDetails& requestDetails);
     // Verify the payment request size is valid as per BIP70
diff --git a/src/qt/peertablemodel.cpp b/src/qt/peertablemodel.cpp
index f33db8e7613..7e318e3035a 100644
--- a/src/qt/peertablemodel.cpp
+++ b/src/qt/peertablemodel.cpp
@@ -8,7 +8,7 @@
 #include <qt/guiconstants.h>
 #include <qt/guiutil.h>
 
-#include <interface/node.h>
+#include <interfaces/node.h>
 #include <validation.h> // for cs_main
 #include <sync.h>
 
@@ -57,12 +57,12 @@ public:
     std::map<NodeId, int> mapNodeRows;
 
     /** Pull a full list of peers from vNodes into our cache */
-    void refreshPeers(interface::Node& node)
+    void refreshPeers(interfaces::Node& node)
     {
         {
             cachedNodeStats.clear();
 
-            interface::Node::NodesStats nodes_stats;
+            interfaces::Node::NodesStats nodes_stats;
             node.getNodesStats(nodes_stats);
 #if QT_VERSION >= 0x040700
             cachedNodeStats.reserve(nodes_stats.size());
@@ -102,7 +102,7 @@ public:
     }
 };
 
-PeerTableModel::PeerTableModel(interface::Node& node, ClientModel *parent) :
+PeerTableModel::PeerTableModel(interfaces::Node& node, ClientModel *parent) :
     QAbstractTableModel(parent),
     m_node(node),
     clientModel(parent),
diff --git a/src/qt/peertablemodel.h b/src/qt/peertablemodel.h
index c53462c57c9..69c9744c8fb 100644
--- a/src/qt/peertablemodel.h
+++ b/src/qt/peertablemodel.h
@@ -16,7 +16,7 @@
 class ClientModel;
 class PeerTablePriv;
 
-namespace interface {
+namespace interfaces {
 class Node;
 }
 
@@ -51,7 +51,7 @@ class PeerTableModel : public QAbstractTableModel
     Q_OBJECT
 
 public:
-    explicit PeerTableModel(interface::Node& node, ClientModel *parent = 0);
+    explicit PeerTableModel(interfaces::Node& node, ClientModel *parent = 0);
     ~PeerTableModel();
     const CNodeCombinedStats *getNodeStats(int idx);
     int getRowByNodeId(NodeId nodeid);
@@ -82,7 +82,7 @@ public Q_SLOTS:
     void refresh();
 
 private:
-    interface::Node& m_node;
+    interfaces::Node& m_node;
     ClientModel *clientModel;
     QStringList columns;
     std::unique_ptr<PeerTablePriv> priv;
diff --git a/src/qt/rpcconsole.cpp b/src/qt/rpcconsole.cpp
index 745055b9448..5122bab36f9 100644
--- a/src/qt/rpcconsole.cpp
+++ b/src/qt/rpcconsole.cpp
@@ -14,7 +14,7 @@
 #include <qt/platformstyle.h>
 #include <qt/walletmodel.h>
 #include <chainparams.h>
-#include <interface/node.h>
+#include <interfaces/node.h>
 #include <netbase.h>
 #include <rpc/server.h>
 #include <rpc/client.h>
@@ -85,7 +85,7 @@ class RPCExecutor : public QObject
 {
     Q_OBJECT
 public:
-    RPCExecutor(interface::Node& node) : m_node(node) {}
+    RPCExecutor(interfaces::Node& node) : m_node(node) {}
 
 public Q_SLOTS:
     void request(const QString &command, const QString &walletID);
@@ -94,7 +94,7 @@ Q_SIGNALS:
     void reply(int category, const QString &command);
 
 private:
-    interface::Node& m_node;
+    interfaces::Node& m_node;
 };
 
 /** Class for handling RPC timers
@@ -153,7 +153,7 @@ public:
  * @param[out]   pstrFilteredOut  Command line, filtered to remove any sensitive data
  */
 
-bool RPCConsole::RPCParseCommandLine(interface::Node* node, std::string &strResult, const std::string &strCommand, const bool fExecute, std::string * const pstrFilteredOut, const std::string *walletID)
+bool RPCConsole::RPCParseCommandLine(interfaces::Node* node, std::string &strResult, const std::string &strCommand, const bool fExecute, std::string * const pstrFilteredOut, const std::string *walletID)
 {
     std::vector< std::vector<std::string> > stack;
     stack.push_back(std::vector<std::string>());
@@ -451,7 +451,7 @@ void RPCExecutor::request(const QString &command, const QString &walletID)
     }
 }
 
-RPCConsole::RPCConsole(interface::Node& node, const PlatformStyle *_platformStyle, QWidget *parent) :
+RPCConsole::RPCConsole(interfaces::Node& node, const PlatformStyle *_platformStyle, QWidget *parent) :
     QWidget(parent),
     m_node(node),
     ui(new Ui::RPCConsole),
@@ -575,7 +575,7 @@ void RPCConsole::setClientModel(ClientModel *model)
         setNumConnections(model->getNumConnections());
         connect(model, SIGNAL(numConnectionsChanged(int)), this, SLOT(setNumConnections(int)));
 
-        interface::Node& node = clientModel->node();
+        interfaces::Node& node = clientModel->node();
         setNumBlocks(node.getNumBlocks(), QDateTime::fromTime_t(node.getLastBlockTime()), node.getVerificationProgress(), false);
         connect(model, SIGNAL(numBlocksChanged(int,QDateTime,double,bool)), this, SLOT(setNumBlocks(int,QDateTime,double,bool)));
 
diff --git a/src/qt/rpcconsole.h b/src/qt/rpcconsole.h
index 8381301759f..a9a60d09f10 100644
--- a/src/qt/rpcconsole.h
+++ b/src/qt/rpcconsole.h
@@ -19,7 +19,7 @@ class PlatformStyle;
 class RPCTimerInterface;
 class WalletModel;
 
-namespace interface {
+namespace interfaces {
     class Node;
 }
 
@@ -38,11 +38,11 @@ class RPCConsole: public QWidget
     Q_OBJECT
 
 public:
-    explicit RPCConsole(interface::Node& node, const PlatformStyle *platformStyle, QWidget *parent);
+    explicit RPCConsole(interfaces::Node& node, const PlatformStyle *platformStyle, QWidget *parent);
     ~RPCConsole();
 
-    static bool RPCParseCommandLine(interface::Node* node, std::string &strResult, const std::string &strCommand, bool fExecute, std::string * const pstrFilteredOut = nullptr, const std::string *walletID = nullptr);
-    static bool RPCExecuteCommandLine(interface::Node& node, std::string &strResult, const std::string &strCommand, std::string * const pstrFilteredOut = nullptr, const std::string *walletID = nullptr) {
+    static bool RPCParseCommandLine(interfaces::Node* node, std::string &strResult, const std::string &strCommand, bool fExecute, std::string * const pstrFilteredOut = nullptr, const std::string *walletID = nullptr);
+    static bool RPCExecuteCommandLine(interfaces::Node& node, std::string &strResult, const std::string &strCommand, std::string * const pstrFilteredOut = nullptr, const std::string *walletID = nullptr) {
         return RPCParseCommandLine(&node, strResult, strCommand, true, pstrFilteredOut, walletID);
     }
 
@@ -144,7 +144,7 @@ private:
 
     };
 
-    interface::Node& m_node;
+    interfaces::Node& m_node;
     Ui::RPCConsole *ui;
     ClientModel *clientModel;
     QStringList history;
diff --git a/src/qt/sendcoinsdialog.cpp b/src/qt/sendcoinsdialog.cpp
index b4c1471a4f2..0874a0ada49 100644
--- a/src/qt/sendcoinsdialog.cpp
+++ b/src/qt/sendcoinsdialog.cpp
@@ -15,7 +15,7 @@
 #include <qt/sendcoinsentry.h>
 
 #include <chainparams.h>
-#include <interface/node.h>
+#include <interfaces/node.h>
 #include <key_io.h>
 #include <wallet/coincontrol.h>
 #include <ui_interface.h>
@@ -149,9 +149,9 @@ void SendCoinsDialog::setModel(WalletModel *_model)
             }
         }
 
-        interface::WalletBalances balances = _model->wallet().getBalances();
+        interfaces::WalletBalances balances = _model->wallet().getBalances();
         setBalance(balances);
-        connect(_model, SIGNAL(balanceChanged(interface::WalletBalances)), this, SLOT(setBalance(interface::WalletBalances)));
+        connect(_model, SIGNAL(balanceChanged(interfaces::WalletBalances)), this, SLOT(setBalance(interfaces::WalletBalances)));
         connect(_model->getOptionsModel(), SIGNAL(displayUnitChanged(int)), this, SLOT(updateDisplayUnit()));
         updateDisplayUnit();
 
@@ -515,7 +515,7 @@ bool SendCoinsDialog::handlePaymentRequest(const SendCoinsRecipient &rv)
     return true;
 }
 
-void SendCoinsDialog::setBalance(const interface::WalletBalances& balances)
+void SendCoinsDialog::setBalance(const interfaces::WalletBalances& balances)
 {
     if(model && model->getOptionsModel())
     {
diff --git a/src/qt/sendcoinsdialog.h b/src/qt/sendcoinsdialog.h
index 43757e3186d..40a1d10c2bb 100644
--- a/src/qt/sendcoinsdialog.h
+++ b/src/qt/sendcoinsdialog.h
@@ -51,7 +51,7 @@ public Q_SLOTS:
     void accept();
     SendCoinsEntry *addEntry();
     void updateTabsAndLabels();
-    void setBalance(const interface::WalletBalances& balances);
+    void setBalance(const interfaces::WalletBalances& balances);
 
 Q_SIGNALS:
     void coinsSent(const uint256& txid);
diff --git a/src/qt/sendcoinsentry.cpp b/src/qt/sendcoinsentry.cpp
index 6a961d83ea5..977425f7e36 100644
--- a/src/qt/sendcoinsentry.cpp
+++ b/src/qt/sendcoinsentry.cpp
@@ -127,7 +127,7 @@ void SendCoinsEntry::useAvailableBalanceClicked()
     Q_EMIT useAvailableBalance(this);
 }
 
-bool SendCoinsEntry::validate(interface::Node& node)
+bool SendCoinsEntry::validate(interfaces::Node& node)
 {
     if (!model)
         return false;
diff --git a/src/qt/sendcoinsentry.h b/src/qt/sendcoinsentry.h
index 715f4cfde5e..76f96c61e08 100644
--- a/src/qt/sendcoinsentry.h
+++ b/src/qt/sendcoinsentry.h
@@ -30,7 +30,7 @@ public:
     ~SendCoinsEntry();
 
     void setModel(WalletModel *model);
-    bool validate(interface::Node& node);
+    bool validate(interfaces::Node& node);
     SendCoinsRecipient getValue();
 
     /** Return whether the entry is still empty and unedited */
diff --git a/src/qt/splashscreen.cpp b/src/qt/splashscreen.cpp
index 2475a82ef90..4d972b431cf 100644
--- a/src/qt/splashscreen.cpp
+++ b/src/qt/splashscreen.cpp
@@ -12,9 +12,9 @@
 
 #include <clientversion.h>
 #include <init.h>
-#include <interface/handler.h>
-#include <interface/node.h>
-#include <interface/wallet.h>
+#include <interfaces/handler.h>
+#include <interfaces/node.h>
+#include <interfaces/wallet.h>
 #include <util.h>
 #include <ui_interface.h>
 #include <version.h>
@@ -25,7 +25,7 @@
 #include <QPainter>
 #include <QRadialGradient>
 
-SplashScreen::SplashScreen(interface::Node& node, Qt::WindowFlags f, const NetworkStyle *networkStyle) :
+SplashScreen::SplashScreen(interfaces::Node& node, Qt::WindowFlags f, const NetworkStyle *networkStyle) :
     QWidget(0, f), curAlignment(0), m_node(node)
 {
     // set reference point, paddings
@@ -177,7 +177,7 @@ static void ShowProgress(SplashScreen *splash, const std::string &title, int nPr
             strprintf("\n%d", nProgress) + "%");
 }
 #ifdef ENABLE_WALLET
-void SplashScreen::ConnectWallet(std::unique_ptr<interface::Wallet> wallet)
+void SplashScreen::ConnectWallet(std::unique_ptr<interfaces::Wallet> wallet)
 {
     m_connected_wallet_handlers.emplace_back(wallet->handleShowProgress(boost::bind(ShowProgress, this, _1, _2, false)));
     m_connected_wallets.emplace_back(std::move(wallet));
@@ -190,7 +190,7 @@ void SplashScreen::subscribeToCoreSignals()
     m_handler_init_message = m_node.handleInitMessage(boost::bind(InitMessage, this, _1));
     m_handler_show_progress = m_node.handleShowProgress(boost::bind(ShowProgress, this, _1, _2, _3));
 #ifdef ENABLE_WALLET
-    m_handler_load_wallet = m_node.handleLoadWallet([this](std::unique_ptr<interface::Wallet> wallet) { ConnectWallet(std::move(wallet)); });
+    m_handler_load_wallet = m_node.handleLoadWallet([this](std::unique_ptr<interfaces::Wallet> wallet) { ConnectWallet(std::move(wallet)); });
 #endif
 }
 
diff --git a/src/qt/splashscreen.h b/src/qt/splashscreen.h
index 419f36f6418..9ef19675d82 100644
--- a/src/qt/splashscreen.h
+++ b/src/qt/splashscreen.h
@@ -12,7 +12,7 @@
 
 class NetworkStyle;
 
-namespace interface {
+namespace interfaces {
 class Handler;
 class Node;
 class Wallet;
@@ -29,7 +29,7 @@ class SplashScreen : public QWidget
     Q_OBJECT
 
 public:
-    explicit SplashScreen(interface::Node& node, Qt::WindowFlags f, const NetworkStyle *networkStyle);
+    explicit SplashScreen(interfaces::Node& node, Qt::WindowFlags f, const NetworkStyle *networkStyle);
     ~SplashScreen();
 
 protected:
@@ -52,19 +52,19 @@ private:
     /** Disconnect core signals to splash screen */
     void unsubscribeFromCoreSignals();
     /** Connect wallet signals to splash screen */
-    void ConnectWallet(std::unique_ptr<interface::Wallet> wallet);
+    void ConnectWallet(std::unique_ptr<interfaces::Wallet> wallet);
 
     QPixmap pixmap;
     QString curMessage;
     QColor curColor;
     int curAlignment;
 
-    interface::Node& m_node;
-    std::unique_ptr<interface::Handler> m_handler_init_message;
-    std::unique_ptr<interface::Handler> m_handler_show_progress;
-    std::unique_ptr<interface::Handler> m_handler_load_wallet;
-    std::list<std::unique_ptr<interface::Wallet>> m_connected_wallets;
-    std::list<std::unique_ptr<interface::Handler>> m_connected_wallet_handlers;
+    interfaces::Node& m_node;
+    std::unique_ptr<interfaces::Handler> m_handler_init_message;
+    std::unique_ptr<interfaces::Handler> m_handler_show_progress;
+    std::unique_ptr<interfaces::Handler> m_handler_load_wallet;
+    std::list<std::unique_ptr<interfaces::Wallet>> m_connected_wallets;
+    std::list<std::unique_ptr<interfaces::Handler>> m_connected_wallet_handlers;
 };
 
 #endif // BITCOIN_QT_SPLASHSCREEN_H
diff --git a/src/qt/test/paymentservertests.cpp b/src/qt/test/paymentservertests.cpp
index 46e9d4d0a4c..83484b5ce70 100644
--- a/src/qt/test/paymentservertests.cpp
+++ b/src/qt/test/paymentservertests.cpp
@@ -9,7 +9,7 @@
 
 #include <amount.h>
 #include <chainparams.h>
-#include <interface/node.h>
+#include <interfaces/node.h>
 #include <random.h>
 #include <script/script.h>
 #include <script/standard.h>
@@ -67,7 +67,7 @@ static SendCoinsRecipient handleRequest(PaymentServer* server, std::vector<unsig
 void PaymentServerTests::paymentServerTests()
 {
     SelectParams(CBaseChainParams::MAIN);
-    auto node = interface::MakeNode();
+    auto node = interfaces::MakeNode();
     OptionsModel optionsModel(*node);
     PaymentServer* server = new PaymentServer(nullptr, false);
     X509_STORE* caStore = X509_STORE_new();
diff --git a/src/qt/test/rpcnestedtests.cpp b/src/qt/test/rpcnestedtests.cpp
index 467107dc4c4..974e7831c45 100644
--- a/src/qt/test/rpcnestedtests.cpp
+++ b/src/qt/test/rpcnestedtests.cpp
@@ -7,7 +7,7 @@
 #include <chainparams.h>
 #include <consensus/validation.h>
 #include <fs.h>
-#include <interface/node.h>
+#include <interfaces/node.h>
 #include <validation.h>
 #include <rpc/register.h>
 #include <rpc/server.h>
@@ -46,7 +46,7 @@ void RPCNestedTests::rpcNestedTests()
     std::string result;
     std::string result2;
     std::string filtered;
-    auto node = interface::MakeNode();
+    auto node = interfaces::MakeNode();
     RPCConsole::RPCExecuteCommandLine(*node, result, "getblockchaininfo()[chain]", &filtered); //simple result filtering with path
     QVERIFY(result=="main");
     QVERIFY(filtered == "getblockchaininfo()[chain]");
diff --git a/src/qt/test/wallettests.cpp b/src/qt/test/wallettests.cpp
index b60c5b979f8..fb86cf5ec97 100644
--- a/src/qt/test/wallettests.cpp
+++ b/src/qt/test/wallettests.cpp
@@ -1,6 +1,6 @@
 #include <qt/test/wallettests.h>
 
-#include <interface/node.h>
+#include <interfaces/node.h>
 #include <qt/bitcoinamountfield.h>
 #include <qt/callback.h>
 #include <qt/optionsmodel.h>
@@ -178,7 +178,7 @@ void TestGUI()
     std::unique_ptr<const PlatformStyle> platformStyle(PlatformStyle::instantiate("other"));
     SendCoinsDialog sendCoinsDialog(platformStyle.get());
     TransactionView transactionView(platformStyle.get());
-    auto node = interface::MakeNode();
+    auto node = interfaces::MakeNode();
     OptionsModel optionsModel(*node);
     vpwallets.insert(vpwallets.begin(), &wallet);
     WalletModel walletModel(std::move(node->getWallets()[0]), *node, platformStyle.get(), &optionsModel);
diff --git a/src/qt/trafficgraphwidget.cpp b/src/qt/trafficgraphwidget.cpp
index ff378ed1bfb..5a3b645f651 100644
--- a/src/qt/trafficgraphwidget.cpp
+++ b/src/qt/trafficgraphwidget.cpp
@@ -2,7 +2,7 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#include <interface/node.h>
+#include <interfaces/node.h>
 #include <qt/trafficgraphwidget.h>
 #include <qt/clientmodel.h>
 
diff --git a/src/qt/transactiondesc.cpp b/src/qt/transactiondesc.cpp
index 409835592f7..f316c3ca452 100644
--- a/src/qt/transactiondesc.cpp
+++ b/src/qt/transactiondesc.cpp
@@ -10,7 +10,7 @@
 #include <qt/transactionrecord.h>
 
 #include <consensus/consensus.h>
-#include <interface/node.h>
+#include <interfaces/node.h>
 #include <key_io.h>
 #include <validation.h>
 #include <script/script.h>
@@ -23,7 +23,7 @@
 #include <stdint.h>
 #include <string>
 
-QString TransactionDesc::FormatTxStatus(const interface::WalletTx& wtx, const interface::WalletTxStatus& status, bool inMempool, int numBlocks, int64_t adjustedTime)
+QString TransactionDesc::FormatTxStatus(const interfaces::WalletTx& wtx, const interfaces::WalletTxStatus& status, bool inMempool, int numBlocks, int64_t adjustedTime)
 {
     if (!status.is_final)
     {
@@ -48,14 +48,14 @@ QString TransactionDesc::FormatTxStatus(const interface::WalletTx& wtx, const in
     }
 }
 
-QString TransactionDesc::toHTML(interface::Node& node, interface::Wallet& wallet, TransactionRecord *rec, int unit)
+QString TransactionDesc::toHTML(interfaces::Node& node, interfaces::Wallet& wallet, TransactionRecord *rec, int unit)
 {
     int numBlocks;
     int64_t adjustedTime;
-    interface::WalletTxStatus status;
-    interface::WalletOrderForm orderForm;
+    interfaces::WalletTxStatus status;
+    interfaces::WalletOrderForm orderForm;
     bool inMempool;
-    interface::WalletTx wtx = wallet.getWalletTxDetails(rec->hash, status, orderForm, inMempool, numBlocks, adjustedTime);
+    interfaces::WalletTx wtx = wallet.getWalletTxDetails(rec->hash, status, orderForm, inMempool, numBlocks, adjustedTime);
 
     QString strHTML;
 
diff --git a/src/qt/transactiondesc.h b/src/qt/transactiondesc.h
index ea9ab28ee39..cb8453cb81e 100644
--- a/src/qt/transactiondesc.h
+++ b/src/qt/transactiondesc.h
@@ -10,7 +10,7 @@
 
 class TransactionRecord;
 
-namespace interface {
+namespace interfaces {
 class Node;
 class Wallet;
 struct WalletTx;
@@ -24,12 +24,12 @@ class TransactionDesc: public QObject
     Q_OBJECT
 
 public:
-    static QString toHTML(interface::Node& node, interface::Wallet& wallet, TransactionRecord *rec, int unit);
+    static QString toHTML(interfaces::Node& node, interfaces::Wallet& wallet, TransactionRecord *rec, int unit);
 
 private:
     TransactionDesc() {}
 
-    static QString FormatTxStatus(const interface::WalletTx& wtx, const interface::WalletTxStatus& status, bool inMempool, int numBlocks, int64_t adjustedTime);
+    static QString FormatTxStatus(const interfaces::WalletTx& wtx, const interfaces::WalletTxStatus& status, bool inMempool, int numBlocks, int64_t adjustedTime);
 };
 
 #endif // BITCOIN_QT_TRANSACTIONDESC_H
diff --git a/src/qt/transactionrecord.cpp b/src/qt/transactionrecord.cpp
index 60ab2d57d75..b6ed66ad96e 100644
--- a/src/qt/transactionrecord.cpp
+++ b/src/qt/transactionrecord.cpp
@@ -5,7 +5,7 @@
 #include <qt/transactionrecord.h>
 
 #include <consensus/consensus.h>
-#include <interface/wallet.h>
+#include <interfaces/wallet.h>
 #include <key_io.h>
 #include <timedata.h>
 #include <validation.h>
@@ -25,7 +25,7 @@ bool TransactionRecord::showTransaction()
 /*
  * Decompose CWallet transaction to model transaction records.
  */
-QList<TransactionRecord> TransactionRecord::decomposeTransaction(const interface::WalletTx& wtx)
+QList<TransactionRecord> TransactionRecord::decomposeTransaction(const interfaces::WalletTx& wtx)
 {
     QList<TransactionRecord> parts;
     int64_t nTime = wtx.time;
@@ -158,7 +158,7 @@ QList<TransactionRecord> TransactionRecord::decomposeTransaction(const interface
     return parts;
 }
 
-void TransactionRecord::updateStatus(const interface::WalletTxStatus& wtx, int numBlocks, int64_t adjustedTime)
+void TransactionRecord::updateStatus(const interfaces::WalletTxStatus& wtx, int numBlocks, int64_t adjustedTime)
 {
     // Determine transaction status
 
diff --git a/src/qt/transactionrecord.h b/src/qt/transactionrecord.h
index c653584b523..62961434edb 100644
--- a/src/qt/transactionrecord.h
+++ b/src/qt/transactionrecord.h
@@ -11,7 +11,7 @@
 #include <QList>
 #include <QString>
 
-namespace interface {
+namespace interfaces {
 class Node;
 class Wallet;
 struct WalletTx;
@@ -111,7 +111,7 @@ public:
     /** Decompose CWallet transaction to model transaction records.
      */
     static bool showTransaction();
-    static QList<TransactionRecord> decomposeTransaction(const interface::WalletTx& wtx);
+    static QList<TransactionRecord> decomposeTransaction(const interfaces::WalletTx& wtx);
 
     /** @name Immutable transaction attributes
       @{*/
@@ -140,7 +140,7 @@ public:
 
     /** Update status from core wallet tx.
      */
-    void updateStatus(const interface::WalletTxStatus& wtx, int numBlocks, int64_t adjustedTime);
+    void updateStatus(const interfaces::WalletTxStatus& wtx, int numBlocks, int64_t adjustedTime);
 
     /** Return whether a status update is needed.
      */
diff --git a/src/qt/transactiontablemodel.cpp b/src/qt/transactiontablemodel.cpp
index 2148ff17286..46169a91d14 100644
--- a/src/qt/transactiontablemodel.cpp
+++ b/src/qt/transactiontablemodel.cpp
@@ -14,8 +14,8 @@
 #include <qt/walletmodel.h>
 
 #include <core_io.h>
-#include <interface/handler.h>
-#include <interface/node.h>
+#include <interfaces/handler.h>
+#include <interfaces/node.h>
 #include <validation.h>
 #include <sync.h>
 #include <uint256.h>
@@ -73,7 +73,7 @@ public:
 
     /* Query entire wallet anew from core.
      */
-    void refreshWallet(interface::Wallet& wallet)
+    void refreshWallet(interfaces::Wallet& wallet)
     {
         qDebug() << "TransactionTablePriv::refreshWallet";
         cachedWallet.clear();
@@ -91,7 +91,7 @@ public:
 
        Call with transaction that was added, removed or changed.
      */
-    void updateWallet(interface::Wallet& wallet, const uint256 &hash, int status, bool showTransaction)
+    void updateWallet(interfaces::Wallet& wallet, const uint256 &hash, int status, bool showTransaction)
     {
         qDebug() << "TransactionTablePriv::updateWallet: " + QString::fromStdString(hash.ToString()) + " " + QString::number(status);
 
@@ -127,7 +127,7 @@ public:
             if(showTransaction)
             {
                 // Find transaction in wallet
-                interface::WalletTx wtx = wallet.getWalletTx(hash);
+                interfaces::WalletTx wtx = wallet.getWalletTx(hash);
                 if(!wtx.tx)
                 {
                     qWarning() << "TransactionTablePriv::updateWallet: Warning: Got CT_NEW, but transaction is not in wallet";
@@ -176,7 +176,7 @@ public:
         return cachedWallet.size();
     }
 
-    TransactionRecord *index(interface::Wallet& wallet, int idx)
+    TransactionRecord *index(interfaces::Wallet& wallet, int idx)
     {
         if(idx >= 0 && idx < cachedWallet.size())
         {
@@ -189,7 +189,7 @@ public:
             // If a status update is needed (blocks came in since last check),
             //  update the status of this transaction from the wallet. Otherwise,
             // simply re-use the cached status.
-            interface::WalletTxStatus wtx;
+            interfaces::WalletTxStatus wtx;
             int numBlocks;
             int64_t adjustedTime;
             if (wallet.tryGetTxStatus(rec->hash, wtx, numBlocks, adjustedTime) && rec->statusUpdateNeeded(numBlocks)) {
@@ -200,12 +200,12 @@ public:
         return 0;
     }
 
-    QString describe(interface::Node& node, interface::Wallet& wallet, TransactionRecord *rec, int unit)
+    QString describe(interfaces::Node& node, interfaces::Wallet& wallet, TransactionRecord *rec, int unit)
     {
         return TransactionDesc::toHTML(node, wallet, rec, unit);
     }
 
-    QString getTxHex(interface::Wallet& wallet, TransactionRecord *rec)
+    QString getTxHex(interfaces::Wallet& wallet, TransactionRecord *rec)
     {
         auto tx = wallet.getTx(rec->hash);
         if (tx) {
diff --git a/src/qt/transactiontablemodel.h b/src/qt/transactiontablemodel.h
index 57566db638c..8b029be5f54 100644
--- a/src/qt/transactiontablemodel.h
+++ b/src/qt/transactiontablemodel.h
@@ -12,7 +12,7 @@
 
 #include <memory>
 
-namespace interface {
+namespace interfaces {
 class Handler;
 }
 
@@ -85,8 +85,8 @@ public:
 
 private:
     WalletModel *walletModel;
-    std::unique_ptr<interface::Handler> m_handler_transaction_changed;
-    std::unique_ptr<interface::Handler> m_handler_show_progress;
+    std::unique_ptr<interfaces::Handler> m_handler_transaction_changed;
+    std::unique_ptr<interfaces::Handler> m_handler_show_progress;
     QStringList columns;
     TransactionTablePriv *priv;
     bool fProcessingQueuedTransactions;
diff --git a/src/qt/utilitydialog.cpp b/src/qt/utilitydialog.cpp
index 6114ea0de12..d5b98486ae5 100644
--- a/src/qt/utilitydialog.cpp
+++ b/src/qt/utilitydialog.cpp
@@ -19,7 +19,7 @@
 
 #include <clientversion.h>
 #include <init.h>
-#include <interface/node.h>
+#include <interfaces/node.h>
 #include <util.h>
 
 #include <stdio.h>
@@ -32,7 +32,7 @@
 #include <QVBoxLayout>
 
 /** "Help message" or "About" dialog box */
-HelpMessageDialog::HelpMessageDialog(interface::Node& node, QWidget *parent, bool about) :
+HelpMessageDialog::HelpMessageDialog(interfaces::Node& node, QWidget *parent, bool about) :
     QDialog(parent),
     ui(new Ui::HelpMessageDialog)
 {
diff --git a/src/qt/utilitydialog.h b/src/qt/utilitydialog.h
index e6ad7be5d08..f5c8af43626 100644
--- a/src/qt/utilitydialog.h
+++ b/src/qt/utilitydialog.h
@@ -10,7 +10,7 @@
 
 class BitcoinGUI;
 
-namespace interface {
+namespace interfaces {
     class Node;
 }
 
@@ -24,7 +24,7 @@ class HelpMessageDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit HelpMessageDialog(interface::Node& node, QWidget *parent, bool about);
+    explicit HelpMessageDialog(interfaces::Node& node, QWidget *parent, bool about);
     ~HelpMessageDialog();
 
     void printToConsole();
diff --git a/src/qt/walletmodel.cpp b/src/qt/walletmodel.cpp
index d9db437dc5f..00b98901c09 100644
--- a/src/qt/walletmodel.cpp
+++ b/src/qt/walletmodel.cpp
@@ -12,8 +12,8 @@
 #include <qt/sendcoinsdialog.h>
 #include <qt/transactiontablemodel.h>
 
-#include <interface/handler.h>
-#include <interface/node.h>
+#include <interfaces/handler.h>
+#include <interfaces/node.h>
 #include <key_io.h>
 #include <ui_interface.h>
 #include <util.h> // for GetBoolArg
@@ -28,7 +28,7 @@
 #include <QTimer>
 
 
-WalletModel::WalletModel(std::unique_ptr<interface::Wallet> wallet, interface::Node& node, const PlatformStyle *platformStyle, OptionsModel *_optionsModel, QObject *parent) :
+WalletModel::WalletModel(std::unique_ptr<interfaces::Wallet> wallet, interfaces::Node& node, const PlatformStyle *platformStyle, OptionsModel *_optionsModel, QObject *parent) :
     QObject(parent), m_wallet(std::move(wallet)), m_node(node), optionsModel(_optionsModel), addressTableModel(0),
     transactionTableModel(0),
     recentRequestsTableModel(0),
@@ -70,7 +70,7 @@ void WalletModel::pollBalanceChanged()
     // avoids the GUI from getting stuck on periodical polls if the core is
     // holding the locks for a longer time - for example, during a wallet
     // rescan.
-    interface::WalletBalances new_balances;
+    interfaces::WalletBalances new_balances;
     int numBlocks = -1;
     if (!m_wallet->tryGetBalances(new_balances, numBlocks)) {
         return;
@@ -89,7 +89,7 @@ void WalletModel::pollBalanceChanged()
     }
 }
 
-void WalletModel::checkBalanceChanged(const interface::WalletBalances& new_balances)
+void WalletModel::checkBalanceChanged(const interfaces::WalletBalances& new_balances)
 {
     if(new_balances.balanceChanged(m_cached_balances)) {
         m_cached_balances = new_balances;
diff --git a/src/qt/walletmodel.h b/src/qt/walletmodel.h
index bc409b10eea..e5ed5b4e82b 100644
--- a/src/qt/walletmodel.h
+++ b/src/qt/walletmodel.h
@@ -13,7 +13,7 @@
 #include <qt/paymentrequestplus.h>
 #include <qt/walletmodeltransaction.h>
 
-#include <interface/wallet.h>
+#include <interfaces/wallet.h>
 #include <support/allocators/secure.h>
 
 #include <map>
@@ -37,9 +37,9 @@ class COutput;
 class CPubKey;
 class uint256;
 
-namespace interface {
+namespace interfaces {
 class Node;
-} // namespace interface
+} // namespace interfaces
 
 QT_BEGIN_NAMESPACE
 class QTimer;
@@ -111,7 +111,7 @@ class WalletModel : public QObject
     Q_OBJECT
 
 public:
-    explicit WalletModel(std::unique_ptr<interface::Wallet> wallet, interface::Node& node, const PlatformStyle *platformStyle, OptionsModel *optionsModel, QObject *parent = 0);
+    explicit WalletModel(std::unique_ptr<interfaces::Wallet> wallet, interfaces::Node& node, const PlatformStyle *platformStyle, OptionsModel *optionsModel, QObject *parent = 0);
     ~WalletModel();
 
     enum StatusCode // Returned by sendCoins
@@ -198,20 +198,20 @@ public:
 
     static bool isWalletEnabled();
 
-    interface::Node& node() const { return m_node; }
-    interface::Wallet& wallet() const { return *m_wallet; }
+    interfaces::Node& node() const { return m_node; }
+    interfaces::Wallet& wallet() const { return *m_wallet; }
 
     QString getWalletName() const;
 
     bool isMultiwallet();
 private:
-    std::unique_ptr<interface::Wallet> m_wallet;
-    std::unique_ptr<interface::Handler> m_handler_status_changed;
-    std::unique_ptr<interface::Handler> m_handler_address_book_changed;
-    std::unique_ptr<interface::Handler> m_handler_transaction_changed;
-    std::unique_ptr<interface::Handler> m_handler_show_progress;
-    std::unique_ptr<interface::Handler> m_handler_watch_only_changed;
-    interface::Node& m_node;
+    std::unique_ptr<interfaces::Wallet> m_wallet;
+    std::unique_ptr<interfaces::Handler> m_handler_status_changed;
+    std::unique_ptr<interfaces::Handler> m_handler_address_book_changed;
+    std::unique_ptr<interfaces::Handler> m_handler_transaction_changed;
+    std::unique_ptr<interfaces::Handler> m_handler_show_progress;
+    std::unique_ptr<interfaces::Handler> m_handler_watch_only_changed;
+    interfaces::Node& m_node;
 
     bool fHaveWatchOnly;
     bool fForceCheckBalanceChanged;
@@ -225,7 +225,7 @@ private:
     RecentRequestsTableModel *recentRequestsTableModel;
 
     // Cache some values to be able to detect changes
-    interface::WalletBalances m_cached_balances;
+    interfaces::WalletBalances m_cached_balances;
     EncryptionStatus cachedEncryptionStatus;
     int cachedNumBlocks;
 
@@ -233,11 +233,11 @@ private:
 
     void subscribeToCoreSignals();
     void unsubscribeFromCoreSignals();
-    void checkBalanceChanged(const interface::WalletBalances& new_balances);
+    void checkBalanceChanged(const interfaces::WalletBalances& new_balances);
 
 Q_SIGNALS:
     // Signal that balance in wallet changed
-    void balanceChanged(const interface::WalletBalances& balances);
+    void balanceChanged(const interfaces::WalletBalances& balances);
 
     // Encryption status of wallet changed
     void encryptionStatusChanged();
diff --git a/src/qt/walletmodeltransaction.cpp b/src/qt/walletmodeltransaction.cpp
index 21bdfe38180..d5187d6634e 100644
--- a/src/qt/walletmodeltransaction.cpp
+++ b/src/qt/walletmodeltransaction.cpp
@@ -4,7 +4,7 @@
 
 #include <qt/walletmodeltransaction.h>
 
-#include <interface/node.h>
+#include <interfaces/node.h>
 #include <policy/policy.h>
 
 WalletModelTransaction::WalletModelTransaction(const QList<SendCoinsRecipient> &_recipients) :
@@ -18,7 +18,7 @@ QList<SendCoinsRecipient> WalletModelTransaction::getRecipients() const
     return recipients;
 }
 
-std::unique_ptr<interface::PendingWalletTx>& WalletModelTransaction::getWtx()
+std::unique_ptr<interfaces::PendingWalletTx>& WalletModelTransaction::getWtx()
 {
     return wtx;
 }
diff --git a/src/qt/walletmodeltransaction.h b/src/qt/walletmodeltransaction.h
index 32fd0d21102..9f913261099 100644
--- a/src/qt/walletmodeltransaction.h
+++ b/src/qt/walletmodeltransaction.h
@@ -13,7 +13,7 @@
 
 class SendCoinsRecipient;
 
-namespace interface {
+namespace interfaces {
 class Node;
 class PendingWalletTx;
 }
@@ -26,7 +26,7 @@ public:
 
     QList<SendCoinsRecipient> getRecipients() const;
 
-    std::unique_ptr<interface::PendingWalletTx>& getWtx();
+    std::unique_ptr<interfaces::PendingWalletTx>& getWtx();
     unsigned int getTransactionSize();
 
     void setTransactionFee(const CAmount& newFee);
@@ -38,7 +38,7 @@ public:
 
 private:
     QList<SendCoinsRecipient> recipients;
-    std::unique_ptr<interface::PendingWalletTx> wtx;
+    std::unique_ptr<interfaces::PendingWalletTx> wtx;
     CAmount fee;
 };
 
diff --git a/src/qt/walletview.cpp b/src/qt/walletview.cpp
index 1505557244b..8b9b85c8c94 100644
--- a/src/qt/walletview.cpp
+++ b/src/qt/walletview.cpp
@@ -19,7 +19,7 @@
 #include <qt/transactionview.h>
 #include <qt/walletmodel.h>
 
-#include <interface/node.h>
+#include <interfaces/node.h>
 #include <ui_interface.h>
 
 #include <QAction>