Deniability - a tool to automatically improve coin ownership privacy

src/interfaces/wallet.h

@@ -158,6 +158,16 @@ class Wallet
         WalletValueMap value_map,
         WalletOrderForm order_form) = 0;
 
+    virtual std::pair<unsigned int, bool> calculateDeniabilizationCycles(const COutPoint& outpoint) = 0;
+
+    virtual util::Result<CTransactionRef> createDeniabilizationTransaction(const std::set<COutPoint>& inputs,
+                                                                           const std::optional<OutputType>& opt_output_type,
+                                                                           unsigned int confirm_target,
+                                                                           unsigned int deniabilization_cycles,
+                                                                           bool sign,
+                                                                           bool& insufficient_amount,
+                                                                           CAmount& fee) = 0;
+
     //! Return whether transaction can be abandoned.
     virtual bool transactionCanBeAbandoned(const uint256& txid) = 0;
 
@@ -184,6 +194,13 @@ class Wallet
         std::vector<bilingual_str>& errors,
         uint256& bumped_txid) = 0;
 
+    //! Create a fee bump transaction for a deniabilization transaction
+    virtual util::Result<CTransactionRef> createBumpDeniabilizationTransaction(const uint256& txid,
+                                                                               unsigned int confirm_target,
+                                                                               bool sign,
+                                                                               CAmount& old_fee,
+                                                                               CAmount& new_fee) = 0;
+
     //! Get a transaction.
     virtual CTransactionRef getTx(const uint256& txid) = 0;
 
@@ -255,6 +272,9 @@ class Wallet
         int* returned_target,
         FeeReason* reason) = 0;
 
+    //! Get the fee rate for deniabilization
+    virtual CFeeRate getDeniabilizationFeeRate(unsigned int confirm_target) = 0;
+
     //! Get tx confirm target.
     virtual unsigned int getConfirmTarget() = 0;
 

src/qt/CMakeLists.txt

@@ -154,6 +154,8 @@ if(ENABLE_WALLET)
       coincontroltreewidget.h
       createwalletdialog.cpp
       createwalletdialog.h
+      deniabilitydialog.cpp
+      deniabilitydialog.h
       editaddressdialog.cpp
       editaddressdialog.h
       openuridialog.cpp

src/qt/bitcoin.qrc

@@ -44,6 +44,7 @@
         <file alias="hd_disabled">res/icons/hd_disabled.png</file>
         <file alias="network_disabled">res/icons/network_disabled.png</file>
         <file alias="proxy">res/icons/proxy.png</file>
+        <file alias="crosseye">res/icons/crosseye.png</file>
     </qresource>
     <qresource prefix="/animation">
         <file alias="spinner-000">res/animation/spinner-000.png</file>

src/qt/bitcoingui.cpp

@@ -277,6 +277,13 @@ void BitcoinGUI::createActions()
     historyAction->setShortcut(QKeySequence(QStringLiteral("Alt+4")));
     tabGroup->addAction(historyAction);
 
+    deniabilityAction = new QAction(platformStyle->SingleColorIcon(":/icons/crosseye"), tr("&Deniability"), this);
+    deniabilityAction->setStatusTip(tr("Improve coin ownership privacy"));
+    deniabilityAction->setToolTip(deniabilityAction->statusTip());
+    deniabilityAction->setCheckable(true);
+    deniabilityAction->setShortcut(QKeySequence(QStringLiteral("Alt+5")));
+    tabGroup->addAction(deniabilityAction);
+
 #ifdef ENABLE_WALLET
     // These showNormalIfMinimized are needed because Send Coins and Receive Coins
     // can be triggered from the tray menu, and need to show the GUI to be useful.
@@ -288,6 +295,8 @@ void BitcoinGUI::createActions()
     connect(receiveCoinsAction, &QAction::triggered, this, &BitcoinGUI::gotoReceiveCoinsPage);
     connect(historyAction, &QAction::triggered, [this]{ showNormalIfMinimized(); });
     connect(historyAction, &QAction::triggered, this, &BitcoinGUI::gotoHistoryPage);
+    connect(deniabilityAction, &QAction::triggered, [this] { showNormalIfMinimized(); });
+    connect(deniabilityAction, &QAction::triggered, this, &BitcoinGUI::gotoDeniabilityPage);
 #endif // ENABLE_WALLET
 
     quitAction = new QAction(tr("E&xit"), this);
@@ -597,6 +606,7 @@ void BitcoinGUI::createToolBars()
         toolbar->addAction(sendCoinsAction);
         toolbar->addAction(receiveCoinsAction);
         toolbar->addAction(historyAction);
+        toolbar->addAction(deniabilityAction);
         overviewAction->setChecked(true);
 
 #ifdef ENABLE_WALLET
@@ -818,6 +828,7 @@ void BitcoinGUI::setWalletActionsEnabled(bool enabled)
     sendCoinsAction->setEnabled(enabled);
     receiveCoinsAction->setEnabled(enabled);
     historyAction->setEnabled(enabled);
+    deniabilityAction->setEnabled(enabled);
     encryptWalletAction->setEnabled(enabled);
     backupWalletAction->setEnabled(enabled);
     changePassphraseAction->setEnabled(enabled);
@@ -979,6 +990,12 @@ void BitcoinGUI::gotoHistoryPage()
     if (walletFrame) walletFrame->gotoHistoryPage();
 }
 
+void BitcoinGUI::gotoDeniabilityPage()
+{
+    deniabilityAction->setChecked(true);
+    if (walletFrame) walletFrame->gotoDeniabilityPage();
+}
+
 void BitcoinGUI::gotoReceiveCoinsPage()
 {
     receiveCoinsAction->setChecked(true);
@@ -1294,6 +1311,7 @@ void BitcoinGUI::changeEvent(QEvent *e)
         sendCoinsAction->setIcon(platformStyle->SingleColorIcon(QStringLiteral(":/icons/send")));
         receiveCoinsAction->setIcon(platformStyle->SingleColorIcon(QStringLiteral(":/icons/receiving_addresses")));
         historyAction->setIcon(platformStyle->SingleColorIcon(QStringLiteral(":/icons/history")));
+        deniabilityAction->setIcon(platformStyle->SingleColorIcon(QStringLiteral(":/icons/crosseye")));
     }
 
     QMainWindow::changeEvent(e);

src/qt/bitcoingui.h

@@ -134,6 +134,7 @@ class BitcoinGUI : public QMainWindow
     QToolBar* appToolBar = nullptr;
     QAction* overviewAction = nullptr;
     QAction* historyAction = nullptr;
+    QAction* deniabilityAction = nullptr;
     QAction* quitAction = nullptr;
     QAction* sendCoinsAction = nullptr;
     QAction* usedSendingAddressesAction = nullptr;
@@ -279,6 +280,8 @@ public Q_SLOTS:
     void gotoOverviewPage();
     /** Switch to history (transactions) page */
     void gotoHistoryPage();
+    /** Switch to deniability (ownership obfuscation) page */
+    void gotoDeniabilityPage();
     /** Switch to receive coins page */
     void gotoReceiveCoinsPage();
     /** Switch to send coins page */