Add post-quantum address selector to desktop wallet

configure.ac

@@ -1,7 +1,7 @@
 AC_PREREQ([2.69])
 define(_CLIENT_VERSION_MAJOR, 0)
 define(_CLIENT_VERSION_MINOR, 2)
-define(_CLIENT_VERSION_BUILD, 0)
+define(_CLIENT_VERSION_BUILD, 1)
 define(_CLIENT_VERSION_RC, 1)
 define(_CLIENT_VERSION_IS_RELEASE, true)
 define(_COPYRIGHT_YEAR, 2026)

src/interfaces/wallet.h

@@ -262,6 +262,9 @@ public:
     // Get default address type.
     virtual OutputType getDefaultAddressType() = 0;
 
+    //! Return whether post-quantum consensus rules are active.
+    virtual bool isPostQuantumActive() = 0;
+
     //! Get max tx fee.
     virtual CAmount getDefaultMaxTxFee() = 0;
 

src/qt/forms/receivecoinsdialog.ui

@@ -195,28 +195,25 @@
            </widget>
           </item>
           <item>
-           <widget class="QCheckBox" name="useBech32">
+           <widget class="QComboBox" name="addressType">
-            <property name="sizePolicy">
-             <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
-              <horstretch>0</horstretch>
-              <verstretch>0</verstretch>
-             </sizepolicy>
-            </property>
-            <property name="maximumSize">
-             <size>
-              <width>1000</width>
-              <height>16777215</height>
-             </size>
-            </property>
-            <property name="focusPolicy">
-             <enum>Qt::StrongFocus</enum>
-            </property>
             <property name="toolTip">
-             <string>Native segwit addresses (aka Bech32 or BIP-173) reduce your transaction fees later on and offer better protection against typos, but old wallets don't support them. When unchecked, an address compatible with older wallets will be created instead.</string>
+             <string>Select the type of receiving address to generate.</string>
-            </property>
-            <property name="text">
-             <string>Generate native segwit (Bech32) address</string>
             </property>
+            <item>
+             <property name="text">
+              <string>Standard (vtx1q...)</string>
+             </property>
+            </item>
+            <item>
+             <property name="text">
+              <string>ML-DSA (vtx1z...)</string>
+             </property>
+            </item>
+            <item>
+             <property name="text">
+              <string>SLH-DSA (vtx1r...)</string>
+             </property>
+            </item>
            </widget>
           </item>
           <item>
@@ -366,7 +363,7 @@
  <tabstops>
   <tabstop>reqLabel</tabstop>
   <tabstop>reqAmount</tabstop>
-  <tabstop>useBech32</tabstop>
+  <tabstop>addressType</tabstop>
   <tabstop>reqMessage</tabstop>
   <tabstop>receiveButton</tabstop>
   <tabstop>clearButton</tabstop>

src/qt/receivecoinsdialog.cpp

@@ -9,6 +9,7 @@
 #include <qt/forms/ui_receivecoinsdialog.h>
 
 #include <qt/addresstablemodel.h>
+#include <qt/clientmodel.h>
 #include <qt/guiutil.h>
 #include <qt/optionsmodel.h>
 #include <qt/platformstyle.h>
@@ -21,6 +22,7 @@
 #include <QMessageBox>
 #include <QScrollBar>
 #include <QSettings>
+#include <QStandardItemModel>
 #include <QTextDocument>
 
 ReceiveCoinsDialog::ReceiveCoinsDialog(const PlatformStyle *_platformStyle, QWidget *parent) :
@@ -88,11 +90,15 @@ void ReceiveCoinsDialog::setModel(WalletModel *_model)
             &QItemSelectionModel::selectionChanged, this,
             &ReceiveCoinsDialog::recentRequestsView_selectionChanged);
 
-        if (model->wallet().getDefaultAddressType() == OutputType::BECH32) {
+        // Standard SegWit is the default receiving address type.
-            ui->useBech32->setCheckState(Qt::Checked);
+        ui->addressType->setCurrentIndex(0);
-        } else {
+        updateAddressTypeAvailability();
-            ui->useBech32->setCheckState(Qt::Unchecked);
+
-        }
+        connect(&model->clientModel(), &ClientModel::numBlocksChanged,
+            this,
+            [this](int, const QDateTime&, double, bool, SynchronizationState) {
+                updateAddressTypeAvailability();
+            });
 
         // Set the button to be enabled or disabled based on whether the wallet can give out new addresses.
         ui->receiveButton->setEnabled(model->wallet().canGetAddresses());
@@ -137,6 +143,35 @@ void ReceiveCoinsDialog::updateDisplayUnit()
     }
 }
 
+void ReceiveCoinsDialog::updateAddressTypeAvailability()
+{
+    if (!model) {
+        return;
+    }
+
+    const bool pq_active = model->wallet().isPostQuantumActive();
+
+    auto* item_model = qobject_cast<QStandardItemModel*>(ui->addressType->model());
+    if (!item_model) {
+        return;
+    }
+
+    for (int row : {1, 2}) {
+        if (auto* item = item_model->item(row)) {
+            item->setEnabled(pq_active);
+        }
+    }
+
+    if (!pq_active && ui->addressType->currentIndex() != 0) {
+        ui->addressType->setCurrentIndex(0);
+    }
+
+    ui->addressType->setToolTip(
+        pq_active
+            ? tr("Select the type of receiving address to generate.")
+            : tr("Quantum-resistant address types become available when PQR activates at block 6000."));
+}
+
 void ReceiveCoinsDialog::on_receiveButton_clicked()
 {
     if(!model || !model->getOptionsModel() || !model->getAddressTableModel() || !model->getRecentRequestsTableModel())
@@ -145,14 +180,31 @@ void ReceiveCoinsDialog::on_receiveButton_clicked()
     QString address;
     QString label = ui->reqLabel->text();
     /* Generate new receiving address */
-    OutputType address_type;
+    const int address_type_index = ui->addressType->currentIndex();
-    if (ui->useBech32->isChecked()) {
+
+    if ((address_type_index == 1 || address_type_index == 2) &&
+        !model->wallet().isPostQuantumActive()) {
+        QMessageBox::warning(
+            this,
+            windowTitle(),
+            tr("Quantum-resistant addresses will become available when PQR activates at block 6000."),
+            QMessageBox::Ok,
+            QMessageBox::Ok);
+        return;
+    }
+
+    OutputType address_type = OutputType::BECH32;
+    switch (address_type_index) {
+    case 1:
+        address_type = OutputType::MLDSA;
+        break;
+    case 2:
+        address_type = OutputType::SLHDSA;
+        break;
+    case 0:
+    default:
         address_type = OutputType::BECH32;
-    } else {
+        break;
-        address_type = model->wallet().getDefaultAddressType();
-        if (address_type == OutputType::BECH32) {
-            address_type = OutputType::P2SH_SEGWIT;
-        }
     }
     address = model->getAddressTableModel()->addRow(AddressTableModel::Receive, label, "", address_type);
 

src/qt/receivecoinsdialog.h

@@ -51,6 +51,8 @@ public Q_SLOTS:
     void accept() override;
 
 private:
+    void updateAddressTypeAvailability();
+
     Ui::ReceiveCoinsDialog *ui;
     WalletModel *model;
     QMenu *contextMenu;

src/wallet/interfaces.cpp

@@ -454,6 +454,10 @@ public:
     bool hasExternalSigner() override { return m_wallet->IsWalletFlagSet(WALLET_FLAG_EXTERNAL_SIGNER); }
     bool privateKeysDisabled() override { return m_wallet->IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS); }
     OutputType getDefaultAddressType() override { return m_wallet->m_default_address_type; }
+    bool isPostQuantumActive() override
+    {
+        return m_wallet->chain().isDeploymentActive(Consensus::DEPLOYMENT_PQR);
+    }
     CAmount getDefaultMaxTxFee() override { return m_wallet->m_default_max_tx_fee; }
     void remove() override
     {