diff --git a/src/qt/coincontroldialog.cpp b/src/qt/coincontroldialog.cpp
--- a/src/qt/coincontroldialog.cpp
+++ b/src/qt/coincontroldialog.cpp
@@ -233,12 +233,14 @@
         // disable some items (like Copy Transaction ID, lock, unlock) for tree
         // roots in context menu
         if (item->text(COLUMN_TXHASH).length() == 64) {
+            TxId txid;
+            txid.SetHex(item->text(COLUMN_TXHASH).toStdString());
+
             // transaction hash is 64 characters (this means its a child node,
             // so its not a parent node in tree mode)
             copyTransactionHashAction->setEnabled(true);
-            if (model->isLockedCoin(
-                    uint256S(item->text(COLUMN_TXHASH).toStdString()),
-                    item->text(COLUMN_VOUT_INDEX).toUInt())) {
+            if (model->isLockedCoin(txid,
+                                    item->text(COLUMN_VOUT_INDEX).toUInt())) {
                 lockAction->setEnabled(false);
                 unlockAction->setEnabled(true);
             } else {
@@ -267,10 +269,11 @@
 void CoinControlDialog::copyLabel() {
     if (ui->radioTreeMode->isChecked() &&
         contextMenuItem->text(COLUMN_LABEL).length() == 0 &&
-        contextMenuItem->parent())
+        contextMenuItem->parent()) {
         GUIUtil::setClipboard(contextMenuItem->parent()->text(COLUMN_LABEL));
-    else
+    } else {
         GUIUtil::setClipboard(contextMenuItem->text(COLUMN_LABEL));
+    }
 }
 
 // context menu action: copy address
@@ -793,17 +796,17 @@
             itemOutput->setData(COLUMN_CONFIRMATIONS, Qt::UserRole,
                                 QVariant((qlonglong)out.nDepth));
 
-            // transaction hash
-            uint256 txhash = out.tx->GetId();
+            // transaction id
+            const TxId txid = out.tx->GetId();
             itemOutput->setText(COLUMN_TXHASH,
-                                QString::fromStdString(txhash.GetHex()));
+                                QString::fromStdString(txid.GetHex()));
 
             // vout index
             itemOutput->setText(COLUMN_VOUT_INDEX, QString::number(out.i));
 
             // disable locked coins
-            if (model->isLockedCoin(txhash, out.i)) {
-                COutPoint outpt(txhash, out.i);
+            if (model->isLockedCoin(txid, out.i)) {
+                COutPoint outpt(txid, out.i);
                 // just to be sure
                 coinControl->UnSelect(outpt);
                 itemOutput->setDisabled(true);
@@ -813,7 +816,7 @@
             }
 
             // set checkbox
-            if (coinControl->IsSelected(COutPoint(txhash, out.i))) {
+            if (coinControl->IsSelected(COutPoint(txid, out.i))) {
                 itemOutput->setCheckState(COLUMN_CHECKBOX, Qt::Checked);
             }
         }
diff --git a/src/qt/walletmodel.h b/src/qt/walletmodel.h
--- a/src/qt/walletmodel.h
+++ b/src/qt/walletmodel.h
@@ -213,7 +213,7 @@
     bool isSpent(const COutPoint &outpoint) const;
     void listCoins(std::map<QString, std::vector<COutput>> &mapCoins) const;
 
-    bool isLockedCoin(uint256 hash, unsigned int n) const;
+    bool isLockedCoin(const TxId &txid, uint32_t n) const;
     void lockCoin(COutPoint &output);
     void unlockCoin(COutPoint &output);
     void listLockedCoins(std::vector<COutPoint> &vOutpts);
diff --git a/src/qt/walletmodel.cpp b/src/qt/walletmodel.cpp
--- a/src/qt/walletmodel.cpp
+++ b/src/qt/walletmodel.cpp
@@ -627,9 +627,9 @@
     }
 }
 
-bool WalletModel::isLockedCoin(uint256 hash, unsigned int n) const {
+bool WalletModel::isLockedCoin(const TxId &txid, uint32_t n) const {
     LOCK2(cs_main, wallet->cs_wallet);
-    return wallet->IsLockedCoin(hash, n);
+    return wallet->IsLockedCoin(txid, n);
 }
 
 void WalletModel::lockCoin(COutPoint &output) {
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -788,7 +788,7 @@
 
     bool IsSpent(const TxId &txid, uint32_t n) const;
 
-    bool IsLockedCoin(uint256 hash, unsigned int n) const;
+    bool IsLockedCoin(const TxId &txid, uint32_t n) const;
     void LockCoin(const COutPoint &output);
     void UnlockCoin(const COutPoint &output);
     void UnlockAllCoins();
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -3808,10 +3808,10 @@
     setLockedCoins.clear();
 }
 
-bool CWallet::IsLockedCoin(uint256 hash, unsigned int n) const {
+bool CWallet::IsLockedCoin(const TxId &txid, uint32_t n) const {
     // setLockedCoins
     AssertLockHeld(cs_wallet);
-    COutPoint outpt(hash, n);
+    COutPoint outpt(txid, n);
 
     return setLockedCoins.count(outpt) > 0;
 }