diff --git a/app/build.gradle b/app/build.gradle
index 9123227..5a77de5 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -2,15 +2,15 @@ apply plugin: 'com.android.application'
 apply plugin: "androidx.navigation.safeargs"
 
 android {
-    compileSdkVersion 33
+    compileSdkVersion 34
     buildToolsVersion '30.0.3'
     ndkVersion '17.2.4988734'
     defaultConfig {
         applicationId "net.mynero.wallet"
         minSdkVersion 21
-        targetSdkVersion 33
-        versionCode 40302
-        versionName "0.4.3.2 'Fluorine Fermi'"
+        targetSdkVersion 34
+        versionCode 40400
+        versionName "0.4.4 'Fluorine Fermi'"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         externalNativeBuild {
             cmake {
diff --git a/app/src/main/cpp/monerujo.cpp b/app/src/main/cpp/monerujo.cpp
index 7407801..440106a 100644
--- a/app/src/main/cpp/monerujo.cpp
+++ b/app/src/main/cpp/monerujo.cpp
@@ -1135,7 +1135,7 @@ Java_net_mynero_wallet_model_Wallet_getCoinsJ(JNIEnv *env, jobject instance) {
 
 jobject newCoinsInfo(JNIEnv *env, Monero::CoinsInfo *info) {
     jmethodID c = env->GetMethodID(class_CoinsInfo, "<init>",
-                                   "(JZLjava/lang/String;JLjava/lang/String;Ljava/lang/String;ZJ)V");
+                                   "(JZLjava/lang/String;JLjava/lang/String;Ljava/lang/String;ZJZ)V");
     jstring _key_image = env->NewStringUTF(info->keyImage().c_str());
     jstring _pub_key = env->NewStringUTF(info->pubKey().c_str());
     jstring _hash = env->NewStringUTF(info->hash().c_str());
@@ -1147,7 +1147,8 @@ jobject newCoinsInfo(JNIEnv *env, Monero::CoinsInfo *info) {
                                     _hash,
                                     _pub_key,
                                     info->unlocked(),
-                                    static_cast<jlong> (info->internalOutputIndex()));
+                                    static_cast<jlong> (info->internalOutputIndex()),
+                                    info->frozen());
     env->DeleteLocalRef(_key_image);
     env->DeleteLocalRef(_hash);
     env->DeleteLocalRef(_pub_key);
@@ -1183,6 +1184,18 @@ Java_net_mynero_wallet_model_Coins_refreshJ(JNIEnv *env, jobject instance) {
     return coins_cpp2java(env, coins->getAll());
 }
 
+JNIEXPORT void JNICALL
+Java_net_mynero_wallet_model_Coins_setFrozen(JNIEnv *env, jobject instance, jstring publicKey, jboolean frozen) {
+    Monero::Coins *coins = getHandle<Monero::Coins>(env, instance);
+    const char *_publicKey = env->GetStringUTFChars(publicKey, nullptr);
+    if (frozen) {
+        coins->setFrozen(_publicKey);
+    } else {
+        coins->thaw(_publicKey);
+    }
+    env->ReleaseStringUTFChars(publicKey, _publicKey);
+}
+
 //virtual TransactionHistory * history() const = 0;
 JNIEXPORT jlong JNICALL
 Java_net_mynero_wallet_model_Wallet_getHistoryJ(JNIEnv *env, jobject instance) {
diff --git a/app/src/main/java/net/mynero/wallet/adapter/CoinsInfoAdapter.java b/app/src/main/java/net/mynero/wallet/adapter/CoinsInfoAdapter.java
index 2f1f832..cd6546d 100644
--- a/app/src/main/java/net/mynero/wallet/adapter/CoinsInfoAdapter.java
+++ b/app/src/main/java/net/mynero/wallet/adapter/CoinsInfoAdapter.java
@@ -32,11 +32,12 @@ import net.mynero.wallet.util.Constants;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Objects;
 
 public class CoinsInfoAdapter extends RecyclerView.Adapter<CoinsInfoAdapter.ViewHolder> {
 
     private List<CoinsInfo> localDataSet;
-    private List<String> selectedUtxos;
+    private List<CoinsInfo> selectedUtxos;
     private CoinsInfoAdapterListener listener = null;
 
     /**
@@ -48,13 +49,13 @@ public class CoinsInfoAdapter extends RecyclerView.Adapter<CoinsInfoAdapter.View
         this.selectedUtxos = new ArrayList<>();
     }
 
-    public void submitList(List<CoinsInfo> dataSet, List<String> selectedUtxos) {
+    public void submitList(List<CoinsInfo> dataSet, List<CoinsInfo> selectedUtxos) {
         this.localDataSet = dataSet;
         this.selectedUtxos = selectedUtxos;
         notifyDataSetChanged();
     }
 
-    public void updateSelectedUtxos(List<String> selectedUtxos) {
+    public void updateSelectedUtxos(List<CoinsInfo> selectedUtxos) {
         this.selectedUtxos = selectedUtxos;
         notifyDataSetChanged();
     }
@@ -98,8 +99,14 @@ public class CoinsInfoAdapter extends RecyclerView.Adapter<CoinsInfoAdapter.View
             this.listener = listener;
         }
 
-        public void bind(CoinsInfo coinsInfo, List<String> selectedUtxos) {
-            boolean selected = selectedUtxos.contains(coinsInfo.getKeyImage());
+        public void bind(CoinsInfo coinsInfo, List<CoinsInfo> selectedUtxos) {
+            boolean selected = false;
+            for(CoinsInfo selectedUtxo : selectedUtxos) {
+                if (Objects.equals(selectedUtxo.getKeyImage(), coinsInfo.getKeyImage())) {
+                    selected = true;
+                    break;
+                }
+            }
             TextView pubKeyTextView = itemView.findViewById(R.id.utxo_pub_key_textview);
             TextView amountTextView = itemView.findViewById(R.id.utxo_amount_textview);
             TextView globalIdxTextView = itemView.findViewById(R.id.utxo_global_index_textview);
@@ -119,10 +126,12 @@ public class CoinsInfoAdapter extends RecyclerView.Adapter<CoinsInfoAdapter.View
                 return unlocked;
             });
 
-            if (!coinsInfo.isUnlocked()) {
-                itemView.setBackgroundColor(ContextCompat.getColor(itemView.getContext(), R.color.oled_locked_utxo));
-            } else if (selected) {
+            if (selected) {
                 itemView.setBackgroundColor(ContextCompat.getColor(itemView.getContext(), R.color.oled_colorSecondary));
+            } else if(coinsInfo.isFrozen()) {
+                itemView.setBackgroundColor(ContextCompat.getColor(itemView.getContext(), R.color.oled_frozen_utxo));
+            } else if (!coinsInfo.isUnlocked()) {
+                itemView.setBackgroundColor(ContextCompat.getColor(itemView.getContext(), R.color.oled_locked_utxo));
             } else {
                 itemView.setBackgroundColor(ContextCompat.getColor(itemView.getContext(), android.R.color.transparent));
             }
diff --git a/app/src/main/java/net/mynero/wallet/fragment/utxos/UtxosFragment.java b/app/src/main/java/net/mynero/wallet/fragment/utxos/UtxosFragment.java
index 32ec277..0acdb51 100644
--- a/app/src/main/java/net/mynero/wallet/fragment/utxos/UtxosFragment.java
+++ b/app/src/main/java/net/mynero/wallet/fragment/utxos/UtxosFragment.java
@@ -5,6 +5,7 @@ import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Button;
+import android.widget.Toast;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
@@ -19,18 +20,27 @@ import net.mynero.wallet.fragment.dialog.SendBottomSheetDialog;
 import net.mynero.wallet.model.CoinsInfo;
 import net.mynero.wallet.service.AddressService;
 import net.mynero.wallet.service.UTXOService;
+import net.mynero.wallet.util.MoneroThreadPoolExecutor;
 import net.mynero.wallet.util.UriData;
 
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.List;
 
 public class UtxosFragment extends Fragment implements CoinsInfoAdapter.CoinsInfoAdapterListener, SendBottomSheetDialog.Listener {
 
     private UtxosViewModel mViewModel;
-    private final ArrayList<String> selectedUtxos = new ArrayList<>();
+    private final ArrayList<CoinsInfo> selectedUtxos = new ArrayList<>();
     private final CoinsInfoAdapter adapter = new CoinsInfoAdapter(this);
     private Button sendUtxosButton;
     private Button churnUtxosButton;
+    private Button freezeUtxosButton;
+    enum FreezeActionType {
+        FREEZE,
+        UNFREEZE,
+        TOGGLE_FREEZE
+    }
+    private FreezeActionType freezeActionType = FreezeActionType.FREEZE;
 
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
@@ -47,22 +57,45 @@ public class UtxosFragment extends Fragment implements CoinsInfoAdapter.CoinsInf
     }
 
     private void bindListeners(View view) {
+        freezeUtxosButton = view.findViewById(R.id.freeze_utxos_button);
         sendUtxosButton = view.findViewById(R.id.send_utxos_button);
         churnUtxosButton = view.findViewById(R.id.churn_utxos_button);
         sendUtxosButton.setVisibility(View.GONE);
         churnUtxosButton.setVisibility(View.GONE);
+        freezeUtxosButton.setVisibility(View.GONE);
+        freezeUtxosButton.setOnClickListener(view1 -> {
+            Toast.makeText(getContext(), "Toggling freeze status, please wait.", Toast.LENGTH_SHORT).show();
+            MoneroThreadPoolExecutor.MONERO_THREAD_POOL_EXECUTOR.execute(() -> {
+                UTXOService.getInstance().toggleFrozen(selectedUtxos);
+                getActivity().runOnUiThread(() -> {
+                    selectedUtxos.clear();
+                    adapter.updateSelectedUtxos(new ArrayList<>());
+                    sendUtxosButton.setVisibility(View.GONE);
+                    churnUtxosButton.setVisibility(View.GONE);
+                    freezeUtxosButton.setVisibility(View.GONE);
+                });
+            });
+        });
         sendUtxosButton.setOnClickListener(view1 -> {
+            ArrayList<String> selectedKeyImages = new ArrayList<>();
+            for(CoinsInfo coinsInfo : selectedUtxos) {
+                selectedKeyImages.add(coinsInfo.getKeyImage());
+            }
             SendBottomSheetDialog sendDialog = new SendBottomSheetDialog();
             sendDialog.listener = this;
-            sendDialog.selectedUtxos = selectedUtxos;
+            sendDialog.selectedUtxos = selectedKeyImages;
             sendDialog.show(getActivity().getSupportFragmentManager(), null);
         });
         churnUtxosButton.setOnClickListener(view1 -> {
+            ArrayList<String> selectedKeyImages = new ArrayList<>();
+            for(CoinsInfo coinsInfo : selectedUtxos) {
+                selectedKeyImages.add(coinsInfo.getKeyImage());
+            }
             SendBottomSheetDialog sendDialog = new SendBottomSheetDialog();
             sendDialog.listener = this;
             sendDialog.isChurning = true;
             sendDialog.uriData = UriData.parse(AddressService.getInstance().currentSubaddress().getAddress());
-            sendDialog.selectedUtxos = selectedUtxos;
+            sendDialog.selectedUtxos = selectedKeyImages;
             sendDialog.show(getActivity().getSupportFragmentManager(), null);
         });
     }
@@ -93,22 +126,43 @@ public class UtxosFragment extends Fragment implements CoinsInfoAdapter.CoinsInf
 
     @Override
     public void onUtxoSelected(CoinsInfo coinsInfo) {
-        boolean selected = selectedUtxos.contains(coinsInfo.getKeyImage());
+        boolean selected = selectedUtxos.contains(coinsInfo);
         if (selected) {
-            selectedUtxos.remove(coinsInfo.getKeyImage());
+            selectedUtxos.remove(coinsInfo);
         } else {
-            selectedUtxos.add(coinsInfo.getKeyImage());
+            selectedUtxos.add(coinsInfo);
         }
 
+        boolean frozenExists = false, unfrozenExists = false, bothExist = false;
+        for(CoinsInfo selectedUtxo : selectedUtxos) {
+            if(selectedUtxo.isFrozen())
+                frozenExists = true;
+            else {
+                unfrozenExists = true;
+            }
+        }
+        bothExist = frozenExists && unfrozenExists;
+
         if (selectedUtxos.isEmpty()) {
             sendUtxosButton.setVisibility(View.GONE);
             churnUtxosButton.setVisibility(View.GONE);
+            freezeUtxosButton.setVisibility(View.GONE);
+            freezeActionType = FreezeActionType.FREEZE;
         } else {
             sendUtxosButton.setVisibility(View.VISIBLE);
             churnUtxosButton.setVisibility(View.VISIBLE);
+            freezeUtxosButton.setVisibility(View.VISIBLE);
         }
 
         adapter.updateSelectedUtxos(selectedUtxos);
+
+        if(bothExist) {
+            freezeUtxosButton.setText(R.string.toggle_freeze);
+        } else if(frozenExists) {
+            freezeUtxosButton.setText(R.string.unfreeze);
+        } else if(unfrozenExists) {
+            freezeUtxosButton.setText(R.string.freeze);
+        }
     }
 
     @Override
diff --git a/app/src/main/java/net/mynero/wallet/model/Coins.java b/app/src/main/java/net/mynero/wallet/model/Coins.java
index f6fb33f..a9854ca 100644
--- a/app/src/main/java/net/mynero/wallet/model/Coins.java
+++ b/app/src/main/java/net/mynero/wallet/model/Coins.java
@@ -46,5 +46,7 @@ public class Coins {
         coins = transactionInfos;
     }
 
+    public native void setFrozen(String publicKey, boolean frozen);
+
     private native List<CoinsInfo> refreshJ();
 }
diff --git a/app/src/main/java/net/mynero/wallet/model/CoinsInfo.java b/app/src/main/java/net/mynero/wallet/model/CoinsInfo.java
index c572120..962c418 100644
--- a/app/src/main/java/net/mynero/wallet/model/CoinsInfo.java
+++ b/app/src/main/java/net/mynero/wallet/model/CoinsInfo.java
@@ -46,8 +46,9 @@ public class CoinsInfo implements Parcelable, Comparable<CoinsInfo> {
     String pubKey;
     boolean unlocked;
     long localOutputIndex;
+    boolean frozen;
 
-    public CoinsInfo(long globalOutputIndex, boolean spent, String keyImage, long amount, String hash, String pubKey, boolean unlocked, long localOutputIndex) {
+    public CoinsInfo(long globalOutputIndex, boolean spent, String keyImage, long amount, String hash, String pubKey, boolean unlocked, long localOutputIndex, boolean frozen) {
         this.globalOutputIndex = globalOutputIndex;
         this.spent = spent;
         this.keyImage = keyImage;
@@ -56,6 +57,7 @@ public class CoinsInfo implements Parcelable, Comparable<CoinsInfo> {
         this.pubKey = pubKey;
         this.unlocked = unlocked;
         this.localOutputIndex = localOutputIndex;
+        this.frozen = frozen;
     }
 
     protected CoinsInfo(Parcel in) {
@@ -94,6 +96,10 @@ public class CoinsInfo implements Parcelable, Comparable<CoinsInfo> {
         return localOutputIndex;
     }
 
+    public boolean isFrozen() {
+        return frozen;
+    }
+
     @Override
     public int describeContents() {
         return 0;
diff --git a/app/src/main/java/net/mynero/wallet/service/UTXOService.java b/app/src/main/java/net/mynero/wallet/service/UTXOService.java
index 057a412..a19fe9f 100644
--- a/app/src/main/java/net/mynero/wallet/service/UTXOService.java
+++ b/app/src/main/java/net/mynero/wallet/service/UTXOService.java
@@ -5,6 +5,7 @@ import android.util.Pair;
 import androidx.lifecycle.LiveData;
 import androidx.lifecycle.MutableLiveData;
 
+import net.mynero.wallet.model.Coins;
 import net.mynero.wallet.model.CoinsInfo;
 import net.mynero.wallet.model.PendingTransaction;
 import net.mynero.wallet.model.Wallet;
@@ -36,6 +37,14 @@ public class UTXOService extends ServiceBase {
         return WalletManager.getInstance().getWallet().getCoins().getAll();
     }
 
+    public void toggleFrozen(List<CoinsInfo> selectedCoins) {
+        Coins coins = WalletManager.getInstance().getWallet().getCoins();
+        for(CoinsInfo coin : selectedCoins) {
+            coins.setFrozen(coin.getPubKey(), !coin.isFrozen());
+        }
+        refreshUtxos();
+    }
+
     public ArrayList<String> selectUtxos(long amount, boolean sendAll) throws Exception {
         final long basicFeeEstimate = calculateBasicFee(amount);
         final long amountWithBasicFee = amount + basicFeeEstimate;
@@ -46,7 +55,7 @@ public class UTXOService extends ServiceBase {
         Collections.sort(utxos);
         //loop through each utxo
         for (CoinsInfo coinsInfo : utxos) {
-            if (!coinsInfo.isSpent() && coinsInfo.isUnlocked()) { //filter out spent and locked outputs
+            if (!coinsInfo.isSpent() && coinsInfo.isUnlocked() && !coinsInfo.isFrozen()) { //filter out spent, locked, and frozen outputs
                 if (sendAll) {
                     // if send all, add all utxos and set amount to send all
                     selectedUtxos.add(coinsInfo.getKeyImage());
diff --git a/app/src/main/res/drawable/button_bg_center.xml b/app/src/main/res/drawable/button_bg_center.xml
new file mode 100644
index 0000000..10f01bd
--- /dev/null
+++ b/app/src/main/res/drawable/button_bg_center.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- Color when the row is selected -->
+    <item android:drawable="@drawable/button_bg_enabled_center" android:state_enabled="true" />
+    <!-- Standard background color -->
+    <item android:drawable="@drawable/button_bg_disabled_center" />
+</selector>
\ No newline at end of file
diff --git a/app/src/main/res/drawable/button_bg_disabled_center.xml b/app/src/main/res/drawable/button_bg_disabled_center.xml
new file mode 100644
index 0000000..83846bc
--- /dev/null
+++ b/app/src/main/res/drawable/button_bg_disabled_center.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <padding
+        android:left="8dp"
+        android:right="8dp" />
+    <solid android:color="@color/button_disabled_bg_color" />
+</shape>
diff --git a/app/src/main/res/drawable/button_bg_enabled_center.xml b/app/src/main/res/drawable/button_bg_enabled_center.xml
new file mode 100644
index 0000000..3a0b828
--- /dev/null
+++ b/app/src/main/res/drawable/button_bg_enabled_center.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <padding
+        android:left="8dp"
+        android:right="8dp" />
+    <solid android:color="@color/oled_colorSecondary" />
+</shape>
diff --git a/app/src/main/res/layout/fragment_utxos.xml b/app/src/main/res/layout/fragment_utxos.xml
index ea8cd54..24bf6a1 100644
--- a/app/src/main/res/layout/fragment_utxos.xml
+++ b/app/src/main/res/layout/fragment_utxos.xml
@@ -47,15 +47,25 @@
         app:layout_constraintStart_toStartOf="parent">
 
         <Button
-            android:id="@+id/churn_utxos_button"
+            android:id="@+id/freeze_utxos_button"
             android:layout_width="0dp"
             android:layout_height="wrap_content"
             android:background="@drawable/button_bg_left"
             android:layout_marginEnd="1dp"
+            android:text="@string/freeze"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toStartOf="@id/churn_utxos_button"
+            app:layout_constraintStart_toStartOf="parent" />
+
+        <Button
+            android:id="@+id/churn_utxos_button"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:background="@drawable/button_bg_center"
             android:text="@string/churn"
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintEnd_toStartOf="@id/send_utxos_button"
-            app:layout_constraintStart_toStartOf="parent" />
+            app:layout_constraintStart_toEndOf="@id/freeze_utxos_button" />
 
         <Button
             android:id="@+id/send_utxos_button"
diff --git a/app/src/main/res/values-night/colors.xml b/app/src/main/res/values-night/colors.xml
index ecb388b..cd394cb 100644
--- a/app/src/main/res/values-night/colors.xml
+++ b/app/src/main/res/values-night/colors.xml
@@ -33,6 +33,7 @@
     <color name="oled_txBackgroundColor">#060606</color>
     <color name="oled_dialogBackgroundColor">#0E0E0E</color>
     <color name="oled_addressListColor">#353535</color>
+    <color name="oled_frozen_utxo">#437895</color>
 
     <!-- CLASSIC -->
 
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index bbc567b..a772343 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -34,6 +34,7 @@
     <color name="oled_txBackgroundColor">#FBFBFB</color>
     <color name="oled_dialogBackgroundColor">#E8E8E8</color>
     <color name="oled_addressListColor">#bbbbbb</color>
+    <color name="oled_frozen_utxo">#437895</color>
 
     <!-- CLASSIC -->
 
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index fdf5133..b526700 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -101,6 +101,9 @@
     <string name="outpoint_text">Outpoint: %1$s</string>
     <string name="create_wallet_failed">Create wallet failed: %1$s</string>
     <string name="churn">Churn</string>
+    <string name="freeze">Freeze</string>
+    <string name="unfreeze">Unfreeze</string>
+    <string name="toggle_freeze">(Un)freeze</string>
     <string name="wallet_keys_label">Wallet Keys</string>
     <string name="done">Done</string>
     <string name="delete">Delete</string>