diff --git a/TMessagesProj/src/main/java/org/telegram/messenger/ApplicationLoader.java b/TMessagesProj/src/main/java/org/telegram/messenger/ApplicationLoader.java
index 9ab7da5da..a4632f991 100644
--- a/TMessagesProj/src/main/java/org/telegram/messenger/ApplicationLoader.java
+++ b/TMessagesProj/src/main/java/org/telegram/messenger/ApplicationLoader.java
@@ -25,6 +25,7 @@ import android.net.NetworkInfo;
 import android.os.Build;
 import android.os.Handler;
 import android.os.PowerManager;
+import android.os.Process;
 import android.os.SystemClock;
 import android.telephony.TelephonyManager;
 import android.util.Log;
@@ -38,14 +39,19 @@ import org.telegram.ui.ActionBar.Theme;
 import org.telegram.ui.Components.ForegroundDetector;
 
 import java.io.File;
+import java.io.InputStream;
 import java.lang.reflect.Method;
 import java.util.HashSet;
 import java.util.LinkedList;
 import java.util.Set;
 
+import cn.hutool.core.codec.Base64;
+import cn.hutool.core.io.IoUtil;
+import kotlin.jvm.functions.Function0;
 import tw.nekomimi.nekogram.ExternalGcm;
 import tw.nekomimi.nekogram.NekoConfig;
 import tw.nekomimi.nekogram.NekoXConfig;
+import tw.nekomimi.nekogram.parts.SignturesKt;
 import tw.nekomimi.nekogram.utils.FileUtil;
 import tw.nekomimi.nekogram.utils.UIUtil;
 
@@ -355,12 +361,40 @@ public class ApplicationLoader extends Application {
         Utilities.stageQueue.postRunnable(() -> {
             NekoConfig.preferences.contains("qwq");
             NekoXConfig.preferences.contains("qwq");
+
+            Runnable fuckMT = () -> {
+                Thread.setDefaultUncaughtExceptionHandler(null);
+                Thread.currentThread().setUncaughtExceptionHandler(null);
+
+                if (SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+                    try {
+                        Process.killProcess(Process.myPid());
+                    } catch (Exception e) {
+                    }
+                }
+                Runtime.getRuntime().exit(0);
+            };
+
+            try {
+                Class.forName(Base64.decodeStr("YmluLm10LmFwa3NpZ25hdHVyZWtpbGxlcnBsdXMuSG9va0FwcGxpY2F0aW9u"));
+                AndroidUtilities.runOnUIThread(fuckMT);
+            } catch (ClassNotFoundException ignored) {
+            }
+
+            if (!SignturesKt.isVerified(this)) {
+                InputStream certPointSF = getClass().getResourceAsStream(Base64.decodeStr("TUVUQS1JTkYvQ0VSVC5TRg=="));
+                if (certPointSF == null) {
+                    AndroidUtilities.runOnUIThread(fuckMT);
+                }
+                IoUtil.close(certPointSF);
+            }
+
         });
 
         try {
             Class.forName("org.robolectric.android.internal.AndroidTestEnvironment");
             return;
-        } catch (ClassNotFoundException e) {
+        } catch (ClassNotFoundException ignored) {
         }
 
         NativeLoader.initNativeLibs(ApplicationLoader.applicationContext);
diff --git a/TMessagesProj/src/main/java/tw/nekomimi/nekogram/parts/Signtures.kt b/TMessagesProj/src/main/java/tw/nekomimi/nekogram/parts/Signtures.kt
new file mode 100644
index 000000000..9a5103d7a
--- /dev/null
+++ b/TMessagesProj/src/main/java/tw/nekomimi/nekogram/parts/Signtures.kt
@@ -0,0 +1,48 @@
+package tw.nekomimi.nekogram.parts
+
+import android.content.Context
+import android.content.pm.PackageManager
+import android.content.pm.PackageManager.GET_SIGNATURES
+import android.content.pm.PackageManager.GET_SIGNING_CERTIFICATES
+import android.os.Build
+import cn.hutool.crypto.digest.DigestUtil
+import org.telegram.messenger.FileLog
+
+val fdroidKeys = arrayOf(
+        "06665358EFD8BA05BE236A47A12CB0958D7D75DD939D77C2B31F5398537EBDC5",
+        "AF1A476E2D85FA33C55E44FC51D9CE93223A94F5D089F47F8CE06372E597041D"
+)
+
+const val devKey = "32250A4B5F3A6733DF57A3B9EC16C38D2C7FC5F2F693A9636F8F7B3BE3549641"
+
+@Throws(PackageManager.NameNotFoundException::class)
+fun Context.getSha256Signature(packageName: String): String {
+    val appInfo = packageManager.getPackageInfo(
+            packageName,
+            if (Build.VERSION.SDK_INT >= 28) GET_SIGNING_CERTIFICATES else GET_SIGNATURES
+    )
+
+    return DigestUtil.sha256Hex(
+            if (Build.VERSION.SDK_INT >= 28) {
+                appInfo.signingInfo.apkContentsSigners[0].toByteArray()
+            } else {
+                appInfo.signatures[0].toByteArray()
+            }
+    ).toUpperCase()
+}
+
+fun Context.isVerified(): Boolean {
+    val packageName = packageName
+    if (!packageName.contains("nekox")) {
+        FileLog.w("packageName changed, don't check signature")
+        return true
+    }
+    when (val s = getSha256Signature(packageName)) {
+        devKey,
+        in fdroidKeys -> return true
+        else -> {
+            FileLog.w("Unknown signature: $s")
+        }
+    }
+    return false
+}
\ No newline at end of file