diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 4fa3faa..c62af39 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -47,6 +47,7 @@ jobs:
             dist/omnisd.zip
             dist/application.zip
             dist/manifest.webapp
+            dist/security.json
       - name: discord webhook
         env:
           DISCORD_WEBHOOK_URL: ${{ secrets.DISCORD_WEBHOOK_URL }}
diff --git a/scripts/esbuild.mjs b/scripts/esbuild.mjs
index f0a7c65..8333c8e 100755
--- a/scripts/esbuild.mjs
+++ b/scripts/esbuild.mjs
@@ -85,13 +85,30 @@ const options = {
   external: ["*.png", "*.ttf", "*.svg"],
 };
 
+import crypto from "crypto";
+
+async function getFile(path) {
+	const file = await fs.readFile(path);
+	return digest(file.buffer);
+}
+
+async function digest(buffer) {
+	const hashBuffer = await crypto.webcrypto.subtle.digest("SHA-256", buffer); // hash the message
+	const hashArray = Array.from(new Uint8Array(hashBuffer)); // convert buffer to byte array
+	const hashHex = hashArray.map((b) => b.toString(16).padStart(2, "0")).join(""); // convert bytes to hex string
+	return hashHex;
+}
+
 try {
-  await esbuild.build(options);
-  const regexp = /for((\s?)*)\(((\s?)*)const/g;
-  const text = await fs.readFile(outfile, "utf8");
-  // on KaiOS aka Firefox48, for(const is broken
-  await fs.writeFile(outfile, text.replace(regexp, "for(let "));
+	await esbuild.build(options);
+	const regexp = /for((\s?)*)\(((\s?)*)const/g;
+	const text = await fs.readFile(outfile, "utf8");
+	// on KaiOS aka Firefox48, for(const is broken
+	await fs.writeFile(outfile, text.replace(regexp, "for(let "));
+
+	const [main_page, bundle] = await Promise.all([getFile("./dist/index.html"), getFile("./dist/build/bundle.js")]);
+	await fs.writeFile("./dist/security.json", JSON.stringify({ main_page, bundle }));
 } catch (err) {
-  console.error(err);
-  process.exit(1);
+	console.error(err);
+	process.exit(1);
 }
diff --git a/src/assets/manifest.json b/src/assets/manifest.json
index 22391d8..2f40458 100644
--- a/src/assets/manifest.json
+++ b/src/assets/manifest.json
@@ -1,34 +1,34 @@
 {
-  "version": "2.0.12",
-  "name": "Sveltecord",
-  "description": "Discord Client for KaiOS written in svelte.",
-  "launch_path": "/index.html",
-  "icons": {
-    "56": "/css/56px.png",
-    "112": "/css/112px.png"
-  },
-  "developer": {
-    "name": "Cyan",
-    "url": "https://github.com/cyan-2048/Discord4KaiOS"
-  },
-  "origin": "app://sveltecord.cyankindasus.com",
-  "type": "privileged",
-  "permissions": {
-    "systemXHR": {
-      "description": "Required to access Discord's Server"
-    },
-    "video-capture": {
-      "description": "Reading Codes using the Camera"
-    },
-    "desktop-notification": {}
-  },
-  "installs_allowed_from": ["*"],
-  "locales": {
-    "en-US": {
-      "name": "Sveltecord",
-      "subtitle": "Discord Client for KaiOS",
-      "description": "Sveltecord is not affiliated, associated, authorized, endorsed by, or in any way officially connected with Discord™, or any of its subsidiaries or its affiliates."
-    }
-  },
-  "default_locale": "en"
+	"version": "2.0.13",
+	"name": "Sveltecord",
+	"description": "Discord Client for KaiOS written in svelte.",
+	"launch_path": "/index.html",
+	"icons": {
+		"56": "/css/56px.png",
+		"112": "/css/112px.png"
+	},
+	"developer": {
+		"name": "Cyan",
+		"url": "https://github.com/cyan-2048/Discord4KaiOS"
+	},
+	"origin": "app://sveltecord.cyankindasus.com",
+	"type": "privileged",
+	"permissions": {
+		"systemXHR": {
+			"description": "Required to access Discord's Server"
+		},
+		"video-capture": {
+			"description": "Reading Codes using the Camera"
+		},
+		"desktop-notification": {}
+	},
+	"installs_allowed_from": ["*"],
+	"locales": {
+		"en-US": {
+			"name": "Sveltecord",
+			"subtitle": "Discord Client for KaiOS",
+			"description": "Sveltecord is not affiliated, associated, authorized, endorsed by, or in any way officially connected with Discord™, or any of its subsidiaries or its affiliates."
+		}
+	},
+	"default_locale": "en"
 }
diff --git a/src/lib/security.js b/src/lib/security.js
new file mode 100644
index 0000000..115c32c
--- /dev/null
+++ b/src/lib/security.js
@@ -0,0 +1,20 @@
+import { xhr } from "./helper";
+
+async function getFile(url) {
+	const resp = await fetch(url);
+	return digest(await resp.arrayBuffer());
+}
+
+async function digest(buffer) {
+	const hashBuffer = await crypto.subtle.digest("SHA-256", buffer); // hash the message
+	const hashArray = Array.from(new Uint8Array(hashBuffer)); // convert buffer to byte array
+	const hashHex = hashArray.map((b) => b.toString(16).padStart(2, "0")).join(""); // convert bytes to hex string
+	return hashHex;
+}
+
+export async function checkSecurity({ main_page, bundle }) {
+	if (_main_page == main_page && _bundle == bundle) {
+		return true;
+	}
+	throw new Error("Security check failed");
+}
diff --git a/src/main.js b/src/main.js
index 5abd9c7..09db386 100644
--- a/src/main.js
+++ b/src/main.js
@@ -5,8 +5,10 @@ import manifest from "./assets/manifest.json";
 import App from "./App.svelte";
 import scrollBy from "./lib/scrollBy";
 import { navigate } from "svelte-routing";
-import { self } from "./lib/shared";
+import { self, settings } from "./lib/shared";
 import * as helper from "./lib/helper";
+import { checkSecurity } from "./lib/security";
+import { localStorage } from "./lib/database";
 
 //polyfill
 scrollBy();
@@ -14,15 +16,27 @@ navigate("/", { replace: true });
 
 document.documentElement.lang = navigator.language;
 
-new App({
-	target: document.body,
-});
+async function init() {
+	if (PRODUCTION && typeof SECURITY_CHECK == "object") {
+		await settings.init;
+		try {
+			await checkSecurity(SECURITY_CHECK);
+		} catch (e) {
+			console.error(e);
 
-if (PRODUCTION) {
-	self.then((self) => {
-		if (self !== null)
+			alert("security check failed! for your safety, the token is not revoked.");
+		}
+	}
+
+	new App({
+		target: document.body,
+	});
+
+	if (PRODUCTION) {
+		const _self = await self;
+		if (_self !== null)
 			for (const key in manifest) {
-				if (typeof manifest[key] === "string" && self.manifest[key] !== manifest[key]) {
+				if (typeof manifest[key] === "string" && _self.manifest[key] !== manifest[key]) {
 					alert("cannot guarantee the authenticity of this app!");
 					alert("Beware of using this app! Your token may be compromised.");
 					alert("only install the app from here: https://notabug.org/cyan-2048/Discord4KaiOS_rewrite");
@@ -31,44 +45,46 @@ if (PRODUCTION) {
 					return;
 				}
 			}
-	});
 
-	function _async(generator, __arguments = null, __this) {
-		return new Promise((resolve, reject) => {
-			var fulfilled = (value) => {
-				try {
-					step(generator.next(value));
-				} catch (e) {
-					reject(e);
-				}
-			};
-			var rejected = (value) => {
-				try {
-					step(generator.throw(value));
-				} catch (e) {
-					reject(e);
-				}
-			};
-			var step = (x) => (x.done ? resolve(x.value) : Promise.resolve(x.value).then(fulfilled, rejected));
-			step((generator = generator.apply(__this, __arguments)).next());
-		});
-	}
+		function _async(generator, __arguments = null, __this) {
+			return new Promise((resolve, reject) => {
+				var fulfilled = (value) => {
+					try {
+						step(generator.next(value));
+					} catch (e) {
+						reject(e);
+					}
+				};
+				var rejected = (value) => {
+					try {
+						step(generator.throw(value));
+					} catch (e) {
+						reject(e);
+					}
+				};
+				var step = (x) => (x.done ? resolve(x.value) : Promise.resolve(x.value).then(fulfilled, rejected));
+				step((generator = generator.apply(__this, __arguments)).next());
+			});
+		}
 
-	window.async = function (generator, _arguments) {
-		_async(generator, _arguments, this);
-	};
-} else {
-	function softkey(e) {
-		const { target, key, bubbles, cancelable, repeat, type } = e;
-		if (!/Left|Right/.test(key) || !key.startsWith("Arrow") || !e.ctrlKey) return;
-		e.stopImmediatePropagation();
-		e.stopPropagation();
-		e.preventDefault();
-		target.dispatchEvent(new KeyboardEvent(type, { key: "Soft" + key.slice(5), bubbles, cancelable, repeat }));
-	}
+		window.async = function (generator, _arguments) {
+			_async(generator, _arguments, this);
+		};
+	} else {
+		function softkey(e) {
+			const { target, key, bubbles, cancelable, repeat, type } = e;
+			if (!/Left|Right/.test(key) || !key.startsWith("Arrow") || !e.ctrlKey) return;
+			e.stopImmediatePropagation();
+			e.stopPropagation();
+			e.preventDefault();
+			target.dispatchEvent(new KeyboardEvent(type, { key: "Soft" + key.slice(5), bubbles, cancelable, repeat }));
+		}
 
-	document.addEventListener("keyup", softkey, true);
-	document.addEventListener("keydown", softkey, true);
+		document.addEventListener("keyup", softkey, true);
+		document.addEventListener("keydown", softkey, true);
 
-	Object.assign(window, helper);
+		Object.assign(window, helper);
+	}
 }
+
+init();