diff --git a/backend/routes/auth.js b/backend/routes/auth.js
index ff827ac..af71c19 100644
--- a/backend/routes/auth.js
+++ b/backend/routes/auth.js
@@ -36,20 +36,27 @@ const OFFICIAL_CLIENT_MESSAGE = 'Используйте официальный 
 
 router.post('/signin', strictAuthLimiter, async (req, res) => {
   try {
-    const { initData } = req.body || {};
+    const authHeader = req.headers.authorization || '';
+    const headerInitData = authHeader.startsWith('tma ') ? authHeader.slice(4).trim() : null;
+    const bodyInitData = typeof req.body?.initData === 'string' ? req.body.initData : null;
 
-    if (!initData || typeof initData !== 'string') {
+    const initDataRaw = headerInitData || bodyInitData;
+
+    if (!initDataRaw) {
       return res.status(400).json({ error: 'initData обязателен' });
     }
 
-    let telegramUser;
+    let payload;
 
     try {
-      ({ telegramUser } = validateAndParseInitData(initData, req));
+      payload = validateAndParseInitData(initDataRaw);
     } catch (error) {
+      logSecurityEvent('INVALID_INITDATA', req, { reason: error.message });
       return res.status(401).json({ error: error.message });
     }
 
+    const telegramUser = payload.user;
+
     if (!validateTelegramId(telegramUser.id)) {
       logSecurityEvent('INVALID_TELEGRAM_ID', req, { telegramId: telegramUser.id });
       return res.status(400).json({ error: 'Неверный ID пользователя' });
diff --git a/backend/utils/telegram.js b/backend/utils/telegram.js
index c2dc7fd..79b559d 100644
--- a/backend/utils/telegram.js
+++ b/backend/utils/telegram.js
@@ -1,64 +1,48 @@
-const crypto = require('crypto');
+const { parse, isValid } = require('@telegram-apps/init-data-node');
 const config = require('../config');
 
 const MAX_AUTH_AGE_SECONDS = 5 * 60;
 
-function validateAndParseInitData(initData, req) {
+function validateAndParseInitData(initDataRaw) {
   if (!config.telegramBotToken) {
     throw new Error('TELEGRAM_BOT_TOKEN не настроен');
   }
 
-  const params = new URLSearchParams(initData);
-  const hash = params.get('hash');
-  const authDate = Number(params.get('auth_date'));
-
-  if (!hash) {
-    throw new Error('Отсутствует hash в initData');
+  if (!initDataRaw || typeof initDataRaw !== 'string') {
+    throw new Error('initData не передан');
   }
 
+  const trimmed = initDataRaw.trim();
+
+  if (!trimmed.length) {
+    throw new Error('initData пуст');
+  }
+
+  const valid = isValid(trimmed, config.telegramBotToken);
+
+  if (!valid) {
+    throw new Error('Неверная подпись initData');
+  }
+
+  const payload = parse(trimmed);
+
+  if (!payload || !payload.user) {
+    throw new Error('Отсутствует пользователь в initData');
+  }
+
+  const authDate = Number(payload.auth_date);
+
   if (!authDate) {
     throw new Error('Отсутствует auth_date в initData');
   }
 
-  const dataCheck = [];
-  for (const [key, value] of params.entries()) {
-    if (key === 'hash') continue;
-    dataCheck.push(`${key}=${value}`);
-  }
-
-  dataCheck.sort((a, b) => a.localeCompare(b));
-  const dataCheckString = dataCheck.join('\n');
-
-  const secretKey = crypto.createHmac('sha256', 'WebAppData').update(config.telegramBotToken).digest();
-  const calculatedHash = crypto.createHmac('sha256', secretKey).update(dataCheckString).digest('hex');
-
-  if (calculatedHash !== hash) {
-    throw new Error('Неверная подпись initData');
-  }
-
   const now = Math.floor(Date.now() / 1000);
+
   if (Math.abs(now - authDate) > MAX_AUTH_AGE_SECONDS) {
     throw new Error('Данные авторизации устарели');
   }
 
-  const userParam = params.get('user');
-
-  if (!userParam) {
-    throw new Error('Отсутствует пользователь в initData');
-  }
-
-  let telegramUser;
-  try {
-    telegramUser = JSON.parse(userParam);
-  } catch (error) {
-    throw new Error('Некорректный формат user в initData');
-  }
-
-  if (!telegramUser || !telegramUser.id) {
-    throw new Error('Отсутствует ID пользователя в initData');
-  }
-
-  return { params, telegramUser };
+  return payload;
 }
 
 module.exports = {
diff --git a/frontend/src/utils/api.js b/frontend/src/utils/api.js
index 120f621..54c14b9 100644
--- a/frontend/src/utils/api.js
+++ b/frontend/src/utils/api.js
@@ -16,6 +16,17 @@ const api = axios.create({
   }
 })
 
+api.interceptors.request.use((config) => {
+  const initData = window.Telegram?.WebApp?.initData;
+  if (initData) {
+    config.headers = config.headers || {};
+    if (!config.headers.Authorization) {
+      config.headers.Authorization = `tma ${initData}`;
+    }
+  }
+  return config;
+});
+
 // Auth API
 export const signInWithTelegram = async (initData) => {
   const response = await api.post('/auth/signin', { initData })
diff --git a/moderation/frontend/index.html b/moderation/frontend/index.html
index 1444e27..6f21784 100644
--- a/moderation/frontend/index.html
+++ b/moderation/frontend/index.html
@@ -5,6 +5,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
     <meta name="theme-color" content="#000000" />
     <title>Nakama Moderation</title>
+    <script src="https://telegram.org/js/telegram-web-app.js"></script>
   </head>
   <body>
     <div id="root"></div>
diff --git a/moderation/frontend/src/utils/api.js b/moderation/frontend/src/utils/api.js
index 785a3d7..4d47b13 100644
--- a/moderation/frontend/src/utils/api.js
+++ b/moderation/frontend/src/utils/api.js
@@ -9,6 +9,17 @@ const api = axios.create({
   withCredentials: true
 })
 
+api.interceptors.request.use((config) => {
+  const initData = window.Telegram?.WebApp?.initData;
+  if (initData) {
+    config.headers = config.headers || {};
+    if (!config.headers.Authorization) {
+      config.headers.Authorization = `tma ${initData}`;
+    }
+  }
+  return config;
+});
+
 export const signInWithTelegram = (initData) =>
   api.post('/auth/signin', { initData }).then((res) => res.data.user)
 
diff --git a/package.json b/package.json
index 3a9c86a..e914654 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,8 @@
     "xss-clean": "^0.1.4",
     "hpp": "^0.2.3",
     "validator": "^13.11.0",
-    "cookie-parser": "^1.4.6"
+    "cookie-parser": "^1.4.6",
+    "@telegram-apps/init-data-node": "^1.0.0"
   },
   "devDependencies": {
     "nodemon": "^3.0.1",