diff --git a/src/app/tools/session/page.tsx b/src/app/tools/session/page.tsx
index 740e728db..66c0d9c78 100644
--- a/src/app/tools/session/page.tsx
+++ b/src/app/tools/session/page.tsx
@@ -14,7 +14,7 @@ import { debounce } from 'lodash';
 import { useEffect, useRef, useState } from 'react';
 import PageWrapper from '../../../components/PageWrapper';
 import { UNLOCALIZED_REGION_NAMES_SHORT } from '../../../constants/regions';
-import { WARGAMING_APPLICATION_ID } from '../../../constants/wargamingApplicationID';
+import { authURL } from '../../../core/blitz/authURL';
 import { getAccountInfo } from '../../../core/blitz/getAccountInfo';
 import getTankStats from '../../../core/blitz/getTankStats';
 import { idToRegion } from '../../../core/blitz/idToRegion';
@@ -117,11 +117,10 @@ export default function Page() {
               </AlertDialog.Cancel>
               <AlertDialog.Action>
                 <Link
-                  href={`https://api.worldoftanks.${
-                    (session as SessionTracking).player.region
-                  }/wot/auth/login/?application_id=${WARGAMING_APPLICATION_ID}&redirect_uri=${encodeURIComponent(
-                    `${location.origin}/callback/wargaming/?return=${location.href}`,
-                  )}`}
+                  href={authURL(
+                    (session as SessionTracking).player.region,
+                    location.href,
+                  )}
                 >
                   <Button variant="solid">Sign in</Button>
                 </Link>
diff --git a/src/components/Navbar/components/LoggedIn.tsx b/src/components/Navbar/components/LoggedIn.tsx
new file mode 100644
index 000000000..b6deaf1e4
--- /dev/null
+++ b/src/components/Navbar/components/LoggedIn.tsx
@@ -0,0 +1,22 @@
+import { ExitIcon } from '@radix-ui/react-icons';
+import { Flex, IconButton, Text } from '@radix-ui/themes';
+import { use } from 'react';
+import { getAccountInfo } from '../../../core/blitz/getAccountInfo';
+import { idToRegion } from '../../../core/blitz/idToRegion';
+import { logout } from '../../../core/blitz/logout';
+import { useApp } from '../../../stores/app';
+
+export function LoggedIn() {
+  const login = useApp((state) => state.login!);
+  const accountInfo = use(getAccountInfo(idToRegion(login.id), login.id));
+
+  return (
+    <Flex gap="3" align="center">
+      <Text>Hello, {accountInfo.nickname}</Text>
+
+      <IconButton variant="ghost" color="red" onClick={logout}>
+        <ExitIcon />
+      </IconButton>
+    </Flex>
+  );
+}
diff --git a/src/components/Navbar/index.tsx b/src/components/Navbar/index.tsx
index 19ecd2dd0..ab5600efd 100644
--- a/src/components/Navbar/index.tsx
+++ b/src/components/Navbar/index.tsx
@@ -2,25 +2,50 @@ import {
   DiscordLogoIcon,
   GearIcon,
   HamburgerMenuIcon,
+  PersonIcon,
 } from '@radix-ui/react-icons';
 import {
+  Button,
   Flex,
   Heading,
   IconButton,
   Link as LinkRadix,
   Popover,
+  Select,
+  Spinner,
+  Text,
 } from '@radix-ui/themes';
 import Link from 'next/link';
+import { Suspense, useEffect, useState } from 'react';
+import { Region } from '../../constants/regions';
 import { TOOLS } from '../../constants/tools';
+import { authURL } from '../../core/blitz/authURL';
+import { extendAuth } from '../../core/blitz/extendAuth';
+import { logout } from '../../core/blitz/logout';
 import { useFullScreen } from '../../hooks/useFullScreen';
-import { useWideFormat } from '../../hooks/useWideFormat';
 import { BlitzkitWide } from '../../icons/BlitzkitWide';
 import { PatreonIcon } from '../../icons/Patreon';
 import { theme } from '../../stitches.config';
+import { useApp } from '../../stores/app';
+import { LoggedIn } from './components/LoggedIn';
 
 export default function Navbar() {
   const isFullScreen = useFullScreen();
-  const wideFormat = useWideFormat(600);
+  const login = useApp((state) => state.login);
+  const [region, setRegion] = useState<Region>('com');
+
+  useEffect(() => {
+    if (!login) return;
+
+    const expiresIn = login.expiresAt - Date.now() / 1000;
+    const expiresInDays = expiresIn / 60 / 60 / 24;
+
+    if (expiresInDays < 0) {
+      logout();
+    } else if (expiresInDays < 7) {
+      extendAuth();
+    }
+  });
 
   if (isFullScreen) return null;
 
@@ -89,6 +114,7 @@ export default function Navbar() {
           >
             <PatreonIcon width={14} height={14} />
           </Link>
+          <div style={{ width: 14, height: 14 }} />
 
           <div style={{ flex: 1 }} />
 
@@ -153,6 +179,54 @@ export default function Navbar() {
               </Flex>
             </Popover.Content>
           </Popover.Root>
+
+          <Popover.Root>
+            <Popover.Trigger>
+              <IconButton variant="ghost" color="gray">
+                <PersonIcon />
+              </IconButton>
+            </Popover.Trigger>
+
+            <Popover.Content align="center">
+              <Flex direction="column" gap="2">
+                {login && (
+                  <Suspense fallback={<Spinner />}>
+                    <LoggedIn />
+                  </Suspense>
+                )}
+
+                {!login && (
+                  <>
+                    <Text color="gray">Currently signed out</Text>
+
+                    <Flex gap="2">
+                      <Select.Root
+                        value={region}
+                        onValueChange={(value) => setRegion(value as Region)}
+                      >
+                        <Select.Trigger />
+                        <Select.Content>
+                          <Select.Item value={'com' satisfies Region}>
+                            North America
+                          </Select.Item>
+                          <Select.Item value={'eu' satisfies Region}>
+                            Europe
+                          </Select.Item>
+                          <Select.Item value={'asia' satisfies Region}>
+                            Asia
+                          </Select.Item>
+                        </Select.Content>
+                      </Select.Root>
+
+                      <LinkRadix href={authURL(region)}>
+                        <Button>Sign in</Button>
+                      </LinkRadix>
+                    </Flex>
+                  </>
+                )}
+              </Flex>
+            </Popover.Content>
+          </Popover.Root>
         </Flex>
       </Flex>
     </div>
diff --git a/src/core/blitz/authURL.ts b/src/core/blitz/authURL.ts
new file mode 100644
index 000000000..19d3a14b6
--- /dev/null
+++ b/src/core/blitz/authURL.ts
@@ -0,0 +1,8 @@
+import { Region } from '../../constants/regions';
+import { WARGAMING_APPLICATION_ID } from '../../constants/wargamingApplicationID';
+
+export function authURL(region: Region, callback?: string) {
+  return `https://api.worldoftanks.${region}/wot/auth/login/?application_id=${WARGAMING_APPLICATION_ID}&redirect_uri=${encodeURIComponent(
+    `${location.origin}/callback/wargaming/${callback ? `?return=${location.href}` : ''}`,
+  )}`;
+}
diff --git a/src/core/blitz/extendAuth.ts b/src/core/blitz/extendAuth.ts
new file mode 100644
index 000000000..578e7da38
--- /dev/null
+++ b/src/core/blitz/extendAuth.ts
@@ -0,0 +1,59 @@
+import { WARGAMING_APPLICATION_ID } from '../../constants/wargamingApplicationID';
+import { mutateApp, useApp } from '../../stores/app';
+import { idToRegion } from './idToRegion';
+
+interface Extension {
+  data: {
+    access_token: string;
+    account_id: number;
+    expires_at: number;
+  };
+}
+
+export async function extendAuth() {
+  const { login } = useApp.getState();
+
+  if (!login) return;
+
+  // error handling? what's that?
+  /*
+  ⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡿⠟⠛⠛⠛⠋⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠙⠛⠛⠛⠿⠻⠿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿
+  ⣿⣿⣿⣿⣿⣿⣿⣿⣿⡿⠋⠀⠀⠀⠀⠀⡀⠠⠤⠒⢂⣉⣉⣉⣑⣒⣒⠒⠒⠒⠒⠒⠒⠒⠀⠀⠐⠒⠚⠻⠿⠿⣿⣿⣿⣿⣿⣿⣿⣿⣿
+  ⣿⣿⣿⣿⣿⣿⣿⣿⠏⠀⠀⠀⠀⡠⠔⠉⣀⠔⠒⠉⣀⣀⠀⠀⠀⣀⡀⠈⠉⠑⠒⠒⠒⠒⠒⠈⠉⠉⠉⠁⠂⠀⠈⠙⢿⣿⣿⣿⣿⣿⣿
+  ⣿⣿⣿⣿⣿⣿⣿⠇⠀⠀⠀⠔⠁⠠⠖⠡⠔⠊⠀⠀⠀⠀⠀⠀⠀⠐⡄⠀⠀⠀⠀⠀⠀⡄⠀⠀⠀⠀⠉⠲⢄⠀⠀⠀⠈⣿⣿⣿⣿⣿⣿⣿⣿
+  ⣿⣿⣿⣿⣿⣿⠋⠀⠀⠀⠀⠀⠀⠀⠊⠀⢀⣀⣤⣤⣤⣤⣀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠜⠀⠀⠀⠀⣀⡀⠀⠈⠃⠀⠀⠀⠸⣿⣿⣿⣿⣿⣿⣿
+  ⣿⣿⣿⣿⡿⠥⠐⠂⠀⠀⠀⠀⡄⠀⠰⢺⣿⣿⣿⣿⣿⣟⠀⠈⠐⢤⠀⠀⠀⠀⠀⠀⢀⣠⣶⣾⣯⠀⠀⠉⠂⠀⠠⠤⢄⣀⠙⢿⣿⣿⣿⣿
+  ⣿⡿⠋⠡⠐⠈⣉⠭⠤⠤⢄⡀⠈⠀⠈⠁⠉⠁⡠⠀⠀⠀⠉⠐⠠⠔⠀⠀⠀⠀⠀⠲⣿⠿⠛⠛⠓⠒⠂⠀⠀⠀⠀⠀⠀⠠⡉⢢⠙⣿⣿⣿
+  ⣿⠀⢀⠁⠀⠊⠀⠀⠀⠀⠀⠈⠁⠒⠂⠀⠒⠊⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡇⠀⠀⠀⠀⠀⢀⣀⡠⠔⠒⠒⠂⠀⠈⠀⡇⣿⣿⣿⣿⣿
+  ⣿⠀⢸⠀⠀⠀⢀⣀⡠⠋⠓⠤⣀⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠄⠀⠀⠀⠀⠀⠀⠈⠢⠤⡀⠀⠀⠀⠀⠀⠀⢠⠀⠀⠀⡠⠀⡇⣿⣿⣿⣿⣿
+  ⣿⡀⠘⠀⠀⠀⠀⠀⠘⡄⠀⠀⠀⠈⠑⡦⢄⣀⠀⠀⠐⠒⠁⢸⠀⠀⠠⠒⠄⠀⠀⠀⠀⠀⢀⠇⠀⣀⡀⠀⠀⢀⢾⡆⠀⠈⡀⠎⣸⣿⣿⣿
+  ⣿⣿⣄⡈⠢⠀⠀⠀⠀⠘⣶⣄⡀⠀⠀⡇⠀⠀⠈⠉⠒⠢⡤⣀⡀⠀⠀⠀⠀⠀⠐⠦⠤⠒⠁⠀⠀⠀⠀⣀⢴⠁⠀⢷⠀⠀⠀⢰⣿⣿⣿⣿
+  ⣿⣿⣿⣿⣇⠂⠀⠀⠀⠀⠈⢂⠀⠈⠹⡧⣀⠀⠀⠀⠀⠀⡇⠀⠀⠉⠉⠉⢱⠒⠒⠒⠒⢖⠒⠒⠂⠙⠏⠀⠘⡀⠀⢸⠀⠀⠀⣿⣿⣿⣿
+  ⣿⣿⣿⣿⣿⣧⠀⠀⠀⠀⠀⠀⠑⠄⠰⠀⠀⠁⠐⠲⣤⣴⣄⡀⠀⠀⠀⠀⢸⠀⠀⠀⠀⢸⠀⠀⠀⠀⢠⠀⣠⣷⣶⣿⠀⠀⢰⣿⣿⣿⣿⣿
+  ⣿⣿⣿⣿⣿⣿⣧⠀⠀⠀⠀⠀⠀⠀⠁⢀⠀⠀⠀⠀⠀⡙⠋⠙⠓⠲⢤⣤⣷⣤⣤⣤⣤⣾⣦⣤⣤⣶⣿⣿⣿⣿⡟⢹⠀⠀⢸⣿⣿⣿
+  ⣿⣿⣿⣿⣿⣿⣿⣧⡀⠀⠀⠀⠀⠀⠀⠀⠑⠀⢄⠀⡰⠁⠀⠀⠀⠀⠀⠈⠉⠁⠈⠉⠻⠋⠉⠛⢛⠉⠉⢹⠁⢀⢇⠎⠀⠀⢸⣿⣿⣿
+  ⣿⣿⣿⣿⣿⣿⣿⣿⣿⣦⣀⠈⠢⢄⡉⠂⠄⡀⠀⠈⠒⠢⠄⠀⢀⣀⣀⣰⠀⠀⠀⠀⠀⠀⠀⠀⡀⠀⢀⣎⠀⠼⠊⠀⠀⠀⠘⣿⣿⣿
+  ⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⣄⡀⠉⠢⢄⡈⠑⠢⢄⡀⠀⠀⠀⠀⠀⠀⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠁⠀⠀⢀⠀⠀⠀⠀⠀⢻⣿⣿
+  ⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⣦⣀⡈⠑⠢⢄⡀⠈⠑⠒⠤⠄⣀⣀⠀⠉⠉⠉⠉⠀⠀⠀⣀⡀⠤⠂⠁⠀⢀⠆⠀⠀⢸⣿⣿
+  ⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⣦⣄⡀⠁⠉⠒⠂⠤⠤⣀⣀⣉⡉⠉⠉⠉⠉⢀⣀⣀⡠⠤⠒⠈⠀⠀⠀⠀⣸⣿⣿
+  ⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⣶⣤⣄⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣰⣿⣿⣿⣿⣿
+  ⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣶⣶⣶⣶⣤⣤⣤⣤⣀⣀⣤⣤⣤⣶⣾⣿⣿⣿⣿⣿
+  */
+
+  const response = await fetch(
+    `https://api.worldoftanks.${idToRegion(
+      login.id,
+    )}/wot/auth/prolongate/?application_id=${WARGAMING_APPLICATION_ID}&access_token=${
+      login.token
+    }`,
+  );
+  const json = (await response.json()) as Extension;
+
+  mutateApp((draft) => {
+    draft.login = {
+      id: login.id,
+      token: json.data.access_token,
+      expiresAt: json.data.expires_at,
+    };
+  });
+}
diff --git a/src/core/blitz/logout.ts b/src/core/blitz/logout.ts
new file mode 100644
index 000000000..290aa4774
--- /dev/null
+++ b/src/core/blitz/logout.ts
@@ -0,0 +1,7 @@
+import { mutateApp } from '../../stores/app';
+
+export function logout() {
+  mutateApp((draft) => {
+    draft.login = undefined;
+  });
+}
diff --git a/src/core/streams/wotbreplay.ts b/src/core/streams/wotbreplay.ts
index ab37f46ff..0d996ad86 100644
--- a/src/core/streams/wotbreplay.ts
+++ b/src/core/streams/wotbreplay.ts
@@ -1,5 +1,5 @@
 import AdmZip from 'adm-zip';
-import { readFile } from 'fs/promises';
+import { readFile, writeFile } from 'fs/promises';
 import { Parser } from 'pickleparser';
 import protobuf from 'protobufjs';
 import { ReadStream } from './buffer';
@@ -42,10 +42,14 @@ export class WotbReplayReadStream extends ReadStream {
       'BattleResultsGenerated.BattleResultsClient',
     );
 
-    const decodedBattleResults = BattleResults.decode(
-      Buffer.from(battleResultsString, 'binary'),
-    );
-    console.log(decodedBattleResults.toJSON());
+    writeFile('test.dat', Buffer.from(battleResultsString));
+
+    const reader = protobuf.Reader.create(Buffer.from(battleResultsString));
+
+    // const decodedBattleResults = BattleResults.decodeDelimited(
+    //   Buffer.from(battleResultsString),
+    // );
+    // console.log(decodedBattleResults.toJSON());
   }
 }