title: is Jwt token was UNIQUE
body: <p>I'm using JWT web token system. I was able to generate TOKENS successfully.
  I'm creating JWT tokens in Laravel as follows</p>
  
  <blockquote>
    <p>I'M USING FOLLOWING TECHNOLOGY STACK</p>
  </blockquote>
  
  <ul>
  <li><a href="http://laravel.com/" rel="nofollow">LARAVEL 5.2</a> framework</li>
  <li>JWT <a href="https://github.com/tymondesigns/jwt-auth" rel="nofollow">(package)</a></li>
  </ul>
  
  <blockquote>
    <p>SAMPLE CODE</p>
  </blockquote>
  
  <pre><code>use JWTAuth;
  use Tymon\JWTAuth\Exceptions\JWTException;
  
  class AuthenticateController extends Controller
  {
      public function authenticate(Request $request)
      {
          // grab credentials from the request
          $credentials = $request-&gt;only('email', 'password');
  
          try {
              // attempt to verify the credentials and create a token for the user
              if (! $token = JWTAuth::attempt($credentials)) {
                  return response()-&gt;json(['error' =&gt; 'invalid_credentials'], 401);
              }
          } catch (JWTException $e) {
              // something went wrong whilst attempting to encode the token
              return response()-&gt;json(['error' =&gt; 'could_not_create_token'], 500);
          }
  
          // all good so return the token
          return response()-&gt;json(compact('token'));
      }
  }
  </code></pre>
  
  <blockquote>
    <p>SAMPLE OUTPUT</p>
  </blockquote>
  
  <p>I'm GETTING</p>
  
  <pre><code>eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWV9.TJVA95OrM7E2cBab30RMHrHDcEfxjoYZgeFONFh7HgQ
  </code></pre>
  
  <blockquote>
    <p>QUESTION 1</p>
  </blockquote>
  
  <p><strong>Is the generated token is UNIQUE?</strong></p>