Lcobucci\JWT\Token::verify PHP Method

    public function verify(Signer $signer, $key) : bool
    {
        if ($this->signature === null || $this->headers['alg'] !== $signer->getAlgorithmId()) {
            return false;
        }
        return $this->signature->verify($signer, $this->getPayload(), $key);
    }

 /**
  * @param Token $token
  * @return bool
  */
 public function validateToken(Token $token) : bool
 {
     return $token->validate($this->validationData) && $token->verify($this->signer, $this->secret);
 }