code: def verify1(self):
          
          self._check_initialized()
          self._verify_private = curve25519.Private(secret=self.seed)
          self._verify_public = self._verify_private.get_public()
          log_binary(_LOGGER,
                     'Verification keys',
                     Private=self._verify_private.serialize(),
                     Public=self._verify_public.serialize())
          verify_public = self._verify_public.serialize()
          return b'\x01\x00\x00\x00' + verify_public + self._auth_public
docs: First device verification step.