{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x35ad48cb93762b2bbb7b536a243b364fe58f716ea78e3a8d7156eb24b6a2e76c",
    "signature": "0x263b746f1c2a0c4c5cbd01ec5d9430c88f026cfee621dec16ed74a8c19574c547ca2f256d1940a2fadf14a2a4f80de29eeee7507b1a64c13a66a649b759ec4201c",
    "signer": "0x989faEfE658E0b6dF1793197b0De4137Cb1aDD3b",
    "userId": "554920508"
  }
}