{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x575a5456e32673f13ba046afeaa76b219fa4adb56df3b45ed088248b16cf2052",
    "signature": "0xebdf4314a9c44c29ab7cfa95a15fca71d691b636409a6332711cbfd36f87bf221c3b2ca362c8def699e07259236c163b9ac947a160d46970138be62fca83ee811c",
    "signer": "0x74574267AC2AF4aED252e12d1abBCc1E3831B1e6",
    "userId": "364222999"
  }
}