{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x29da9c648f58c7b401c666de0f185dbd0410c56ceb0e0d9de4fa5154a5593ae4",
    "signature": "0xe51c3d256292979bcc8e7a0fe9f3fa34f1b40b6180306fc44998fa696877777e37a3fca14a84405da5acbc245976febc5ddf4a394615647dc3f04aa3fee4c4941b",
    "signer": "0x515399926c2FCd6970811C1337c62fF3DDa03174",
    "userId": "754088057"
  }
}