{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x4422f443e727851e7ce8f9b18acf0da0bf428a6b981f94800401e5fda1ef0a64",
    "signature": "0x925507e07120b0b9f189010b3805c3c567d67d819e97fef9af4b9b150fe3cc2a2743e687ddefc2f55780be0fa5d6719414d5ec38da9804beceeb5e765369a6911b",
    "signer": "0x21529354907e07BD5376201F2ad6e4089Cdda9F5",
    "userId": "16526399"
  }
}