{
  "manageEntity": {
    "action": "Save",
    "entityId": "1247739600",
    "entityType": "Track",
    "nonce": "0x625fee978960fb6c0aa82b0eea12cc39c153135c7e3ac09a21b28647ca634d24",
    "signature": "0x75e009b5d200d693420ed1f9053feba315e6f01fd0b8db0dfe5322dc4f155be70c8e024b7a6b27c9346f90f294bdddb170dfba504954788032f1df8e5e62359d1c",
    "signer": "0x1EEEf459C8e361773166d5681a5066659BC751D5",
    "userId": "210033902"
  }
}