{
  "manageEntity": {
    "action": "Save",
    "entityId": "1499039783",
    "entityType": "Track",
    "nonce": "0x6e22d4415bea6d4468a101ef1aecb248528baaf4312554a2a0f0de4e3329c408",
    "signature": "0x726b7473259efeaa2844a6c4420cf8cae4e01f13533c299c2e0c0be065f83751674960cd74d755f0e1183c131460624214569f92f9927c6c3e56569dc026ed9d1c",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}