{
  "manageEntity": {
    "action": "Save",
    "entityId": "477774765",
    "entityType": "Track",
    "nonce": "0xb3f6878e49fb87f269479f360cec02f12e8ec2045e25a35a77a1574422fa002e",
    "signature": "0x21f94a81ff558e12376747510ce1353350e44cfabb57c93a478e376bea6fd4113422f7c76a78d96adc7df9b624ed0bcee9f321419b5982683e09ba90999ad2c61b",
    "signer": "0x5D012C880480A2E1ab4345f6F374CFf73e040331",
    "userId": "10449019"
  }
}