{
  "manageEntity": {
    "action": "Save",
    "entityId": "909208553",
    "entityType": "Track",
    "nonce": "0xb59d8586f96d4c354aca76ca359eca8af058872b899ee9a60ebed279ee4dfad0",
    "signature": "0x450971a05a23da54145a6dacc3d6e0cf47f491cdbc417df9cf44489edf0023e26afdff07f72c3d8cdbebd40b7e3986001e8f8d100d773857e4513c16b84053551b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}