{
  "manageEntity": {
    "action": "Save",
    "entityId": "978186139",
    "entityType": "Track",
    "nonce": "0xe563b214532045849f4536a6fea924845320195edff6f581084abef4f191048a",
    "signature": "0x59c08e441299d4596e64328fc4007c6c1082df073b873be715bf93165c7d525d3981d4da0c158dd7919cf52fa0073a1e4aa81f87c5620a9da9f17e581ed566411b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}