{
  "manageEntity": {
    "action": "Save",
    "entityId": "142942",
    "entityType": "Track",
    "nonce": "0xe671f4e892deb716fea259d1238b3a2185da9c197355778f81c2da528ad2ead1",
    "signature": "0xfa39a18f536b73c808f7d21cf77497d23225df119dd444d0db660e084f24cb3a1d9e3067b97b026bce40132858a01c8be926615dc2adc09bd39895d8f5bb0df91c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}