{
  "manageEntity": {
    "action": "Save",
    "entityId": "1245557901",
    "entityType": "Track",
    "nonce": "0x89e8f4ad363133067f162f8eb41b8fc6224248a11449eb89f308244853251119",
    "signature": "0x6352787fd4310a3f8f6a3eeaedc996f0d275e89e245c9dbf7125d55c4b4ea9453f4f0c638a4214e2f6573f9e510f611bdc35dd0c3804d447fd7151b0877642b21b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}