{
  "manageEntity": {
    "action": "Save",
    "entityId": "1373899437",
    "entityType": "Track",
    "nonce": "0x21dec520d04f8c5220e4fbc153ea0a17b13cbb8b5f32288503aea0ea617d45ed",
    "signature": "0xa0df0192fd3f839dc885af6208f72c68c9a1294f99a37152f17c9c5494d5395b7440a355da60ff2b89b09a5212956ba3f9b7d29660d2275696cfebdd1401d2d21b",
    "signer": "0x48a006fC89FEf065AAB7A5769519625870833CC6",
    "userId": "128172"
  }
}