{
  "manageEntity": {
    "action": "Save",
    "entityId": "423823",
    "entityType": "Track",
    "nonce": "0xa7ef4d204a89bf7c2702c5095670df4cd4c46369666d8eab0cb0167d9e9d13aa",
    "signature": "0xf02a03e3a660cfa1b18bafafa286f49caf7e65727ef7a3c2c2502114a9bc836c5bb4b4f79a1d75609385ab7cd530fb5567fd280d356ae011b7f8e9de99a39f3e1c",
    "signer": "0x793bbEFbb3Cf1e6529B90296e502145aCcCDE8d6",
    "userId": "838777725"
  }
}