{
  "manageEntity": {
    "action": "Save",
    "entityId": "1491394475",
    "entityType": "Track",
    "nonce": "0xb92773ec222b664f7d6c819ea5e540172cfdebd69ff231092bd233e9855fbe65",
    "signature": "0x2db171e9f23772e54b12a3b55df785728052372a52572949f8558c583dcff3d8464865a94b2cb2ec55116889c1666a9b4ec2d0cca20f526b081910ff73545ede1b",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}