{
  "manageEntity": {
    "action": "Save",
    "entityId": "514632",
    "entityType": "Track",
    "nonce": "0xca9cbf267be3c35f5df7000167e4fe8bbdd98ae36eea888873bb8620253b01ac",
    "signature": "0x7bd399f3ad352c245b6c980f6a7bbc899cde0e466f5b07abf81c63f9dc36edfd53233add9908f2f51598666dac22369b18dbf7e572c0ee81cef38929fac2b5c91b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}