{
  "manageEntity": {
    "action": "Save",
    "entityId": "184869378",
    "entityType": "Track",
    "nonce": "0xbaabbf0d81e3472462837b4d2083800d4eb01e128c03100713bb66b72855c4f1",
    "signature": "0x53d63e252b303db689ef3f1d357105643b1c75d22cfc3a663b6a8367f7bd90640d7e95f15a8aaea37343e52eb03cea7f63c953a312132532f0dc21f444dd5ca61b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}