{
  "manageEntity": {
    "action": "Save",
    "entityId": "1325141579",
    "entityType": "Track",
    "nonce": "0x572d9ef01b0e2d80bfd0accfb72c48289f7bb1011b308c8f2d65fadf8f3c866e",
    "signature": "0x9f453f86bd358354b2603273ce88afc02ed22c0ff99f2cca5c3827befa041c0b7c3956455099d553e5d7b86860888fe37be542d37d196f5bbeccdeaa3b90ca131c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}