{
  "manageEntity": {
    "action": "Save",
    "entityId": "669184487",
    "entityType": "Track",
    "nonce": "0x6018b255249f4002b76de053dedd5069e42dc12cb3e4662ca827871f1ab380a9",
    "signature": "0xbb291d01c3e6bb72e6f2469c3c55da420be6937494ed870ee54cfa6f73135c366319d0e3c5918a373458bd95a5a5b48dc836a2759e496f64ebe29a06d20b80681b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}