{
  "manageEntity": {
    "action": "Save",
    "entityId": "1323896748",
    "entityType": "Track",
    "nonce": "0x4b5dbe046fd5cbbea7d8a9d4dec4ea3134b490177635a359f18f9f3d81a9f8f4",
    "signature": "0x480bea68cff6c6d67ed91b728692005a25fe893d3bb2e06898a4bf5a14a466b33713087994324ff01454ce4b59ef68686ae10e277a46fd76e2e6a56f4405d1001c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}