{
  "manageEntity": {
    "action": "Save",
    "entityId": "498092501",
    "entityType": "Track",
    "nonce": "0x8972737e024686a3e3a26d191f0be2ab96c8c797ce0464d0be99dad700938505",
    "signature": "0xd86f055865182e4a9d043745ffea6d54faec6425ffb4cc9c3e3b2caf2913db6b5768c2d8d7f55fb71d03f68be3ee27518137553a82e560e8943928e18bae2fe21c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}