{
  "manageEntity": {
    "action": "Save",
    "entityId": "388923371",
    "entityType": "Track",
    "nonce": "0xeab048623f22f3d2e4045d8ae75da1bd8a2eb4fa38161afebb67465b03bc8958",
    "signature": "0xbbc45c019c88a7a342b326ff65ff41781d7bdf3fdc77b5b290e58c62280789457f294852639f62fb14945a60f1ad73576114fa1ff8cfedfb3f4fad6aa960e6b01c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}