{
  "manageEntity": {
    "action": "Save",
    "entityId": "1661915879",
    "entityType": "Track",
    "nonce": "0x63ffd658ce6b3f478b1d81a433b9b88494a6a2be7dd9a11bc38f9c9bc8be1fea",
    "signature": "0x5b75841c33cd3509e63e344dc844c4fd47347c21e5faee67f2e14c5167c81d6c47f1fe77d589be3266088e03ad8143c8690f5515bdf0f1387919f99c672070be1c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}