{
  "manageEntity": {
    "action": "Save",
    "entityId": "299281799",
    "entityType": "Track",
    "nonce": "0x6b3b934fe98656c1ae8c804efa7f4407be950e7f5f09bb62481484fdffa4e784",
    "signature": "0xeeea3f433fedf21dcd4ca6bc76b309c494d9e985a7b143fd2eebbb2095d432fe5eb4643287e911dff64883dbffebaecb883fd30506014f7b8daeffa0cc31c5761b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}