{
  "manageEntity": {
    "action": "Save",
    "entityId": "303041267",
    "entityType": "Track",
    "nonce": "0x8659b898a59a58b72eba54c5e675b4e353432d38199e2d4e865aa64baaf83c72",
    "signature": "0xcdcadaafadacee035286d46c5286a6460c498b8c9600df0861253d8c4313c4871902197ad382e6d1683210efe9104e6df357435b9b6f059efe5876d3c35cfce51b",
    "signer": "0x2f890F488c7DE6221893B82B90bea73E2304cE3E",
    "userId": "344578316"
  }
}