{
  "manageEntity": {
    "action": "Save",
    "entityId": "545285958",
    "entityType": "Track",
    "nonce": "0xff1f2376fca6057e202c9411864b492b0ce4f707de5785b9b431fecfe99aee53",
    "signature": "0x26fcd970d3854cbc6c1993c64d01c93bb7f1458ead291a02da0154c94ff773f2590a50951f581f108a21d7ad345cd39d8a123ff0084787291397d09909a9a0b01c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}