{
  "manageEntity": {
    "action": "Save",
    "entityId": "148493916",
    "entityType": "Track",
    "nonce": "0xdf0c3fbe661caa1a3aa0899c2cc4b654d6a7393de35611f40aac0e9ca241f53e",
    "signature": "0xe898bf982a599ae58cc606d037376ffe12c11ca8cbb1f36fb96cbc435d6666675570e1a551a47d22ecd7d21e181373c0028ecf9c89138f82248b468e086ecb091b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}