{
  "manageEntity": {
    "action": "Save",
    "entityId": "739529448",
    "entityType": "Track",
    "nonce": "0x1c222e7668024098ae0cad22eefe115a06cd630a4acf7cbde7f22f83008ae041",
    "signature": "0xd564812f2fdcd5fd6389b5b6c42a2730897777cf19f721949357d89e0827d6734223924abdee60e8feba21d7653179cde64d2fa30002d96a9452905f5a2cef0b1b",
    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}