{
  "manageEntity": {
    "action": "Save",
    "entityId": "1752471779",
    "entityType": "Track",
    "nonce": "0x51161441b317997f75c77e6587f047c9551d3c807a4947d200b011b9b8c86e14",
    "signature": "0x90058455ff7337b25788519f4f2606e070a344f50eefa7038e02d99c3725626246d3d85c0adb528dd0935e185a1ace20a040035200566a184851d19b9ea562511b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}