{
  "manageEntity": {
    "action": "Save",
    "entityId": "492885398",
    "entityType": "Track",
    "nonce": "0x04980602f323fafd0e32dc607833c23fa397ca17e2b9a2ec5bad97d900d3efd3",
    "signature": "0x4b9693661852f976e77b64af7898a83de2293f820266bfece8918cdccd3fd64a6495bfbfc745f00b970c30a0a696d5aecf6e29550cab5445271432d9f05b59901c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}