{
  "manageEntity": {
    "action": "Save",
    "entityId": "1401476747",
    "entityType": "Track",
    "nonce": "0x988107b5ea09b3211f9a9f832ff1b46932344dffd428c9213281bcd162e9d12f",
    "signature": "0x8ab3aef995654fdb9f1a6151693aca9f6eba24b807df0b3624d1f173dd9605364a18ba558112c25a43b0942182403925d97c29791a0aa9cedec38dd7535788171c",
    "signer": "0xC1896EAF7ae2431A08647A163291b5a8A0cd2a6C",
    "userId": "185209372"
  }
}