{
  "manageEntity": {
    "action": "Save",
    "entityId": "603261571",
    "entityType": "Track",
    "nonce": "0x60cb3018be81dbe1726ff8b2cab62e3b2a14ca361cd73ffcda163a0cd5d7d264",
    "signature": "0x095ca3de2a57ae047266cd6db420154f9ab40fc8503b2f575a148f0cbb81b0103e70c1767d2b84abfbc39d304e449dcb6004185a4d1b0f51db34f34473c9ed211b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}