{
  "manageEntity": {
    "action": "Save",
    "entityId": "663367010",
    "entityType": "Track",
    "nonce": "0x5da4b73cc515444b5dd278881da7f8abaff79235c04b27d72735292fa98c0140",
    "signature": "0x5ea29b9c46f307c38d264556d80beba72122a83c1221274960f85c923a20643e1ac6f45d19504cb743dd7d4f54337b8c0a536fc69957d6d84177cf2560311ffc1c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}