{
  "manageEntity": {
    "action": "Save",
    "entityId": "388681",
    "entityType": "Track",
    "nonce": "0x087ef70932b4698fc39a512f316b275cdbda13d7dd6dee330e4ae607b42d0384",
    "signature": "0x3f9c2bdd06331906fad35f31452e599de6881edea6f93788e95da238da69a7d21718c6643ad02115f283940249bc95ad01345437691458112dff29517cd662b01c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}