{
  "manageEntity": {
    "action": "Save",
    "entityId": "580562020",
    "entityType": "Track",
    "nonce": "0xddfe7fd6cc1afdc46b7f499cd1cffb454529d2be9473cd241f4ce01dc3d746e1",
    "signature": "0x9df2cc387f43261a8271b258243c2a0dcf2841738a167eb80fe5677fcd753b171e8cf0039e3a29a15ac6149c56d0bddd9aa5f67889adf9914c02d63f67a683811c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}