{
  "manageEntity": {
    "action": "Save",
    "entityId": "21963822",
    "entityType": "Track",
    "nonce": "0x51e75ae1a71971ec72d99268c2eb0d3038f965a0660b76464f86e9262b31e7f0",
    "signature": "0x652569ce9483e1b7a3fce2d0bd4da063c8a08743b7eb96aab34bf22fb5fdfdb075a12093b5864ae2d819c82935f96cb746685ff05906eb9b2f0ed704804a28421b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}