{
  "manageEntity": {
    "action": "Save",
    "entityId": "545649",
    "entityType": "Track",
    "nonce": "0x17c2836aac4e838585eac5eaf4d548c1b2ee23908267c683cf3795063dba5f5f",
    "signature": "0xa37810ed9cb65a97c38d39f80011d36d181e4bcdc52b87c854368b1546f070c0274926bd4d44684d7ffcda4e4308b729d24387346fbc92f702c1efbc65eb777b1c",
    "signer": "0xa8E11aa224d2579f5cbdb912866bCE84Eb10f9dD",
    "userId": "951616224"
  }
}