{
  "manageEntity": {
    "action": "Save",
    "entityId": "750336542",
    "entityType": "Track",
    "nonce": "0xfaeabf1f334c453de258ef5d021451b49d36b75b2fe1935c66aa9a5f0a6fb694",
    "signature": "0x6a5fb2fbca1ed029a50474e2a014b50aebb34f85b52772e7ebdf9f6709a6313d363ccb9d3d17630471a5eb8a3db4bded9b39f709d18e9f2759566a794877f79c1b",
    "signer": "0x4A3D09CdfD42dE4C57dc67B09a40B5d9172bD69f",
    "userId": "787102835"
  }
}