{
  "manageEntity": {
    "action": "Save",
    "entityId": "552776622",
    "entityType": "Track",
    "nonce": "0xa68457345fe3c8e07a148ea97cc097f181920f479d7117a24072c36a383db744",
    "signature": "0xac7ed4c513ede7150a4229e8f77e1484537936c852dea4cae08ed28e5bfa6c142b81c1239e272fcc6fc895646ef9bb53b5899d8e4262f2de8b999ae7e574dc441b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}