{
  "manageEntity": {
    "action": "Save",
    "entityId": "529976162",
    "entityType": "Track",
    "nonce": "0xff430642f80a8d3b763d6784e45b4a22e49de8658e1056805b2cd75f782ce8bb",
    "signature": "0xf06ab52f78b21109d65102a254f7ca52cdf872c8849874a007c20a28740f13d003146525a78666bed4b1776bf42e7aefbdda47875d3efd780b2ef6d0f3b9164f1b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}