{
  "manageEntity": {
    "action": "Save",
    "entityId": "779158739",
    "entityType": "Track",
    "nonce": "0x444816729e46e6edda26ea34df6234b7058a32a1cf8282c46b46990a81beeb1b",
    "signature": "0xa6974810b2007735fb79a2e805706ba95c8c934566b40bf708816223c6bddf145b8d075ef208776f6fe281ae7788d48903c363533aa73f02bb2dd3a49b9596071c",
    "signer": "0x0a5148A3f132E6696c1Cd3FDA8465fC5fF17d3D2",
    "userId": "803288761"
  }
}