{
  "manageEntity": {
    "action": "Save",
    "entityId": "1142787428",
    "entityType": "Track",
    "nonce": "0x77c17f666323844a8809ca6ce84063c28791b0e0b05bf1cdab90b69d20910246",
    "signature": "0xa15ce08d9d46199c0a00ff104016db1ac33eda15f64d59ecf76975e3c0e06f2f0572e22c94f40f42bbdb36ca8b67329a2dbe71c12e57f2ed8bd279365d434edc1b",
    "signer": "0x2D566E1DaC6fc148a694abe846B32e39B6584aa5",
    "userId": "890889753"
  }
}