{
  "manageEntity": {
    "action": "Save",
    "entityId": "402473953",
    "entityType": "Track",
    "nonce": "0x78d931b1d084e1c4cafd33d5bf7ab21b07ded2ba6795144d0f5128ba95f33445",
    "signature": "0x41448e35f083cf33a77666711afb79799182b592fe3bf1c0ab4bc202bdc83e424c52da3d26a69f8d58a61db7bd02b88b0502d92535a64fab7fc47834ec0177221c",
    "signer": "0x0a5148A3f132E6696c1Cd3FDA8465fC5fF17d3D2",
    "userId": "803288761"
  }
}