{
  "manageEntity": {
    "action": "Save",
    "entityId": "1685335606",
    "entityType": "Track",
    "nonce": "1787541582861902699",
    "signature": "0x5387f9676896460023013a60d24a67fb0c3501e931e256a552fb2761dd4fa8a50cd87f7d144b03deb390c1823c1de979bc5940445e9439679d10a7559d677de61b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}