{
  "manageEntity": {
    "action": "Save",
    "entityId": "1619579719",
    "entityType": "Track",
    "nonce": "1785345223578994848",
    "signature": "0x69e7682193270797f747fe8f5ad60a5bacfffef50b055fb037a97ffd0678dfeb54f3db1b8dbad74a9cd8ae61b9a45f28827689f6b92153ceba39d63159eaebae1c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}