{
  "manageEntity": {
    "action": "Save",
    "entityId": "1895954584",
    "entityType": "Track",
    "nonce": "1791121882672750303",
    "signature": "0x85977ae2bf21ea6b49aa3908dfcdc3de4a665ef6412df9900a476dd6b96a733d0d5cd853c2c391c9f54bf441d560a4a55bfade86a682294994f3c6b8da98273b1b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}