{
  "manageEntity": {
    "action": "Save",
    "entityId": "1383844527",
    "entityType": "Track",
    "nonce": "1788349021847729705",
    "signature": "0x856965ef205c038408b8113c0d111a7fb844bfea11b85578d819187ca399987c48674133e6506b02adf62bf08f3c19201bdc62dc19e78e9302040dd861ba786c1b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}