{
  "manageEntity": {
    "action": "Save",
    "entityId": "515831297",
    "entityType": "Track",
    "nonce": "0xf9cfb94fed663a758f7c8512575706d9f0e505d5dab673efd5b5507410af00a4",
    "signature": "0x157cfb981043765c17ef7a324bb58d0bca6ed4d6e22d8e0312d7f740009b22342e26ca635a2debc18173523d99d1cb380d8a9c12215963cf2fe82978935ad6cc1b",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}