{
  "manageEntity": {
    "action": "Save",
    "entityId": "1489224015",
    "entityType": "Track",
    "nonce": "0xc9abc8f0a2eead0e71911ace57bca7c8a399e671109b8c6fdba19e8ed427687d",
    "signature": "0xe7073141e83c9fcd2582167166b2cc3018401cbe9037a1784de3017f7a38d82a59e8591c5e22600aa886a54189f2f9cafb2d69b290a5d39ae1b55ded4ef41ca11c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}