{
  "manageEntity": {
    "action": "Save",
    "entityId": "487139818",
    "entityType": "Track",
    "nonce": "0x343ac302d0c5886efab19cdaef6a1291a79f2bcde08cc4d518763a80c3135778",
    "signature": "0x1170335a569169116792259a6ed3926ac2d9259f5482d189cf6640f4e14bd45f2ac93092c7418ccc9d1b8f93f6d422f4119e69ab0a1eeb87ee7fee3b059af31b1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}