{
  "manageEntity": {
    "action": "Save",
    "entityId": "1510020615",
    "entityType": "Track",
    "nonce": "0xf8ce9d96f2f49401ac37123c0e9f4a2b9b6d25c3cb504ffaa8ac62438e3e5ce2",
    "signature": "0x70ed56618415f0e950171d416dc555068ff4f71ab07a5a44bde267f04c668be8518013ff6e0a8639f1e11414d869aee3c3bbf89761184365bdd6deb53d416fee1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}