{
  "manageEntity": {
    "action": "Save",
    "entityId": "974492445",
    "entityType": "Track",
    "nonce": "0x372a925e8ec8bfd18a9cad1972e16e4e7ff42ab7875c8e9848b639ea5b76230e",
    "signature": "0x36af1a84ad714fdc5284d041ab1e3ce9844507775dc95663bcdf530710ddf4093f8c5cb6dcdf63a5f095b754913758b77e02e41e9bffd52b0a022f8be9c291461b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}