{
  "manageEntity": {
    "action": "Save",
    "entityId": "590739106",
    "entityType": "Track",
    "nonce": "0x0587b5aa4d2898269076fc53bb19632ab18d15eab867073b04b2950689accd0d",
    "signature": "0x20bf47c8ef97cd52949a0612ab0577014a69fad734b3beb90e838f993eacf219421186c240615af3cc551956b00b48d3d3e9ead82773088d76e2eb52386348d21b",
    "signer": "0xC35123bF05ca0B3A7B333c53E47bcd9f9DA864d4",
    "userId": "33896318"
  }
}