{
  "manageEntity": {
    "action": "Save",
    "entityId": "940381998",
    "entityType": "Track",
    "nonce": "0x5574555cf57b40cee8f66a01b45fc4c8bb59c5cdc344b1ba4aa7ffe782ec6a82",
    "signature": "0xdcb9eb9369c2ea75c054acfb2863e1959a208e855f02a7514aed506c2ae31630339bcb58523751b629f95ac720be2dc31679d354ad66c16f591943ac1e6abd941c",
    "signer": "0xbb3E94A6Ca25f3CAF1B8487768C074bE200e6381",
    "userId": "277460613"
  }
}