{
  "manageEntity": {
    "action": "Save",
    "entityId": "619069",
    "entityType": "Track",
    "nonce": "0x90034bc1a7ef2e8d5115b9e20ffbf851d1e528d718ab8ab99a911f60218513c1",
    "signature": "0x33184cb56594f0d2b51f5804986949a9836dd33ca6d9536b9e0bc3f074d1bb651bb6d88033df69fde569b9768d08cd401a1dbe22c30d4497441f55fc111e876e1c",
    "signer": "0x4D8EDeF47b57f98c89BDFf851267B0327BE4cD05",
    "userId": "5307724"
  }
}