{
  "manageEntity": {
    "action": "Save",
    "entityId": "721891",
    "entityType": "Track",
    "nonce": "0xa9b134b94879071a6cb29f927ddb9f6c053e7756abbc487314c111668de64079",
    "signature": "0x7d81aa8b312ea9c76e7d81abbf5eeec95faa9ab9084b86944585e8ff51ad09696f11533a493017270029c453960e5cff0a6b2af6c9a4b6ae2688f59103777b861b",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}