Look here tweet of Vitalik about ZK snarks
https://twitter.com/VitalikButerin/status/1043445576044560389?ref_src=twsrc%5Etfw%7Ctwcamp%5Etweetembed%7Ctwterm%5E1043445576044560389&ref_url=https%3A%2F%2Fforklog.com%2Fvitalik-buterin-predlozhil-masshtabirovat-ethereum-posredstvom-tehnologii-zk-snarks%2F