During last month we heard a series of news about exchange hacking from binance to cryptopia(which led to the shut down of this exchange). This thread is open to discuss about how exchange hacking can been prevented or minimize with the aid of Blockchain. My first suggestion is that there should be a special protocol for generation of wallet addresses used by exchanges. This addresses should have an attributes and methods of preventing hackers from moving fund. Each mining node should act as police that will always check for malicious attack on these address by blocking movement of large amount of BTC from any address own by exchange and verification should be done before such move.