We all have heard about the hacks on many exchanges with millions
of dollars being lost. Despite this many exchanges still haven't improved their security.

ICOratings.com published a list of exchanges according to their security score.

• Coinbase pro has scored the highest with 89/100
• Okcoin.cn is placed at the bottom with a score of 15/100.
  

Cryptocurrency has changed significantly since the inception of Bitcoin, but the number of
security breaches on exchanges remains unaltered.

https://news.bitcoin.com/54-of-cryptocurrency-exchanges-have-security-holes/