Bittrex exchange is a cryptocurrency exchange located abroad. You need to have a cryptocurrency for overseas exchanges. This change has never been attacked by cyberattacks because the infrastructure of this change is well established and easy to use, easy to learn even if you don't know much about change. Verification took too long. Customer service is not responding in a timely manner. It has an IOS and Android app. The trade fees are not too much for me which is fine. Almost all cryptocurrencies are available on this exchange. I can do crypto money transactions fast.