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Bittrex is not decentralized. The dex is. That's why I like it and much prefere it to their centralized counterparts.

Could you tell me more about the dex?

I sure can. The best is to head over to Bitshares and download it:

https://bitshares.org

It is quite hard to set up, so take your time, get the account details right. Then get to know the different parts of it. It is a very detailed package and daunting if you are not used to exchanges. The nerds love it. But I can understand those who find it too demanding.

You can get some coins to start off with in the daily giveaways here on steemit.