It seems i'm a bit offside... what's exactly the problem with bittrex? 
they blocked hundred thousands account for any reason, reset users already registered and asked for documents for registration but after few months peoples who sent their documents are still blocked and can't withdraw theirs coins
they don't answer to support
they didn't block me but blocked 2 friends of mine and for now only one has been unblocked, the other wait for 1 month
we 3 are french
i lost btc on cryptsie i won't lost on bittrex