Don't withdraw big amount from Bittrex now. They are on the wrong fork, do only small amount. I undertand if you have 600k, it would be a pain to make tons of 100 NJA withdraw.
For the moment, don't withdraw big amount from Bittrex
Maybe if we talk to them they will end to switch on the good fork. The bad fork is still useless, it's a non sense to keep it.
We have see with coinader that it's possible, bittrex can do it too !
i had 100k before the crazyness so i did try smaller ammounts, 5k 10k 20k 25k 30k but none arrived