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Really? My SALT has been offline for days, which I just confirmed here:
https://bittrex.com/status
Also Siacoin, Golem, and ZCash. In addition Ardor has been "preparing for swap" that should have been completed days ago.

Derp. I now see that both SALT and ADA have been down since yesterday, both flagged as "routine maintenance". So yeah - definitely a tad unnerving that "routine" = "down for days" in Bittrex-land.