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Yes you can.

But not all crypto. You need an exchange that allows it and have sufficient volume.

Currently you can short BTC and ETH, but that's about it.

No you can't short Hive :) :)

I would short hive if it was possible but shorting eth and btc? I'd have to be out of my mind!

Well I wouldn't short BTC either. But for a trade it is acceptable. There are many down days on BTC. They are profitable