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Yeah, but this site uses blocktrades and you can send from any exchange as long as you use the BTC address.

Which site you refer to as using blocktrades? Same thing you mention applies to the exchanges I mention and their spreads are times better than blocktrades.

I was saying steemit uses mainly blocktrades. I believe it is integrated into their system/website. That's why anytime you make a deposit, it says something similar to the below in history:

receive xxx.xx STEEM POWER from blocktrades