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Not as things stand now. That's a whole new ball of wax. It's beyond my tech grade, so I'm not sure what's involved. My guess is that it's not worth it, since you could just move them over to Polo and trade there for SBD, BTC or ETH.

Internal trading of btc could be very useful to the community here, but if there was a chance that it would discourage trading on bittrex and polo, then that would NOT be good for steem as it would be less visible to speculators who are not on the platform.