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STEEM as well as Bytes (byteball is the name of the Platform, and that's not for sale) can be traded to Bitcoin on exchanges. I believe all three have trade pairs on Bittrex exchange.

Coin Marketplace

STEEM 0.17
TRX 0.24
JST 0.034
BTC 95765.45
ETH 2743.11
SBD 0.43