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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 0.16
TRX 0.15
JST 0.029
BTC 58399.10
ETH 2475.73
USDT 1.00
SBD 2.38