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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 0.13
TRX 0.23
JST 0.031
BTC 82716.06
ETH 1812.57
USDT 1.00
SBD 0.72