Rootstock (RSK) promises to bring all of Ethereum's smart contract capabilities and more to Bitcoin's blockchain. Hard to predict the future landscape, but lots of altcoins have been (justly) dying off and Bitcoin's dominance (market share) has climbed over 50% for a few weeks now.
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"The Bitcoin community, especially those are around before 2014, know a thing or two about Rootstock and what they are working on. For those who don’t know, Rootstock (RSK for short) is enabling smart contract development and execution on top of Bitcoin. You can have all the goodness of Ethereum (and rest) platforms on the most secure blockchain, Bitcoin."
read:https://hackernoon.com/second-layer-on-top-of-bitcoin-rootstock-rsk-explained-88ab724222b2