Sovryn (SOV) is a token system based on smart contracts for lending, borrowing and margin trading of bitcoins.

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Sovryn

You probably don’t know the name of @SDLerner, but he famously pioneered blockchain analysis with the Patoshi Project – which assumed that Satoshi Nakamoto mined 1 million BTC + proved that none of it was moved. 

He also created & launched the first Bitcoin sidechain (RSK), and…

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Bitcoin Pioneer @SDLerner says sidechains are obsolete! That's coming from a guy who cofounded and built Rootstock, the most successful sidechain.
Sergio - why are rollups superior?

Bitcoin Pioneer @SDLerner says sidechains are obsolete.