I could go for that.
Smooth is right. SC'S are just sophisticated forms of altcoins.
Nop, only you focus on that.
sideCHAINS are altCHAINS that allow for bilateral movement of assets (bitcoins) between them.
sideCOINS are effectively altCOINS supported by the Bitcoin network.
I suggest you read the paper again
It appears that we desire a world in which interoperable altchains can be easily created and used, but without unnecessarily fragmenting markets and development. In this paper, we argue that it is possible to simultaneously achieve these seemingly contradictory goals. The core observation is that Bitcoin the blockchain is conceptually independent from bitcoin the asset: if we had technology to support the movement of assets between blockchains, new systems could be developed which users could adopt by simply reusing the existing bitcoin currency2