But aren't sidechains proven impossible to secure? I have no idea honestly. I have only read about it while doing my reading about Bitcoin.
Another thing I'd like to know is considered Lightning a sidechain?
My understanding is sidechains are secured via the parent blockchain hashing power. Which is why it makes sense. Then the side-chain can have different ratios of value to the main chain, and in effect "fill the gap" for lower-end purchases.
Can you post a newbie friendly article about sidechains? Some good discussion threads about it would also help. Thank you.