We're hoping to get our sidechain litepaper out this or next week, but in a nutshell... Through a combination of smart contracts, node plugins and wallet plugins, Blockpool delegates will be able to opt-in to forge for other chains using the same core code in parallel with BPL Core for additional rewards above those received for processing BPL Core. The mechanism we've designed will increase demand for the BPL token while providing further incentive for individuals to run a Core node, even if they do not have enough voting stake to qualify for Core rewards. This should have many benefits to our core chain including greater decentralization and stability.

Additionally, the way we're implementing sidechains will make blockchain very accessible-- as a new chain does not need new code or its own independent network as long as the rewards defined by the sidechain are enough to motivate our BPL Core delegates to forge for them.

One thing to note is that Blockpool sidechains will not operate as BTC sidechains have. This is new and different as far as we know.

All answers provided here are bound to draw more questions, so I hope you will have some patience as we document everything in the litepaper.