I think sidechains don't interact natively with their main chains, whereas the whole idea of child chains (at least in the Ardor lingo) is that they're completely native to the main chain. So you can trustlessly trade on-chain between Ignis and Ardor tokens, for example.
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No just read on it: side chains interact nativity only if the main chain agrees to interact with it nativity ie...core adding decentralized two way pegs for rsk.co
By the looks of article i read child chains are decentralized sidechains removing the peg idea with letting trading idea.
up to you
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