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Steem and steemit is it own blockchain, not built on anyother. It could in have an Etheteun 'Market Pagged Assets'. But is something I think steemit will never do. Then again Steemit is open source. So some else could make an app to for this.

Got it. There was some app, i can't remember the name, but it was talking about linking blockchains together, so who knows, they may all be talking to each other one day!