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Yeap that's the point of the post :). I'm not a programmer but at least I can spark the idea so other more knowledgeable peeps work on it.

I've heard that the marketplace is in works anyway. this escrow thing wont be necessary then

Any links ?

https://steemit.com/sip/@dan/escrow-sip-steem-improvement-proposal

The motivation for this improvement proposal is to facilitate the creation of a trusted online market place and peer to peer trading.