I think such a feature does not need to be in the blockchain itself. Steemit.com has it, Steem keychain has it. And if you have a qr code, the company providing the qr knows it is correct and you can verify it with your frontend that asks for confirmation.
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You have completely missed the point
Sounds like a confirmation mechanism.
What the handshake gives you is a blockchain proof of the seller confirming that the tx is well formed for whatever purpose that means. And I don't see much value in that so far.
But feel free to make a point as to why this is the next killer app.