Love the idea, and I've been talking about this with other cryptos as well. Maybe once I get to be a little more "trustworthy" in this community, I'll contact you for some steem! I actually just was asking someone else if it was possible (or already in existence) for there to be some sort of automated third party for transactions such as this so that both parties don't have to really "trust" each other. I'm no tech wizard, but couldn't one design a way so the transaction wouldn't go through until both parties had submitted their payment to their respective, secure, and refundable (in case of something going wrong) digital deposit boxes, one for each. The program sees the payments in the correct amounts and initiates the actual transaction.

Can this exist? What are the limitations?