similar) contracts?
Very interesting.
Sure, there are actually examples in https://t.me/bchchannel/393863 which was posted for your benefit but not obviously a reply to you.
partially, the UTXO you trade against is like that, but you combine it with a signed UTXO of yours when you "take" a trade
So basically, in order to solve the confirmation problem, we to have (again) solve Byzantine Generals problem. Ultimately it so often ends up with this... So some sort of "PoW inside of PoW" would be crucial to make the confirmations near-instant.
Personally for me anything over 30 seconds is basically a non-starter. Preferably, 15 seconds max. This is bearable in today's times.
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