The key breakthrough is to remove the simultaneity requirement (lol, I am the one who fixes Gregory Maxwell's broken CoinJoin in 10 minutes of my spare time while my head is deep in designing a programming language)
And, sadly, the margin of this forum is too small to include the proof.
Should you one day find a margin large enough to contain substantial reviewable work in your lengthy tribulations through the Internet, give us a shout.
Enjoy your snobbery (just like your xerox copies Shen-noether and Gmaxwell). It won't help you. You only make me hate Monero more when you do that.
I am moving too fast to worry about your need for a proof. You think I care what you think. Why would I? Are you offering me anything. Can you help me create a programming language. Can you help me code a crypto-currency. Will you pay me anything for providing a proof. No.
Monero = Communism.