I think stealth addresses combined with zk-snarks would obviate the need
for CoinJoin. zk-snarks could be used to hide the coin's value and
stealth addresses could be used to hide the recipient for payments and
even mined coins. More info on zero-knowledge snarks:
http://cs.tau.ac.il/~tromer/
I'm not sure how well this would work.
Sure it would provide honest historical pricing, but those who wait for
publication confirmation may be at a disadvantage -- to get the best
deal possible Bob would connect to as many nodes as he could, examine
the stream of unconfirmed asks coming in and
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