Or is the trick that you indeed can trace which transaction uses which other transaction's output, but cannot identify and equate the recipients unless and until they are spent as part of a same transaction? How is that different from always using a different bitcoin address?
Can anyone explain to me how ZCash prevents double spend? I can understand hiding the sender, recipient, etc., of a transaction, but then how do you make sure it's not spent twice? You need to somehow flag the spent outputs at which point you can trace which transaction uses it.
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I haven’t looked at how zcash does it yet, but have you seen how Monero/cryptonote pulls off the same feat?
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