- Transaction outs with guaranteed anonymity. An additional attribute for out is added: it can ONLY be used in the transaction with mixin level in ring signature not less than a given number. The feature is added to ensure the user's anonymity of transactions ring signature over time.
I might be missing something, but wouldn't it be more effective to enforce the mixin level on a more global level? Mixing in a key which appears somewhere else in an unmixed fashion will be less effective against smart blockchain analysis, after all.