this post was submitted on 28 Jul 2023
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Monero
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There’s a bug in some wallet software (that didn’t update) that cause the decoy selection algorithm not to choose outputs that are exactly 10 blocks old, but only 11, which caused all spends from 10 blocks old outputs to be pretty much all considered the true spend.
But generally the more you wait, the more likely you are to be "secure". You can always try churning (wait between a few hours and a few days).
10 blocks is good enough though right?
It's super good enough. The beauty of Monero is it makes private transactions easy.
Because some of wallets didn’t update, there’s still significantly less decoys that are 10 blocks old exactly. Sure it is enough, but you’ll statistically be way more exposed.
The decoy selection algorithm isn’t perfect though, and it also seems like it doesn’t choose enough recent outputs, so that means again you’re statistically more exposed if you spent from 10 to idk like 100 blocks old. Nothing that alarming though.
10 is enough for most cases, 11 is better if you want the extra privacy :)
If you really need the privacy, churn and/or wait at least a few hours.