I have no reason to launder money, and agree that the government can and probably does know the identities behind most addresses. I was responding to your spec

I have no reason to launder money, and agree that the government can and probably does know the identities behind most addresses. I was responding to your specific point above, that some ETH would be "dirty" and some "clean," and potentially have different values. Because of this sort of inadvertent mixing due to ETH being account-based and fungible, this is not really a possibility. Dollars of course are the same way: account-based, fungible, all worth the same.