"also, as time goes on, the proportion of btc that are "dirty" approaches 1"
I don't follow what you're saying here. Nothing stops something from being dirty multiple times, does it? So nobody might care that it could be traced back to something sketchy 5 years ago, if more immediately it's traced back to last month's crime.
I don't follow what you're saying here. Nothing stops something from being dirty multiple times, does it? So nobody might care that it could be traced back to something sketchy 5 years ago, if more immediately it's traced back to last month's crime.