The obvious place for enforcement is exchange to fiat. In the end, one might expect these tainted coins lose their value w.r.t. clean coins. After all, some pe

The obvious place for enforcement is exchange to fiat. In the end, one might expect these tainted coins lose their value w.r.t. clean coins. After all, some people will only accept coins that can be exchanged for fiat, and everyone prefers coins that everyone else will accept.