I'm suggesting that the transaction layer is not the point at which crime should be targeted. Doing so requires the entire population being burdened with prior restraint where every they need to jump through hoops for every transaction, and need to give up their privacy altogether.
If criminal acts are generating illicit revenue, then those acts should be investigated and prosecuted. Investigations should be targeted, and done in a manner that respects privacy rights, with authorities obtaining warrants before searching an individual.
Real criminals and crime leave all manner of evidence trails. The dragnet surveillance approach to combating crime, that requires doing away with foundational rights like the right to privacy and the right to be presumed innocent and to freely associate, is not justified in any way.