You cannot hope to stop money laundering after the criminal has obtained the illicit revenue, without putting the entire world under mandatory surveillance.

The only viable solution, that respect liberal democratic norms, is to limit the underlying crimes that provide the criminals with their illicit revenue: so prevent and prosecute hacks, drug trafficking, theft, extortion, etc.

And do so using non-authoritarian means: targeted covert surveillance, searches with warrants, informants, interviews of witnesses, examination of public data, etc.