I think most countries that are worried about traceability (of cash) would simply require proof of origin: eg. bank withdrawal even if from 20 years ago; or hou

I think most countries that are worried about traceability (of cash) would simply require proof of origin: eg. bank withdrawal even if from 20 years ago; or house sale or... whatever that provides the proof that the cash in question could have originated from a legal, taxed source.