Blockchain the transaction record is immutable and sure can be shielded but certainly not efficiently. There is no getting around the money flows are in the block chain to be pulled out and figured out unless your willing to slow transaction rate to where cash is more efficient.
Feeding a small scale money launder 1,000,000 dollars in twenties is the way to find their banks, the fronts, their lawyers, their cleaning people, who sells the boxes to keep all the cash in, their cook and their associates.
Blockchain the transaction record is immutable and sure can be shielded
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Us older folks don’t consider electronic “ money” as money. It depends on electricity ( and other weak links), when that fails, e money fails.
The hurricane in Florida ( and grid down in Europe) illustrates exactly how worthless e money is during electricity failure. The only thing accepted then is cash, a tangible that is held in your hands. Due note Spain and other areas locked up tight, no buying, no selling until electricity was restored, about three days.