Honestly, I have no idea why would anyone need that. Money is not value. Money is just a way of keeping track who is owed by future society how much value. It's a way of keeping tabs who gets to consume in the future.
When rich people hoard their money it's not a problem, you can just print more money to replace what they sucked up and hoarded. It's exactly when they try to spend it where the problems start to show up. Because they are doing it stupidly causing at least some inflationary pressures but more often than not societal and environmental harm.
Countries should make every effort to make spending their money as hard as possible for the rich people. Disincentivize them with high (and highly progressive) luxury, investment and real estate taxes. If that causes them to hide their money to avoid tax, even better. Every dollar of rich money hidden is a dollar of value not wasted by society on servicing the rich and their whims and gambling.