The silver penny was in use in its pure form for around 500 years.

In the Middle Ages, there were several occasions when old silver coins, such as the silver penny (at 1/240 British pounds), were withdrawn in an exchange ratio of 10:9. This means that 10 old coins were exchanged for 9 new coins. Only the new coins were valid on the market.

Unfortunately, something like this can also be realized with Bitcoin. Only valid Bitcoin if they were traded via a government address. That's why Monero should always be kept in the back pocket.