Digital currency to 'replace' physical currency.

Gone are the days of storing physical coins that could increase their value in the future. Instead, we have digital coins with a dog on it and can be lost via hard drives dying.

This also includes items like credit/debit cards, gift cards, and pre-paid cards. A single piece of plastic should hold less value than natural metals like copper and nickel.

Something with actual mass should hold more value than something without mass (data).