looks like cash has solved (most) of this some time ago:

- V. costs nothing to exchange a bill

- V. link to a real economy so little volatility (except when the real economy implodes)

- V. accepted everywhere within a currency zone

- V. mostly secure (ofcourse theft is as old as humanity)

- V. private (only your counterparty knows about it)

- V. fully integrated into financial accounts / tax systems

- X. fast (local) transactions but remote remittances outside a currency zone a serious problem (expensive, slow)

- V. counterfeit tech very sophisticated

- V. you can print as much as you want

The major flaw of cash is actually linked more to the international system of currencies (which underlies many more socioeconomic problems)