[utrex]

Your argument is a little extreme, but with good testing you might be able to prove it in most cases.

A few interesting concepts: Cost of carriage: a fistful of cash is easy to carry, but a truck full of benjamins is not.

Should it be possible to make recordless transactions? What kinds of transactions? Are there exceptions?

Who should profit from containers for cash? (Visa network fees, the cost of a leather wallet, the cost of computation for BitCoin, the bank)

I've run out of time to keep whiteboarding ideas before I catch my bus, but, to summarize, I sympathize with your desire to do good in the world but there are a lot of ways cash is used that you might consider as you work on this idea.