Then treat this like a hardware wallet. It's really hard to make trustless, decentralized physical cash which is what this is. If cryptocurrency is to compete

Then treat this like a hardware wallet. It's really hard to make trustless, decentralized physical cash which is what this is. If cryptocurrency is to compete with fiat currency it should be able to do so through all the same mediums fiat can. You can hack these to load them with Bitcoin Cash and make a "Bitcoin Cash Cash" instrument. Previously one couldn't do this, now one can. Comments like this one are why this hardware technology matters: https://news.ycombinator.com/item?id=31656602 https://news.ycombinator.com/item?id=31656602