That's quite another revolution in the crypto world; i would just about love to have some BTC bills in my literal wallet, probably pay my tithes with it. Its a welcome innovation for me.I don't totally understand the idea. As far as my understanding is concerned, it only makes things complicated. I think we just need to improve our current uses of bitcoin than having this. If it's up for security issues, then current hardware wallets could be safer I guess. I don't think it gives convenience.