for thousands of years we've had coin or paper based currency.

there's no need to change that.

what would be really really interesting, is someone develops a device that computes POW on bitcoin transactions, perhaps it runs on a raspberry pi, or something.

said device would become a "wallet" and you would have a little receipt printer on it, and at a business - it would...... you guessed it, you'd pay the business, compute the transaction on the network, then you'd print out the receipt, give them one, and keep one.

something like that.

why this doesn't exist yet, I don't know, but it shows people are not really thinking yet., or if it does someone correct me. better yet why dont you find someone to make it, because i lack the capacity to do so.