You can certainly do it. But then the problem being solved is "keys are bad". Typically in startup lore you want a product to be 10x better than the existing so

You can certainly do it. But then the problem being solved is "keys are bad". Typically in startup lore you want a product to be 10x better than the existing solution to gain mainstream adoption. I have a hard time picturing smart locks to your doors on the blockchain as being 10x better than keys.