There'd need to be a lot of work making sure that it's safe in that: a) Losing it should not expose your entire medical history to whoever picks it up b) Losi

There'd need to be a lot of work making sure that it's safe in that: a) Losing it should not expose your entire medical history to whoever picks it up b) Losing it should not mean losing your data forever. Giving the consumer the responsibility for backups is not a solution either, since those can be lost or stolen as well. c) It has to be tied to the person's identity, so you can't borrow/steal your friend's to get meds d) Can't be tampered with or forged to fake conditions or clear conditions e) Records who edits it, when, and a diff of changes. f) Records who reads it, and when g) Resistant to physical damage or water. I should be able to go swimming with this device or have it go through the wash without worrying about its safety. These are all pretty hard problems on their own, and together, you'd have to design pretty much the world's safest storage device. If it existed, I'd put my SSH keys on it too!