Spain rolls out MiDNI, a secure digital version of the national ID card, allowing citizens to identify themselves using their phones. The new app, MiDNI, is now available on all the usual platforms and has been developed by the National Police and the Royal Mint. It generates a secure QR code, signed by the police, that you can use just like your physical ID – for checking into hotels, opening a bank account, signing paperwork, and more.