1. Honestly? Nothing. You could type out AI output from another screen and Realwork would record it. The friction helps, most people won't bother, but it's not foolproof. The typing patterns might look different (copying vs composing tends to show), but a determined faker could game it. At some point, if someone's putting that much effort into faking authenticity, that's a social trust problem no tool fully solves. Realwork raises the floor, not the ceiling.
2. Digital art (Figma, Photoshop etc) works already, recording captures the visual process, strokes, layers, iterations. Music and photography are trickier. Music production (Ableton, Logic) could work by tracking DAW activity, but still figuring out what "proof" looks like there. Photography is hardest since it's capture, not creation over time, though editing in Lightroom could apply. Some mediums will translate cleaner than others.