A few days ago there was a discussion in another thread about whether there were any practical uses for blockchain and someone mentioned eBooks & other digital content. An author/creator could upload the content and then the "right" to access it could be bought, sold, rented, gifted, loaned, etc.

I don't know enough about blockchain to know whether that's actually feasible but it was the first proposed use I've come across that seemed like it might actually have potential.