Award-winning Melbourne start-up Horizon State is about to trial blockchain on-line voting in Indonesia. How does it work, can it be trusted and when scaled-up to a national level, how could it affect participation? Plus, might your musical taste provide clues to retailers about what clothes you'd like to buy? Guests: Jamie Skella, Horizon State, Jeremy Kirk, Executive Editor, Information Security Media Group, Ariel Bogle, ABC RN online technology reporter