The blockchain voting concept comes from the world of cryptocurrency. It essentially means that multiple copies of the complete voting record will be stored in multiple locations, so that even if someone were to tamper with them vote, it would be child’s play to discover what they changed and when. Blockchain voting promises perfectly secure election tallies once the vote has entered the system. This may even be accomplished with paper tabulation. This would give an additional level of security at very little extra cost.
It should be noted that blockchain voting would be excellent to contain a simple data set (such as the six million citizens of Kentucky and the twenty-five or so votes they cast in a particular election), but it would not be useful to contain complex information like voter registrations. Voter registration would never, ever be stored in an insecure location.