Blockchain or I should say marketable blockchain technologies are still far and few between. We see use cases that make sense either technically or in theory but rarely do we see it as a real life marketable and usable platform. This is a good article discussing some use case where blockchain may be usable in cybersecurity.
…Owing to their distributed nature, blockchains provide no ‘hackable’ entrance or a central point of failure and, thereby, provide more security when compared with various present database-driven transactional structures (access the full article on InfoSec Magazine here)