The distributed ledger of blockchain has found application in many fields, from cryptocurrency to supply chain. Security professionals are finding that the qualities blockchain brings to a solution are effective in securing data, networks, identities, critical infrastructure, and more. While excitement over blockchain’s potential grows, it’s important to keep that potential in perspective. No intrusive hacks have been demonstrated yet, but it’s wrong to say that blockchain can’t be hacked. In early 2018, a “51% attack”, in which a threat actor managed to gain control over more than half of a blockchain’s compute power, was effective.”]
Source: https://www.darkreading.com/application-security/7-ways-blockchain-is-being-used-for-security