“‘Blockchains’ could offer crucial intelligence on whether a hacker has modified a database, or whether they’re surveilling a particular military system. Blockchain technology has been slow to gain adoption in non-financial contexts, but it could turn out to have invaluable military applications. DARPA, the storied research unit of the US Department of Defense, is currently funding efforts to find out if blockchains could help secure highly sensitive data, with potential applications for everything from nuclear weapons to military satellites.”
Source: Bitcoin-Style Security May Soon Guard US Nukes and Satellites – Defense One