I saw this a few days in the DARPA SBIR&#x2F;STTR release. My understanding is that they do not want to use a public blockchain, instead just utilize blockchain technology across DoD servers to make them less susceptible to a attack, while also giving clear transaction logs for certain military requests that have compliance needs.<p>The private blockchain will give them state machine replication, some kind of method of encrypted authentication, and a platform for transaction verification across military&#x2F;dod (or whatever the specific use cases are). The communication bit could work as well since they don&#x27;t have to store the messages themselves in the blockchain. Since the blockchain is private, this also somewhat solves the problem of transaction speed. There would probably be some lag, but probably just a few seconds or even less if optimized.<p>Something like Ethereum (with whisper and and swarm) could work if they were looking to use a public blockchain, but they specifically reference Hyperledger.org in their publication.