I don't know that much about Blockchain, but it seems like some time last year a blockchain was compromised or weaknesses (turns out it was
Ethereum Classic where someone took control of 51% of their computing power and was rewriting transaction histories) were found in it. I am also suspicious of anything that becomes a buzzword used by marketing types (e.g. "the cloud"), also given the nature of government (and corporate) contracts, I can not see it being "Secure" remember, a kid hacked in to NASA because no passwords or default passwords were used, then you have the Target hack which was from an HVAC system, then the whole fuckery that is/was Equifax).