but you would have the same level of security as when every single computer on Earth gets automatic windows software update every day from a THRUST worthy address such as Microsoft.com (instead of NorthKorea.com). Otherwise all of Earth's computers would presently be infected by viruses but they are not.
That alone would defeat the purpose of Bitcoin won't it? Making all of the computers ping certain centralized server is not good. There is really no such thing as "computer security", there are tons of zero day exploits which could be used by any adversary before it gets patched.
From what I can tell, you're basically describing something like a centralized banking system but instead of bank officials, miners are the ones that regulate this. It would be good if you could read up more about Bitcoin first and its derivative protocols. I think Lightning network would interest you with this particular aspect that you're talking about.