What you want is full transparency and incentive alignment. A government, or rather the people running the government, fundamentally don't benefit from these things because they use monetary policy to benefit themselves and the elite that is currently in control. Of course they need to get re-elected, so they must make it so that the general population believes in their "goodness" - The fed is just a group a people making decisions behind close doors with who-knows-what political incentives.

So yes, in theory it could be a centralized database but I don't think there exists this mystical "global trusted entity" that has the population's best interests as their main incentive because everything within a single nation state is clouded by politics. Banks and big tech are prime examples. That's why it needs to be decentralized, decoupled from specific governments and people in power.