[organsnyder]

You need a network of some sort, unless each bank has to maintain a direct interface with every other bank.

[giovannibonetti]

The central bank can do that. That's how it works for instant payments in my country (Pix payments in Brazil).

[artificialLimbs]

That seems even less appealing than the sideways system we have in the U.S.

Is there any percent chance that the government doesn't wiretap all those transactions?

[dudus]

Tap on what sense?

The government doesn't hide the fact that all this data can and will be used by the IRF equivalent in Brazil (Receita Federal)

I would assume the same for any credit card payment in the US