Hi I’m a transaction processing systems programmer who works for one of the top 5 global banks. So basically when money is actually going from one nation state to another it works like any other monetary transaction would, it just happens in a way that is extremely regulated, reliable, safe, traceable, and able to be validated. Governments hire banks and become their customers the same way a person would. For instance we have whole areas of our functional department that support Treasury Services, Global Funds Transfer, etc. These sorts of monetary transactions are why mainframes are still and will always be an integral part of IT infrastructure for certain companies.
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