The first principle with money is to have one source of truth. E.g. a single mainframe through which all transactions run in real time. Anything else will be

The first principle with money is to have one source of truth. E.g. a single mainframe through which all transactions run in real time. Anything else will be hacked because there's money as incentive. This means accepting latency and rejected transactions. There is no simplified version of this...that won't be robbed easily. Good luck.