The OPEC+ nation such as Russia, Saudi Arabia or United States want to sell their oil, gas to the market/to other nation then instead of choosing any national fiat currency such as US Dollar, Euro, Yuan, Yen, Rupee, etc., they now instead will only accept oil certificate paper, gas certificate paper.
What's the difference between this "oil/gas certificate currency" and the national fiat currencies of the oil selling countries?
I don't see any difference. This so called "certificate" would only make the trading process more complicated.
My oversimplified model looks like oil>money>other goods and services. Adding a certificate to the model would lead to oil>certificate>money>other goods and services. There's no need for such certificates and I'm sure that many countries around the world won't accept them as a real currency.
I think that is the final last way to end the current oil, gas currency war.
There's no oil/gas currency war. What are you talking about? Saudi Arabia has no problem accepting Chinese yuan or other currencies for it's oil.
I think that you are trying to find a solution for a problem, that doesn't exist.