The problem lies in centralization, how will these currencies maintain the link to those values, and will they be able to meet their actual value if real crises occur, for example, the price of a barrel of oil in futures contracts was less than zero dollars in 2020
[1] and today it is about 100 USD
[2]? Who will be able to pay this money?
In other words, what is happening is speculation in value without having a reserve, and therefore at some point it will be difficult to meet the requirements for the value of oil at the time of sale, unless what is meant is a real purchase of oil barrels and its storage, and therefore when buying or selling takes place, you exchange those shares for real oil Or salt or something else.
BTW, USD is linked in one way or another to oil, and most of the buying and selling of oil (80%) is done using USD.
[1]
US Oil Prices Fall Below Zero For The First Time In History[2]
https://www.marketwatch.com/investing/future/crude%20oil%20-%20electronic