Could they use a basket of physical assets that are Gold, silver, coal,oil, natural gas .... I don’t think they can link the trillions to gold. Microgram coated commemorative coins would be about it for dollars to gold.
The US people via their government owns huge reserves of commodities and licenses for access to commodities including lots of land but our land cannot be converted.
The other thought is to,fix the dollars to be redeemed in explosive force via nuclear weapons, like to see China revive their trillion worth via 45 minute on time delivery
How do you tie the value of the dollar to a basket of commodities whose prices change literally every minute?