Original concept:
"PetroDollar is a peer-to-peer digital currency designed to deflate with relation to the world crude oils reserves. PetroDollar has a approximate 1:10,000 relationship to barrels of oil still existing in the ground, thus creating an analogy of the USD/OIL trading pair. Every transaction(Tx) broadcast over the PetroDollar network will be charged a transaction fee to be destroyed in line with oil depletion. Transaction fees are destroyed autonomously, at an organic rate based on a mathematical model of the oil market. PetroDollar has a current fee of 1.429% of the amount transmitted, increasing to approximately 15% in year 2045."
https://web.archive.org/web/20140806114159/http://petrodollar.org/index.htmlhttps://web.archive.org/web/20140806114159/http://petrodollar.org/concept.html