Essentially, the progress of human material life is the continuous improvement of energy acquisition and conversion efficiency. So the ideal currency history has gone from the gold standard (Bretton Woods) to fiat currencies anchored in energy trade (US dollars), and now to digital forms (digital currencies). The next stage is digital currencies anchored in energy, perhaps more sustainable - binding "verifiable physical scarcity of the most important strategic resources" and "programmable settlements" together. https://mp.weixin. (qq.com)/s/Ssw5Ay1JRq7-asLq-atFlg