You know what would make the perfect currency? Weed. Cannabis. Herb. Gandja. Why?
"And I will raise up for them a plant of renown, and they shall be no more consumed with hunger in the land, neither bear the shame of the heathen any more."
Cannabis fights cancer, it nourishes the body, it makes valuable and long lasting products of virtually any kind, planting it purifies the soil, you can live on the seed alone for all of your body's nourishment, people enjoy its use, it retains a high market value (for thousands of years and despite prohibition), it grows almost anywhere, and no one person, organization or institution can solely control the flow of it; they have tried.
If we are to look for a real solution to our currency problem why should we not use a medium that empowers us rather than enslaving us?