We need altcoins as long as we interact economically over the net, with people we do not know (or simply with people outside our local communities). If we try to imagine what qualities a “solarpunk coin” should have, what are your thoughts? Do we know any existing coin, checking all boxes? This question is more about political economy of Solarpunk, then its technology.
Curecoin rewards completing unfolding proteins with Folding@home with your GPU as a form of distributed medical research, so none of the energy is technically wasted.