http://ttevhjjsjxz6uqqcjkbig5cycd7n7xv7cmd6f5fcvrqaaa7f3bj36wad.onion/technology/security/pow/index.html
It features lightning fast
verification speed, and also aims to minimize the asymmetry between CPU and
GPU. Furthermore, it's designed for this particular use-case and hence
cryptocurrency miners are not incentivized to make optimized ASICs for it.