<p>thinking about how all cryptocurrencies trace their lineage to "Hashcash"[1], arguably the first practical proof-of-work system proposed to fight against spam, and now in order to access ham (lore.kernel.org) you have to go through Anubis[2], a client-side proof-of-work system, sort of an inverse Hashcash</p><p>[1]: <a href="https://en.wikipedia.org/wiki/Hashcash" target="_blank" rel="nofollow noopener" translate="no"><span class="invisible">https://</span><span class="">en.wikipedia.org/wiki/Hashcash</span><span class="invisible"></span></a><br />[2]: <a href="https://github.com/TecharoHQ/anubis" target="_blank" rel="nofollow noopener" translate="no"><span class="invisible">https://</span><span class="">github.com/TecharoHQ/anubis</span><span class="invisible"></span></a></p>
