[throw10920]

The page says

> Anubis uses a Proof-of-Work scheme in the vein of Hashcash

And if you look up Hashcash on Wikipedia you get https://en.wikipedia.org/wiki/Hashcash which explains how Hashcash works in a fairly straightforward manner (unlike most math pages).

[dheera]

Oh fun so now we're effectively draining users' phone and laptop batteries now just to prove that they have batteries and somehow that's a proxy for them being human

[throw10920]

Given that you're clearly completely ignorant of everything in the anti-spam space, you should probably do some research before making uninformed comments like this.