Sybil is a real pain, and HashCash (via I2P, which had it as an anti-DoS option) was the first obvious attempt at a solution that worked.  It would be better done with Argon2 now, but it still burns coal and is a bet that evil nodes don&#x27;t have more power than all the good nodes put together - it seems we aren&#x27;t always going to win that bet.<p>Will proof-of-stake would be any better?  It doesn&#x27;t feel as suited to things other than currency to me, because: what value does the deposit have?  We&#x27;ll see how it turns out when deployed, it&#x27;s hard to predict how people will react.<p>There&#x27;s a surprising amount of heat in the field now.  Lots of activity, like this interesting work, some very strong opinions.  Please don&#x27;t eat me!  I&#x27;m quite happy to leave it be and move onto other things.