Perhaps the parent wanted to link to Wikipedia (not the Bitcoin Wiki) where the criticism is more concise: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Proof-of-stake" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Proof-of-stake</a><p><i>&quot;One problem is usually called the &quot;nothing at stake&quot; problem, where (in the case of a consensus failure) block-generators have nothing to lose by voting for multiple blockchain-histories, which prevents the consensus from ever resolving&quot;</i>