In the first paragraph, this is cited: <a href="https:&#x2F;&#x2F;download.wpsoftware.net&#x2F;bitcoin&#x2F;pos.pdf" rel="nofollow">https:&#x2F;&#x2F;download.wpsoftware.net&#x2F;bitcoin&#x2F;pos.pdf</a><p>It is a good, generalized overview of the faults in proof-of-stake consensus systems.