https://vitalik.ca/general/2020/11/06/pos2020.html
https://community.reflexer.finance/t/can-oracles-double-as-co-stakers-how-rai-like-systems-might-safely-support-staked-eth/397
https://vitalik.ca/general/2017/12/17/voting.html
https://vitalik.ca/general/2019/04/03/collusion.html
https://www.radicalxchange.org/media/blog/2018-11-26-4m9b8b/?s=09