In the year 2011, Proof-of-Stake (PoS) was proposed in a forum post. Over time, many cryptocurrencies adopted the proof-of-stake system. Many even added their flavor to the underlying PoS to come up with new versions of PoS. In this article, we will discuss PoS and different types of Proof of stake in use. https://coincodecap.com/proof-of-stake-explained