Rat4

• From Bitcoin.com (11-2019):

"After Peercoin was produced people attempting to harness PoS became very prominent. In early 2014, the anonymous developer called Rat4 designed a ‘PoS version 2,’ which was the first to combine staking with a multi-pool. Rat4 and Blackcoin kicked off the idea and many other PoS coins followed suit. According to the Blackcoin Github repository, Rat4’s Blackcoin codebase has been forked more times than most coins today. After Blackcoin there are now hundreds of PoS coins based on two major types of consensus: BFT PoS and chain-based PoS. The BFT method uses validators that are randomly assigned while chain-based uses an algorithm that pseudo-randomly selects a validator during a pre-selected time slot."