3sf-mini: a basic implementation and simulation of 3-slot finality

(many details of 3sf are of course still in flux; the goal is to create a minimal software package that makes it easy to understand 3sf and play around with options)

https://github.com/ethereum/research/tree/master/3sf-mini

The 3-Slot Finality (3SF) protocol, designed to enhance blockchain consensus mechanisms like Ethereum’s, achieves block finalization within three slots, significantly reducing the 64–95 slots required by Ethereum’s Gasper protocol.