ETH 2.0 is Already a Form of Rollup

As we transition to a new scaling paradigm, it is good practice to review the old paradigms being abandoned. This article aims to convince readers that the "rollup-centric" approach does not deviate from sharding, and promises to build a more intuitive understanding of the entire (hypothetical) system. Definition of Optimistic Rollup. For the purposes of this article, we first detail the simplest Optimistic Rollup (ORU) implementation.