Ethereum 2.0, also known as Eth2 or “Serenity,” is an upgrade to the Ethereum blockchain. The upgrade aims to enhance the speed, efficiency, and scalability of the Ethereum network so that it can avoid bottlenecks and process more transactions simultaneously. But Ethereum 2.0 also doesn't really exist—in January 2022, the Ethereum Foundation said it would stop referring to the upgrade as Ethereum 2.0. The rebrand is intended to reflect the fact that what's happening is a network upg...