<s>[INST] Tell me about Ethereum 2.0 [/INST] Ethereum 2.0, also known as Eth2 or Serenity, is an upgrade to the Ethereum blockchain. It aims to transition Ethereum from a proof-of-work (PoW) to a proof-of-stake (PoS) consensus mechanism, improving scalability and energy efficiency. Eth2 will introduce features like shard chains and increase the network's capacity. </s>