Ethereum Mainnet uses proof-of-stake, but this wasn't always the case.The upgrade from the original proof-of-work mechanism to proof-of-stake was called The Merge.The Merge refers to the original Ethereum Mainnet merging with a separate proof-of-stake blockchain called the Beacon Chain, now existing as one chain.The Merge reduced Ethereum's energy consumption by ~99.95%. On this pageWhat was The M