The transition from Proof-of-Work (PoW) to Proof-of-Stake (PoS) is the most important and complex upgrade in Ethereum's history. The process, which has been ongoing for seven years, has reached the finish line.
Today, September 15, 2022, the core network of Ethereum, the second largest cryptocurrency by capitalization, officially switched to the Proof-of-Stake algorithm.
The activation took place on block #15537394.
This is what the first block on the PoS looks like: