In 2022, Ethereum renamed its transition from proof-of-work to proof-of-stake from Ethereum 2.0 to The Merge. The Merge went live on Sept. 15, 2022, after the merge of the Goerli testnet successfully completed on Aug. 11, 2022.
Read: All you ever wanted to learn about the Ethereum Merge.
The Merge implements several critical changes to Ethereum. First, it merges the existing PoW Ethereum mainnet with the Beacon Chain, a PoS chain. Together, the two chains will form the new proof-of-stake Ethereum, which will consist of a consensus layer and an execution layer. The consensus layer will synchronize the chain state across the network, while the execution layer handles transactions and block production.
Second, the Merge significantly reduces ETH issuance. This has been dubbed the “triple halving” in a nod to the Bitcoin halving, since the Merge reduces ETH issuance by 90%. With more than 14M ETH already staked, ETH could very well become deflationary after the transition. Furthermore, stakers are expected to earn between 8% and 12% APR at current projections. Staked ETH will not be withdrawable immediately after the Merge — it will only be enabled after the Shanghai upgrade, estimated to be 6 to 12 months later.
Learn more about the common misconceptions of Ethereum post-Merge.
The Merge will not increase transaction throughput or reduce gas fees, as the block production rate stays roughly the same at 12 seconds (currently 13 seconds). It will also not enable on-chain governance, with protocol changes still discussed and decided off-chain through stakeholders.
Importantly, the transition to PoS is expected to reduce Ethereum’s annual energy consumption from 112 TWh/yr to only 0.01 TWh/yr — a 99.9% drop. This reduction prompted investors to expect an influx of institutional money in a “greener” Ethereum. On the flip side, Ethereum miners, in an industry estimated to be worth $19 billion, seek to champion ETHPoW, a potential hard fork of Ethereum on proof-of-work. We explain the main differences in our ETH PoS vs ETH PoW article.
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