Ethereum"The Merge" Upgrade Overview
Ethereum On September 15, 2022, the network completed one of the most significant upgrades in its history: “The Merge.” This upgrade marked a complete transition of Ethereum’s consensus mechanism from the traditional “Proof of Work” (PoW) to “Proof of Stake” (PoS).This transition marks a key milestone in the Ethereum roadmap, aimed at addressing long-standing issues related to energy consumption, scalability bottlenecks, and security.
Background and Key Milestones
Ethereum Since its launch in July 2015, the mainnet has operated using a PoW mechanism similar to that of Bitcoin. However, as early as the conception of Ethereum, the community had planned to eventually transition to PoS. To achieve this goal, the Ethereum Foundation and the development team undertook years of preparatory work.
- Launch of the Beacon Chain: On December 1, 2020, the independent PoS blockchain, the “Beacon Chain,” officially launched. It ran in parallel with the PoW mainnet, serving as a testing platform for the PoS mechanism and allowing validators to stake ETH in advance to prepare for the merged PoS network.
- The Merge Completed: On September 15, 2022, Ethereum the PoW execution layer of the mainnet successfully merged with the PoS consensus layer of the Beacon Chain, forming a unified PoS Ethereum network. Former PoW miners no longer participate in block validation.
- Shapella Upgrade: Following The Merge, users could not immediately withdraw their staked ETH or rewards. It wasn’t until April 12, 2023, when Ethereum completed the Shanghai/Capella (Shapella) upgrade, that the withdrawal feature for staked ETH was officially enabled, allowing validators to flexibly manage their staked assets.
Core Objectives and Impact
The core objective of The Merge is to enhance the scalability, security, sustainability, and energy efficiency of the Ethereum network. Its main impacts include:
- Significant Improvement in Energy Efficiency: This is one of the most notable achievements of The Merge. Ethereum’s energy consumption decreased by approximately 99.95% to 99.988% following The Merge, and its carbon footprint was significantly reduced as a result, making it a more environmentally friendly blockchain network.
- Changes in ETH Supply: Under the PoW model, Ethereum issued approximately 13,500 ETH daily. Following the transition to PoS, the ETH issuance rate has decreased significantly and is projected to fall to between 0.3% and 0.4% on an annualized basis. This change may cause ETH to exhibit deflationary characteristics under specific market conditions, similar to the halving effect seen in Bitcoin.
- Impact on Transaction Speed and Fees: It is worth noting that The Merge itself does not directly reduce transaction fees (gas fees) or increase transaction speed. Improvements in these areas will primarily be achieved through future upgrades (such as sharding technology) and existing Layer 2 scaling solutions.
- Staking Ecosystem Development: As of May 2025, over 34 million ETH have been staked to secure the Ethereum PoS network. This staked ETH is provided by numerous validators who collectively maintain the network’s operation.
Perspectives and Controversies
As a disruptive transformation, The Merge has sparked widespread discussion and differing viewpoints:
Supporters’ Perspectives
- Environmentally Friendly: It significantly reduces energy consumption, making Ethereum more aligned with global sustainability trends.
- Enhanced Security: PoS increases the cost and difficulty of a 51% attack through economic incentives and penalty mechanisms (such as “slashing”), thereby strengthening network security.
- Foundation for Scalability: The Merge lays the technical groundwork for future scalability upgrades, such as sharding, which are expected to significantly boost Ethereum’s processing capacity in the future.
- Potential for Decentralization: Theoretically, PoS lowers the barrier to entry (no need for expensive mining equipment), which can attract more nodes to participate in network validation, thereby promoting decentralization.
Critics’ Perspectives
- Risk of Centralization: Some worry that the PoS system may lead to a concentration of power in the hands of a few staking entities holding large amounts of ETH (such as large staking service providers and exchanges), which may run counter to the decentralized spirit of blockchain.
- Censorship Risk: Large validators may be forced to censor transactions due to regulatory pressure, thereby threatening the neutrality and censorship resistance of Ethereum.
- New Attack Vectors: Critics argue that attackers need only accumulate 51% of the staked ETH to launch an attack, which may be easier to achieve than a 51% attack in PoW.
ETH Price Performance and Trading Channels
On the day The Merge was completed—September 15, 2022—the price of ETH was approximately $1,640, but it fell to about $1,450 within 24 hours.In the months that followed, influenced by market factors such as a macroeconomic downturn and the FTX collapse, the ETH price came under pressure at times and did not begin to recover until February 2023. It is important to note that cryptocurrency prices are influenced by a variety of factors and are highly volatile.
Currently, ETH can be traded on numerous cryptocurrency exchanges, including BTCC, BVOX, Pionex, Binance, Tapbit, Biconomy.com, Hotcoin, CoinW, KCEX, Poloniex, WEEX, OrangeX, DigiFinex, FameEX, and Coinbase International Exchange, among others.
