"The Merge" referred to a shift from Ethereum's proof-of-work (PoW) consensus mechanism to a proof-of-stake (PoS) validation system. Ethereum's core developers have pushed for this transition for many years in the hopes that a PoS model will make it easier to scale without sacrificing decentralization. Ethereum developers have also been vocal about PoS mitigating environmental impact.
Initially, Ethereum relied on crypto miners who would supply computing power to verify transactions. This initial PoW model was based on Bitcoin's consensus algorithm. Like Bitcoin, Ethereum miners used their computers to compete against each other to validate new blocks and collect crypto rewards.
In contrast, PoS requires a blockchain's validators to lock their cryptocurrency on-chain to earn a percentage of fees. A PoS algorithm selects who gets to validate each block and distributes rewards proportional to their stake. The more a person stakes, the greater chance they’ll validate more blocks.
Developers used the phrase "Merge" to describe the moment when the PoW chain fuses with the new PoS Beacon Chain. During the Merge, all the transaction data and dApps (decentralized applications) on the PoW Ethereum migrated to the new PoS chain. The Ethereum Foundation likened the Merge to swapping out a rocket ship’s old engine with a new one mid-flight.
The Ethereum Beacon Chain is the PoS chain that the original PoW chain "merged" into. Created at the end of 2020, Ethereum's Beacon Chain ran alongside the PoW chain, mirroring its transactions as developers got ready for the Merge.
When the Beacon Chain went live, the Ethereum Foundation allowed people to stake their ETH on the new blockchain to secure the network. Ethereum validators need to stake a minimum of 32 ETH, and they can’t withdraw their ETH until a future post-Merge upgrade called "Shanghai."
A major reason for releasing the Beacon Chain ahead of the Merge was to build a large validator pool. Before the Merge, Ethereum had roughly 430,000 validators on the Beacon Chain.
Proponents of the Merge believe the Ethereum 2.0 upgrade is the first step in addressing the chain's scalability issues. While switching to PoS won't eliminate high gas fees or slow transaction speeds, it sets the stage for new solutions like "sharding."
The proof-of-stake consensus mechanism will help developers create parallel chains known as "shards" that can store pieces of transactional data from the main Ethereum chain. The hope is that this sharding technology will ramp up Ethereum's transactional throughput and reduce network fees.
Another reason Ethereum switched to PoS was to reduce its energy consumption. Environmentalists have long criticized PoW chains for their power use and CO2 emissions. After the Merge, Ethereum reduced its energy and pollution scores by about 99.95%.
After years of delays, the Ethereum Merge went live on September 15, 2022, at 6:43 AM UTC. Most centralized crypto exchanges (CEXs) paused Ethereum withdrawals during this time. However, since the Ethereum Merge was successful, trading activity has resumed as usual.
As news of the Merge began spreading on social media, it picked up many misconceptions. Here’s what many people think about the Ethereum Merge:
Although many are optimistic about the Merge, some have critiqued Ethereum's move to PoS. Most notably, critics argue that Ethereum 2.0 will have a greater risk of centralization due to staking pool providers.
Platforms like Lido Finance and CEXs like Coinbase offer Ethereum staking pool services. These sites allow people to deposit less than 32 ETH and receive token rewards. Some worry that these large staking pools can use their voting power to dictate the future direction of the Ethereum blockchain.
There are also fears that the U.S. Securities and Exchange Commission (SEC) will deem ETH a security token. If this is the case, Ethereum will have to comply with SEC regulations.
The Merge is the first update in a five-step plan to build a more scalable Ethereum. The following stages are as follows:
The Ethereum proof-of-stake chain is live, but there are still many questions about what this change means for crypto. Supporters believe Ethereum 2.0 will make Web3 more accessible to users. However, some are worried about the influence large staking pools might have over blockchain governance.
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