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Ethereum’s move to PoS is trading off decentralization for scalability


With the Merge finally completed, Ethereum is now running as a Proof-of-Stake (PoS) network.

However, its transition from a Proof-of-Work (PoW) system has been highly controversial. Supporters of PoW mining feared that staking would centralize the network and threaten its independence. Those fighting for a PoS network touted the scalability and precision that would arise from the new system.

On-chain analysis provides us with a clear view of all the pros and cons of the Merge. Looking at the Ethereum blockchain shows when the transition from PoW to PoS occurred, with ETH mining difficulty and hash rate dropping to zero.

ethereum hash rate difficulty
Graph showing the Ethereum hash rate and mining difficulty in 2022 (Source: Glassnode)

The centralization issues PoS opponents warned about are evident on-chain.

The total amount of ETH transferred to the ETH2 deposit contract via staking providers currently stands at around 13.8 million ETH. Around 70% of that amount, or around 10 million ETH, is concentrated with just four staking service providers—Lido, Coinbase, Kraken, and Binance.

ethereum total value staked provider
Graph showing the total value of staked ETH by provider (Source: Glassnode)

However, the number of active validators on the network has reached its all-time high. A higher number of independent validators drastically increases the decentralization of the network and offers a more positive alternative to the centralization seen among staking providers.

Active validators are defined as validators that have completed activation, aren’t lined in an exit queue, and have effective balances greater than 32 ETH. There are currently over 430,000 active validators, with the number increasing significantly since the Merge was announced in January 2021.

ethereum active validators
Graph showing the number of active validators on Ethereum from January 2021 to September 2022 (Source: Glassnode)

Another tangible benefit PoS brought to Ethereum is scalability.

The newly implemented deterministic block times brought a 15% increase in block space per day. The transition from PoW to PoS reduced block times from 13.5 seconds to 12 seconds, creating a precision staking consensus. Immediately following the Merge, the block interval median time and the mean programmed time dropped to 12 seconds.

ethereum mean median block time
Graph showing the mean and median block times on Ethereum from October 2021 to September 2022 (Source: Glassnode)
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