Ethereum (ETH)

What makes Ethereum different from Bitcoin

Bitcoin is a single-purpose blockchain — a network for transferring BTC. Ethereum is a general-purpose computational platform. Anyone can deploy programs (smart contracts) that run on the network, hold balances, and interact with each other.

This generality has produced almost all of crypto's application-layer activity. DeFi, NFTs, DAOs, stablecoins, oracles, bridges — virtually every meaningful crypto application either runs on Ethereum or runs on a chain inspired by Ethereum's design.

How it works

The Ethereum network is maintained by validators (post-Merge; previously miners) who:

1. Receive transactions from users.
2. Execute the transactions through the EVM, updating the network's shared state.
3. Bundle transactions into blocks and propose them to the network.
4. Reach consensus on which proposed block extends the chain.
5. Earn ETH rewards for honest participation; lose stake (via slashing) for misbehavior.

ETH, the native asset, plays multiple roles: it pays gas fees for transactions, secures the network as staked collateral, and serves as the unit of account for most Ethereum-based DeFi.

The Merge and PoS transition

Ethereum's most significant upgrade was "The Merge" in September 2022, which switched the network from proof-of-work to proof-of-stake. Effects:

• ~99.95% reduction in energy consumption — Ethereum mining consumed energy at the scale of Belgium; PoS reduced it to a small office's load.
• Removed mining rewards — block subsidies dropped sharply; combined with EIP-1559 fee burning, ETH issuance became near-zero or negative depending on network usage.
• Enabled scalability roadmap — many planned upgrades (sharding, account abstraction, others) require PoS as a foundation.

Major upgrades

Notable post-Merge upgrades:

• Shanghai/Capella (April 2023) — enabled withdrawal of staked ETH, completing the staking economic loop.
• Dencun (March 2024) — introduced "blobs" via EIP-4844, dramatically reducing rollup costs and accelerating L2 adoption.
• Pectra (2025) — extended account-abstraction features to existing accounts; multiple smaller protocol improvements.

Future planned upgrades include further scalability work (full danksharding), validator-set improvements, and various features designed to support Layer 2 ecosystems.

Layer 2 strategy

Ethereum's scalability strategy is "rollup-centric" — mainnet stays relatively conservative on throughput, while Layer 2 rollups handle the bulk of user transactions. Major L2s — Arbitrum, Optimism, Base, zkSync, Starknet, and others — collectively process several times Ethereum mainnet's transaction volume at much lower fees.

The trade-off: users have to think about which chain they're on, with assets fragmented across L1 and many L2s. The vision is that abstraction layers will eventually hide this complexity, with users just transacting and the underlying chain becoming an implementation detail.

ETH as an asset

ETH has multiple value drivers that distinguish it from "digital gold" framings of Bitcoin:

• Network usage demand. Every Ethereum transaction burns base fees, removing ETH from supply. Higher network activity = more burn = lower supply growth (sometimes negative).
• Staking demand. Validators must hold ETH; about 25% of total supply is currently staked.
• DeFi collateral demand. ETH is the most-used collateral in DeFi; demand for it scales with DeFi activity.
• Restaking demand. EigenLayer and competing protocols absorb additional ETH for shared security.

Critics call this "ultrasound money" framing optimistic; defenders argue it provides a more compelling fundamental case for ETH than for assets without these mechanics.

ETH ETFs

The launch of US spot Ethereum ETFs in July 2024 brought ETH to traditional brokerage accounts. ETF flows have been smaller than Bitcoin's but meaningful, with combined holdings in the millions of ETH. The ETF approval signals broader institutional acceptance and provides a cleaner path for traditional capital to gain ETH exposure.

Concerns and critiques

A few honest critiques:

• Centralization in staking. Lido and a few other major staking entities control significant fractions of total stake. The Lido concentration concern is recurring.
• Validator centralization. A small number of major operators run a meaningful percentage of validators.
• MEV centralization. MEV extraction has consolidated around a few specialized actors, raising questions about transaction-ordering fairness.
• Roadmap pace. Ethereum's deliberative governance produces slower upgrades than competitors. Critics argue this opens space for faster competing chains; defenders argue it reflects necessary caution.

What Ethereum has actually delivered

After the speculation, durable contributions:

• A platform for smart-contract experimentation that has produced almost every meaningful crypto application.
• The stablecoin ecosystem that moves tens of billions per day in cross-border value.
• DeFi infrastructure — lending, exchanges, yield products — accessible to anyone with a wallet.
• A common standard (ERC-20, ERC-721, EIPs) adopted by most subsequent EVM-compatible chains.
• The most secure smart-contract platform by total value secured — the largest economic stake aligning with honest validation.

The platform has its critics and its competitors, but its position as the dominant smart-contract chain has proven durable through multiple market cycles since 2015.