Ethereum

What is Ethereum?

Ethereum is a decentralized blockchain that runs programs called smart contracts. Where Bitcoin was designed mainly to move money, Ethereum was built to be a general-purpose computer that thousands of computers around the world run and agree on. ETH is the network's native token: it pays transaction fees ('gas') and secures the network through staking.

It was proposed in a 2013 whitepaper by Vitalik Buterin, then 19, who thought Bitcoin's scripting was too limited. He was joined by seven other co-founders (eight in total), including Gavin Wood (who wrote the technical 'Yellow Paper' and coined the Ethereum Virtual Machine) and Joseph Lubin. The network was funded by a public 2014 crowdsale that raised about 31,000 BTC (~$18M at the time) and went live on July 30, 2015.

The point of Ethereum is 'do this and no one can stop it or change the rules.' A contract deployed to Ethereum runs as written, without a company or bank in the middle. That property is what made it the foundation for DeFi (decentralized finance), NFTs, stablecoins, and most of the tokens you see today.

Development is guided by the non-profit Ethereum Foundation, but no single entity controls the network. Anyone can run software, propose changes, or build on it — upgrades happen only when the wider community of clients and validators adopts them.

How it works

Ethereum reaches agreement using proof-of-stake (PoS). Instead of miners burning electricity, 'validators' lock up ETH as collateral for the right to propose and check blocks. To run your own validator you deposit 32 ETH; if you cheat or go badly offline, part of that stake can be 'slashed' (destroyed). This ties the network's security directly to money at risk.

Time is chopped into 12-second 'slots' and 32-slot 'epochs.' In each slot one validator is randomly chosen to propose a block, and committees of other validators vote ('attest') on whether it's valid. Once enough of the total staked ETH backs a block, it becomes 'finalized' — reversing it would require an attacker to control and lose a huge fraction of all staked ETH, which is economically brutal.

Smart contracts execute on the Ethereum Virtual Machine (EVM), a shared computer every node runs. Every operation costs 'gas,' paid in ETH, which stops infinite loops and spam. Since 2022's Merge, Ethereum's strategy has been to keep the base layer (L1) secure and lean while pushing most user activity onto faster, cheaper Layer-2 rollups that post their data back to L1.

• Consensus: proof-of-stake — validators stake 32 ETH each; roughly 35M ETH (around 30% of supply) is staked across 1M+ validators as of 2026.
• Gas fees: every transaction and contract call is paid in ETH; a portion of each fee is burned (EIP-1559, live since Aug 2021).
• The Merge (Sept 2022) switched Ethereum from energy-hungry proof-of-work to PoS, cutting its energy use by ~99.95%.
• Rollups (Layer-2s) do the heavy lifting cheaply and settle to Ethereum for security — the 'modular' scaling approach.
• You don't need 32 ETH to participate: staking pools and liquid-staking tokens let smaller holders stake, at the cost of added trust in a provider.

What they're building

Ethereum's 2026 direction is 'scale the base layer and make it easier to build on, without giving up decentralization.' The Pectra upgrade (May 2025) added account-abstraction stepping stones (EIP-7702, letting normal wallets temporarily act like smart contracts) and raised validator efficiency. Fusaka went live on mainnet on December 3, 2025, shipping PeerDAS — data-availability sampling that lets nodes verify rollup data without downloading all of it — plus staged blob-limit increases that sharply raised the data throughput available to L2s.

The next major upgrade, nicknamed Glamsterdam, is expected in the second half of 2026 (developers are targeting Q3 after an earlier H1 goal slipped). Its headline items are Block-Level Access Lists (EIP-7928) and enshrined proposer-builder separation (EIP-7732), which together make it safe to raise the block gas limit meaningfully — discussion targets moving from the ~60M range toward a ~200M design ceiling (validators still set the actual limit by vote), meaning more transactions per block. Longer-horizon work being scoped includes native account abstraction and post-quantum cryptography research.

The broader thesis: Ethereum L1 becomes the settlement and data-availability layer that secures a growing stack of rollups and tokenized assets, while everyday transactions happen on cheap L2s. Whether that keeps enough economic value flowing to ETH holders — rather than leaking it to the L2s — is one of the live debates the roadmap is trying to answer.

• Fusaka (live Dec 3, 2025): PeerDAS + higher blob limits — more data bandwidth for Layer-2 rollups.
• Pectra (May 2025): EIP-7702 account-abstraction bridge, larger max validator balance, smoother staking.
• Glamsterdam (expected H2 2026, Q3 target): enshrined proposer-builder separation + block-level access lists, enabling a large gas-limit increase.
• Ongoing: pushing rollup-centric scaling (the 'surge'), improving validator/staking UX, and researching post-quantum cryptography.
• Direction: keep L1 lean and secure as a settlement layer; move user activity to L2s where fees are often under a cent.

Quick facts

The ecosystem

• DeFi: Uniswap, Aave, MakerDAO/Sky, Curve and others — Ethereum pioneered decentralized lending, trading, and stablecoins
• Stablecoins: the largest home for USDC and USDT, with well over $150B in stablecoin value on Ethereum rails as of 2026
• Layer-2 rollups: Base (Coinbase), Arbitrum, Optimism, zkSync — Base and Arbitrum alone hold the majority of L2 DeFi value
• NFTs & tokenization: the original NFT chain; now a hub for tokenized real-world assets and treasury pilots from firms like BlackRock and JPMorgan
• Infrastructure & standards: the ERC-20 (tokens) and ERC-721 (NFTs) standards that most of crypto now uses originated on Ethereum
• Institutional access: US spot ETH ETFs give traditional investors regulated exposure without self-custody

History

• 2013Vitalik Buterin, 19, publishes the Ethereum whitepaper proposing a programmable blockchain.
• 2014Public crowdsale raises ~31,000 BTC (~$18M); Gavin Wood publishes the Yellow Paper defining the EVM.
• 2015Ethereum mainnet goes live (Frontier); the Genesis block is mined on July 30.
• 2016The DAO hack drains ~$60M; a contentious hard fork reverses it and splits off Ethereum Classic.
• 2020Beacon Chain launches, starting proof-of-stake in parallel with the DeFi 'summer' boom.
• 2021EIP-1559 introduces the fee-burn mechanism, changing ETH's supply economics.
• 2022The Merge switches Ethereum to full proof-of-stake, cutting energy use ~99.95%.
• 2024Dencun upgrade adds 'blobs' (EIP-4844), slashing Layer-2 transaction costs to fractions of a cent.
• 2025Pectra (May) and Fusaka (Dec 3) upgrades ship — account-abstraction bridges and PeerDAS data scaling.
• 2026Glamsterdam upgrade expected (H2, Q3 target), targeting enshrined PBS and a large gas-limit increase.

How to invest (safely)

• Educational, not financial advice. Nothing here is a recommendation to buy — only ever risk money you can afford to lose entirely.
• Learn before you buy: understand that ETH is volatile and that you are responsible for your own keys. If you don't understand a product (leverage, staking derivatives, random tokens), don't put money in it.
• Buy from a reputable, regulated exchange in your country. Verify the ticker is ETH and the network is Ethereum, and start with a small amount to learn the mechanics.
• Move meaningful holdings to self-custody. 'Not your keys, not your coins' — a self-custody wallet (software like MetaMask/Rabby, or hardware like Ledger/Trezor for larger sums) means no exchange failure can freeze your funds.
• Write down your seed phrase on paper and store it offline. Never type it into a website or share it — anyone with the phrase owns your ETH, and there is no password reset.
• Keep a little ETH for gas. Every transaction (sending, staking, using an app) costs ETH; on Layer-2s this is often a fraction of a cent.
• Consider dollar-cost averaging instead of timing the market, and be honest that even 'blue-chip' crypto can drop sharply.
• If you want yield from staking, understand the trade-offs: solo staking needs 32 ETH and uptime; pools and liquid-staking tokens are easier but add smart-contract and provider risk. Higher advertised yields usually mean higher hidden risk.
• Watch for scams: fake 'ETH giveaways,' impersonator support, and wallet-draining sites are everywhere. Ethereum has no official support that will DM you.