What is Ethereum (ETH)? A Complete 2026 Guide

What is Ethereum? Ethereum is a decentralized smart-contract platform whose native asset, Ether (ETH), is the second-largest cryptocurrency by market value after Bitcoin. Launched in 2015, it is programmable money: instead of just transferring value, anyone can deploy code (smart contracts) that runs across the network and settles automatically. In 2026, roughly 120.7 million ETH are in circulation, about 30% of supply is staked by more than 890,000 active validators (about 1.1 million total beacon-chain slots when queued and exited are counted), and US spot Ether ETFs hold around $14.8 billion in regulated exposure.

This guide answers the questions a 2026 buyer actually has about what is Ethereum as a working platform: how the network operates after the 2022 Merge and 2025 Pectra upgrade, what Ether actually does, how staking and restaking generate yield, how to buy and store ETH, and what risks are real versus marketed. Every figure is sourced to a primary citation in the footer.

How does Ethereum work?

Ethereum runs as a single virtual computer replicated across thousands of independent nodes. The reference implementation is documented at ethereum.org and the formal specification lives in the Ethereum Yellow Paper. Anyone can run a node by downloading the client software (Geth, Nethermind, Besu, Reth, Erigon for execution; Prysm, Lighthouse, Teku, Nimbus, Lodestar for consensus). Every node holds the same state, and every state change has to be verified against the same rules.

The unit of state change is a transaction. Transactions are batched into blocks, each block links to the previous one via a cryptographic hash, and blocks are produced on a strict 12-second schedule. The chain that has the most attestations from honest validators is the canonical one. This is proof-of-stake consensus, and it replaced the original proof-of-work mining model in September 2022 during an event the community calls "the Merge."

What are validators and why did they replace miners?

Before the Merge, security came from miners burning electricity to find valid hashes (proof-of-work). Since 15 September 2022, security comes from validators locking up Ether as a financial bond (proof-of-stake). To run a validator, an operator deposits 32 ETH as the minimum stake and runs both an execution client and a consensus client. If the validator behaves honestly, it earns rewards; if it equivocates or goes offline, a portion of its stake is slashed.

The Ethereum Foundation estimated the switch reduced the network's energy consumption by approximately 99.95%. As of May 2026, more than 890,000 active validators (about 1.1 million total beacon-chain slots including queued and exited entries) hold around 35.86 million ETH, equal to roughly 30% of the total supply.

What is gas and why do fees fluctuate?

Every operation on the network costs gas, which is paid in Ether. A simple transfer costs 21,000 units of gas; a complex smart-contract interaction can cost millions. Users set a gas price in gwei (one billionth of an ETH), and validators prioritize transactions with the highest tips. Since the EIP-1559 upgrade in August 2021, every transaction also burns a base fee that scales with network congestion. When demand is high, the base fee rises and burning accelerates; when demand falls, fees drop and burning slows. This burn mechanism is the reason Ether's net supply has been flat or slightly deflationary since the Merge.

Skrumble tracks ETH gas fees live through a cross-source aggregator that reconciles values from Coinbase public market data, Binance public market data, CoinGecko, and on-chain mempool snapshots. The LiveFeeWidget on the homepage publishes the median in near-real time, with a fresh-ping indicator when the value was computed within the last 60 seconds. We use the same aggregator output in this guide, which is why the fee numbers above match what you see on the live widget at any given moment.

Who created Ethereum and when did it launch?

The concept was published by Vitalik Buterin in a whitepaper circulated in late 2013, and Buterin presented it publicly at the North American Bitcoin Conference in Miami on 26 January 2014. The founding team that built the initial network included Buterin, Anthony Di Iorio, Charles Hoskinson, Mihai Alisie, and Amir Chetrit, with Joseph Lubin, Gavin Wood, and Jeffrey Wilcke joining in early 2014. Wood authored the Yellow Paper and the Solidity programming language; Lubin went on to found ConsenSys; Hoskinson later founded Cardano.

A 2014 token sale raised about 31,000 BTC (then worth roughly $18 million) to fund development. The mainnet went live on 30 July 2015, originally as a proof-of-work chain. The non-profit Ethereum Foundation in Switzerland continues to coordinate development through Improvement Proposals at eips.ethereum.org, with changes ratified by rough consensus among researchers, client teams, validators, and exchanges.

What can you do on Ethereum that you cannot do on Bitcoin?

The defining difference is programmability. Bitcoin's script language is intentionally limited to a few financial primitives; Ethereum's is Turing-complete, meaning a developer can encode arbitrarily complex logic and have it run deterministically across every node. That single design choice opens four categories of application that Bitcoin's base layer cannot host directly:

None of these required custom blockchains. They all run as smart contracts on Ethereum (or on Ethereum-compatible Layer 2 networks like Arbitrum, Optimism, and Base, which inherit Ethereum's security while processing transactions more cheaply).

What are smart contracts?

A smart contract is a small program that lives at a specific address on the chain. It has its own balance, its own storage, and a public interface that anyone can call. The code executes automatically when a transaction triggers one of its functions, and the result is recorded on every node. There is no human in the loop, and once deployed the code generally cannot be changed (unless the contract was built with an explicit upgrade mechanism).

Contracts are typically written in Solidity or Vyper, compiled to bytecode, and run inside the Ethereum Virtual Machine (EVM). Because every node executes the same bytecode against the same state, every node arrives at the same result. That deterministic shared computation is what people mean when they call Ethereum a "world computer." Concrete examples: when you swap tokens on Uniswap, a contract is computing the price and moving the assets; when you deposit USDC into Aave, a contract is recording your collateral and your borrow limit; when you mint an NFT, a contract is issuing a token and assigning it to your address.

What is Ether (ETH) and how is it different from Ethereum?

Ethereum is the network. Ether (ticker symbol ETH) is the asset that pays for using it. The two are often used interchangeably, but the distinction matters in practice: when an exchange or ETF says it holds Ethereum, it almost always means it holds ETH, the unit of value, not the network itself (which nobody owns).

ETH has three functions:

• Gas. Every transaction, deployment, and contract call requires ETH to pay for computation and storage.
• Staking collateral. Validators lock up ETH to earn the right to propose and attest to blocks; misbehavior gets slashed.
• Programmable money. Smart contracts use ETH as the native unit for collateral, settlement, and rewards. Stablecoins, NFTs, and DeFi all depend on it for gas, even when the user is transacting in another token.

Unlike Bitcoin, Ether has no fixed supply cap. Issuance was originally inflationary; since the Merge and EIP-1559 burn mechanism, net supply growth has been close to zero and frequently negative during periods of high network activity. The current issuance schedule is published live at ultrasound.money.

How has Ethereum changed since the Merge?

The Merge (September 2022) was only the start of a multi-year upgrade roadmap. Three subsequent upgrades have materially reshaped the network:

The roadmap published at ethereum.org/roadmap lays out three remaining work streams: full danksharding (additional blob throughput), the Verge (stateless clients via Verkle trees), and the Purge (state expiry to limit historical bloat).

What was the Pectra upgrade?

Pectra activated on the mainnet on 7 May 2025 at epoch 364032 and is the largest single upgrade since the Merge. It bundled 11 Ethereum Improvement Proposals across the consensus layer (Electra) and execution layer (Prague). The three most consequential changes:

• EIP-7251: validator stake ceiling raised from 32 to 2,048 ETH. Large operators can now consolidate up to 64 separate 32-ETH validators into one. This reduces consensus-layer overhead, simplifies institutional staking, and lays the foundation for the staked-ETH ETF products BlackRock filed for in December 2025.
• EIP-7702: account abstraction for regular wallets. Externally owned accounts can temporarily execute smart-contract logic, which means a standard MetaMask wallet can batch transactions, pay gas in stablecoins, or use social recovery without migrating to a smart-contract wallet. The user experience improvement is significant.
• EIP-7691: doubled blob throughput for Layer 2s. Average rollup fees on Base, Arbitrum, and Optimism dropped 40-60% within weeks of activation, per the Ethereum Foundation announcement.

The next upgrade, code-named Fusaka, is scheduled for the second half of 2026 and will continue the blob-capacity expansion alongside execution-layer improvements.

What is restaking and EigenLayer?

Restaking is the practice of using already-staked ETH to secure additional services beyond the base chain. The dominant protocol is EigenLayer, which lets validators opt in to extending their slashing conditions to cover external Actively Validated Services (AVSs): data-availability layers, oracle networks, bridges, and AI verification systems. In exchange, the validator earns additional fees from those services.

The economic argument is that Ethereum's pooled security ($15.26 billion in EigenLayer alone, with around 93.9% market share of the restaking sector as of early 2026) can be rented out to applications that would otherwise have to bootstrap their own validator sets. The risk is correlated slashing: if many AVSs use the same restakers and one fails, the cascade can wipe out a large fraction of pooled stake at once. The trade-off is still being priced by the market, and the policy debate around restaking is one of the active research questions inside the Foundation.

How do I buy and store Ether?

There are three practical paths for retail buyers, ordered by simplicity:

Buy through a regulated crypto exchange

The most direct path is a centralized exchange that supports fiat deposits. Coinbase, Binance, and Kraken all support buying ETH with bank transfer, card, or stablecoin. Fees range from 0.10% to 1.5% depending on volume tier and payment method. Compare options in our exchange comparison tool. As with Bitcoin, balances left on the exchange remain custodial; withdrawing to your own wallet is what makes the asset yours.

Buy a spot Ether ETF in a brokerage account

The SEC approved eight spot Ether ETFs on 23 May 2024, with trading beginning on 23 July 2024. The funds, led by BlackRock's iShares Ethereum Trust (ETHA) and Fidelity's FETH, held a combined $14.8 billion in assets as of May 2026, after peaking near $19.6 billion in December 2025. Expense ratios range from 0.19% to 0.25% at the leaders. ETF buyers get price exposure inside ordinary brokerage, IRA, and 401(k) accounts but never hold the underlying ETH themselves. BlackRock filed for a staked-ETH variant in December 2025 that would also distribute staking yield; SEC approval is pending.

Store in a self-custody wallet

For amounts you do not plan to actively trade, withdraw to a self-custody wallet. Software wallets (MetaMask, Rabby, Frame) are free and convenient for small balances. Hardware wallets (Ledger, Trezor, Coldcard, Keystone) keep the private keys offline and are the recommended default for holdings above $1,000. Smart-contract wallets (Safe, Argent, Coinbase Smart Wallet) add features like social recovery and multisignature spending at the cost of higher per-transaction gas. Whichever you pick, the seed phrase backup is the entire security model; never type it into a phone, photograph it, or store it in cloud storage.

Can I earn yield by staking ETH?

Yes. Validator rewards run roughly 3% to 5% annualized in May 2026, depending on the staking method. Three options, ordered by yield:

• Solo staking. Run your own validator with at least 32 ETH (or, after Pectra, consolidate up to 2,048 ETH on one validator). Yields are highest (4% to 5% APY including MEV rewards via MEV-Boost) because you pay no operator fees, but the operational burden is real: hardware, uptime requirements, and slashing risk.
• Liquid staking. Deposit any amount of ETH into a pool like Lido (stETH), Rocket Pool (rETH), or Coinbase (cbETH), and receive a tradable token that accrues staking rewards. Typical net APY is 3.5% to 4% after protocol fees. The trade-off is smart-contract risk and concentration risk: Lido alone secured roughly a quarter of all staked ETH at one point.
• Exchange staking. Coinbase, Kraken, and Binance offer one-click staking. APY is typically 3% to 3.5% after fees. The product is custodial; the exchange holds the keys.

Restaking through EigenLayer adds another 1% to 4% on top of base staking rewards but introduces correlated slashing risk across the AVSs you opt into. Treat restaking yield as risk-bearing, not free.

Is Ethereum legal and how is it taxed?

Ether is legal to own and trade in the United States, the European Union, the United Kingdom, Canada, Australia, Singapore, Japan, Brazil, and most major jurisdictions. The IRS treats ETH as property under Notice 2014-21: every sale, swap, or spend is a capital-gain or capital-loss event. Staking and restaking rewards are taxed as ordinary income at the fair market value on the day they are received, and a second capital-gain event is triggered when they are later sold. Beginning January 2025, US digital-asset brokers report customers' gross proceeds on Form 1099-DA, with cost-basis reporting phasing in for the 2026 tax year.

Other jurisdictions follow broadly similar approaches with notable variations: Singapore has no capital-gains tax on personal crypto disposals (see our Singapore crypto tax guide); Portugal taxes short-term gains at 28% but exempts holdings over one year; Germany exempts disposals after a 12-month holding period for self-custodied assets.

What are the real risks of holding Ether?

The risk profile in 2026 is different from a decade ago but not zero:

• Price volatility. Drawdowns of 60% or more have happened in every multi-year cycle. Size positions accordingly.
• Smart-contract risk. Anything beyond holding ETH in self-custody (DeFi, restaking, liquid staking) introduces code that could be exploited or governance that could be captured. Audited code is not bug-free code.
• Liquid-staking concentration. Lido alone has secured roughly 25 to 30 percent of all staked ETH at times, a single-protocol concentration distinct from the broader smart-contract risk above. If Lido's validator set were to misbehave or its governance were captured, the impact would ripple across every protocol that accepts stETH as collateral.
• Slashing. Validators (including pooled liquid-staking validators) can lose stake for downtime or equivocation. Liquid-staking token holders are exposed to that loss pro rata.
• Centralization concerns. A small number of liquid-staking protocols, MEV-builders, and Layer 2 sequencers control disproportionate shares of network activity. The Foundation is actively addressing these via proposer-builder separation and decentralization roadmap items, but the work is ongoing.
• Regulatory drift. The 2024 spot ETF approval and pending staked-ETF decision are tailwinds, but stablecoin regulation, DeFi enforcement, and the SEC's evolving stance on staking-as-service continue to shape the asset's institutional access in every major market.

None of these are reasons to avoid Ether entirely. They are reasons to size positions responsibly, prefer self-custody to exchange custody for long-term holdings, and treat yield-bearing products as risk-bearing rather than savings accounts.