Ethereum (ETH)

Ethereum is a decentralized, open-source blockchain platform that supports smart contracts — self-executing programs that run exactly as written without a central intermediary. Proposed in a 2013 white paper by programmer Vitalik Buterin and launched on July 30, 2015, Ethereum extended the blockchain concept pioneered by Bitcoin from a system for transferring digital money into a general-purpose, programmable computing platform.¹² Its native cryptocurrency, ether (ticker: ETH), is used to pay for transactions and computation on the network and is, by market capitalization, the second-largest cryptocurrency after Bitcoin.¹ As of July 2026, ETH traded in the range of roughly $1,700–$1,800, with a market capitalization of approximately $210–233 billion, down substantially from an all-time high near $4,946 reached in August 2025.³⁴

Overview

Ticker	ETH
Category	Smart Contract Platform
Website	https://www.ethereum.org/
Twitter	@ethereum
Reddit	https://www.reddit.com/r/ethereum

Unlike Bitcoin's scripting language, which is deliberately limited, Ethereum runs a general-purpose virtual machine — the Ethereum Virtual Machine (EVM) — capable of executing arbitrarily complex programs called smart contracts.¹ This capability enabled entirely new categories of decentralized applications, including decentralized finance (DeFi) protocols for lending and trading, non-fungible tokens (NFTs), decentralized autonomous organizations (DAOs), and stablecoins, most of which are issued using open token standards such as ERC-20 (fungible tokens) and ERC-721 (non-fungible tokens) that were first defined for use on Ethereum.¹

Ethereum's development is not controlled by any single company. Instead, protocol changes are proposed and debated publicly through Ethereum Improvement Proposals (EIPs), implemented by multiple independent teams that maintain competing software clients, and adopted through rough consensus among node operators, validators, and application developers.¹ The nonprofit Ethereum Foundation funds research and development but has repeatedly stated that it does not govern the network and that Ethereum is designed to continue functioning even without it.⁵

History

Origins and crowdsale (2013–2015)

Vitalik Buterin, a programmer and Bitcoin Magazine co-founder, outlined Ethereum's core concept in a white paper in late 2013, proposing a blockchain with a built-in, Turing-complete programming language that would allow developers to build arbitrary decentralized applications rather than being limited to currency-like transactions.¹ Buterin was joined by several co-founders, including Gavin Wood, who authored Ethereum's formal technical specification (the "Yellow Paper") and coined the term "smart contract" in this context, and Joseph Lubin, who later founded the blockchain software company ConsenSys.⁶ The project was funded through a public token presale in mid-2014, in which participants exchanged bitcoin for ether at a starting price of roughly $0.31, raising the equivalent of about $18.3 million.⁶

Launch and early development (2015–2016)

Ethereum's mainnet launched on July 30, 2015, in a release stage called "Frontier."⁶ The following year brought Ethereum's first major crisis: in June 2016, an attacker exploited a vulnerability in the smart contract code of "The DAO," a decentralized venture-fund project that had raised roughly $150 million worth of ether, draining a large portion of its funds.¹ To reverse the theft, a majority of the Ethereum community adopted a contentious hard fork that effectively rolled back the affected transactions; a minority that rejected this intervention as a violation of blockchain immutability continued running the original, unmodified chain, which persists today as the separate cryptocurrency Ethereum Classic.¹

Protocol maturation (2017–2021)

Over the following years, Ethereum underwent a series of scheduled network upgrades — including Homestead, Byzantium, Constantinople, Istanbul, and Berlin — that refined its performance, security, and virtual machine while the network's primary consensus mechanism remained proof of work, similar to Bitcoin's.¹ This period also saw Ethereum become the base layer for an explosion of new activity: the 2017 boom in initial coin offerings, most of which used Ethereum's ERC-20 token standard; the 2020 "DeFi Summer," in which decentralized lending and trading protocols attracted billions of dollars in deposits; and a 2021 boom in NFTs built on the ERC-721 standard.¹ In August 2021, the London upgrade introduced EIP-1559, which restructured Ethereum's transaction fee market by replacing a pure first-price auction with a variable "base fee" that is burned (permanently removed from circulation) rather than paid to miners, a change intended to make fees more predictable and to introduce a deflationary pressure on ETH's supply during periods of high network usage.¹

The Merge and the shift to proof of stake (2022)

Ethereum's most significant technical transition, known as "the Merge," took place on September 15, 2022, when the network's original proof-of-work execution layer merged with a parallel proof-of-stake consensus layer (the "Beacon Chain") that had been running independently since December 2020.¹ The transition replaced energy-intensive mining with a system in which validators stake ether as collateral to propose and attest to new blocks, cutting Ethereum's overall energy consumption by more than 99.9% and ending the issuance of new ETH to miners.¹ The Shapella upgrade in April 2023 completed this transition by enabling validators to withdraw staked ether for the first time, and the Dencun upgrade in March 2024 introduced "blobs" — a cheaper, temporary form of data storage defined by EIP-4844 (proto-danksharding) intended specifically to reduce costs for Layer 2 rollup networks that post transaction data back to Ethereum's base layer.¹

Spot ETFs and institutional adoption (2024)

In May 2024, the U.S. Securities and Exchange Commission approved rule changes allowing spot Ethereum exchange-traded funds to list in the United States, and the first such funds — including products from Grayscale, BlackRock, and Fidelity — began trading on July 23, 2024.⁷ The approval, following a similar wave of spot Bitcoin ETF approvals earlier that year, gave U.S. investors regulated exposure to ETH without needing to hold or custody the asset directly and opened a new channel for institutional demand.⁷

Ethereum Foundation leadership crisis (2025–2026)

The Ethereum Foundation entered a period of sustained internal turmoil beginning in January 2025, as members of the developer community publicly criticized the nonprofit's leadership — particularly long-serving executive director Aya Miyaguchi — amid concerns that Ethereum was losing developer mindshare and market share to faster-moving competitors such as Solana.⁸ Buterin responded by asserting personal authority over the selection of new Foundation leadership, restructuring the organization's executive team, and elevating Miyaguchi to a president role while installing Hsiao-Wei Wang and Tomasz Stańczak as co-executive directors.⁹ The reorganization did not fully resolve the tension: Stańczak departed in February 2026, Wang departed that June following a sabbatical, and at least eight senior Foundation researchers and executives left the organization in the first half of 2026 amid separate warnings from former staff of a funding shortfall for core protocol development teams.⁹¹⁰ Buterin responded to the departures by describing a deliberately "leaner" Foundation focused narrowly on protocol security, decentralization, privacy, and censorship resistance — a set of priorities he termed "CROPS" — rather than broader ecosystem marketing or lobbying.¹¹

Pectra, Fusaka, and continued protocol development (2025–2026)

Despite the leadership turmoil, Ethereum's technical roadmap continued to advance rapidly through 2025. The Pectra upgrade — combining the Prague execution-layer and Electra consensus-layer changes — activated on mainnet on May 7, 2025, bundling eleven EIPs.¹² Its most consequential change, EIP-7702, allowed ordinary wallet addresses to temporarily adopt smart-contract-like behavior, enabling features such as transaction batching, sponsored ("gasless") transactions, and session-based permissions without requiring users to migrate to a new type of account; more than 11,000 such authorizations were created within the first week of the upgrade going live.¹² Pectra separately raised the maximum effective balance a single validator could stake, via EIP-7251, from a fixed 32 ETH to as much as 2,048 ETH, allowing large staking operators to consolidate many small validators into fewer, more efficient ones.¹³

A second major upgrade, Fusaka — combining the Osaka execution-layer and Fulu consensus-layer changes — activated on December 3, 2025, bundling roughly thirteen EIPs.¹⁴ Its headline feature, PeerDAS (defined in EIP-7594), allows validators to verify that Layer 2 transaction data has been made available by sampling only a portion of it rather than downloading it in full, a step toward Ethereum's long-term "danksharding" scaling vision that substantially increased the network's usable blob capacity for rollups.¹⁴ Fusaka also raised Ethereum's default block gas limit to 60 million, roughly double the level in use at the start of 2025, contributing to sharply lower transaction fees on both the Ethereum base layer and Layer 2 networks by mid-2026.¹⁵ Ethereum's roadmap continued with a planned upgrade named "Glamsterdam," targeting the first half of 2026 and expected to include enshrined proposer-builder separation intended to reduce centralization risks around block construction, with a further upgrade named "Hegota" anticipated later in the year.¹²¹⁶

Price cycle and corporate treasuries (2025–2026)

ETH's price climbed through much of 2025, aided by ETF inflows and growing institutional interest, reaching an all-time high of approximately $4,946 in August 2025.⁴ A new corporate-treasury trend also emerged during this period, echoing the Bitcoin corporate-treasury strategy pioneered by Michael Saylor's Strategy: publicly traded companies including BitMine Immersion Technologies (led by investor Tom Lee) and SharpLink Gaming began raising capital specifically to accumulate large ETH holdings, which they typically staked to earn yield.¹⁷¹⁸ By mid-2026, BitMine alone reported holdings of roughly 5.7 million ETH, and combined public-company ETH treasuries were reported in the low millions of tokens.¹⁹ Despite this accumulation, ETH's price fell sharply through late 2025 and into 2026 amid broader crypto-market weakness, concerns about a potential recession, and reports that Buterin himself had sold a portion of his ETH holdings; by mid-2026, spot ETH ETFs had also recorded a period of sustained net outflows even as treasury companies continued buying.³²⁰

Technical design

The Ethereum Virtual Machine and smart contracts

At the core of Ethereum is the EVM, a sandboxed runtime environment in which every participating node executes the same program logic and reaches the same result, allowing smart contracts written in languages such as Solidity to run identically across a fully decentralized network.¹ Executing a transaction or contract call consumes "gas," a unit measuring computational effort, and users pay gas fees denominated in ETH (specifically in a subunit called gwei) to compensate the network for processing their transactions; more computationally intensive operations cost proportionally more gas.¹

Consensus and staking

Since the Merge, Ethereum has used proof-of-stake consensus: participants called validators lock up (stake) a minimum of 32 ETH to propose and vote on new blocks, earning rewards for honest participation and facing penalties, including forced loss of staked funds ("slashing"), for provably malicious or faulty behavior.¹ Rather than staking directly, many ETH holders participate through staking pools or liquid-staking protocols, which has raised recurring concerns about the concentration of staked ETH among a small number of large operators.¹ As of mid-2026, roughly a third of all circulating ETH was staked to secure the network.¹³

Scaling and Layer 2 rollups

Because running a complex computation directly on Ethereum's base layer (referred to as "Layer 1") can be costly during periods of high demand, much of Ethereum's transaction volume has shifted to Layer 2 "rollup" networks — including Arbitrum, Optimism, Base, and zkSync — which execute transactions off Ethereum's main chain and then post compressed transaction data and cryptographic proofs back to Ethereum for final settlement and security.¹ Ethereum's long-term technical roadmap is organized around several informally named phases — the Surge, the Verge, the Purge, and the Splurge — covering, respectively, scaling rollup throughput (including through blobs and danksharding), reducing the resources required to verify the chain via cryptographic techniques such as Verkle trees, simplifying the protocol by removing accumulated technical debt, and a variety of smaller improvements including account abstraction and mitigations for maximal extractable value (MEV).¹⁴¹⁶

Account abstraction

Ethereum has two types of accounts: externally owned accounts (EOAs), controlled by private keys and typically associated with individual users, and contract accounts, controlled entirely by their code.¹ A multi-year effort known as account abstraction has sought to give EOAs more of the flexibility of smart contract accounts — such as sponsored transactions, spending limits, or social account recovery — first through externally deployed infrastructure defined by EIP-4337 and, since Pectra, more directly at the protocol level through EIP-7702.¹²¹⁵

Governance and development

Ethereum has no chief executive, and changes to the protocol proceed through public technical proposals (EIPs) that must be implemented across multiple independently developed software clients and voluntarily adopted by the network's validators and node operators.¹ The Ethereum Foundation, a Swiss nonprofit, has historically played an outsized role in funding client teams, researchers, and core protocol work, but its authority is informal rather than constitutional, and its 2025–2026 leadership crisis — marked by public criticism, a wave of senior staff departures, and Buterin's own repeated public statements that he holds no special power beyond that of any other Foundation board member — illustrated both the practical influence the Foundation has historically wielded and the limits of that influence within Ethereum's broader decentralized governance model.⁸¹¹

Token economics

Unlike Bitcoin, ETH has no fixed maximum supply; instead, its net supply growth depends on the balance between new issuance to validators and the amount of ETH burned as base transaction fees under EIP-1559, a balance that has caused ETH's circulating supply to expand or mildly contract depending on network activity.¹ As of mid-2026, Ethereum's circulating supply stood at approximately 120–121 million ETH.¹³ Institutional holding of ETH has grown substantially since the 2024 approval of U.S. spot ETH ETFs, and a distinct wave of publicly traded companies has since adopted ETH-focused treasury strategies, often combined with active staking to generate yield, a structural difference from most Bitcoin corporate treasuries, which do not generate a native yield.¹⁷¹⁸

Staking yields, which have historically ranged from roughly 3% to 4% annually depending on total network participation, have been cited by both individual and corporate holders as a meaningful point of differentiation from Bitcoin, whose proof-of-work design offers no comparable native return to holders who are not themselves miners.¹⁷

Ecosystem

Ethereum underpins the large majority of decentralized finance activity in the cryptocurrency industry, including lending protocols, decentralized exchanges, and the majority of major stablecoins, most of which are issued as ERC-20 tokens.¹ It has also served as the primary settlement and issuance layer for non-fungible tokens under the ERC-721 and ERC-1155 standards, for decentralized autonomous organizations that use onchain voting to manage shared treasuries, and for a large ecosystem of Layer 2 networks that inherit Ethereum's security while offering substantially lower transaction costs.¹

Layer 2 rollups fall into two broad technical categories: optimistic rollups, such as Arbitrum and Optimism, which assume transactions are valid by default and allow a window for fraud proofs to challenge incorrect results, and zero-knowledge (validity-proof) rollups, such as zkSync and Linea, which submit cryptographic proofs of correctness alongside every batch of transactions.¹ By 2026, several of these networks had themselves grown into significant ecosystems with their own governance tokens, developer communities, and, in some cases, ambitions to closely align their technical roadmaps with Ethereum's own upgrade schedule.¹⁵

Criticism and challenges

Ethereum has faced sustained criticism and competitive pressure on several fronts. Prior to the Merge, its proof-of-work consensus mechanism drew significant criticism over its energy consumption, a concern the 2022 transition to proof of stake substantially addressed.¹ Since then, critics have instead focused on the complexity and cost of using Ethereum's base layer directly during periods of congestion (an issue the Dencun, Pectra, and Fusaka upgrades have progressively addressed for Layer 2 users), the concentration of staked ETH among a small number of large liquid-staking and exchange-based providers, and the systemic risk and user-experience fragmentation created by an increasingly large number of separate Layer 2 networks.¹ Ethereum has also faced growing competition from alternative "Layer 1" blockchains, most notably Solana, which offer higher raw throughput at the base layer, and this competitive pressure was cited by critics as a contributing factor in the developer and community frustration that fueled the Ethereum Foundation's 2025–2026 leadership crisis.⁸ More broadly, ETH's price has exhibited significant volatility, including a decline of roughly two-thirds from its August 2025 all-time high through mid-2026, a period that coincided with both the Foundation's internal turmoil and broader weakness across cryptocurrency markets.²⁰

References