Core definition and technology
Ethereum, with the native asset ETH, is a decentralized, open-source blockchain designed to run programmable smart contracts and decentralized applications, or dApps. Unlike blockchains focused primarily on recording payments, Ethereum maintains a globally replicated state that includes user accounts, balances, smart-contract code, and application data.
ETH serves several roles within the network:
- Paying transaction and smart-contract execution fees.
- Providing economic security through staking.
- Acting as collateral and a settlement asset across DeFi.
- Serving as a base asset for tokens, applications, and Layer 2 networks.
Ethereum is generally classified as a smart-contract platform and Layer 1 blockchain. It is the second-largest cryptocurrency by market capitalization and remains one of the most widely integrated programmable blockchain networks.
The Ethereum Virtual Machine
The Ethereum Virtual Machine, or EVM, is the execution environment used by Ethereum nodes. It runs smart-contract bytecode according to a common specification, so that the same transaction produces the same state change on every properly operating node.
Important EVM characteristics include:
- A deterministic execution model.
- A stack-based architecture with a stack depth of 1,024 items.
- Operations based on 256-bit words, which are suitable for cryptographic calculations.
- Gas metering, which charges users for computational resources and limits denial-of-service attacks.
- Support for persistent contract code and data stored at blockchain addresses.
Smart contracts are programs deployed to Ethereum that execute when triggered by transactions or other contracts. They can implement financial markets, token systems, games, marketplaces, governance mechanisms, identity systems, and many other applications.
Smart contracts cannot directly retrieve information from outside the blockchain. Applications that need prices, weather data, sports results, or other off-chain information generally use oracle networks such as Chainlink.
Account-based architecture
Ethereum uses an account-based model rather than the unspent transaction output, or UTXO, model used by Bitcoin.
There are two principal account types:
| Account type | Description | |
|---|---|---|
| Externally owned account, or EOA | Controlled by a private key and typically used to initiate transactions | |
| Contract account | Controlled by deployed code and activated by transactions or other contracts |
This model makes it easier for applications to interact with one another. A decentralized exchange, lending protocol, stablecoin, and wallet can all call one another’s contracts within a single transaction, creating Ethereum’s highly composable application environment.
Layered network design
Ethereum separates different network responsibilities into layers:
| Layer | Main function | |
|---|---|---|
| Execution layer | Processes transactions, executes EVM code, calculates gas, and updates account and contract state | |
| Consensus layer | Coordinates validators, block proposals, attestations, fork choice, and finality through Proof of Stake | |
| Data-availability layer | Makes blockchain and rollup data available to nodes and Layer 2 networks, increasingly through blob data |
This separation allows individual components to evolve independently. It also supports Ethereum’s modular scaling strategy, in which Ethereum provides settlement and security while Layer 2 networks handle much of the transaction execution.
How Ethereum reaches consensus
Proof of Stake and The Merge
Ethereum currently uses Proof of Stake. The transition from Proof of Work was completed on September 15, 2022, in an event known as The Merge. The existing execution layer was combined with the Beacon Chain’s Proof-of-Stake consensus layer, ending Ethereum mining.
Ethereum.org estimates that the transition reduced the network’s energy consumption by approximately 99.95%. Security is now based on ETH deposited by validators rather than computing power and electricity consumption.
A native validator traditionally deposits 32 ETH and operates:
- An execution client.
- A consensus client.
- A validator client.
Pectra increased the maximum effective balance for validators from 32 ETH to 2,048 ETH. This improves operational efficiency for large staking operators, while users with smaller balances can still participate through staking pools and other services.
Validator operation and finality
Ethereum’s consensus clock is divided into 12-second slots, with 32 slots forming an epoch. A validator is pseudorandomly selected to propose a block in each slot. Other validators attest to the block and the chain they consider valid.
Ethereum uses:
- LMD-GHOST for fork choice, selecting the branch with the greatest attestation weight.
- Checkpoint-based finality, which makes finalized blocks economically difficult to reverse.
- Rewards for correct proposals, attestations, and other duties.
- Penalties for inactivity or incorrect behavior.
- Slashing for certain forms of deliberate conflicting or malicious behavior.
The security model does not require every validator to be honest. Instead, it makes attacks expensive by placing a large quantity of ETH at risk. A validator that attempts to undermine consensus can lose part of its stake and may be removed from the active validator set.
Security is further supported by Ethereum’s large validator community, long operating history since 2015, mature client implementations, and emphasis on client diversity and independent development teams.
Scaling through Layer 2 networks
Ethereum’s main scaling strategy is rollup-centric. Rather than processing every transaction directly on the base layer, Layer 2 networks execute transactions separately, batch them, and post relevant data and settlement information back to Ethereum.
Rollups generally fall into two categories:
| Rollup type | How it works | |
|---|---|---|
| Optimistic rollup | Assumes submitted transactions are valid by default and allows challenges through fraud-proof mechanisms | |
| Zero-knowledge rollup | Provides cryptographic validity proofs showing that a batch was executed correctly |
Major Ethereum Layer 2 ecosystems include Arbitrum, Optimism, and Base. These networks are compatible with Ethereum accounts and the EVM, allowing developers to reuse much of their existing code and tooling.
Layer 2 networks can reduce transaction fees and increase throughput by batching many user operations before submitting compressed data to Ethereum. However, their security and decentralization are not identical. Users must consider each network’s:
- Proof system.
- Bridge design.
- Data-availability model.
- Sequencer arrangements.
- Upgrade controls.
- Ability to reconstruct state from data published to Ethereum.
Dencun and Proto-Danksharding
The Dencun upgrade activated on March 13, 2024. Its most important scaling feature was Proto-Danksharding, introduced through EIP-4844.
EIP-4844 introduced blob-carrying transactions. Blobs provide temporary data space for rollups to publish compressed transaction information. They use a separate fee market from ordinary execution gas and are intended for data availability rather than permanent application storage.
Blob data is generally pruned from node history after approximately 18 days, while cryptographic commitments and the information needed to verify rollup state remain anchored to Ethereum. The upgrade substantially reduced the cost of publishing Layer 2 data, although it did not directly reduce the execution cost of unrelated Ethereum mainnet transactions.
PeerDAS and Fusaka
The Fusaka upgrade went live on December 3, 2025. It introduced Peer Data Availability Sampling, or PeerDAS.
PeerDAS allows nodes and validators to verify the availability of blob data by sampling portions of distributed data instead of downloading every complete blob. This reduces bandwidth requirements and is intended to support roughly an order-of-magnitude increase in data-availability capacity for Layer 2 networks.
Fusaka also introduced Blob Parameter Only, or BPO, forks, which allow blob throughput parameters to be adjusted independently of a larger named upgrade.
Main use cases
Decentralized finance
Ethereum is a major settlement and liquidity layer for decentralized finance, including:
- Decentralized exchanges.
- Lending and borrowing markets.
- Stablecoins.
- Liquid staking.
- Derivatives.
- Structured financial products.
- On-chain insurance.
- Asset management.
- Payment applications.
Protocols such as Uniswap, Aave, MakerDAO/Sky, Curve, Lido, and Compound were built around Ethereum or have deep Ethereum integrations. Ethereum’s role in DeFi is supported by its liquidity, mature developer tools, extensive auditing ecosystem, and composability between applications.
A 2026 Ethereum Foundation comparison cited approximately $56 billion in Ethereum DeFi total value locked, compared with roughly $6.9 billion for Solana in that comparison. Figures vary depending on the measurement date, assets included, and whether Layer 2 networks are counted separately.
Stablecoins and payments
Ethereum is a major settlement network for stablecoins including USDC, USDT, DAI, and PYUSD.
Stablecoins on Ethereum are used for:
- Cross-border transfers.
- Trading and market settlement.
- DeFi collateral.
- Treasury operations.
- Payments.
- Dollar-denominated savings and settlement in regions with limited access to traditional banking.
Ethereum’s broad wallet, exchange, custody, and infrastructure support makes it an important base network for stablecoin issuers and financial applications.
NFTs and digital ownership
Ethereum established widely used NFT standards:
- ERC-721, commonly used for unique tokens.
- ERC-1155, which supports semi-fungible and multi-token applications.
These standards enabled digital collectibles, artwork, tickets, memberships, in-game assets, intellectual-property experiments, and other forms of digital ownership. NFT activity has expanded to other blockchains and Ethereum Layer 2 networks, but Ethereum remains important for higher-value issuance, settlement, and marketplace infrastructure.
Token issuance
The ERC-20 standard became the dominant framework for fungible token issuance. Thousands of governance tokens, stablecoins, application tokens, and ecosystem incentives use ERC-20 or compatible designs.
Ethereum’s shared standards reduce integration costs. A token issued under a recognized standard can often be supported by wallets, exchanges, custody providers, DeFi protocols, and analytics systems without each service needing a custom integration.
Institutional and enterprise applications
Institutional use cases increasingly focus on:
- Stablecoin settlement and payments.
- Tokenized funds and securities.
- Collateral and settlement infrastructure.
- Custody and compliance.
- Permissioned or hybrid blockchain systems.
- Interoperable financial applications.
The Enterprise Ethereum Alliance was created to coordinate companies, technology providers, startups, and Ethereum developers around enterprise use cases. Its membership and working groups address privacy, scalability, security, interoperability, and implementation standards.
Organizations associated with Ethereum enterprise integrations have included ConsenSys, Microsoft, Accenture, Banco Santander, BNY Mellon, CME Group, Intel, and JPMorgan, among others. ConsenSys also developed Quorum, an Ethereum-derived enterprise protocol. Microsoft and ConsenSys previously collaborated to provide Ethereum-based development and infrastructure services through Microsoft Azure.
In July 2026, Ethereum Institutional, an independent nonprofit organization, launched with a stated focus on institutional finance, standards, and enterprise adoption.
Founding team and project history
Origins
Ethereum was proposed by Vitalik Buterin in late 2013. The objective was to create a blockchain capable of executing general-purpose applications, rather than limiting the network primarily to peer-to-peer payments.
Buterin published the Ethereum whitepaper in 2013–2014 and presented the project publicly at the North American Bitcoin Conference in Miami in January 2014.
The founding group is often described as consisting of eight co-founders, although the exact composition and timing can vary across historical accounts:
| Contributor | Role and later involvement | |
|---|---|---|
| Vitalik Buterin | Originator of the Ethereum concept, whitepaper author, and principal early architect | |
| Gavin Wood | Wrote the Yellow Paper, helped design the EVM, and contributed to Solidity; later founded Polkadot and Web3 Foundation | |
| Joseph Lubin | Helped finance and organize early development; later founded ConsenSys | |
| Charles Hoskinson | Participated in early organizational development and later co-founded Cardano | |
| Anthony Di Iorio | Helped finance and organize the early project | |
| Mihai Alisie | Participated in early organizational and legal structuring and co-founded Bitcoin Magazine with Buterin | |
| Amir Chetrit | Participated in the earliest organizational efforts | |
| Jeffrey Wilcke | Contributed early client software, including a Go implementation |
The Ethereum Foundation was established in Switzerland in 2014 as a nonprofit supporting protocol development and the wider ecosystem. It does not own Ethereum, operate the network, or unilaterally control upgrades. Development is distributed across independent client teams, researchers, validators, application developers, infrastructure providers, and community organizations.
2014 Ether sale
Ethereum conducted a public Ether presale from July to September 2014. The sale raised approximately 31,000 to 31,500 BTC, worth about $18 million to $18.5 million at the time.
Participants purchased future ETH before the network launched. The ETH was not usable or transferable until the blockchain went live. The sale financed protocol development, client software, legal organization, and infrastructure.
Most of the initial genesis supply was allocated to crowdsale participants, with the remainder assigned to the Ethereum Foundation and early contributors.
Frontier mainnet launch
Ethereum’s first public mainnet release, Frontier, launched on July 30, 2015, when the genesis block was created. Frontier was described as a live but basic release intended mainly for developers and technically experienced users.
The early network used Proof of Work and had a restrictive initial gas limit of 5,000 units per block. Homestead, the first major planned upgrade, activated on March 14, 2016, moving Ethereum toward broader use.
The DAO hack and Ethereum Classic
In 2016, a vulnerability in The DAO, a decentralized investment organization built using Ethereum smart contracts, allowed an attacker to drain more than 3.6 million ETH.
The incident did not result from a failure of Ethereum’s base consensus mechanism. Instead, it exposed a vulnerability in an application-level smart contract. The event generated a major debate about immutability, neutrality, and whether the blockchain should be altered to recover the affected funds.
The majority community supported a hard fork on July 20, 2016. The forked chain retained the Ethereum name and ETH asset, while participants who rejected the intervention continued the original chain, which became Ethereum Classic and uses ETC.
The DAO incident had lasting consequences. It demonstrated that public blockchain governance includes a social and coordination layer, and it encouraged greater emphasis on smart-contract audits, formal verification, security research, and safer development practices.
ETH tokenomics
Current market snapshot
The supplied market snapshot reports the following figures:
| Metric | Value | |
|---|---|---|
| Price | $2,466.21 | |
| Market capitalization | $297.62 billion | |
| Market rank | #2 | |
| Circulating supply | 120,681,146 ETH | |
| Total supply | 120,681,146 ETH | |
| Fully diluted valuation | $297.62 billion | |
| 24-hour volume | $17.13 billion |
These figures represent a point-in-time snapshot and can change continuously with market price, network issuance, and fee burning.
Supply structure
Unlike Bitcoin, Ethereum does not have a fixed maximum supply. Its supply is dynamic and depends mainly on:
- ETH issued to Proof-of-Stake validators.
- ETH burned through transaction fees under EIP-1559.
The reported circulating and total supply are both approximately 120.68 million ETH in the snapshot. No maximum supply is specified.
EIP-1559 fee burn
EIP-1559 was implemented in August 2021. It introduced a base fee that is burned rather than paid to validators. When users transact on Ethereum, the amount of ETH burned depends on the network’s base fee and the amount of gas consumed.
This creates a direct link between network usage and ETH supply:
- Higher network activity can increase the amount of ETH burned.
- Lower activity can reduce the burn rate.
- The burn applies to the base fee, while validators receive tips and staking-related rewards.
Staking issuance
Proof-of-Stake validators receive ETH for proposing blocks, attesting correctly, and performing other consensus duties. Issuance depends partly on the total amount of ETH staked and network participation.
ETH can therefore be:
| Network condition | Supply effect | |
|---|---|---|
| Staking issuance exceeds fee burn | Net inflation | |
| Fee burn exceeds staking issuance | Net deflation | |
| Issuance and burn are approximately balanced | Relatively stable supply |
This dynamic model means ETH is not permanently inflationary or permanently deflationary. During periods of heavy network usage, fee burn can exceed issuance and reduce supply. During quieter periods, issuance may exceed burn.
Distribution
The original ETH distribution came primarily from the 2014 crowdsale, together with allocations for the Ethereum Foundation and early contributors. Over time, ownership has become distributed among retail users, exchanges, institutions, staking providers, DeFi protocols, and other ecosystem participants.
The network’s supply is also functionally distributed across:
- Staked ETH securing consensus.
- ETH held in wallets and exchange accounts.
- ETH used as DeFi collateral.
- ETH held by Layer 2 bridges and infrastructure.
- ETH used to pay transaction fees.
Competitive position
Ethereum competes with Layer 1 networks such as Solana, BNB Chain, Avalanche, Sui, Aptos, and others. The comparison involves more than transaction speed. It includes security, liquidity, developer activity, decentralization, user experience, institutional support, and scalability.
Ethereum’s main advantages
Security and settlement credibility. Ethereum has operated continuously since 2015 and is protected by a large validator ecosystem, substantial economic value, multiple client teams, and a mature research and development process.
Deep liquidity and application integration. Major DeFi, stablecoin, NFT, and tokenization systems support Ethereum. This creates network effects: users attract applications, applications attract liquidity, and liquidity encourages further integration.
Mature developer infrastructure. Ethereum benefits from Solidity, the EVM, extensive documentation, development frameworks, wallets, auditing firms, node providers, custodians, and infrastructure services such as Infura, Alchemy, Etherscan, Chainlink, and The Graph.
Institutional compatibility. Banks, asset managers, custody providers, and enterprises can access an established ecosystem of compliance, settlement, tokenization, and infrastructure tools.
Modular scaling. Ethereum does not need to process every transaction directly on its base layer. Rollups and other Layer 2 systems can provide cheaper and higher-throughput execution while using Ethereum for settlement and data availability.
Ethereum compared with Solana
Solana generally emphasizes high-throughput, low-cost execution directly on its base layer. Ethereum emphasizes a secure and decentralized settlement layer combined with a network of Layer 2 execution environments.
| Dimension | Ethereum | Solana | |
|---|---|---|---|
| Scaling model | Modular, rollup-centric | More monolithic, with substantial base-layer execution | |
| Base-layer costs and speed | Generally higher-cost and lower-throughput than high-speed competitors | Generally faster and cheaper for direct base-layer activity | |
| Ecosystem strength | Deep DeFi liquidity, institutional integrations, EVM tooling, and Layer 2 network effects | Strong growth in consumer applications, trading, payments, and direct on-chain execution | |
| Main tradeoff | Greater ecosystem complexity and fragmentation across Layer 2 networks | Strong execution performance, with different decentralization and infrastructure tradeoffs | |
| Developer trends | Very large ecosystem when Layer 2 networks are included | Attracted more new developers than Ethereum during parts of 2024 and 2025 |
Developer comparisons vary depending on whether developers working on Arbitrum, Base, Optimism, and other Layer 2 networks are counted as part of Ethereum’s ecosystem or separately. Consequently, Solana’s strong new-developer growth does not eliminate Ethereum’s broader network effect.
Ethereum’s value proposition is less about being the fastest single chain and more about functioning as a widely integrated settlement and coordination layer for interconnected chains.
Roadmap and current development
Ethereum’s roadmap focuses on scalability, security, decentralization, efficiency, and usability. Its broad roadmap themes are commonly described as:
| Roadmap phase | General focus | |
|---|---|---|
| The Surge | Rollup scaling, blob expansion, data availability, and Danksharding-related technologies | |
| The Verge | Easier verification and participation, including more efficient or stateless validation | |
| The Purge | Removing unnecessary historical and protocol complexity to reduce node operating burdens | |
| The Splurge | Additional optimizations, refinements, and longer-term improvements |
These labels represent broad development directions rather than a rigid corporate release schedule. Upgrades require research, specifications, client implementations, testing, security review, and coordination across the Ethereum community.
Major completed upgrades
| Upgrade | Date | Main significance | |
|---|---|---|---|
| Beacon Chain | December 1, 2020 | Began the transition to Proof of Stake | |
| The Merge | September 15, 2022 | Replaced Proof-of-Work mining with validator-based consensus | |
| Shapella | April 12, 2023 | Enabled withdrawals of staked ETH and staking rewards | |
| Dencun | March 13, 2024 | Introduced EIP-4844 blob transactions and Proto-Danksharding | |
| Pectra | May 7, 2025 | Improved account functionality, validator operations, and Layer 2 capacity | |
| Fusaka | December 3, 2025 | Introduced PeerDAS and additional blob-scaling mechanisms |
Pectra
Pectra combined execution-layer and consensus-layer changes. Key features included:
- EIP-7702: Allows EOAs to temporarily execute smart-contract code, enabling transaction batching, gas sponsorship, and more flexible wallets.
- EIP-7251: Raised the maximum effective validator balance from 32 ETH to 2,048 ETH.
- EIP-6110: Moved validator deposit information into the execution layer and shortened validator onboarding.
- EIP-7691: Increased blob throughput before PeerDAS.
- EIP-2537: Added precompiles for BLS12-381 cryptographic operations.
- EIP-2935: Added a system contract for serving recent historical block hashes, supporting future stateless-execution designs.
Fusaka
Fusaka focused on data availability, scaling, and network efficiency. PeerDAS allows validators and nodes to sample portions of blob data rather than downloading each complete blob. This is intended to make higher rollup data capacity possible without proportionally increasing validator bandwidth and storage requirements.
Fusaka also included mechanisms for independently increasing blob targets through BPO forks, as well as improvements related to history expiry, execution-layer configuration, and simpler receipts.
Glamsterdam and Hegotá
As of the Ethereum roadmap updated August 27, 2026, Glamsterdam is listed as an upgrade in development for 2026, followed by Hegotá as a planned development phase.
Proposed Glamsterdam themes include:
- Continued scaling and performance improvements.
- Block-level access lists.
- Enshrined proposer-builder separation.
- Further protocol efficiency improvements.
Activation dates and final scope remain subject to research, client implementation, testing, security analysis, and community coordination. Roadmap entries should therefore be understood as development targets rather than guaranteed release dates.
Key ecosystem integrations
Ethereum’s ecosystem is defined less by a small number of formal corporate partnerships and more by extensive integration across crypto and financial infrastructure.
| Category | Examples | |
|---|---|---|
| Wallets | MetaMask, Coinbase Wallet, Rabby, Trust Wallet | |
| Exchanges | Nearly all major centralized exchanges list ETH | |
| Stablecoins | USDC, USDT, DAI, PYUSD | |
| DeFi | Uniswap, Aave, MakerDAO/Sky, Curve, Lido, Compound | |
| Infrastructure | Chainlink, The Graph, Infura, Alchemy, Etherscan | |
| Layer 2 networks | Arbitrum, Optimism, Base, zkSync, Starknet, Scroll, Linea | |
| Institutional services | Custody, tokenization, settlement, payments, compliance, and infrastructure providers |
Ethereum’s ecosystem benefits from interoperability. A wallet can interact with multiple applications, a stablecoin can serve as collateral across lending protocols, and Layer 2 networks can use Ethereum as a common settlement and data-availability layer.
Principal risks and tradeoffs
Ethereum’s design offers significant functionality, but it also creates challenges:
- Complexity: The base layer, consensus layer, Layer 2 networks, bridges, sequencers, proof systems, and wallets create a complicated user and developer environment.
- Layer 2 fragmentation: Applications and liquidity may be distributed across multiple networks, creating interoperability and user-experience challenges.
- Smart-contract risk: Applications built on Ethereum can contain bugs even when the underlying blockchain is functioning correctly.
- Bridge risk: Moving assets between Ethereum and Layer 2 or other chains introduces additional contracts and infrastructure that can be attacked or fail.
- Validator and node-resource concerns: Increasing capacity must be balanced against the need for ordinary participants to run nodes and verify the network.
- Competition: High-throughput chains such as Solana continue to compete for users, developers, liquidity, and applications.
- Dynamic monetary policy: ETH has no fixed maximum supply, and its net inflation or deflation depends on staking participation and network fee activity.
- Governance coordination: Ethereum’s decentralized upgrade process can be slower and more complex than development on a centrally coordinated blockchain.
Overall significance
Ethereum’s central contribution to cryptocurrency is the creation of a general-purpose, programmable settlement network. Its EVM provides a common execution environment, smart contracts enable composable applications, Proof of Stake supplies economic security, and rollups extend capacity beyond the base layer.
The network’s competitive position rests on a combination of:
- Long operating history.
- Deep liquidity.
- Large developer and application ecosystem.
- Broad institutional and infrastructure support.
- Extensive token and smart-contract standards.
- Strong settlement and security reputation.
- A modular roadmap designed to scale through Layer 2 networks and improved data availability.
ETH is therefore not only a payment token. It is the asset used to pay for computation, secure consensus, settle transactions, support DeFi collateral, and connect a broad network of applications and Layer 2 systems.