Ethereum
Quick Definition
A decentralized blockchain platform that enables smart contracts and decentralized applications (dApps), powered by its native cryptocurrency Ether (ETH).
What Is Ethereum?
Ethereum is a decentralized, open-source blockchain platform launched in 2015 by Vitalik Buterin and a team of co-founders. While Bitcoin was designed primarily as a digital currency, Ethereum was built as a programmable blockchain — a "world computer" that can execute code in the form of smart contracts. This programmability makes Ethereum the foundation for decentralized finance (DeFi), non-fungible tokens (NFTs), decentralized autonomous organizations (DAOs), and thousands of other decentralized applications.
Ether (ETH) is Ethereum's native cryptocurrency, used to pay transaction fees (called "gas") and compensate validators who secure the network. In September 2022, Ethereum completed "The Merge," transitioning from an energy-intensive proof-of-work consensus mechanism to proof-of-stake, reducing the network's energy consumption by approximately 99.95%. Under proof-of-stake, validators lock up (stake) ETH as collateral to participate in block validation.
Ethereum's ecosystem is the largest in crypto by developer activity, total value locked (TVL) in DeFi protocols, and number of deployed smart contracts. Layer-2 scaling solutions like Arbitrum, Optimism, and Base have emerged to address Ethereum's scalability limitations by processing transactions off the main chain while inheriting its security. Ethereum's roadmap includes further upgrades focused on scalability, security, and sustainability.
Ethereum Example
- 1After The Merge in September 2022, Ethereum's annual energy consumption dropped from approximately 112 TWh (comparable to the Netherlands) to roughly 0.01 TWh — a 99.95% reduction that addressed one of crypto's most significant environmental criticisms.
- 2Ethereum hosts over $50 billion in total value locked across DeFi protocols, including lending platforms like Aave, decentralized exchanges like Uniswap, and liquid staking protocols like Lido.
Related Terms
Smart Contract
Self-executing code stored on a blockchain that automatically enforces the terms of an agreement when predefined conditions are met, without intermediaries.
DeFi (Decentralized Finance)
A financial ecosystem built on blockchain technology that provides traditional financial services like lending, borrowing, and trading without centralized intermediaries.
Gas Fee
The transaction fee paid to blockchain validators for processing and validating transactions, denominated in the network's native cryptocurrency.
Proof of Stake
A blockchain consensus mechanism where validators lock up (stake) cryptocurrency as collateral to earn the right to validate transactions and create new blocks.
Layer 1 / Layer 2
Layer 1 refers to the base blockchain network (like Ethereum); Layer 2 refers to scaling solutions built on top that process transactions faster and cheaper.
ERC-20
A technical standard on the Ethereum blockchain that defines a common set of rules for creating fungible tokens, enabling interoperability across wallets, exchanges, and DeFi protocols.
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