Ethereum is the blockchain that turned crypto into a programmable platform rather than just a payments network. Launched in 2015 by Vitalik Buterin and a founding team, it introduced smart contracts — self-executing code running on the Ethereum Virtual Machine (EVM) — and became the default settlement layer for DeFi, NFTs and stablecoin issuance in the process.
What Ethereum does
Every major DeFi protocol, most stablecoins by transaction volume, and the bulk of NFT trading history live on Ethereum or on chains that copied its EVM standard. In September 2022, 'The Merge' shifted the network from energy-intensive proof-of-work to proof-of-stake, cutting Ethereum's energy use by over 99% and turning ETH into a yield-bearing asset through staking, which now secures the chain via validators rather than miners.
Ethereum's roadmap has since gone rollup-centric: rather than scaling the base layer directly, the network offloads execution to layer-2s like Arbitrum, Optimism and Base, which post compressed data back to Ethereum for security. The 2024 Dencun upgrade introduced 'blobs' — cheap data storage for rollups — slashing L2 transaction fees by well over 90% and pushing most retail activity off the mainnet entirely.
Risks
That L2 strategy is also Ethereum's biggest tension: as activity migrates to rollups, base-layer fee revenue has thinned, undercutting the 'ultrasound money' narrative that relied on fee burns shrinking ETH supply. Validator and relay concentration around a small number of staking pools and MEV infrastructure providers raises centralization concerns of its own. Ethereum also faces genuine competitive pressure from faster, cheaper layer-1s like Solana, and regulators in the US have never fully settled whether staked ETH counts as a security.
None of that has dislodged Ethereum's position as the deepest, most audited smart-contract environment in crypto — but its edge now rests on execution of a complex, multi-layer roadmap rather than first-mover advantage alone.