A history of Ethereum

From a whitepaper posted to a cryptography mailing list to a network settling billions of dollars in assets, in chronological order. Dates before late 2024 are settled history; the final entries are closer to the present and described more cautiously.

2013 Vitalik Buterin, then a teenager writing for Bitcoin Magazine, publishes a whitepaper proposing a blockchain that runs arbitrary programs rather than only payments. The idea circulates in late 2013 and gathers co-founders through early 2014.
2014 The Ethereum Foundation is established and a public crowdsale runs in mid-2014, raising roughly $18 million, at the time the largest crypto fundraiser ever. The Ethereum Virtual Machine, Solidity, and the first testnets take shape during the build-up.
2015 Frontier goes live on July 30: a bare-bones network aimed at developers. The first real user-facing release, Homestead, arrives in March 2016 with protocol hardening and friendlier tooling.
2016 A crowdfunded investment vehicle called The DAO raises an extraordinary share of all ETH, then an attacker drains roughly 3.6M ETH from a reentrancy flaw. After a contentious community decision, most of the network hard-forks to restore the funds; the minority that continues the original chain becomes Ethereum Classic. The split permanently shaped Ethereum's governance norms.
2017 Byzantium (October) delivers the first half of the Metropolis milestone: cheaper operations, cryptography primitives, and delayed difficulty growth. The year belongs, however, to the token boom: the ERC-20 standard makes issuing an asset nearly free, and initial coin offerings crowd the network.
2018 A deep bear market. Protocol work continues quietly: Constantinople is prepared through the year, and research into proof-of-stake and sharding advances in public.
2019 Constantinople (February) reduces certain gas costs and lays groundwork for the consensus transition; Istanbul (December) is a final housekeeping hard fork before the proof-of-stake track takes over the roadmap.
2020 The Medalla public testnet rehearses proof-of-stake in the summer; on December 1 the beacon chain genesis block is produced, with thousands of validators staking on a chain that carries no transactions yet. On the execution side, "DeFi summer" shows what composable protocols can do, and gas prices spike accordingly.
2021 London (August 5) enacts EIP-1559: transactions pay a burned base fee plus a tip, making fee estimation predictable and tying ETH supply to network activity. Altair (October) upgrades the beacon chain's reward rules. In November ETH trades near its all-time high, roughly $4,900.
2022 The Merge, September 15: the execution layer plugs into the beacon chain and proof-of-work mining ends. Energy use falls by an estimated 99.9% or more overnight, and the issuance of new ETH drops sharply. A brutal market year elsewhere barely dents the protocol's trajectory.
2023 Shapella (April 12) lets stakers withdraw for the first time, removing the biggest lingering question about proof-of-stake economics. Development shifts to blob data; layer-2 networks grow into the main scaling story.
2024 Dencun (March 13) introduces blob-carrying transactions (EIP-4844, proto-danksharding): a dedicated, cheaper data lane for rollups. Layer-2 fees fall by an order of magnitude within days, moving large swaths of user activity off the base layer by design.
2025 Pectra pairs execution and consensus changes: regular accounts can delegate to contract code (EIP-7702), validator effective balances consolidate up to 2,048 ETH, blob throughput roughly doubles, and new cryptography primitives are added. Account-abstraction features start reaching ordinary wallets.
since Rollout of the next scaling wave, notably PeerDAS for blob data availability, has been underway; its staged activation and everything after it are best tracked on the official roadmap rather than in a static guide.