July 30, 2015
Ethereum mainnet launches
Ethereum's Frontier mainnet went live on July 30, 2015 — opening a public blockchainA distributed ledger where records are chained cryptographically — designed for tamper-resistant shared state. where anyone could deploy smart contractPrograms on a blockchain that run automatically when conditions are met — used in DeFi and NFTs.s with ether gas.
What it was for
Developers compiled Solidity to EVM bytecodeIntermediate instructions produced by compilers — often executed by a virtual machine rather than the CPU directly. and deployed with `geth` or Mist wallets. The ICO boom, UniswapA decentralized exchange protocol on Ethereum — automated market makers for token swaps., and NFTNon-fungible token — a blockchain record proving ownership of a unique digital asset. standards all ran on this chain. proof-of-workA consensus mechanism — miners compete to solve puzzles to validate blocks and earn rewards. mining secured the network until the 2022 Merge moved consensus to proof-of-stake.
Why it's here
Frontier turned Ethereum from a crowdsale promise into a live smart-contract platform.
Why it mattered
It launched the dominant programmable blockchainA distributed ledger where records are chained cryptographically — designed for tamper-resistant shared state. for DeFiDecentralized finance — lending, trading, and derivatives on blockchains without traditional banks. and Web3 apps.
What it solved
Builders needed a production network to test unstoppable programs with real economic stakes.
Media
- ImageEthereum
GitR0n1n, Public domain, via Wikimedia Commons
Related
- Ethereum whitepaper publishedNovember 27, 2013
- ERC-20 token standard finalizedNovember 19, 2015
- The DAO exploited on EthereumJune 17, 2016
- Ethereum Merge completesSeptember 15, 2022