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

EthereumDevelopers 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

  • Ethereum
    ImageEthereum

    GitR0n1n, Public domain, via Wikimedia Commons

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