The Beacon Chain launches Ethereum's proof-of-stake genesis, running parallel to mainnet for twenty-one months

DEC 01 2020 · 12:05

Video: [Ethereum 2.0 Explained] Part II | Phase 0 and the Beacon Chain Date: 2020-12-01 · Type: ethereum · Tags: proof-of-stake, beacon-chain, ethereum, consensus, validators, 2020 524,288 ETH was the minimum. The community sent double. Then they waited. The Beacon Chain went live at 12:00:23 UTC on December 1 2020, conditional on a minimum of 524,288 ETH staked across 16,384 validators by the launch threshold. The community met that threshold with room to spare; by genesis, over 21,000 validators had deposited. The initial annualized yield was roughly 22%, normalizing to 4–5% as the validator set grew. What the chain would not do, for the next twenty-one months, was finalize anything on the execution layer. It ran in parallel, certifying nothing in production, accumulating validators and building confidence in the consensus code. The operational caution was deliberate and historically unusual. Competitor chains — Cardano, Polkadot, Solana — had made their PoS transitions more dramatically, with faster timelines and less staged handover. Ethereum's approach was slower, more expensive in engineering time, and more conservative. The payoff was that when The Merge finally came in September 2022, there was nearly two years of live Beacon Chain data validating the consensus layer's behavior. No major chain migration had ever been staged this carefully. The Beacon Chain also represented a subtle shift in Ethereum's power structure. PoS validators replaced miners as the chain's securing constituency — a shift from capital-equipment owners (GPU and ASIC farms, concentrated in China and the American West) to ETH holders willing to lock 32-ETH increments. The geographic distribution was different; the incentive structure was different; and the environmental profile was categorically different, a fact that became central to Ethereum's public narrative in 2021–2022. Facts • Genesis: December 1 2020, 12:00:23 UTC • Minimum threshold: 524,288 ETH / 16,384 validators; actual launch: ~21,063 validators • Deposit contract: 0x00000000219ab540356cBB839Cbe05303d7705Fa • Initial staking APR: ~22%; normalized to 4–5% as validator set grew • Beacon Chain ran 21 months in parallel before The Merge (September 2022) • Withdrawals not enabled until Shapella, April 2023 — over two years after genesis Primary Documents • EF Blog: The Beacon Chain has launched (December 1 2020) — https://blog.ethereum.org/2020/12/01/eth2-quick-update-no-21 • Beacon Chain genesis on beaconcha.in — https://beaconcha.in/slot/0