Part 4: Upgrades

Upgrade History

Phase 0

For historical reasons, the initial configuration of the beacon chain at its genesis was called Phase 0.

Beacon chain genesis took place at 12:00:23 UTC on the 1st of December 2020. The extra 23 seconds comes from the timestamp of the first Eth1 block to meet the genesis criteria, block 11320899. It is a little remnant of proof of work forever embedded in the beacon chain's history.

MIN_GENESIS_TIME uint64(1606824000) (Dec 1, 2020, 12pm UTC)
GENESIS_FORK_VERSION Version('0x00000000')

See the Phase 0 specs for the full description. These specs still apply to the beacon chain today, except where they were superseded by the Altair or Bellatrix upgrades.

Created by Ben Edgington. Licensed under CC BY-SA 4.0. Published 2023-07-01 13:14 UTC. Commit d859d30.