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 These specs still apply to the beacon chain today, except where they were superseded by the Altair, Bellatrix, or later upgrades.

My Phase 0 annotated specification remains available.

Created by Ben Edgington. Licensed under CC BY-SA 4.0. Published 2023-05-31 13:58 UTC. Commit 6d6b575.