eth2.0-specs/configs/fork_timelines/README.md

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# Fork timelines
This directory contains a set of fork timelines used for testing, testnets, and mainnet.
A timeline file contains all the forks known for its target.
Later forks can be ignored, e.g. ignore fork `phase1` as a client that only supports phase 0 currently.
## Format
Each preset is a key-value mapping.
**Key**: an `lower_snake_case` (a.k.a. "python case") formatted string, name of the fork.
**Value**: an unsigned integer number, epoch number of activation of the fork
Timelines may contain comments to describe the values.
See `mainnet.yaml` for a complete example.