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.
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.