# 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`](./mainnet.yaml) for a complete example.