This repository is a curated, version-controlled taxonomy of cryptocurrency and blockchain ecosystems and their associated GitHub repositories. It is the dataset behind Electric Capital's developer activity reports. The primary artifact is a large collection of timestamped migration files (a custom DSL using commands like `repadd`, `ecoadd`, `ecocon`) that incrementally build a graph mapping ecosystems to repositories with tags. The dataset spans over a decade (2014–2026) and includes hundreds of thousands of repository entries across dozens of ecosystems, from major chains (Ethereum, Bitcoin, Stellar) to niche projects and hackathon submissions. The repository also provides a Python CLI tool (`open-dev-data`) for validating migrations, exporting the taxonomy as JSON Lines or Parquet, downloading the full dataset with resumable transfers and integrity checks, and exploring it locally via DuckDB and an interactive TUI (Harlequin). The codebase is well-structured, with clean abstractions for the data model, timestamp handling, and shell-like command parsing. However, the dataset itself suffers from significant noise—many entries are student hackathon repos, boilerplate forks, or duplicate URLs—which dilutes its signal for research. The curation is manual and not automatically deduplicated. Despite this, the taxonomy and tooling are highly reusable for any domain needing a version-controlled, hierarchically categorized registry of external projects.