Marco De Leon (@macrohead7) completed his transition from Brink fellow to full-time grantee, establishing himself as a capable contributor across multiple areas of the codebase. He drove the txid type safety project to completion across six pull requests, successfully removed Bitcoin Core's legacy checkpoints, left nearly 250 review comments, and contributed to fuzz testing infrastructure and P2P code review.

You can view all of his PRs here: https://github.com/bitcoinbrink/website/blob/master/assets/files/2026-03-26-engineering-impact-report-2025/marcofleon_2025.md

And review comments: https://github.com/bitcoinbrink/website/blob/master/assets/files/2026-03-26-engineering-impact-report-2025/marcofleon_2025_review_comments.csv

More from Bitcoin Core developers funded by Brink:
https://brink.dev/blog/2026/03/26/engineering-impact-report-2025/