New Core Maintainer: Sebastian Kung
THE NEWS
On January 8, 2026, developer Sebastian Kung (TheCharlatan / sedited) was added as the 6th maintainer with commit access to Bitcoin Core's master branch. Nominated by Gloria Zhao.
ABOUT HIM
South African. Major in computer science and minor in physics from the University of Zurich. "I like greyhounds, bitcoin, food, reproducible builds and the guix linux distribution." Contributing to Bitcoin Core since ~2018.
FUNDED BY
Spiral (Block/Square's Bitcoin development arm) and MIT DCI (Digital Currency Initiative).
His Key Project: libbitcoinkernel
WHAT IS IT?
libbitcoinkernel is a project to extract Bitcoin Core's consensus validation engine into a standalone library. The goal is to cleanly separate the consensus logic — everything needed to determine whether a block extends the best-work chain — from everything else in Bitcoin Core.
WHY IT MATTERS
Right now, Bitcoin's consensus rules are deeply entangled with networking, wallet, GUI, and RPC code. If you want to build an alternative Bitcoin implementation (e.g. in Rust), you either rewrite consensus from scratch (risking bugs and forks) or you link against all of Bitcoin Core. libbitcoinkernel gives you just the consensus part — validated, battle-tested, reusable.
IMPACT
Enables multiple Bitcoin implementations that share the same consensus engine. Reduces the risk of consensus splits. Makes the codebase more modular, testable, and maintainable. Sebastian has been the main driving force behind this effort for the past several years.
Current Bitcoin Core Maintainers
| MAINTAINER | GITHUB | ADDED | FOCUS | NATIONALITY |
|---|---|---|---|---|
| fanquake | fanquake | 2019 | Build, Security | 🇦🇺 Australian |
| Hennadii Stepanov | hebasto | 2021 | GUI, CMake | 🇺🇦 Ukrainian |
| Ava Chow | achow101 | 2021 | Wallet, HWI | 🇺🇸 American |
| Gloria Zhao | glozow | 2022 | Mempool, P2P | 🇺🇸 American |
| Ryan Ofsky | ryanofsky | 2023 | Multiprocess/IPC | 🇺🇸 American |
| Sebastian Kung | TheCharlatan | 2026 | Kernel, Validation | 🇿🇦 South African |
HISTORY
The trusted-keys file in the Bitcoin Core repo tracks all maintainer additions and removals over time. Maintainers have merge commit access but consensus changes still require broad review and agreement from the wider contributor base.