In unserer neuen Folge sprechen wir mit Fabian Jahr über die Bitcoin Core Entwicklung: ▪️ Wie sieht die Arbeit eines Bitcoin Core Entwicklers aus? ▪️ Wie wird #Bitcoin weiterentwickelt & wie werden Fehler vermieden? ▪️ Welche Verantwortung lastet auf den Bitcoin Core Entwicklern?

Brink renews our financial support for all of our 8 Bitcoin Core engineers through 2025! Thank you to Michael Ford gloria Hennadii Stepanov Sebastian 🟩🥕 Niklas Gögge @stphnvlstk Fabian Jahr and marco león for your amazing work on Bitcoin and we are proud to support you. 🙏

NEW: Fabian Jahr's long-awaited research into Cross-Input Signature Aggregation This is an extremely detailed and well-written exploration of CISA as a potential next step in Bitcoin development CISA's incentive alignment between privacy and cost-savings is mind-blowing

Here is one simple thing you can do that would be very helpful to test the Bitcoin Core release candidate. At home, start bitcoind with the -natpmp option. Let it start and stop it. Check if it could successfully open a port on your router. You can check this by looking at the

Thanks a lot to Human Rights Foundation (HRF) for supporting my work and initiating this report. I hope it helps people understand the potential that a CISA softfork could bring to Bitcoin and why we are excited about it.

We are excited to announce that Eugene Siegel has joined Brink as an open source engineer working on fuzz testing and Bitcoin Core development!

After years of contributing to Bitcoin nights and weekends, Sebastian Falbesoner (Sebastian 🟩🥕) has left his job to focus 100% of his time on Bitcoin open source development.

*Before* using Bitcoin Core, don’t forget these two steps after downloading: 1. Verify the downloaded files. 2. Run `test_bitcoin` or `test_bitcoin.exe` on *your* machine.

Announcing DahLIAS! 🎉 The first crypto protocol for full cross-input signature aggregation that allows reusing Bitcoin's curve secp256k1. ✅ 64B sigs ✅ Verify is ~2x faster than half-agg'd Schnorr sigs ✅ 2-round signing Kudos to the team: Tim Ruffing Yannick Seurin! 👇

Running DahLIAS (and secp256k1lab) 😎 github.com/fjahr/cisa-pla…

Bitcoin Core developer Fabian Jahr discusses Cross-Input Signature Aggregation (CISA), a proposed Bitcoin upgrade that could lower the cost of privacy-protecting collaborative transactions, benefitting activists, nonprofits, and businesses. Read the report: hrf.org/cisa

A statement on Bitcoin Core development and transaction relay policy - bitcoincore.org/en/2025/06/06/…

🔥 Our jedi Master General Kenobi is connecting through holo-comm to the BerlinBitDevs happening today! Join in to hear some real talk about SLICE, decentralization, and what it means to build the first fully Stratum V2 Bitcoin mining pool.

Excited to share "Provable Cryptography for Bitcoin: An Introduction" - a comprehensive workbook that teaches formal security definitions and proofs through hands-on exercises. Solutions included!

In the fourth episode of the Privacy Series, filmed at bitcoin++ in Riga earlier this year, I sit down with Fabian Jahr to discuss Cross Input Signature Aggregation, where one signature can validate spending multiple inputs, and its implications on Bitcoin Privacy.