Domènec Madrid
I’m Domènec, a Computer Science Engineer graduated from the Autonomous University of Barcelona. Later on, I completed a Master’s degree in Cybersecurity and Privacy at Universitat Oberta de Catalunya.
I’m about to start my PhD at UAB, continuing a research path that I’ve been shaping over the past years there. In parallel, I teach lab sessions for the Computer Networks course in the Computer Science degree, and I’m currently supervising four Bachelor’s Thesis.
My deep interest in cryptography, privacy, and distributed systems naturally led me into the world of Bitcoin. I’ve worked on projects ranging from building a parallel Bitcoin mainnet environment in Docker for realistic testing, to hardware‑wallet fingerprinting, to analyzing anti‑exfiltration protocols and other privacy‑oriented mechanisms. This summer I’ve been contributing to BDK through Summer of Bitcoin.
If you’re curious about any of this, you can explore some of my recent work in my blog :)
Outside the academic and technical bubble, I’m usually out hiking with my dog. I like staying in constant learning mode, so if you ever want to reach out or comment on something, don’t hesitate to contact me!.
news
| Aug 24, 2026 | Wrapped up my Summer of Bitcoin project on bdk_wallet 🧡. Four pull requests across bdk_chain and bdk_wallet, all still under review, teaching the wallet to decide which unconfirmed coins to trust by following where the money came from instead of which keychain it landed on. The whole story is in Modifying the bdk_wallet Balance API for My Summer of Bitcoin Project. |
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| Aug 16, 2026 | Counted every ECDSA signature ever mined to work out what low-r grinding has actually saved 🧮. Written up in What Grinding Has Actually Saved on Chain. |
| Aug 14, 2026 | Accepted into Summer of Bitcoin ☀️, working on the balance API of bdk_wallet. I wrote about it in Modifying the bdk_wallet Balance API for My Summer of Bitcoin Project. |
| Apr 21, 2026 | Currently deep into hardware wallet fingerprinting research 🔍. If you’re curious about what it means for Bitcoin privacy, check out my latest blog post. |
| Mar 22, 2026 | Presented our paper Is Hardware Wallet Fingerprinting Even Possible? at RECSI 2026 in Tenerife 🌋. |
latest posts
| Aug 16, 2026 | What Grinding Has Actually Saved on Chain |
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| Aug 14, 2026 | Modifying the bdk_wallet Balance API for My Summer of Bitcoin Project |
| Apr 01, 2026 | Is Hardware Wallet Fingerprinting Even Possible? |