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Become a sponsor to Fabian Jahr

Hi! I am Fabian and I am an independent contributor to Bitcoin Core.

I spend most of my time reviewing and testing pull requests and digging into any parts where I find potential bugs to be fixed or improvements to be made. My biggest contribution that is currently in progress, is the coinstatsindex. It makes auditing the coin supply for potential unwanted inflation much easier and efficient.

Aside from contributing to Bitcoin Core, I hack on smaller projects (example Lightning Vending Machine) and I spread technical knowledge of bitcoin through Bitcoin Socratic Seminars. I organize and co-host the Berlin Socratic Seminar on a monthly basis and I have hosted seminars in Ho Chi Minh City and Frankfurt (Main) as well.

If you would prefer to send me sound money instead you can find a BTCPayServer donation button on my website by clicking on the menu button: (JS needs to be enabled).

Thanks for checking out my profile!

Current sponsors 7

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Past sponsors 8

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Featured work

  1. bitcoin/bitcoin

    Bitcoin Core integration/staging tree

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Choose a custom amount

$5 a month


Buy me lunch on a cheap day. I can get a decent sandwich for that around where I live.

$10 a month


Buy me lunch in a decent restaurant where I can sit down and have a chat with someone.

$20 a month


Buy me some drinks. I don't go out too often, but when I do it's usually for a bitcoin meetup.

$50 a month


Buy me transportation or connectivity. I can get everywhere comfortably with public transport and this buys me a monthly ticket. My internet bill comes out to the same amount as well and that is kind of important too.

$80 a month


Pay for my monthly gym membership. Working out helps me relieve stress and stay healthy.

$120 a month


Pay my server and software costs. I run a few cloud servers for testing different things and also use some paid tools for development. My monthly costs come out to roughly this amount.

$250 a month


Pay for the monthly Bitcoin Socratic Seminar. If I would have to charge for hosting the socratic seminar, this would probably be my rate.