Gavin Andresen

Gavin Andresen is a software developer, born in Melbourne, Australia in 1966 and raised in Seattle. He studied computer science at Princeton University, graduating in 1988, and spent his early career in 3D graphics software, including work on the specification for the Virtual Reality Modeling Language, before moving through a series of startups.

He encountered Bitcoin in 2010 and became one of its most active contributors within months. One of his first projects was the Bitcoin Faucet, a website that gave away small amounts of bitcoin to anyone who asked, built to get the currency into the hands of people who wanted to try it at a point when there was almost no other way to obtain any.

As Satoshi Nakamoto withdrew from public participation in late 2010 and 2011, responsibility for the reference software passed to him, along with the alert key used to broadcast emergency messages to the network. He became the lead maintainer of what is now called Bitcoin Core, and in 2012 was a founding member and chief scientist of the Bitcoin Foundation. He handed the lead maintainer role to Wladimir van der Laan in 2014.

He was a prominent advocate for raising Bitcoin's block size limit to allow more transactions per block, and co-developed the alternative implementation Bitcoin XT with Mike Hearn in 2015, later supporting Bitcoin Classic. Neither proposal was adopted by the majority of the network, and the block size debate was resolved in favour of keeping the base protocol conservative.

In May 2016 he published a post stating that he was convinced Craig Wright was Satoshi Nakamoto, following a private demonstration. The claim was disputed by other developers and by cryptographers who examined the published evidence, his commit access to the Bitcoin Core repository was revoked shortly afterwards, and he later wrote that he regretted becoming involved. In 2024 the High Court of England and Wales ruled that Craig Wright is not Satoshi Nakamoto.

Andresen treated Bitcoin primarily as a payment system that needed to work at scale, which is the reading the white paper's own title supports and the source of most of his positions. His argument in the block size debate was that a network which cannot process transactions cheaply loses the use case it was built for, and that the limit was a temporary anti-spam measure rather than a permanent design choice.

The counter-argument, which prevailed, was that raising the limit increases the cost of running a full node, and that a network where fewer participants can independently verify the rules is a weaker one regardless of its throughput. The disagreement was genuine and technical on both sides, and it is the clearest illustration available that open-source money has no authority able to settle such a question by decision.

The handover of the reference software is the moment Bitcoin stopped depending on its original author, and it is a large part of why the project survived that author's disappearance. It is also the clearest demonstration that a decentralised system still relies on named people doing maintenance work.

The block size debate he helped drive established, by working through it, that no participant in Bitcoin can change the rules by decision. That precedent shapes how every subsequent proposal has been argued.