Bitcoin Pizza Day pioneer and first GPU miner
Laszlo Hanyecz is a software developer based in Jacksonville, Florida, who made several foundational contributions to Bitcoin’s early development. He corresponded directly with Satoshi Nakamoto on technical matters and is best known for the first real-world commercial Bitcoin transaction.
In early 2010, Hanyecz ported the Bitcoin client to macOS, making the software available on Apple’s platform for the first time. He communicated with Satoshi Nakamoto about the port, and their correspondence reveals Satoshi’s guidance on cross-platform compatibility and mining architecture.
Hanyecz was the first person known to have successfully used a GPU (graphics processing unit) to mine Bitcoin, dramatically increasing mining efficiency compared to CPU-only mining. He discussed this development directly with Satoshi, who expressed concern about an “arms race” in mining hardware, preferring that mining remain accessible to ordinary computers for as long as possible.
On May 18, 2010, Hanyecz posted on the BitcoinTalk forum offering 10,000 BTC for two large pizzas. On May 22, 2010, a user named jercos (Jeremy Sturdivant) accepted the offer, ordering two Papa John’s pizzas delivered to Hanyecz’s home. This is recognized as the first known real-world commercial transaction using Bitcoin. The date is now celebrated annually as “Bitcoin Pizza Day.” At the time, the 10,000 BTC was worth approximately $41; at Bitcoin’s peak valuations, the same amount would be worth hundreds of millions of dollars.
In February 2018, Hanyecz made another symbolic pizza purchase — this time using the Lightning Network, Bitcoin’s layer-2 scaling solution. He has stated publicly that he has no regrets about the original pizza transaction, viewing it as an important milestone in demonstrating that Bitcoin could function as a medium of exchange.
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Complete record of all four developers who had commit access to Bitcoin's SourceForge SVN repository. 252 revisions were recorded from August 30, 2009 to September 13, 2011.
Hanyecz recalls his Satoshi correspondence around the April 19, 2010 macOS port. The private emails are unreleased; quotes are from later interviews. He called Satoshi paranoid, bossy, and weird.
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Hanyecz recalls Satoshi's private pushback on his May 10, 2010 BitcoinTalk GPU-mining announcement. The verifiable element is the announcement; Satoshi's side comes from Hanyecz's later interviews.
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Hanyecz recalls Satoshi reciprocating his GPU miner code by sharing his own GPU mining code, kept as defense against potential 51% attacks rather than for mining. From later interviews.
Laszlo Hanyecz posts his famous offer to pay 10,000 bitcoins for two pizzas, leading to the first known real-world Bitcoin transaction on May 22, 2010 — now celebrated as Bitcoin Pizza Day.
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Laszlo Hanyecz pays 10,000 BTC for two Papa John's pizzas — the first purchase of a physical good with Bitcoin. Completed May 22, 2010 and celebrated annually as Bitcoin Pizza Day. ~$41 at the time.
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Benjamin Wallace's Wired feature — an early major mainstream article on Bitcoin. Traces the whitepaper, mining boom, Mt. Gox hack, and growing pains, ending with Garzik's "We really don't care."