Google engineer who became an early Bitcoin contributor and corresponded with Satoshi
Mike Hearn is a software engineer who worked at Google on projects including Google Maps, Google Earth, and Gmail’s anti-spam systems. He became one of the earliest contributors to Bitcoin after reading the white paper and contacting Satoshi Nakamoto directly.
In April 2009, just months after Bitcoin’s launch, Hearn emailed Satoshi Nakamoto after reading the Bitcoin white paper. This began a correspondence that would continue through April 2011. Hearn was among the very first people outside the initial cypherpunk circle to take a serious technical interest in Bitcoin.
Between 2009 and April 2011, Hearn and Satoshi exchanged a series of emails covering Bitcoin’s technical future. Satoshi discussed how the system could scale, how simplified payment verification (SPV) clients would work, and how he envisioned the evolution of mining from CPUs to specialized hardware. In one of the final exchanges (April 23, 2011), Satoshi wrote:
“I’ve moved on to other things. It’s in good hands with Gavin and everyone.”
This was among the last known private communications from Satoshi.
Hearn developed BitcoinJ, a Java implementation of the Bitcoin protocol. It was the first major alternative implementation and became widely used in Android Bitcoin wallets and other applications. BitcoinJ demonstrated that Bitcoin could be implemented independently from the original C++ client.
In August 2017, Hearn’s email correspondence with Satoshi was made public. The emails were first shared on BitcoinTalk and subsequently published on Hearn’s personal website. These emails became one of the most important primary sources for understanding Satoshi’s long-term technical vision and his state of mind as he left the project.
On January 14, 2016, Hearn published a blog post titled “The resolution of the Bitcoin experiment” on Medium, in which he wrote that Bitcoin “has failed.” He announced he was leaving the project and had sold all his bitcoins, citing governance issues and the inability to reach consensus on scaling solutions. He subsequently joined R3, a blockchain consortium focused on enterprise applications, where he co-led development of the Corda distributed ledger platform.
17 entries
Genealogy of every Bitcoin protocol fork that left a separate chain alive (Bitcoin Cash, SV, Gold) and the adjacent cryptocurrencies derived from Bitcoin (Namecoin, Litecoin, Dogecoin).
Mike Hearn contacts Satoshi Nakamoto for the first time with questions about Bitcoin's scalability, mining hardware, inflation schedule, and coin denominations.
Mike Hearn asks Satoshi whether the Electronic Funds Transfer Act could apply to Bitcoin and if the inability to do chargebacks risks making it illegal.
Mike Hearn asks about the origin of the 21 million coin limit, the 10-minute block target, and the 500KB block size limit while working on a Java SPV implementation for Android.
Mike Hearn announces the open-source release of BitcoinJ under the Apache 2 license, and asks about merkle branch verification, scripting language ideas, and why transaction replacement was disabled.
Mike Hearn describes his work on Google's abuse team and proposes using Bitcoin as collateral against accounts for spam prevention, asking about time-locking coins.
Mike Hearn's private email correspondence with Satoshi Nakamoto, in which Satoshi stated he had 'moved on to other things' and that Bitcoin was 'in good hands with Gavin and everyone.'
Satoshi's final known private messages: April 23, 2011 to Mike Hearn — "in good hands with Gavin." April 26 to Andresen, transferring the alert key and saying he would probably be unavailable.
The hypothesis that Len Sassaman (cypherpunk cryptographer, died July 3, 2011) was Satoshi. Frame: timing argument and cypherpunk credentials. Counter: no direct documentary link, no widow comment.
Editorial reading of how the 2014 'Bitcoin Core' rebrand reshaped Bitcoin's authority vocabulary — PR #3408 internal disagreement, the 2015-2017 fork episodes, and Hearn's 2025 retrospective regret.
Why Bitcoin's 2015-2017 fork wars ran as identity contests, not OSS disputes: the post-2011 authority vacuum, the economic weight on rule choices, and the three layers that bound code to currency.
Mike Hearn and Gavin Andresen released Bitcoin XT 0.11A, a Bitcoin Core fork implementing BIP 101 — 8 MB blocks doubling every two years. The launch opened the public phase of the block-size war.
Mike Hearn published The Resolution of the Bitcoin Experiment, declaring Bitcoin had failed due to governance breakdown and the block-size stalemate. He sold all his coins and left the project.
Mike Hearn publishes his private email correspondence with Satoshi Nakamoto, providing valuable insights into Satoshi's thinking about Bitcoin's technical future.
Jameson Lopp argues Hal Finney could not have been Satoshi: on April 18, 2009, Finney was running a 10-mile race in Santa Barbara during a window of Satoshi network activity.
Mike Hearn testifies at the COPA v Wright trial, recounting his direct interactions with Satoshi and describing how Wright failed his technical check questions at a 2016 dinner.
In a CoinGeek interview, Mike Hearn offers rare reflections on Satoshi's personality — observing he enjoyed experimenting but appeared to grow frustrated when evangelical personalities arrived.