Blockchain researcher who discovered the Patoshi mining pattern
On April 17, 2013, Argentine cryptographer Sergio Demian Lerner published “The Well Deserved Fortune of Satoshi Nakamoto” on his blog Bitslog. By tracking the ExtraNonce field across the first 36,288 blocks, he identified a single entity that had mined approximately 1 million BTC in Bitcoin’s first year. Virtually none of these coins had ever been spent.
About four and a half months later, he found a second fingerprint in the same miner’s nonce values; in 2019 he named the pattern “Patoshi” and refined the count to about 22,000 blocks and 1.1 million BTC; in 2020 he reconstructed the machine — a single high-end CPU running 5 nonce-space-partitioned threads, appearing roughly 4.3× faster than any other early miner.
Lerner’s analysis is the most important blockchain forensic work in Bitcoin’s history. It established that Satoshi Nakamoto accumulated roughly 5% of Bitcoin’s 21-million supply, on one machine, and left almost all of it unspent.
Lerner was born in Argentina in 1972 and studied electrical engineering at the Universidad Nacional de La Plata before moving into information-security research.
The 2013 analysis was the first systematic analysis of Bitcoin’s earliest mining patterns, built on ExtraNonce values in coinbase transactions.
About four and a half months later, Lerner discovered a second, independent fingerprint. The least significant byte (LSB) of nonce values in the dominant miner’s blocks was restricted to approximately 50 out of 256 possible values — a pattern consistent with custom mining software that partitioned the nonce search space across parallel threads. This proved the miner used modified software, not the standard Bitcoin client.
In “The Return of the Deniers and the Revenge of Patoshi,” Lerner coined the term “Patoshi” — a portmanteau of “Pattern” and “Satoshi” — which became the standard reference in all subsequent research. He updated his estimate to approximately 22,000 blocks and 1.1 million BTC.
His timestamp inversion analysis provided near-mathematical proof: zero inversions between consecutive Patoshi blocks versus 224 among non-Patoshi blocks, proving the use of a single PC clock.
Lerner concluded that the Patoshi miner used a single high-end CPU with multi-threading — not 50+ networked computers. The nonce space was divided into 5 subranges scanned by parallel threads, with likely SSE2 optimizations. The machine appeared approximately 4.3 times faster than any other early miner.
Lerner’s research established that Satoshi Nakamoto accumulated roughly 5% of Bitcoin’s total 21 million supply — and left almost all of it unspent. This finding has profound implications for Bitcoin’s economics, Satoshi’s motivations, and the interpretation of early Bitcoin history. His work has been independently verified and extended by multiple researchers: Whale Alert’s 2020 analysis largely corroborated his figures, Jameson Lopp’s 2022 study built directly on his block count and BTC estimate to model foregone mining reward, analysts ruling out Satoshi as the source of a 2023 dormant-coin movement applied his nonce-pattern methodology as the forensic signature, and Galaxy Digital’s classification of the addresses named in a 2026 lost-property lawsuit used the same Patoshi signature to identify roughly 1.096 million BTC as Satoshi’s.
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American Bitcoin infrastructure engineer. Built Statoshi node telemetry (2014), co-founded Casa (2016), was SWATted at his home in 2017, and wrote "Who Controls Bitcoin Core?" (2018).
Lerner published The Patoshi Mining Machine, using re-mining simulation to prove Satoshi mined on a single high-end CPU with 5 parallel threads — refuting the Whale Alert claim.
Reykjavik University researchers published the first peer-reviewed PLOS ONE study of the Patoshi pattern, identifying two nonce anomalies (P and Z) and finding the P anomaly in all 64 first blocks.
Four and a half months after his ExtraNonce analysis, Lerner found Satoshi's nonce values had a non-random LSB distribution — a second fingerprint of custom mining software with nonce partitioning.
Six years after his original analysis, Lerner published The Return of the Deniers and the Revenge of Patoshi, coining the term Patoshi and proving a single PC clock via timestamp-inversion evidence.
Whale Alert independent analysis confirmed Satoshi mined 1,125,150 BTC across 22,503 of the first 54,316 blocks, claiming ~48 computers (later disputed by Lerner's single-PC simulation).
Jameson Lopp shows Satoshi deliberately throttled mining capacity, earning ~1.1M BTC when full capacity could have yielded ~2.19M BTC. Anyone claiming Satoshi was greedy hasn't done the math.
Sergio Demian Lerner published The Well Deserved Fortune of Satoshi, identifying a distinctive mining pattern (later named Patoshi) linking ~22,000 blocks (~1.1M BTC) to a single miner.
Multiple blockchain analyses estimate that Satoshi Nakamoto mined approximately 1.1 million bitcoins in Bitcoin's earliest days, with the vast majority of these coins never having been spent.