Argentine cryptographer and blockchain researcher who conducted the most significant blockchain forensic analysis in Bitcoin's history — the 'Patoshi' analysis. His work identified a single dominant miner in Bitcoin's earliest blocks, attributed to Satoshi Nakamoto, who accumulated approximately 1.1 million BTC and never spent them.
Sergio Demian Lerner is an Argentine cryptographer and blockchain researcher. He publishes his research on his blog Bitslog (bitslog.com) and is known for conducting the most important blockchain forensic analysis in Bitcoin’s history.
First Patoshi Analysis (April 2013): On April 17, 2013, Lerner published “The Well Deserved Fortune of Satoshi Nakamoto” — the first systematic analysis of Bitcoin’s earliest mining patterns. By tracking the ExtraNonce field in coinbase transactions 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.
Nonce LSB Discovery (September 2013): Five 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.
“Patoshi” Naming (April 2019): 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.
The Mining Machine (August 2020): 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.
Significance: Lerner’s research established that Satoshi Nakamoto accumulated roughly 5% of Bitcoin’s total 21 million supply — and chose never to spend it. 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.
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Bitcoin researcher Sergio Demian Lerner published 'The Well Deserved Fortune of Satoshi Nakamoto,' identifying a distinctive mining pattern (later named 'Patoshi') in Bitcoin's earliest blocks. The analysis linked approximately 22,000 blocks (~1.1 million BTC) to a single miner presumed to be Satoshi Nakamoto. Virtually none of these coins have ever been spent.
Five months after his initial ExtraNonce analysis, Lerner discovered that Satoshi's nonce values had a highly non-random least significant byte (LSB) distribution — restricted to values [0..9] and [19..58], approximately 50 out of 256 possible values. This second fingerprint, independent of ExtraNonce, proved Satoshi used custom mining software with parallelized nonce space partitioning.
Six years after his original analysis, Lerner published 'The Return of the Deniers and the Revenge of Patoshi,' coining the term 'Patoshi' (Pattern + Satoshi), updating his estimate to ~22,000 blocks / ~1.1 million BTC, and providing new evidence: zero timestamp inversions between Patoshi blocks versus 224 among non-Patoshi blocks, proving a single PC clock.
Blockchain tracking service Whale Alert published an independent analysis confirming Satoshi mined 1,125,150 BTC across 22,503 of the first 54,316 blocks. The report found Satoshi maintained approximately 60% hashrate using ~48 computers, deliberately throttling to protect the network rather than maximize profit.
Multiple blockchain analyses estimate that Satoshi Nakamoto mined approximately 1.1 million bitcoins in Bitcoin's earliest days, with none of these coins having ever been spent.
Reykjavik University researchers publish the first peer-reviewed academic study of the Patoshi pattern in PLOS ONE. The paper identifies two distinct nonce anomalies — the 'P anomaly' (extended Patoshi) and the 'Z anomaly' (zerononce) — and crucially finds that the P anomaly appears in ALL of the first 64 blocks mined, including Block 12 which was previously classified as non-Patoshi by ExtraNonce analysis.
Bitcoin researcher Jameson Lopp demonstrates that Satoshi deliberately throttled mining capacity, earning only ~1.1 million BTC when full-capacity mining could have yielded ~2.19 million BTC. Lopp concludes: 'Anyone who claims that Satoshi was greedy simply hasn't done the math.'