Jimmy Song: The Man Who Teaches Bitcoin From Scratch

Who is Jimmy Song, and why does a Texas site cover him?

Because the state's Bitcoin story has two layers, and the people pages so far cover only one. The statutes, the reserve, and the mines are told in the history of Bitcoin in Texas; underneath them is the question of who in Texas actually knows how the thing works, and who taught them. Song is the answer more often than anyone. Born in Korea, in the United States from age seven, a University of Michigan mathematician writing software since 1998, he found Bitcoin in 2011 and by 2013 was contributing to its open-source tooling.^[1][2][3] His résumé is infrastructure: engineering lead at the Armory cold-storage wallet, Bitcoin integration at Monetas in 2014, Principal Architect at the institutional platform Paxos, then a venture-partner seat at Blockchain Capital from January 2018.^[2][12] He works from Austin, and the city's builder scene – chronicled in the Texas crypto archive and anchored by the Satoshi Nakamoto Institute – is where his classroom and his arguments both happen.^[2][20]

What did Jimmy Song build for the Bitcoin network?

A way in. The single most-cited artifact is Programming Bitcoin, published by O'Reilly on March 26, 2019: a book that refuses to explain Bitcoin and instead makes the reader build it – finite fields, elliptic-curve signatures, transaction parsing and signing, Script, block validation, proof-of-work, and the peer-to-peer network, in Python, from nothing.^[6] Its repository, started December 17, 2017, sits at roughly 1,900 stars and 700 forks, and the book itself is the written form of a two-day seminar Song had already run for more than 500 developers.^[5][11] Then the university: in early 2019 he taught “Programming Blockchain” as a seven-week graduate course at UT Austin's McCombs School of Business, for business and computer-science master's students – the state's flagship university teaching engineers to build the protocol, from a working developer rather than a survey lecturer.^[7][8] The point of all of it is the same: the number of people who can read a Bitcoin transaction at the byte level is the network's real security budget, and Song has done more to grow it than any other single teacher.

The code record is smaller and worth stating precisely, because conference bios round it up. Fourteen commits authored by Song merged into Bitcoin Core between April 17 and June 3, 2017 – unit tests for address management and amount handling, RPC tests for getnetworkhashps, getdifficulty, gettxout, getchaintxstats, and the like.^[4] No consensus code, no protocol proposals. That is a contributor, not an architect – and it makes the classroom, not the commit log, the real instrument of his influence.

What did Song argue, and which fights did he pick?

The block-size war first. Through 2017, as the network split over SegWit, UASF, and the Segwit2x hard fork, Song's Medium essays on game theory, block weight, and fork scenarios became standard reading on the small-block side that won.^[10] The day SegWit activated, he published “Why I Was Wrong About Segwit And Big Blocks,” grading his own pinned New Year's prediction “2/3 wrong” – a habit of public self-correction rare in the genre.^[9] Then the wager: onstage at Consensus 2018 he bet ConsenSys founder Joe Lubin that decentralized apps would never find real users; the finalized terms, a year later, put 810.8 ETH against 69.74 BTC on whether five dapps could hold 10,000 daily and 100,000 monthly users for six months before May 23, 2023.^[13] Then the books that carry the argument outward: The Little Bitcoin Book, written with seven co-authors in days in August 2019; Thank God for Bitcoin, the Christian case for sound money, in November 2020; Bitcoin and the American Dream, written for legislators with the Bitcoin Policy Group in December 2021 – the same season Texas was writing its first digital-asset statutes; and Fiat Ruins Everything in September 2023.^{[15][16][17][18]}

The Texas stage came in October 2021, when Song shared the Texas Blockchain Summit platform with Senator Ted Cruz and asked him when Peter Thiel first told him about Bitcoin – a moment told from the senator's side on Ted Cruz and Bitcoin.^[19] When Consensus itself moved to Austin in June 2022, Song's newsletter drew the line on home turf: “Austin is turning into altcoin scammer central for a week, so I'm here to help by helping you navigate the place.”^[20]

The honest counterweight: the maximalist's ledger

The criticism worth engaging is not that Song is wrong about Bitcoin – this site shares the thesis – but that the certainty has a cost, and the record shows where. The Lubin wager is the cleanest case: at the May 2023 deadline, two blockchain-data firms counted exactly five dapps that met the usage bar – the bare minimum for Lubin to win – while whether those five were “decentralized” under the terms stayed contested, and no public settlement followed.^[14] A bet designed to prove a point ended as a definitional argument. The Blockchain Capital seat cuts the same way: a Bitcoin-only voice drawing a venture partner's chair at a fund that invests across the industry he calls scams.^[12] And the “Core developer” billing – repeated by podcasts, summits, and speaker bureaus – outruns fourteen test commits from one spring.^[4]

The fair reading is that none of this touches the work that matters. The essays that were wrong were graded wrong in public by their author. The wager, whatever its outcome, was the rare crypto argument with skin in the game. And the teaching is not a claim at all: it is a textbook in print, a course on a UT syllabus, and several hundred engineers who can build a transaction by hand because a man in Austin made them do it. The Texas legislature can write a reserve into law, as the reserve reference records; it cannot write the engineers. Song's influence on the network is that he did.

Where does the Song record stand today?

As of September 2026: five books, a standing seminar, a UT course on the record, a podcast and newsletter still running, and a home address in the city where the industry now holds its largest conference.^[1][20] The officeholders who shaped Texas's Bitcoin law are on Greg Abbott and Bitcoin, Dan Patrick and Bitcoin, and Don Huffines and Bitcoin. This page opens the other wing: the Texans who shaped the network itself.