- What Bitcoin and "blockchain" really are — and why there's no coin anywhere
- Keys and signatures, and why your money can't be forged or guessed
- Mining, and why no one can ever make more than 21 million
- How to buy your first bitcoin on an exchange — without getting burned
- Wallets, and the twelve ordinary words that hold (or lose) everything
- How to spot the scams built to take it from you
Twenty One Million
The Inner Workings of Blockchain and Bitcoin
Four colleagues. One whiteboard. Ten Thursdays to understand the thing everyone argues about, and almost no one can explain.
Margaret has been handed a single page to fill out: a recommendation, by quarter-end, on whether her insurance company should invest in Bitcoin. She means to write *NO* and be home by five. But to write *NO* with a clear conscience, she first has to understand it - and that turns out to take longer than an afternoon.
What follows is the clearest explanation of Bitcoin ever told as a story. No hype. No jargon. No get-rich pitch - just four sharp, skeptical adults breaking the thing open one piece at a time, from *there is no coin* to the twelve words that can hold a fortune, discovering that the machine they were sent to dismiss is harder to cheat than the bank.
If you've ever nodded along to the word *blockchain* and quietly prayed no one would
ask you what it meant - this is the book that finally makes it make sense.
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About
About the Book
Everyone has an opinion about Bitcoin. Almost no one can explain it.
A novel you can finish on a long flight — and step off the plane finally understanding how Blockchain actually works.
*Twenty-One Million* fixes that - not with a lecture, but with a story. Four colleagues at a staid insurance company are handed a thankless assignment: decide, in one page, whether the firm should touch Blockchain and Bitcoin. Margaret, who runs risk and trusts no one with money after being burned once, fully intends to write *no*. To do it honestly, she has to understand the thing first -- and so, one Thursday at a time, in the worst conference room in the building, she and three equally skeptical colleagues take Bitcoin apart on a whiteboard and try to break every piece.
They start where everyone's confusion starts ("what *is* a coin?") and end up somewhere they never expected: convinced that a ledger no one controls is harder to cheat than the bank down the street. Along the way the book quietly teaches the whole machine - keys and signatures, the chain, mining, why nobody can print more, how to actually buy and hold it without losing everything, and how to spot the scams built to take it from you.
By the last page, you'll actually understand:
- What Bitcoin and "blockchain" really are -- and why there's no coin anywhere
- Keys and signatures, blocks and headers, transactions, nodes, miners and why your money can't be forged or guessed
- Mining, and why no one can ever make more than 21 million
- How to buy your first bitcoin on an exchange — without getting burned
- Wallets, and the twelve ordinary words that hold (or lose) everything
- How to spot the scams built to take it from you
It is the rare explainer that respects you enough to be honest about the costs as well as the magic. If you've read three articles about Bitcoin and still couldn't say what it really *is*, start here.
Written by Ritesh Modi - a longtime blockchain educator and author of two books on smart-contract programming - whose philosophy is simple and severe: make a hard thing clear without making it any smaller than the truth allows.
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About the Author
Ritesh Modi
Ritesh Modi is Head of AI at MarketOnce and a former Forward Deployed Engineer at Microsoft. He has spent more than a decade building and shipping production systems across cloud, distributed computing, and applied machine learning, working with organizations ranging from global enterprises to fast-moving startups. His recent work focuses on applied large language models, designing systems that turn pretrained models into reliable, task-specific tools.
Ritesh has authored multiple technology books and speaks regularly at industry conferences on AI, cloud architecture, and software engineering. His writing philosophy rests on a simple belief: the best technical books are written by practitioners who still remember what it felt like to not understand something, not by experts who have forgotten. Every explanation in this book was tested against that standard, if it would not have made sense to him when he was first learning this material, it was rewritten until it did.
He writes, shares ideas, and connects with readers at www.riteshmodi.com. When he is not writing or building AI systems, he can be found mentoring engineers, exploring new architectures, or debugging a training run that should have converged three hours ago.
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