In the Foundation courses, you learned that a blockchain is a shared record held across thousands of computers, and that its security comes from the fact that so many copies exist simultaneously. That explanation is accurate, but it leaves a lot out. How do those thousands of computers actually agree on what to write in the record? What stops them from disagreeing with each other? How do you know when a transaction is truly final and cannot be undone? Why can some blockchains handle many transactions quickly while others are slow? And what happens when things go wrong?
This chapter answers all of those questions. Each module goes one level deeper into how blockchains actually function, with the goal of giving you a genuine understanding of the technology rather than just a surface-level description of it. You do not need to be a programmer or a mathematician to follow this material. Every idea is explained in plain language with examples. What you do need is patience and a willingness to think carefully about things that are, at root, genuinely clever and interesting.
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