‹ CHAPTER 7, ALL LESSONS

PATHFINDER · CHAPTER 7 · LESSON 5 OF 5

Reading the whitepaper

What the paper got right

Years later, what held and what changed? 5 min

What held

  • Blocks chained by hashes and secured by proof of work: unchanged since 2009.
  • The heaviest chain decides the history: still the rule every node applies.
  • Rewards and fees as the incentive: still how blocks are paid for.
  • No central server and no one in charge: the network has kept running since the genesis block.

What changed

One CPU one vote did not last. Mining moved from processors to graphics cards, then to ASICs, machines built only to compute the Bitcoin hash. The roles also split: in the paper every node mines, today most nodes only verify.

The paper never mentions the 21 million limit. It only says that once a predetermined number of coins is in circulation, fees can take over. The exact schedule lives in the software, not in the paper.

Read it yourself

Section 11 calculates how quickly an attacker's chance of catching up drops as blocks are added, and section 8 describes a light way to check payments without the full chain. The paper is short and plain. Reading it once is the best way to see how few ideas the whole system rests on.

▶ SEE IT IN THE MACHINE

Stand in front of the white paper in the hall: what is engraved there is the real text.

What to remember

  • Chained blocks, proof of work and the heaviest chain rule are unchanged.
  • Mining moved to ASICs and most nodes no longer mine.
  • The 21 million cap is in the software, not in the paper.

Quick check

Which idea of the paper did NOT hold as written?

Does the whitepaper state the 21 million limit?