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50. Capstone: reviewing a full protocol

Putting every topic together.

1 min read3 questionsup to 50 XPtopic 50/50

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AI translates the explanation and quiz text while preserving code and answer scoring.

Take the staking contract you built: draw the state machine, list every external call, name the invariants, and write tests that try to violate each one. Then check the operational side — who holds the keys, how rewards are funded, what happens if the oracle stops, and how users exit if the team disappears.

solidity
invariant: address(this).balance >= totalStaked
invariant: sum(positions[i].amount) == totalStaked

A protocol is finished when its failure modes are documented, not when it compiles.

How to study this topic

  1. 1. Read the explanation once end to end, skipping the code.
  2. 2. Re-read the code snippets and say out loud what each line does.
  3. 3. Answer the quiz without scrolling back — that is the real check.
  4. 4. Read every explanation, even for the answers you got right.

Scoring

  • · Up to 30 XP from quiz accuracy.
  • · +15 XP for a perfect first attempt.
  • · +5 XP while a 3-day streak is running.
  • · 75% or higher marks the topic complete.

Check your understanding

  1. 1. What defines a finished protocol here?

  2. 2. Which invariant fits a staking pool?

  3. 3. What operational question matters most?

Badges

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