Sunday blindfold quiz: 5 questions, no peeking at the map

Rules: answer from memory, in your own words, one or two lines each. Like blindfold chess: the map is the board, and this checks whether you can still “see” it. Claude marks it on Sunday and shows where your mental board drifts from the real one.

Scoring: 1 point each. 5 = grandmaster (you can play it blind) · 4 = master · 3 = club player · 2 or less = we walk that branch of the map together.

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1. The opening (branch 02 → 04) Starting from a message’s bytes, name the stages in order until you have the 128-bit Refracting Light digest. (Hint: there are about six.)

2. The middle game (branch 06) Why can’t someone copy a Rad that you found and claim it as their own?

3. The two towers (branch 08) The block header has two Merkle roots side by side. What does each one hold, and what extra number is sealed into each root, and why?

4. The trap (branch 07) In one sentence: what is “Paradox A”? And what is the fixed puzzle size we chose to fix it?

5. The endgame (addresses) Why is a single-owner address RL v3 128 ‖ SHAKE256 128, and not just Refracting Light on its own? Give one reason about quantum computers and one about “what if a hash breaks”.