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The structure fingerprint

Every distinct build has its own fingerprint — a short code worked out from the final shape alone. Build the same thing a different way and you still get the same code; move one piece and it changes completely.

How it's worked out

1. Slide to a corner. Shift the whole model so its lowest, back-left corner sits at (0, 0, 0). Same shape, same starting point.
2. Pick one turn. Spin the model to each of its 4 upright rotations, write each one out as a string of numbers, and keep the one that sorts first. That's the "official" orientation — no guessing which way is "front".
3. Mirror images stay different. A castle and its mirror image are really different castles (slopes face the other way), so reflections are not merged.
4. Sort & list. Order every piece by height, then position, then type, and write it all out as a fixed row of numbers.
5. Hash it. Run that through SHA-256 — a one-way scrambler. The first part of the result is your fingerprint.

How many builds are there?

Just six 2×4 bricks can be stacked 915,103,765 different ways (a real count, by Eilers). Add pieces and that number explodes. But people build walls and towers and recognisable things, not random blobs — so a "memorable" little model is far less unique than the raw count suggests.

Match check

This build's fingerprint:

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Paste another fingerprint (or a whole share code / model JSON) to compare: