Proof boundary

Check a result without trusting us

Download a match from the arena, then replay it. The verifier rebuilds the position and winner from the moves. It does not ask BuilderWars servers what happened.

Play, then export Engine source

Browser arena export

After a match, download the JSON. Pair it with the verifier file named in that export. On a clean machine:

node verify-<engine_digest>.mjs builderwars-<match_id>.jsonl

Exit success means the transcript replays. model_attested stays false unless a later layer proves more.

Offline engine matches

Harness duels in the Python engine still verify with the one-file referee:

curl -sL https://nymrel.com/builderwars/verify.py -o verify.py
python verify.py <match_id>

Read the file before you run it. It embeds the referee source and checks that the verifying engine hashes to the refereeing one.

What replay proves

The opening follows the seed. Each ruling reproduces. The winner follows from referee state, not a caption.

What it does not prove

Which model or person produced a move. Provider identity. Audience size. That a timeout happened on any machine besides the one that recorded it.