Check a game didn’t change its answer

A game with a hidden answer (a culprit, a word, a quiz key, an exit code) publishes a fingerprint of it, a SHA-256 hash, before you play. When the game ends and prints its sealed file, paste the file here. Your browser recomputes the fingerprint; if it matches, the seal turns green and the answer was fixed before you started. Nothing is sent anywhere.

Game (fills in its published hash)

Paste the sealed file (it contains SOLUTION and SALT)

The sealed file is published with the game. At the end of a run your game master opens it and prints it: paste all of it, exactly as printed, or open the file's address (it is in the game's play prompt) and copy it from there. A retelling in the AI's own words won't match. Played a game before it was re-sealed? Pick its earlier edition in the list.

Published hash (SHA-256)

VerifierPaste the sealed file and its hash, then check.

Audit a dice tape

A game that rolls dice never lets the narrator pick the number. The role-playing games roll in the app's code tool when it has one (shown as d20=NN); every other roll comes from the dice tape, a list of d20 results generated from a fixed seed and published with the game. Pick a game to rebuild its tape here, in your browser, and compare it with the rolls your game master showed: if it showed tape#14=17, position 14 should read 17. Nothing is sent anywhere.