Frame 05 · Evidence is immutable. Inference is not.

The Causal Detective

At 21:00, the Blackglass Seal vanished from a room locked from the outside. Every observation is a canonical-JSON SHA-256 frame. Solve the impossible chronology—without rewriting a single fact.

What you are looking at

A locked-room case built from immutable frames: observations, movements, access events, transfers, alibis, and forensic results.

Do this

Read the evidence, then connect exact earlier hashes for person, object, location, lifecycle, and chronology to mint an accusation.

Watch for

The browser recomputes every canonical frame with real SHA-256, but valid cryptographic shape does not make a clue causally possible.

What this demonstrates

Competing theories can share immutable facts while interpretations diverge, and only an exactly supported causal conclusion is accepted.

The evidence room

A locked-room timeline rendered from the current frame set.

evidence hash causally consistent semantic contradiction

Accusation assembler

Select exact earlier frame hashes. Reusing one hash in two roles is rejected.

Guided

Step 1 of 5 · Who had access?

Find the access event that places a named person inside the opportunity window.

Fork competing suspect theories

Theory frames point to the same evidence head. Facts remain unchanged; interpretation branches.

0 forks

Rebuild this proof with any LLM

Copy a model-neutral specification. Ask for an independent implementation, not an explanation.

Build one offline HTML file called “The Causal Detective.” Use synthetic fictional locked-room evidence represented only as canonical JSON frames hashed with the browser’s real Web Crypto SHA-256. Each frame must include a previous-frame hash and may cite exact earlier hashes as causes. Let a reader assemble an accusation by selecting hashes for person, object, location, lifecycle, and chronology. Accept only the exact causally supported combination; reject duplicate evidence and unsupported conclusions. Let readers fork at least three competing theory frames from one immutable evidence head and compare shared cited facts versus divergent interpretations. Include a failure control that appends a semantically impossible clue, correctly recomputes its SHA-256, shows cryptographic validation passing, and shows a deterministic causal-transition oracle failing. Include four newcomer panels, a scope/limitations note, guided and manual modes, evidence replay, reset, a canonical JSON ledger, live assertions, mutation controls, keyboard access, aria-live announcements, 44px targets, 390px layout, reduced-motion handling, and light/dark theme support. Do not use external assets or services.