> ## Documentation Index
> Fetch the complete documentation index at: https://reversi.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Trace viewer

> A single HTML file that verifies a ledger and shows the timeline.

Open `viewer/index.html` in a browser, then drop a `ledger.jsonl`. It runs entirely locally with WebCrypto, so
nothing is uploaded. It verifies the chain, flags the first bad record, and filters by run or to problems only
(`blocked`, `would_block`, `failed`, `uncertain`, `unrecoverable`, `deferred`).

It needs a secure context for `crypto.subtle`; opening the file directly or serving it over HTTPS works.


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