A black box recorder for AI — live in your browser

Turn an AI workflow into a signed, hash-linked, tamper-evident evidence chain. Edit any step and watch the cryptographic proof break. Every hash is computed by your browser with the Web Crypto API.

● Sovereign: runs entirely client-side — no server, no API, no OpenAI

The evidence chain

Merkle root over the whole chain (anchor this to a public ledger for trustworthy time):

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What you're looking at

Each step's id is a SHA-256 over its actor, its parent ids, and the hash of its payload — so editing any field, or any ancestor, changes its id and every id downstream. The root is a Merkle root over all step ids. Hit Tamper: the edited step and the root both light up. This is provenance and tamper-evidence — it proves what happened, not that the AI was right, and trustworthy time comes from anchoring the root publicly, not from the hash. The Python proof & its honest limits ↗

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