Live
Every AI decision is sealed
Each decision gets a unique fingerprint of its exact contents, so it can't be quietly changed later. A decision on its own has no power to do anything.
SHA-256 content hash
Systems
See how Stone keeps AI in check.
A working 3D model of the whole Stone platform: the twelve checkpoints an AI request passes before anything happens. Click any part to see what it does — and whether it is live today or still being built.
- Live — in production now
- Built — rolling out
- Roadmap
The request that travels the model is example data — for illustration. If WebGL is unavailable, the same twelve parts render as a card grid with the same descriptions.
How to use the model
Three things to try.
- 1 · Watch a request go through
- Press F, or click Fire a request. You'll watch one request travel through all twelve checkpoints in about twenty seconds.
- 2 · See who's in charge
- Press 2 to stack the model as a pyramid. People sit at the top; every other part exists to support their decisions. Press 1 to go back.
- 3 · Switch to the technical view
- Open Tweaks and turn off Explain it simply. Every part switches from plain English to the engineering detail.
Shortcuts while the model is on screen: F request · T guided tour · 1–4 change layout · L labels · R reset · Esc close.
Live today
What you can use right now.
Everything below is running on writteninstone.io today — and you can check each one yourself.
Live
Every approval is signed
When someone approves or rejects a decision, that answer is cryptographically signed and locked to that exact decision. Change anything and the signature breaks.
Ed25519 signatures
Live
A record that can't be rewritten
Every event is linked to the one before it, and the database refuses edits and deletions. The history stays exactly as it happened.
Hash-chained, append-only ledger
Live
Proof anyone can check
Anyone — a customer, an auditor, a regulator — can verify a decision on a public page, no account needed. The record is also timestamped hourly with an independent public service.
Public receipts at /proof · OpenTimestamps (best effort)
Live
Your records stay yours
Each customer's decisions, approvals and billing are walled off by the database itself — not just by our application code.
Postgres row-level security
Live
More than one AI weighs in
Decisions are voted on by AI models and the majority wins. If none can answer, the result is "hold" — never a guess. It's built for several providers; one is active today, and its health is public on Status.
Majority vote · deterministic tiebreak
Don't take our word for it
Check it yourself.
A system built to prove decisions should be easy to check. Start here.
Straight talk
What we don't claim.
We don't hold SOC 2, ISO or other certifications, and no software can make your company compliant on its own. What Stone gives you is the proof auditors ask for: a signed, permanent record of who approved what, and when — one anyone can check.