Live demo — illustrative data, production architecture. The verify tokens below are seeded examples for poking the verifier; the schema, signing, and revocation flow are real.

Live Interactive Demo

See How Good Proof Gates AI Actions

Watch a real AI agent check a stamp before taking a high-impact action. Try a prompt injection attack. See why it fails.

Sector:

Scenario 1: The Gate Check

An AI agent is about to take a high-impact action. Before it executes, it queries Good Proof.

ai-agent — insurance

▸

AI Agent: Denying hardship claim #HC-4821 for policyholder...

▸

Gate Check: fetch("https://verify.goodproof.mindchill.ai/api/verify/stamp/h4qd9wb9spyw")

▸

Response: status: VALID

✓ Action Permitted

Action proceeds within verified scope

▸scope: hardship_claim_denial · stamp: h4qd9wb9spyw

View real stamp

No stamp? Action blocked.

When no stamp is found, the gate returns NOT_VERIFIED and the action is blocked. This is fail-closed by default — no stamp means no ship.

200→{ "mindchill:verificationStatus": "not-verified", ... }

Scenario 2: The persuasion that doesn't matter

Try a prompt injection attack. See why prompt tricks cannot bypass an external reliance gate.

Step 1

Tell the agent what to do

0/1000

Agent reasoning

this is what we are NOT relying on

Send an instruction to see how the agent reasons.

Reliance gate (external)

not the agent

Idle. Awaiting a reliance request from the agent.

The 13 binding fields

What the Stamp binds to

Every Good Proof Stamp cryptographically binds these 13 fields. Change any one of them and the Stamp must be re-verified or withdrawn.

action class
The category of high-impact action this Stamp authorises (e.g. tool execution, irreversible transfer, eligibility decision).
scope summary
The boundaries of the action — what is in scope and what is not. Acceptance is limited to this scope.
policy version
The exact policy version under which the Stamp was issued. Policy changes trigger NEEDS_REFRESH.
verification mode
Auto-stamp, Guardian-sealed, or hybrid — how the verification was carried out.

workflow / prompt hash
Hash of the workflow definition (or prompt template, for AI lanes) bound at issuance.
model version
For AI-assisted lanes, the exact model snapshot bound at issuance. Model change triggers NEEDS_REFRESH.
tool permission manifest
The full set of tools and permissions the bound action class is authorised to use.
evidence pack hash
Hash of the IDA Evidence Pack snapshot — the dispute-ready, time-stamped artefact that travels with the Stamp.
signer reference
The signing authority that issued the Stamp (programme-scoped HSM key or Guardian panel reference).

expiry
ISO 8601 timestamp at which validity ends. After expiry, status transitions to NEEDS_REFRESH automatically.
revocation status
Whether the Stamp is live, revoked, or pending withdrawal. Revocation is append-only — older signatures remain verifiable.
escalation rule
What happens when status is not VALID — block, escalate to Guardian, route to a human, or fail closed.

jurisdiction / programme scope
The programme, contract, or regulatory regime that defines acceptance criteria. Acceptance depends on counterparty and programme.

This is what makes a Stamp portable, machine-checkable, and dispute-ready — and what makes it impossible for the agent to forge.

Export this list as a PDF for procurement

Sprint Call to Production in 30 Days

From first conversation to live verification in production. Here's the journey.

See regulatory drivers across 8 regions

See how Good Proof works in Insurance

You just tested the gate for insurance actions. Explore real-world use cases, stamped specimens, and sector-specific verification lanes.

Insurance

Real-world use cases, stamped specimens, and pre-filled Sprint form

Banking / Fintech

credit decision gate

Healthcare

triage priority gate

Government / Public Services

benefit denial gate

Platforms / Trust & Safety

content takedown gate

See what a stamped IDA Evidence Pack looks like

Every Good Proof Stamp ships two artifacts: a live Status Link and a time-stamped IDA Evidence Pack.

Live Status Link

Real-time verification endpoint

token: h4qd9wb9spyw

status: VALID

scope: hardship_determination

expires: 2026-08-15

Try the verifier

IDA Evidence Pack

Time-stamped dispute-ready snapshot

signer: guardian_panel_uk_01

version: 2026.01.21.1

hash: sha256:7f3a...

window: 90 days

Browse stamped specimens

Ready to gate your AI actions?

Book a 25-minute Sprint call. Identify your first verification lane. Ship in 30 days.

Book a Stamp Sprint View Pricing

Or explore Insurance examples

See How Good Proof Gates AI Actions