Fail-closed doctrine: evidence, proof and selling tools

Official CAIN-42 IHVRK · New to this product? Learn it first

Don't trust CAIN-42. Verify CAIN-42. This is the Independent Human Verification Resource Kit for Fail-closed doctrine: every claim its page makes, as the exact request and the answer it must give, recorded live and signed. You check it on your own machine with a short Python script that uses no CAIN-42 code.

Every claim matched when recorded

Download the kit (.zip)

Everything you can give a customer

Selling tools

Pitch, emails, call script, objection answers, one-page summary, proposal.

Evidence pack

The figures and a ready email to an auditor or security reviewer.

Answers to buyer questions

Paste into a security questionnaire: YES, PARTIAL, NO or ASK.

Figures & benchmarks

Every number from the signed record, ready for a spreadsheet.

The kit

Kit	`fail-closed-20261103T224642`
Recorded	2026-11-03T22:46:42+00:00 against cainstudio.online
Claims	14
Zip SHA-256	`6cb4576c7bc7c1d594181ed316b8897461003afc4f300e12ee9f0cf75c45d544` (also in SHA256SUMS)
Signing key fingerprint	`1cacdfc1fc2024b6bb4f8fb02c7c80f4a57f44c5adb11c507190781b5d613de3`, published on cainstudio.online · mcpgate.online · clawx.click

Verify it on your own machine

unzip cain42-ihvrk-fail-closed.zip && cd cain42-ihvrk-fail-closed
python3 verify.py            # offline: hashes, Ed25519 signature, recorded answers
python3 verify.py --live     # also re-send every request yourself and check the answers now

A claim that cannot be checked counts as a FAIL, never a pass. The live check is the one that depends on nothing we recorded.

The claims in this kit

#	Claim	Answer must contain
C01	Honest read, brand-new agent -> A reasonable action from a principal with no trust history. Unknown trust is held for a human, not allowed.	`["REQUIRE_APPROVAL"]`
C02	Prompt injection in the payload -> The risk stage screens every nested key and value; a hit on an enforcing stage blocks.	`["BLOCKED"]`
C03	Malformed plan -> A plan the checker cannot read is an unanswered check, and an unanswered enforcing check blocks.	`["BLOCKED"]`
C04	Mission escalation -> A tool outside the declared mission is refused even though the caller is authenticated.	`["BLOCKED"]`
C05	Consequence horizon exhausted -> The uncertainty budget for this agent is spent; more autonomy is not granted on credit.	`["BLOCKED"]`
C06	Governance program needs re-authorization -> A signed policy program that does not re-execute to ALLOW for exactly this call refuses it.	`["BLOCKED"]`
C07	Action outside its predicted bounds -> Predictions can only restrict: an action the signed prediction does not cover is refused.	`["BLOCKED"]`
C08	Swapped autonomy certificate -> A certificate issued for a different configuration does not transfer.	`["BLOCKED"]`
C09	Authority carried across domains -> Another governance domain's agreement never becomes permission here.	`["BLOCKED"]`
C10	Confused-deputy continuity permit -> Replica receipts for a different action or arguments do not authorize this one.	`["BLOCKED"]`
C11	Proofs naming two different agents -> Every declared proof must name one subject; a mixed bundle is refused.	`["BLOCKED"]`
C12	Scenario nobody defined -> An unknown name is an error, not the default scenario.	`[]`
C13	Verifier call with no API key -> No credential is not an anonymous yes: the route refuses before it reads the body.	`[]`
C14	Tenant-scoped call with no tenant key -> A tenant-scoped route with no tenant is refused, never served from a default tenant.	`[]`

Evidence links you can give your customers

Kit download: /proof/bundle/ihvrk-kits/cain42-ihvrk-fail-closed.zip
Each file on its own: README.txt · claims.json · transcript.json · MANIFEST.json · MANIFEST.sig · kit-key.json · verify.py
Run the live demo yourself on any of the three sites: cainstudio.online · mcpgate.online · clawx.click
The product explained: /top25-fail-closed.html · what it does not do: limits
Signing key on three independent domains: cainstudio.online · mcpgate.online · clawx.click
Three ready-to-send evidence pages: 1. Evidence pack · 2. Answers to buyer questions · 3. Figures & benchmarks
Every kit: all IHVRKs · machine-readable index

Send this to your customer

Don't take our word for it. Verify Fail-closed doctrine yourself:
1. Download the official CAIN-42 IHVRK: https://cainstudio.online/proof/bundle/ihvrk-kits/cain42-ihvrk-fail-closed.zip
   SHA-256: 6cb4576c7bc7c1d594181ed316b8897461003afc4f300e12ee9f0cf75c45d544
2. Unzip it and run: python3 verify.py --live   (Python 3, standard library only, no account)
3. Check the signing key fingerprint 1cacdfc1fc2024b6bb4f8fb02c7c80f4a57f44c5adb11c507190781b5d613de3
   matches https://cainstudio.online/evidence-kit-key.json, https://mcpgate.online/evidence-kit-key.json and https://clawx.click/evidence-kit-key.json
Live demo: https://cainstudio.online/top25-fail-closed-lab.html
What it does not do: https://cainstudio.online/top25-fail-closed-limits.html

What this kit is, and is not

It shows what the live product answered to these inputs, and lets anyone check that again. It is not a third-party audit, a certification, or a promise about inputs not listed. The product's limits page lists what it does not do.