Learn Offline verifiers (NULLIUS): from zero to expert, then sell it

No AI background needed. Five levels, each with something to actually do, at your own pace. Tick items as you go (your ticks stay in this browser).

Evidence, proof and selling tools for Offline verifiers (NULLIUS)

Level 1 Beginner: understand it

Every vendor says its product works. We give the customer small, readable checker programs (NULLIUS, from the Latin "take nobody's word for it"). They import none of our code. The customer downloads our evidence, pins our public key, runs the checker, and gets VERIFIED or a reason why not.

To show the checkers are not a rubber stamp, on 2026-11-02 we changed every field of the sample evidence, one at a time: 2,319 edits. The checkers refused 2,274. The other 45 are harmless fields the documentation lists in advance, and none crashed the checker.

Think of it like this: Bringing your own scale to the market. Instead of trusting the seller's scale, you weigh the goods on yours. NULLIUS is a scale the customer can open up and inspect.

Read the full plain-English explanation: Offline verifiers (NULLIUS), explained.

I read the explanation above.
I can say what it does in one sentence, without notes.

Level 2 User: see it work

Run it live: open the live demo. Before each result, guess what will happen. These are checks it must pass:

Ledger: latest record with its verdict edited to NOT_VERIFIED: Changing any signed field breaks the record hash and signature.
Receipt with decision flipped to ALLOW on a DENY: The signature covers the decision.
Edit an event after sealing: Changing one event changes its hash and the root.
Digest changed: The quorum signed this digest, not yours.
KEYSTONE ledger chain re-verifies: The whole hash chain, live.

I ran the live demo.
I can explain what one of these checks shows.

Level 3 Verifier: prove it yourself

This is the skill that sets you apart: you don't have to believe us, and neither do your customers.

Install Python 3 if you don't have it (python.org/downloads).
Download the kit and unzip it.
Open a terminal in that folder. On Windows, click the folder's address bar, type cmd and press Enter. On a Mac, right-click the folder and choose New Terminal at Folder.
Run python3 verify.py (on Windows, python verify.py). It checks the seal without the internet.
Run python3 verify.py --live. It repeats every check from your own computer.
Try to cheat it: open transcript.json in a text editor, change one character, save, and run python3 verify.py again. It must now say FAIL. Unzip a fresh copy afterward.

I ran the kit's check on my own computer.
I changed a file and saw it fail.

Level 4 Expert: know the edges

An expert knows what a product does not do, and says it first. That is what makes a buyer trust you.

Read its limits page in full: what Offline verifiers (NULLIUS) does not do.

You can say

The checkers import no CAIN code and run offline.
We attacked them with 2,319 single-field edits; every accepted edit is a documented, non-signed field.
The result depends on the key the customer pins, from a source they trust.

Never say

"Independently verified": no third party has reproduced the results yet.
"Covers all our products": 3 of 18 verifiers are published.
"VERIFIED proves the AI did the right thing": it proves the record was not changed.

Read the questions real buyers send, with honest answers: answers to buyer questions.

Test yourself (click a question to see the answer)

Do you sell NULLIUS on its own?

No. It is free and builds trust for the paid offers.

What does VERIFIED prove?

That the record matches the signature and the pinned key, not that what it describes was right.

How many checkers are published?

3 of 18.

A prospect asks if a third party tested the checkers. Answer?

Not yet; that is why they are short enough to read yourself.

In the live check "Ledger: latest record with its verdict edited to NOT_VERIFIED", what answer must come back, and why?

false. Changing any signed field breaks the record hash and signature.

In the live check "Receipt with decision flipped to ALLOW on a DENY", what answer must come back, and why?

false. The signature covers the decision.

In the live check "Edit an event after sealing", what answer must come back, and why?

false. Changing one event changes its hash and the root.

Does a passing kit prove the product is safe for every possible input?

No. It proves what the live product answered to the inputs listed in the kit, and lets anyone check that again.

Has an independent party audited or certified this product?

No. No third-party audit is complete and no certification is held. Say so if asked.

I got every quiz question right without looking.
I can name one thing it does not do.
I explained it to a friend, and they understood it.

Want a formal study path? The CAIN Academy has courses and exams. Finishing this page is your own practice; it is not a qualification or certification.

Level 5 Seller: put it in front of a customer

Copy, paste, send: the shortest route, no technical skill needed.
Who buys it and where to find them.
The sales conversation, then the offer and the close.
The rules: read these before your first message.
Selling tools with this product's evidence built in: pitch, emails, call script, objection answers, one-pager.

I read the rules.
I sent my first personal message.

About money: your share is agreed in writing with FIRME AI CORPORATION before your first message (email vincent@firmeai.com). Nothing here promises income. Most messages get no reply; that is normal.