Free sample · synthetic

What an Evidence File shows

One company report, four AI summaries of it, and every claim in each summary checked against the report. Each summary was written to plant one thing: nothing, a contradiction, a true claim the report never makes, and a missing fact.

Everything here is invented. Ridgeway Analytics, its founder and its figures do not exist. The verdicts are the ones each summary was built to produce, and the digests are computed from the texts on this page.

The register

Four outputs, two results each

The first page of every Evidence File: each output with both of its results, and the claim counts behind them.

Output	What was planted	Accuracy	Completeness	Claims
1. A faithful summary	Nothing. Every claim is in the source.	No contradictions found	Not measured	6S 0C 0U of 6
2. A planted contradiction	One claim the source says is false.	Contradictions found	Not measured	4S 1C 0U of 5
3. A true claim the source never makes	One claim that is true in the world but absent from the source.	No contradictions found	Not measured	4S 0C 1U of 5
4. A planted omission	Every claim is right, and one material fact is missing.	No contradictions found	Material facts dropped	8S 0C 0U of 8

S supported, C contradicted, U unsupported. No claim in this sample is disputed.

The source

What every output is checked against

Ridgeway Analytics FY24 (synthetic). Nine statements, then a reference line and a retrieval date, which a certificate treats as apparatus rather than as claims.

Source text

Ridgeway Analytics was founded in 2011 by Aisling Mercer. The company employs 240 people across three offices. Its head office is in Bristol, and the second office opened in Leeds in 2018. Revenue for the year ending March 2024 was 18.4 million pounds. The board approved a dividend of 12 pence per share. The largest customer accounts for 31% of revenue. The company has never made an acquisition. Staff turnover fell from 19% to 11% between 2022 and 2024. The pension scheme was closed to new members in 2016. doi : 10 1016/j.example.2024.01.002 Retrieved 4 March 2025.

sha-256 479ca6b5b6cc352125be7560e7a359163d050ec83ea5bb19bc354b56d5171b5c

The certificates

Claim by claim, with the passage each verdict rests on

Certificate of Accuracy · output 2 of 4

A planted contradiction

Synthetic sample

AccuracyContradictions found5 claims: 4 supported, 1 contradicted, 0 unsupported, 0 disputed

CompletenessNot measuredNot measured on this output

The output, claim by claim

Ridgeway Analytics was founded in 2011 by Aisling Mercer.

Supported

Source: “Ridgeway Analytics was founded in 2011 by Aisling Mercer.”

It employs 240 people across three offices.

Supported

Source: “The company employs 240 people across three offices.”

The company completed two acquisitions in 2023.

Contradicted

Source: “The company has never made an acquisition.”

The source says the company has never made an acquisition.

Revenue for the year ending March 2024 was 18.4 million pounds.

Supported

Source: “Revenue for the year ending March 2024 was 18.4 million pounds.”

Staff turnover fell from 19% to 11% between 2022 and 2024.

Supported

Source: “Staff turnover fell from 19% to 11% between 2022 and 2024.”

Omissions

Completeness is measured on the fourth output only in this sample, so the planted omission is the one that shows. In a real Evidence File it is measured on every output unless you agree otherwise.

Issued against

Source: Ridgeway Analytics FY24 (synthetic)

source sha-256 479ca6b5b6cc352125be7560e7a359163d050ec83ea5bb19bc354b56d5171b5c

output sha-256 909e3e47a452ea2a8c3c1bf41682eb16a4699356f2253637702e8cd1c09f3b95

reference: none (samples are not registered, so this one will not verify)

Three more certificates

See the faithful summary, the true-but-unsourced claim, and the omission

The fourth is the one most checks miss: right on every claim it makes, and still missing the fact a reader would most want. Tell us where to send a copy and all three open here.

Method

How each verdict is reached

Each output is broken into the claims it makes.
Two independent models check every claim against the source. A claim they disagree on is marked disputed and left for a person.
A supported or contradicted verdict quotes the passage of the source it rests on.
Completeness lists the material facts in the source and reports any the output left out, separately from accuracy.

Limits

What a certificate does not certify

It certifies the output against this source. It does not certify that the source is right, or which system wrote the output.
“No contradictions found” is not a statement that the output is true.
This sample is synthetic and is not in the certificate registry, so it will not verify. A real certificate carries an AEF reference that does.

The method in full: checking an AI document against its sources

The same record, for your own AI outputs

The Accuracy Evidence File certifies up to 30 of your outputs against their sources in three weeks, at a fixed price, with your reviewer on every dispute.

See the Accuracy Evidence File