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For agents

Quickstart: ask before you act

MCP, curl, Python, OpenAI Agents, Claude tool use, LangChain

Every endpoint, with a worked example from production

Resolve protocol

The signed answer: what it holds, how to verify it

SDKs: npm and PyPI

Typed clients, the offline verifier, conformance fixtures

Capability registry

What sites declare agents can do, and what was verified

How each named agent behaves on sites, from verified requests

Every finding the measurement can raise, with its revision

The Ed25519 keys every answer is signed with

Before you act

One signed answer, no key.

Read, cite, connect or transact: ask first, verify the receipt offline, keep it with the action.

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For sites

The checks behind the audit, one at a time

Is your business record right where agents look?

Compare two sites

Two domains, side by side, same measurement

What search and answer engines read from a video

Browser extension

The second vantage point: from your own address, after JavaScript

The record on your phone, with receipts

Your site

Measured as agents see it.

A free A–F audit with every defect named, no account. Fix it, then prove it held.

Learn

Findings from the measurement, with the numbers

Every term the product uses, defined

Who sends each agent, what it reads, how to verify it

Evidence

The public census and the daily snapshot, CC BY 4.0

Proof and timestamps

How every record is sealed and anchored

SEO and AI tools, measured

The vendors that measure sites, measured by the same rules

Registry: media kits, llms.txt, entity graphs

Verified machine-readable profiles of real organisations

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Glossary · Proof and provenance

Manifest tampering

Editing a change log or metadata record after the fact.

What Manifest tampering means

Hash-chained records make it detectable: the edit no longer matches the digest that was sealed at the time.

Related terms in Proof and provenance

Showing a record existed at a date without asking anyone to trust us.

transparency log · signed tree head · inclusion proof · log witness · split-view attack · cite-as link · as-of answer · citation anchor · canonical origin · signed absence · threshold verdict · OpenTimestamps · anchoring · Content hash · C2PA · CAWG training and data mining assertion · content-addressed storage · Merkle tree · SHA-256 · daily seal · byline · dateline · trust center

Questions about Manifest tampering

What is Manifest tampering?

Editing a change log or metadata record after the fact.

Which area of the glossary does Manifest tampering belong to?

Proof and provenance: Showing a record existed at a date without asking anyone to trust us.

← Content hash · C2PA →

See it in the full glossary · 731 terms across 19 areas.