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The door: what an agent should know before it acts on a site

Quickstart: ask before you act

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

The signed answer about any domain, laid out for a person

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Capability registry

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Verify a record

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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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Glossary · Accessibility and provenance

C2PA claim

The signed manifest component that binds assertion references and related information.

What C2PA claim does not show

Valid structure and signature establish integrity under the trust model, not factual accuracy.

Terms this definition uses

Definitions that name C2PA claim

Claim signature

Related terms in Accessibility and provenance

What a page owes a keyboard, a screen reader and a fact-checker: the accessibility basics and the C2PA vocabulary for proving where a file came from.

Keyboard accessibility · Focus order · Focus indicator · ARIA · Accessible description · Color contrast · Reduced motion · Captions · Audio description · Status message · Content Credential · C2PA assertion · Claim signature · Manifest store · Content binding · Hard binding · Soft binding · Ingredient · Trust list · landmark · contrast ratio

Questions about C2PA claim

What is C2PA claim?

The signed manifest component that binds assertion references and related information.

What does C2PA claim not show or guarantee?

Valid structure and signature establish integrity under the trust model, not factual accuracy.

Which area of the glossary does C2PA claim belong to?

Accessibility and provenance: What a page owes a keyboard, a screen reader and a fact-checker: the accessibility basics and the C2PA vocabulary for proving where a file came from.

← C2PA assertion · Claim signature →

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