# A verified information layer that labels and links cancer content across platforms

Source: https://onco.cc/ideas/idea-moon-verified-information-layer/  
OnCo record `idea-moon-verified-information-layer` (Idea). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

Wherever cancer information appears online, a visible marker shows whether it matches what trusted sources say, with a one-click link to the plain-language evidence.

## Summary

Platforms label some health content but coverage is thin and inconsistent. The proposal is an open, machine-readable registry of vetted cancer claims and sources (national cancer institute, cancer charities, guideline bodies) that platforms, browsers and AI assistants can query, delivered as a browser extension and platform API, with labels that link to plain-language summaries and disclose the sourcing. Independent governance keeps it credible.

## Fields

- Kind: Idea
- Last checked: 2026-09-08
- Hypothesis: Content carrying the verified label is trusted and shared more, and exposure to labelled contradictions reduces belief in false cancer claims in randomised exposure studies.
- Rationale: Credibility signals work when they are consistent, independent and easy to check; the missing piece is a shared open registry rather than each platform improvising.
- Proposed test: Build the registry for 500 common claims; randomised online experiment measuring belief and sharing with and without the layer; then a browser extension pilot with patient organisations.
- Maturity: speculative
- Actor: engineering

## Sources

- NCI PDQ cancer information summaries: https://www.cancer.gov/publications/pdq

## Connected records

- bottlenecks: [Knowledge reaches practice too slowly](https://onco.cc/bottlenecks/b-knowledge-diffusion/), [Misinformation and unproven therapies](https://onco.cc/bottlenecks/b-misinformation/)

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