Public methodology
How evidence is preserved and described
This page explains the archive’s public standards. Publishing a methodology builds trust, while operational security details, source identities, and information that could endanger people remain private.
1. Acquire safely
Collect the original file and contextual information whenever possible. Source identities and contact details belong in a separate, access-controlled system.
2. Preserve the original
Keep the original file unchanged. Create a separate access copy for web playback, hazardous-metadata removal, and identity redaction.
3. Record integrity
Create a SHA-256 hash for every file so unintended changes can be detected. Log the acquisition date and each significant transfer.
4. Verify carefully
Assess time, place, source, and visible content separately. Publish the outcome as Under review, Corroborated, or Verified.
5. Publish responsibly
Never use graphic thumbnails or autoplay. Give a clear warning before a visitor chooses to reveal sensitive media.
6. Correct transparently
Review new information, errors, and safety requests. Record every material change in the internal history for that item.
Minimum record fields
- Unique record ID
- Precise title and caption
- Media type
- Date and place with confidence level
- Acquisition method
- Verification status
- Archive accession date
- SHA-256 integrity hash
- Consent and security restrictions
What the statuses mean
- Under review
- The record is preserved, but there is not yet enough information for a firm conclusion.
- Corroborated
- Important elements are consistent with one or more independent sources.
- Verified
- The archive has high confidence in authenticity, time, place, or another key claim under its documented process.
Important: “Verified” does not mean that every allegation is legally proven or that criminal responsibility has been established.
Safety and dignity
Publication must not endanger witnesses, families, or identifiable people. When in doubt, keep exact locations, identities, voices, faces, device metadata, and contact information private.