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Evidence integrity

Why original material is preserved before transformation and how later changes should remain detectable.

Evidence preservation has priority over analytical sophistication. Analysis can be repeated; an original source that has been overwritten cannot be recovered with the same confidence.

Preservation sequence

The public integrity contract is straightforward:

  1. capture lawfully accessible public material;
  2. record its source and canonical UTC capture time;
  3. calculate a cryptographic digest;
  4. seal the original representation;
  5. analyze a separate copy or derived representation;
  6. verify integrity before review or export.

SHA-256 is the default digest for captured artifacts. A digest can make later modification detectable, but it does not prove that the original source was true or that collection was authorized.

Originals remain separate

Analysis must never mutate preserved originals. Transformations, normalized values, previews, and model inputs are separate records linked back to the material from which they were produced.

Honest limitations

Local cryptographic integrity does not by itself provide independent trusted time, external anchoring, legal admissibility, or complete chain-of-custody assurance. Those properties require separately governed controls and qualified review.