Check the source
Preserve received files without modification.
Read the method →VIGIFRAUDE® · PACTA CYBER LAB
Digital records become more useful when their source, date, collection method and subsequent handling can be explained.

A screenshot records what appeared on a display at one point in time. It does not necessarily establish who controlled the content or whether it has changed.
Where appropriate, preserve the original email and full headers rather than relying solely on an image. Record relevant web addresses and the circumstances in which material was obtained.
Preserve received files without modification.
Read the method →Record the context of each collection.
Prevention →Separate originals and analysis copies.
First steps →Keep source files separate from edited versions used for analysis or presentation. Clear filenames and a simple inventory can prevent confusion.
A SHA-256 checksum can help identify whether file bytes changed. It does not independently establish that the content is genuine or admissible for a particular legal purpose.
Metadata may be missing, misleading or intentionally altered. Interpret it as one possible technical clue requiring further validation.
Experience in online research since 1999 has shown Alain Stevens the value of reproducible records and of acknowledging what a technical observation cannot prove.
Vigifraude does not claim to provide court-certified evidence or regulated investigative services.
For a technical question, software project or training request, describe the need without sending credentials or unnecessary personal data.
VIGIFRAUDE® · PACTA CYBER LAB
Requests are evaluated against technical objectives and the limits of the available services.