Protecting Digital Evidence Means Preserving Its Authenticity

Video can establish a timeline, clarify an encounter, or reveal a detail that changes an investigation. Its usefulness depends, in part, on the ability to explain where it came from and whether it has been altered.

Those questions deserve attention from the moment a recording is created or collected. By the time footage is shared with prosecutors or challenged during a proceeding, its history should already be documented.

As digital evidence moves between people and systems, preserving authenticity means maintaining a verifiable connection between the recording and its origins.

Establishing a foundation for trust

An investigator may receive video from a surveillance system, a witness’s phone, or another agency. Each source brings a different level of visibility into how the recording was created and handled.

Documenting those origins helps establish what is known about the footage from the outset.
One way to do this is with cryptographic hashes. A hash functions as a digital fingerprint. Comparing a file against a previously recorded hash can help determine whether it has changed since that fingerprint was established.

That timing matters. Verification established at collection supports confidence in what happens afterward. It does not independently explain what happened before collection. Establishing trustworthy provenance as early as possible gives investigators more history to work with.

Preserving authenticity through necessary changes

Evidence rarely remains untouched throughout an investigation. Video may need to be converted for playback, shortened for review, or redacted before sharing.

These steps make documentation especially important. The source recording should remain identifiable, and processed versions should have a clear relationship to it. Reviewers need to understand which version they are viewing, what was changed, and why.

Moving beyond visual judgment

Synthetic media adds urgency to this work. A recording’s appearance alone cannot establish its authenticity.

For investigators, the rise of synthetic content reinforces the value of preserving verifiable information early. A documented history provides a foundation for assessing footage when visual inspection leaves questions unanswered.

Authenticity also has limits. An unchanged recording can still show only part of an event or be presented without important context. Verification supports an investigation; investigators must still interpret and corroborate what the footage shows.

Protecting digital evidence, therefore, requires consistent attention to its origins, integrity, and handling. When authenticity becomes part of everyday evidence workflows, teams are better prepared to explain why a recording deserves confidence and what that confidence is based on.

Explore how SWEAR supports authenticated digital evidence workflows as BCD introduces Digital Asset Engine at IACP 2026, October 25–27. Visit Dell Technologies booth #2929 to learn more.