Engagement · Provenance

Greyline Provenance

A structured assessment of whether a contested recording, image or file is what it is presented to be.

What This Is

What this is.


Where a recording or image is disputed, the question is rarely answerable with a simple yes or no. A finding needs to explain what was tested and why it points where it does.

The assessment examines integrity and origin: file metadata, container and encoding history, and content credentials where present. It also reviews evidence of re-encoding or editing, device and codec consistency, and internal plausibility. Findings are expressed as consistent with, not consistent with, or indeterminate, with the reasoning and its limits stated in full.

Two engagement modes are available, Standard and Litigation, set out below.

Engagement Modes

Two ways this runs.


Standard

Deliverable
Written assessment with reasoning and stated limitations
Use
Internal decision-making, HR, insurance, pre-action
Availability for questions
Written clarification

Litigation

Deliverable
Report prepared to the standard required of expert evidence, including duty declaration, range of opinion and statement of truth
Use
Filed evidence, rebuttal of an opponent's exhibit
Availability for questions
Availability to answer questions on the report
What Is Included

What is included.


Assessment of file integrity, metadata and encoding history

Review of content credentials and provenance signals where present

Analysis of editing, re-encoding and compression artefacts

Assessment of internal consistency, including acoustic and physical plausibility

Written findings with reasoning, confidence and stated limitations

What Is Not Included

What is not included.


A binary determination that content is or is not artificially generated

Speaker identification or voice attribution to a named individual

Recovery, extraction or acquisition of files from a device

Assessment of re-recorded or screen-captured material where original files are unavailable, unless expressly agreed in scope

Who This Is For

Who this is for.


Solicitors and barristers in family, employment and civil matters, insurers, and in-house counsel most commonly instruct this work. Individuals responding to a contested recording also instruct it directly.

How It Runs

How it runs.


  1. Source files are submitted through a confidential inquiry, along with the question the assessment needs to answer.

  2. The engagement mode, Standard or Litigation, is confirmed at scoping, along with turnaround.

  3. Metadata, encoding history, content credentials and internal consistency are examined against the original files.

  4. Findings are reviewed by the principal and expressed as consistent with, not consistent with, or indeterminate, with reasoning stated in full.

  5. The report is delivered. Written clarification, or availability to answer questions under the Litigation mode, follows afterward.

Cadence and Deliverable

How this is delivered.


Turnaround for a single-file assessment is three working days from receipt of usable source material, not from the date of instruction. Volume or format complexity may extend this; any extension is agreed in writing before work proceeds.

Shape
Fixed scope
Cadence
Single engagement
Deliverable
Written authenticity assessment, Standard or Litigation mode
Review
Principal-reviewed before release
Limitations and Scope

Limitations and scope.


Assessment of contested media carries real limits, stated here rather than left implicit.

  • Detection tooling is probabilistic, and its reliability degrades with compression, re-encoding and platform transmission. An indeterminate finding is a legitimate outcome and is reported as such.
  • Assessment quality depends on access to the original file. Screenshots, forwarded copies and screen recordings materially limit what can be established.
  • Turnaround runs from receipt of usable source material, not from the date of instruction.
  • The Litigation mode describes the standard the report is prepared to. It does not, on its own, state the preparing analyst's expert accreditation or courtroom experience; that is confirmed separately where it is relevant to a specific instruction.
Ready to Begin

Submit a confidential inquiry.

Every enquiry is reviewed by an analyst and routed to a scoping call, a written scope is confirmed before any work begins.