Chain of Custody Governance Log for Melbourne In-House Counsel: Prove Every Hand That Touched the Evidence
Your expert witness ran a model over the dataset on a Tuesday. By the time the report lands on your desk three weeks later, no one can tell you which version of the model was used, who instructed the prompt, what the source corpus was, or whether a paralegal at the external firm re-ran it on a tighter timeline. Opposing counsel asks one question in cross — who handled this evidence, and when — and your expert hesitates. The Chain of Custody Governance Log is built so that hesitation never happens.
The problem
In-house counsel in Melbourne increasingly sit on top of evidence pipelines that span internal teams, external firms, expert witnesses, and AI-assisted analysis tools. Each handoff is an attribution risk. The Australian Solicitors’ Conduct Rules describe solicitors’ duties as officers of the court, including the duty of candour and the obligation not to mislead. When an expert report is built on AI-assisted analysis and no one can reconstruct who ran what, on which data, with which model version, the candour obligation becomes structurally hard to meet — not because anyone intended to mislead, but because the record doesn’t exist.
The threat is specific: expert evidence AI attribution failure. A model output appears in an expert’s report. The expert cannot say with confidence which version of the model produced it, what input was given, or who at which firm prompted the run. The evidentiary weight of the report drops. In some matters it falls away entirely. Cross-examination is the wrong place to discover that your governance record has gaps.
What the Chain of Custody Governance Log does
The Chain of Custody Governance Log produces an immutable, append-only record of every interaction with a piece of evidence — from collection through analysis, expert review, and tendering. Each entry captures: who touched the artefact, when, what tool or model was used (including version), what inputs were provided, what outputs were produced, and what downstream artefact the entry contributed to. The log is designed to be referenced directly in expert reports, witness statements, and discovery responses, and to survive a cross-examination on provenance.
It is a governance artefact, not a content-generation tool. It does not analyse evidence, draw conclusions, or replace expert judgment. It records, in a form that can be produced to the court, the chain that produced the evidence.
How it works
- Register the artefact. At collection, the evidence item is logged with a hash, source, custodian, and matter reference. This becomes the root entry.
- Capture each handoff. Every time the artefact (or a derivative) is accessed, transferred, or processed — internally, by an external firm, or by an expert witness — a log entry is appended with actor, timestamp, tool, and purpose.
- Record AI-assisted steps explicitly. When a model is run over the evidence, the entry captures model name, version, prompt or instruction, parameters, and output reference. Derivatives inherit the lineage of their parent.
- Lock the record. Entries are append-only and cryptographically chained, so any subsequent edit or omission is detectable.
- Produce the governance report. When the matter reaches expert report drafting or tender, the log is rendered into a chain-of-custody report attachable to the expert’s evidence, with each provenance claim mapped to a verifiable log entry.
Why this matters in Melbourne
Victoria operates under the Legal Profession Uniform Law, and the Australian Solicitors’ Conduct Rules apply to Melbourne solicitors as the Legal Profession Uniform Law Australian Solicitors’ Conduct Rules 2015. In-house counsel who instruct external firms and expert witnesses carry an interest in the integrity of the evidence those parties produce, even where they are not the solicitor on the record. The ASCR frames solicitors’ obligations as derived from their duties as officers of the court — duties of candour, of not misleading, and of competent practice. Where AI-assisted analysis touches expert evidence and the provenance record is incomplete, those duties become difficult to discharge as a matter of record, regardless of intent. A governance log is the artefact that makes the record reconstructable. For Melbourne in-house teams managing matters where expert evidence will be tendered in the Supreme Court of Victoria or the Federal Court’s Victorian registry, the cost of building the record after the fact — under subpoena, under cross — is materially higher than building it as you go.
Sources
- Law Council of Australia — Australian Solicitors’ Conduct Rules: https://lawcouncil.au/policy-agenda/regulation-of-the-profession-and-ethics/australian-solicitors-conduct-rules
- Exegesis capability reference — Chain of Custody Governance Log spec
- RuleCheck by Exegesis (open-source citation verifier): https://github.com/andrefabre/rulecheck
Join the waitlist
The Chain of Custody Governance Log is in design. We’re scoping it with in-house counsel who already feel the gap — matters where expert evidence involves AI-assisted analysis and where provenance is going to be tested. Join the waitlist and what we hear from you will shape how the deliverable is structured, what integrations come first, and what the access tiers look like.