Chain of Custody Starts Before the Loss
A risk manager photographs parking lot cracks in March. Asphalt separation, a water intrusion pattern, the kind of damage that’s been developing for months. The photos go into a SharePoint folder, labeled by date. Six months later, a slip-and-fall claim arrives. The plaintiff’s attorney argues the hazard was present for over a year and the property owner failed to act.
The risk manager has photos. SharePoint says March.
The plaintiff’s attorney says that’s exactly what someone would say after the fact.
The Weakness Nobody Talks About
File metadata is editable. That isn’t a conspiracy theory; it’s a design fact. File systems were built to be flexible. Created dates change during migrations. EXIF timestamps get overwritten by every piece of software that touches an image. Shared drives update metadata when files are synced, copied, or reopened by someone with different regional settings.
Courts know this. Forensic witnesses testify to it routinely. SharePoint isn’t neutral ground in litigation; it’s a database record maintained by the party with the most to gain from what it says. Opposing counsel doesn’t have to prove the date was changed. They only have to raise the question.
Once that question is raised, there’s no going back. You can’t retroactively establish when a file existed from the file itself.
What an Independent Timestamp Actually Looks Like
Blockchain anchoring works on a different principle than file metadata. The file never goes anywhere. What gets anchored is a SHA-256 hash of the file, computed locally, then recorded on a public ledger.
A SHA-256 hash is a fixed-length fingerprint produced by a deterministic algorithm. Change a single pixel in a photograph, a single character in a report, and the entire hash changes. If a document produces the same hash today that it produced at anchoring, the file hasn’t changed. That’s not an assertion. It’s a mathematical property.
ProofLedger anchors each hash to two chains: Polygon for confirmation within seconds, and Bitcoin for proof-of-work permanence on the oldest running decentralized network. The timestamp that comes back isn’t stored on any server either party controls. It’s on a public ledger, and once it’s there, it doesn’t move.
How This Holds Up in Court
The authentication argument under federal rules runs through FRE 901(b)(9), which allows courts to authenticate evidence produced by “a process or system that produces an accurate result.” You’re not asking the court to trust a metadata field. You’re asking it to trust a cryptographic process that’s independently verifiable by anyone with the hash and a blockchain explorer.
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For claims teams working at volume, FRE 902(13) is the practical rule. It covers machine-generated records authenticated through written certification, without live expert testimony. Scheduling a forensic specialist for every disputed timeline adds cost and delay. A certification under 902(13) changes when you actually need someone on the stand.
These aren’t untested theories. Both rules were added to the Federal Rules of Evidence in 2017 specifically because courts needed a workable framework for modern digital records. The gap they were written to close is exactly the gap file metadata can’t fill.
The Pre-Loss Problem
The entire value of a blockchain timestamp depends on timing. Post-loss anchoring proves a file existed after the anchor date. That’s occasionally useful, but it doesn’t establish what the file captured or when the conditions in it were present.
Pre-loss anchoring is the use case that changes the math on a coverage dispute.
A risk manager who anchors site inspection photos at the time of inspection creates a blockchain record that predates any future claim. A public adjuster who anchors scene documentation before remediation starts has a record nobody can argue was created after the fact. A contractor who anchors project-close photos has documentation dated by the blockchain, not by a file system.
ProofLedger organizes files into evidence packs by case, claim, or matter, with pre-loss and post-loss indicators on each item. During discovery, that structure makes the timeline readable without reconstructing it from individual file dates. The chain of custody is already there.
One Workflow Change
The distinction between pre-loss and post-loss documentation is often the dispute itself. Once a claim is filed, both sides are looking at the same gap, and the only question is who has independent evidence of when theirs was created.
Standard file metadata doesn’t provide that. Blockchain anchoring does.
The workflow is the same either way: photograph, document, file. The only difference is whether anchoring happens when the file is created, or the timeline gets reconstructed months later under adversarial conditions.
For risk managers, public adjusters, and attorneys who handle disputed timelines, the Monday morning version is simple: anchor documentation at the time it’s created. Not when it becomes relevant. Not when the claim arrives. Before any of that exists.
The timestamp that holds up is the one that was created before anyone knew it would need to.
