Subrogation Evidence Doesn't Fail at Trial. It Fails at Day One.
Subrogation investigators are good at finding records. The challenge is proving when those records were created.
A typical recovery starts months after the original loss. The field adjuster has moved on. Photos exist in the claim file, notes were taken, damage assessed. That documentation may be completely accurate. But when opposing counsel challenges the timing of when it was created, those accurate records suddenly need to survive a provenance argument nobody built them for.
"After the fact" is the phrase that surfaces in these disputes. In subrogation, the gap between "we have the evidence" and "we can prove when this evidence was created" is where recoveries stall.
Authentication and the EXIF Problem
An adjuster photographs water damage on day one. The EXIF metadata says Thursday at 2:47 PM. That timestamp is inside the file. It can be changed. A modified file looks identical to the original, and the opposing party doesn't need to prove tampering occurred. They need to raise a reasonable question about timing, and the burden shifts.
Under FRE 901(b)(9), courts authenticate digital evidence based on the process that produced it. The rule requires showing that the process or system generates an accurate result. I'd argue EXIF metadata has never reliably met that standard. The timestamp is in the file, and the file can be altered. There's no independent verifiable process external to the document being authenticated.
A blockchain anchor is different. It records the hash of the document at a specific moment on a public ledger that no single party controls. That ledger is the verifiable process. The distinction matters in discovery: "the metadata says this was created Thursday" is a claim that depends on trusting the file. "The blockchain record confirms this hash was anchored at block X on Thursday" is a claim any party can verify against a public ledger themselves.
Why Subrogation Creates This Gap
Most claims have one investigation timeline. Subrogation layers a second one on top.
The adjuster who documented day one wasn't thinking about a potential third-party recovery. The photos were for the claim file, the notes for the carrier's records. When a subrogation team identifies a recovery opportunity months later, they inherit that documentation. Good work, right timing, no anchor.
By the time the case is being built, the at-capture moment is already in the past. What exists is documentation created at the right time but without independent timing verification. Accurate records with uncertain provenance.
That handoff is where problems develop. Records created by one team, reviewed by another, challenged by opposing counsel in discovery. The original adjuster may no longer be accessible. Their field notes may be accurate in every detail. But file modification dates on their photos may not survive a credible challenge in discovery. Good-faith work, no independent timestamp.
The opposing party doesn't need to allege fraud. They question when the records were created. The file's own metadata isn't an independent source, and that's enough to work with.
This isn't a pattern driven by bad actors. It's a documentation discipline gap that surfaces in good-faith recoveries because nobody anchored the field work before a recovery was on the table.
What At-Capture Anchoring Does
Anchoring at capture means the timing proof exists independently of the file. A SHA-256 hash of the document goes on-chain at the moment of creation. The file never leaves the adjuster's machine. The hash does. And the hash, once anchored, creates a permanent record that a specific document existed at a specific moment, independent of the file's own metadata.
ProofLedger anchors to both Polygon and Bitcoin. Polygon confirms the anchor immediately. Bitcoin anchors in a daily batch with a merkle proof that ties the hash to a specific block. When opposing counsel wants to challenge documentation timing, they can verify either chain themselves using a public block explorer. Nothing proprietary to trust.
Under FRE 902(13), machine-generated records can be self-authenticated through written certification without live expert testimony. An anchored record can be positioned for that path. An unanchored file can't, because the only timestamp is a metadata field inside the document itself.
What Changes Monday
Subrogation teams reviewing documentation practices should ask one question: if opposing counsel challenges the timing of our field documentation in discovery, what's the response?
A file modification date isn't an answer. EXIF metadata isn't an answer. A blockchain anchor is, because it's permanently recorded on a public ledger and independently verifiable by any party.
If documentation already exists without anchoring, you work with what you have. The argument from that point runs on authenticity through other means, which is harder. The sustainable path is anchoring at capture, before there's any indication of subrogation potential. Because by the time the recovery is identified, the at-capture moment is already in the past.
Anchor before the loss, not after. Risk documentation, not claim documentation.
Has your team had a subrogation recovery challenged specifically on documentation timing, where the underlying records were accurate but when they were created couldn't be independently verified?