A construction defect claim lands on your desk three years after completion. The contractor insists the photos showing water damage were taken after the storm, not before. The metadata says March 15th, but timestamps can be altered with a few clicks. You need proof the evidence existed before the loss date.
This is where blockchain evidence timestamping becomes critical. ProofLedger anchors SHA-256 file hashes to both Polygon and Bitcoin blockchains, creating immutable proof that evidence existed at a specific point in time. The blockchain doesn't lie about when something was recorded.
Here's the workflow that matters for claims professionals. When evidence is first documented, ProofLedger generates a cryptographic hash of the file and anchors it to the blockchain within seconds on Polygon, then again in daily Bitcoin batches. The file itself never leaves your system. Only the hash gets recorded on the public ledger.
Later, when the claim becomes disputed, you can prove temporal integrity. Upload the evidence file to ProofLedger's verification system. If the file hasn't been altered, it generates the same SHA-256 hash. That hash either matches what's anchored on the blockchain or it doesn't. If it matches, you can prove the evidence existed exactly as recorded on the anchor date.
Courts can authenticate blockchain timestamps under FRE 901(b)(9) as evidence from a process that produces an accurate result. The foundation requires showing that blockchain consensus mechanisms create reliable timestamps through distributed verification. Expert testimony or written certification can establish this foundation, but the underlying technology provides the temporal proof.
The dual-chain approach strengthens admissibility. Polygon provides instant confirmation with sub-second finality. Bitcoin adds long-term security through proof-of-work consensus and global distribution. An attacker would need to control 51% of Bitcoin's network to alter timestamps retroactively. The economic cost makes this effectively impossible.
For insurance carriers, this solves the fundamental evidence authentication problem. Photos, videos, documents, sensor readings, drone footage, property inspections can all be timestamped at the moment of creation. When a claim emerges months or years later, the blockchain anchor proves the evidence predates the dispute.
Consider a property damage claim where the insured submits photos allegedly showing pre-existing conditions. Without temporal verification, it's difficult to prove whether those photos were actually taken before the policy inception date or after the loss occurred. Blockchain anchoring creates an immutable record that settles the timing question definitively.
The verification process is straightforward. Upload the evidence file to check its hash against blockchain records. The system returns a verification report showing the exact timestamp when that specific version of the file was anchored. If someone altered the evidence after anchoring, the hash won't match, and verification fails.
Evidence packs organize related documentation by claim or case file. Each item gets its own blockchain anchor with clear pre-loss or post-loss indicators based on the anchor date relative to the reported loss date. This creates a complete chain of custody that courts can verify independently through public blockchain explorers.
Neutral temporal authority matters when millions are at stake. The blockchain provides that authority without relying on any single party's testimony about when evidence was created.