The Timestamp Problem
When you capture digital evidence, one of the first questions a court will ask is: "When was this captured?"
Traditional timestamps (file creation dates, EXIF data, system clocks) are trivially manipulable. Anyone can change their computer's clock before saving a file, or modify file metadata after the fact. This makes self-reported timestamps unreliable for legal purposes.
What Is Blockchain Anchoring?
Blockchain anchoring (also called "blockchain timestamping") is the process of writing a piece of data — in our case, an evidence hash — to a public blockchain. Once recorded, this entry becomes:
- Immutable — It cannot be altered or deleted by anyone
- Timestamped — The block's timestamp is consensus-verified by the network
- Publicly verifiable — Anyone can independently confirm the record exists
How TrueSnap Uses Polygon Blockchain
TrueSnap anchors evidence hashes to the Polygon blockchain (a proven Ethereum Layer 2 network). Here's the process:
- Evidence is captured and packaged
- SHA-256 hash of the complete package is computed
- A transaction containing this hash is submitted to Polygon
- The transaction is included in a block with a consensus timestamp
- The transaction hash (TX ID) is recorded in your evidence metadata
Why Polygon?
| Factor | Polygon | Bitcoin | Ethereum L1 |
|---|---|---|---|
| Transaction cost | < $0.01 | $1-50+ | $5-100+ |
| Confirmation time | ~2 seconds | ~10 minutes | ~15 seconds |
| Environmental impact | Proof of Stake (low) | Proof of Work (high) | Proof of Stake (low) |
| Public verifiability | Yes | Yes | Yes |
| Long-term reliability | High (EVM ecosystem) | Very High | Very High |
Verifying a Blockchain Timestamp
Anyone — including opposing counsel, judges, or expert witnesses — can verify the timestamp:
- Get the transaction hash from the evidence metadata
- Look it up on Polygonscan.com
- Read the transaction data — it contains the SHA-256 hash of the evidence
- Check the block timestamp — this is when the evidence hash was permanently recorded
What this proves:
- The evidence existed in its current form at or before the block timestamp
- The evidence has not been modified since that timestamp (hash would change)
- No one — not even TrueSnap — can alter or remove this record
Legal Significance
Blockchain timestamps address a key evidentiary challenge: proving that evidence existed at a specific point in time without relying on any single party's trustworthiness.
Traditional timestamp problems solved:
| Problem | Traditional | Blockchain |
|---|---|---|
| Clock manipulation | User controls system time | Network consensus determines time |
| Record alteration | Database can be modified | Immutable once confirmed |
| Single point of trust | Must trust the recording party | Trustless verification |
| Long-term availability | Server may shut down | Blockchain persists indefinitely |
Common Questions
Is blockchain evidence accepted by courts?
Increasingly, yes. Courts in the US, EU, UK, China, and other jurisdictions have accepted blockchain timestamps as evidence of existence and timing. The EU's eIDAS regulation explicitly recognizes qualified electronic timestamps, and blockchain-based timestamps are gaining recognition under this framework.
What if Polygon shuts down?
Polygon is an established network with significant economic value securing it. However, even in a theoretical shutdown scenario, blockchain data is distributed across thousands of nodes worldwide. Historical data remains accessible through archives and other network participants.
Does this prove the content is TRUE?
No. Blockchain anchoring proves when evidence was captured and that it hasn't been modified. It does not make claims about the truthfulness of the captured content itself — that remains a matter for the court to evaluate.
Can someone anchor fabricated evidence?
They could anchor a hash of anything. But TrueSnap's evidence packages include network traffic logs, TLS certificates, and DOM snapshots that independently corroborate the content's origin. The blockchain timestamp is one layer in a multi-layered verification system.
The Complete Chain
Web page exists → TrueSnap captures it → Hash computed → Hash anchored to blockchain
↓
Months/years later: Hash still matches → Evidence proven intact
Timestamp on chain → Time of capture proven
Blockchain anchoring transforms "I captured this at 3:00 PM on June 1st" from an unverifiable claim into a mathematically and cryptographically proven fact.