Cold storage
Map every freezer, cooler and zone. Threshold breaches alert the right team before product is at risk.
Our coverage
Monitoring that follows the product, not the building.
Wireless loggers report temperature, humidity, shock and light at every leg — and FahCel chains each reading so the history can't be quietly rewritten.
In transit
Loggers ride with the pallet across handoffs, logging location, jolts and door-open events the whole way.
Retail & last mile
Hand stores and inspectors a verifiable record of the journey — no clipboards, no gaps, no disputes.
chain intact · 4,210 readings
verifyChain() → valid: true
Tamper-evident by design
Every reading is sealed into a hash chain.
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01Linked records. Each reading hashes the one before it, so altering history breaks the chain.
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02Deterministic. Canonical JSON means anyone can recompute the proof and get the same result.
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One-click verify. Walk the entire chain and pinpoint the first reading that was touched.
Why FahCel
Built for the people who sign off on safety.
Quality leads, logistics ops and auditors work from one record — fewer spreadsheets, faster sign-off, defensible proof.
Inspection-ready in seconds
Export a signed PDF of any shipment's full temperature history, complete with the integrity check result.
Catch excursions live
Threshold and door-open alerts hit your phone the moment a reading drifts — not at the next manual check.
End the finger-pointing
When a load is rejected, the chain shows exactly where and when cold was lost — and who was holding it.
FAQ
Questions from the people who sign off.
Straight answers on how the chain works, what FahCel monitors, and how the record holds up in an audit.
What is cold-chain integrity?
Cold-chain integrity is proof that a perishable product stayed within its required temperature range at every stage — storage, transit and last mile. FahCel establishes it by recording each logger reading and sealing it into a tamper-evident hash chain, so the history can be verified rather than trusted.
How does a hash chain prove temperature wasn't altered?
Each reading is hashed together with the hash of the reading before it, forming a linked chain. Changing any past value changes its hash, which breaks every link after it. Anyone can recompute the chain from canonical JSON and pinpoint the first reading that was touched.
What does FahCel monitor?
Wireless loggers report temperature, humidity, shock and light, plus GPS location and door-open events in transit. FahCel covers the full journey — cold storage, in-transit handoffs and retail last mile — and chains every reading so the record follows the product, not the building.
What happens when a reading breaches the threshold?
A threshold or door-open alert hits the responsible team's phone the moment a reading drifts out of range — not at the next manual check. The excursion is recorded in the chain with its timestamp, so the event is both actionable in the moment and provable afterward.
Is the record audit-ready?
Yes. You can export a signed PDF of any shipment's full temperature history together with the chain-integrity check result. Quality leads, logistics ops and auditors work from one verifiable record, which replaces clipboards and spreadsheets and shortens sign-off.
Prove your cold chain held.
See FahCel running on a live shipment — loggers, alerts and a verifiable hash chain — in a 20-minute walkthrough.