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How?
Use the worksheet alongside the original records; use an official form where required.
Fill in
By making a receipt you agree to the Terms and Privacy Policy. The Bitcoin record is permanent.
temperature log
Keep the readings before the export can change.
Temperature log — Keep the readings before the export can change. Download a free printable worksheet or CSV. Keep raw sensor exports and date each saved copy.
Your photos and files stay on your device, so keep them.
Your free temperature log.
Keep the original source records alongside this supplementary worksheet.
- Date
- Time
- Temperature / units
- Initials
Check your regulator's own form. The printable version lists the source behind every field. CSV versions have an instruction row above the headings.
Then date your filled-in copy.
Keep the completed copy and its source records. A time receipt dates those exact bytes; it does not establish that an entry is true or accepted. Save a new copy daily.
Your record, one step at a time.
Your photos and files stay on your device, so keep them.
Local preview: files are fingerprinted here. Notes and progress stay in this browser. Keep downloaded copies; browser storage is not a backup.
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How?
Add the exact original files for this part of the record. Keep them unchanged; a different export or edit has a different fingerprint.
Add link and screenshots
The link is recorded, not fetched or verified.
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How?
Record the date, time, place and who you spoke to. New notes are saved separately rather than editing an old note.
How to keep notes that hold upWrite it down
By making a receipt you agree to the Terms and Privacy Policy. The Bitcoin record is permanent.
By making a receipt you agree to the Terms and Privacy Policy. The Bitcoin record is permanent.
How to keep notes that hold up
Write notes as soon as you can. Keep the original account rather than replacing it later; the venue decides what weight it gets.
- Write it down straight away, on paper or in the box on a step.
- Put the date, time and place at the top, and who you spoke to.
- Use their words where you can; separate what you saw from what you were told.
- Sign or initial a paper note, photograph it and add the photo.
- Never edit an old note. Add a new dated entry when something changes. A device save time is not independent time evidence or proof of event order.
Temperature log
Temperature log
01 · Keep the exact files
Export the raw sensor log, rather than only a screenshot. Keep calibration and corrective-action records alongside it.
Records to keep: Log export
Temperature log
02 · Date the file’s code
Your device fingerprints the selected file or manifest. Dated follows an independent timestamp; Permanent follows Bitcoin anchoring.
An independent time, tied to the exact bytes.
Temperature log
03 · Keep the evidence
Keep daily exports and their receipts. Investigate missing exports in your own monitoring system.
Keep the originals too. A changed or compressed copy has a different fingerprint.
Try a file. It stays here.
Make a test receipt on this device.
By making a receipt you agree to the Terms and Privacy Policy. The Bitcoin record is permanent.
or drop a file here
Real cases: why records made at the time matter.
Real cases where dated records mattered. We don’t claim a time receipt would have changed the result.
United States · 2025
Check warm readings and act on them
A lab fridge stayed too warm for more than a day. The lab did not spot or look into the problem. The regulator sent a warning letter and urged outside checks; further action was only a warning.
Regulator's warning letter; possible seizure or court action was a warning, not a reported completed action.
Summarized on Oct 29, 2026
Read the letter ›United States · 2026
Keep heat records for each storage area
A report says a drug warehouse's heat logs showed readings above the allowed limits. A warning letter called for checks of all storage areas and risks. It did not find that all goods were damaged.
This account comes from a secondary summary of the warning letter.
Summarized on Oct 29, 2026
Read the report ›Related cases
What courts, schemes and regulators say.
Positions below refer to the cited rule or record type, not endorsement of Timevolt. This service is not represented as an eIDAS qualified timestamp provider. A non-qualified timestamp does not receive the qualified timestamp presumption.
FDA, FSMA preventive controls records
21 CFR 117.305: Covered records must be accurate, indelible, legible and created concurrently, and include the date, the time when appropriate, and the performer’s signature or initials. of the person performing the activity; electronic records allowed, and exempt from Part 11 when kept only to satisfy Part 117.
The rule allows electronic records and requires dates and initials but says nothing about third-party timestamps. A receipt is supporting evidence, not a substitute for concurrent, signed monitoring records.
Source summary as of 2026-10-28. Check the current source and applicable local rules.
Read the sourceHigh Court (Commercial Court)
The 2025 KLM ruling turned on expert reading of temperature data; the summary states no rule on timestamps.
Courts weigh evidence case by case; the summary does not address timestamp proof.
Source summary as of 2026-10-28. Check the current source and applicable local rules.
Read the sourceOther ways to do this
Prices change. Check each provider’s site for current prices and service details.
Related workflows.
Proves / Doesn’t prove
Proves
A completed time receipt shows that the exact selected file existed by the independently witnessed time. You can check whether a later copy has the same bytes. It does not establish creation time, authorship, identity, event order, location or the truth of the contents.
Doesn’t prove
It does not prove the sensor was accurate, calibrated or correctly placed, who recorded the readings, or that the product stayed in range. A log faked before it was receipted would still get a receipt.
A receipt cannot establish sensor accuracy, calibration, placement or completeness. A false log can still be dated.
These are the bounds of a completed proof. The local tester does not establish any time. The chosen court, scheme or regulator decides what to accept.
Questions, answered plainly.
Your file stays on your device. During normal receipt creation, your device sends a randomized code made from its fingerprint, plus encrypted recovery data. It doesn't send the plain fingerprint or the random value that opens the code. Keep the original file and the complete receipt for checking. Privacy Policy.
What does a time receipt for a temperature log actually prove?
A completed time receipt shows that the exact selected file existed by the independently witnessed time. You can check whether a later copy has the same bytes. It does not establish creation time, authorship, identity, event order, location or the truth of the contents.
Does it prove the temperature was safe?
No. It does not prove the sensor was right, where it sat, or that the product stayed in range. It only dates the file.
Is my log uploaded?
Your file stays on your device. During normal receipt creation, your device sends a randomized code made from its fingerprint, plus encrypted recovery data. It doesn't send the plain fingerprint or the random value that opens the code. Keep the original file and the complete receipt for checking.
Will FDA or an auditor accept it?
We found no FDA rule that addresses it either way. Food records still need date, time and initials under 21 CFR 117.305, and a receipt is extra support.
Source summary as of October 30, 2026. Check the current source and its scope.
Context for this answerWhat should I put in it: a screenshot or the raw export?
Use the raw export your logger or software produces. A receipt on a screenshot only proves the screenshot.
Can it help with a carrier or insurance dispute over spoiled goods?
A completed time receipt shows that the exact selected file existed by the independently witnessed time. You can check whether a later copy has the same bytes. It does not establish creation time, authorship, identity, event order, location or the truth of the contents. Keep original source records, native entry history and separate process evidence; a time receipt does not continuously monitor the file.
Source summary as of October 30, 2026. Check the current source and its scope.
Context for this answerDo I need one receipt a day?
Choose an export schedule that fits your recordkeeping needs. Each completed receipt shows that its exact file existed by an independent time. It does not establish when entries were made or that a week was not backfilled. Check gaps, entry history and completeness in the source logging system separately.
What does it cost?
See the Pricing page for current US-dollar plans and allowances. Fast is paused. Purchases open when receipts open.
Source summary as of October 30, 2026. Check the current source and its scope.
Context for this answerThe file tester runs on your device. It does not issue a timestamp or take a payment.
Keep the records you already have.
Keep your original files and any existing official records while the receipt service is being prepared.