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Timevolt / Forecast or warning issued before the event
Weather / risk services

Preserve the exact forecast version and separate its issue, valid and delivery times.

Preserve the exact forecast version and separate its issue, valid and delivery times. Keep your original source records together, then date the exact files. It does not prove identity, authorship, truth, location, sending, receipt, consent, approval, completeness, rights or the outcome.

Try a file locally

Your photos and files stay on your device, so keep them.

EXAMPLE
Forecast or warning issued before the event
1 Nov 2026
Authority time: 14:02 UTC · example
Bitcoin block time: 14:10 UTC · example
Last checked: 15:02 UTC · example
✓ Dated◆ Permanent
Now keep it safe: three things
  1. Keep your photos and files unedited. The receipt only matches the originals. Put them in an album such as “My records”.
  2. Save this receipt to your camera roll.

    Keep the receipt file too. The image is a handy copy; checking needs the file.

  3. Email it to yourself.Email it to myself

    Your mail app opens a draft. Attach your receipt image and receipt file. Don’t attach your photos or documents. Timevolt does not send it or know whether it was sent.

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.

0 items
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.

    0 items
    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 up
    Write 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.

      1. Write it down straight away, on paper or in the box on a step.
      2. Put the date, time and place at the top, and who you spoke to.
      3. Use their words where you can; separate what you saw from what you were told.
      4. Sign or initial a paper note, photograph it and add the photo.
      5. 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.
      Forecast or warning issued before the event
      Forecast or warning issued before the event

      01 · Keep the exact files

      Keep the original files for forecast or warning issued before the event. Include any existing photos, signed records and source-system exports.

      Records to keep: Forecast bulletin PDF/JSON as sent to clients

      Forecast or warning issued before the event

      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.

      Forecast or warning issued before the event

      03 · Keep the evidence

      Keep the original files and complete receipt separately, alongside any existing venue, signature and workflow records.

      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 the saved copy matters.

      Real cases where dated records mattered. We don’t claim a time receipt would have changed the result.

      First Circuit United States · 1986

      A government win does not prove forecast accuracy

      A claim blamed US storm forecasts after buoy readings stopped reaching weather staff. The court set aside an earlier payment award because the law protected those service and spending choices. The court did not find that every forecast was right.

      Summarized on Oct 29, 2026

      Read the source ›
      Illinois United States · 1994

      A closed warning case may leave facts unresolved

      People said poor radar reading and messages delayed tornado warnings and sirens. Their cases were closed under government protections and separate rules on state duties. The court did not find that all warnings were right or on time.

      Summarized on Oct 29, 2026

      Read the source ›
      Utah United States · 2001

      Closed cases may leave warning coverage disputed

      Families blamed a government icing warning's small area and lack of updates before a crash. The court closed their cases for good because the choices were protected and no matching state-law claim was available. It did not rule that the warning was right.

      Summarized on Oct 29, 2026

      Read the source ›

      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.

      Needs something else · United States NOAA Ocean Prediction Center

      Official product FAQ

      ISSUED identifies dissemination date/time; VALID identifies the forecast period.

      Terminology for this official product family, not a rule accepting third-party timestamps. A private file receipt cannot prove actual dissemination.

      Source summary as of 2026-10-29. Check the current source and applicable local rules.

      Read the source
      Needs something else · Canada ECCC public forecasts

      Official public bulletin guide

      Title block identifies region, issue date/time and forecast periods; revisions and issue schedules have defined context and regional differences.

      Preserve actual title block and version alongside external records. No private receipt endorsement or universal issue schedule inferred.

      Source summary as of 2026-10-29. Check the current source and applicable local rules.

      Read the source

      Other ways to do this

      Prices change. Check each provider’s site for current prices and service details.

      • NOAA WPC chart archive

        Provides official day-one morning/afternoon chart issues.

        Visit site

      Related workflows.

      Quarterly user access review: the reviewer list, decisions and removals frozen as submittedAccess or license request, manager approval and grantQuarterly user access review: the list shown to the reviewer, each keep/remove decision and proof removals happenedHuman-in-the-loop approval before an AI agent executes a high-impact action (refund, payment instruction, production change, customer message)Who was physically present at a members' or condo board meetingHuman-made process record

      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 identity, authorship, truth, location, sending, receipt, consent, approval, completeness, rights or the outcome.

      It does not prove identity, authorship, truth, location, sending, receipt, consent, approval, completeness, rights or the outcome.

      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.

      Is issue time the same as valid time?

      NOAA OPC defines issue time as dissemination and valid time as when the forecast represents conditions.

      Source summary as of October 30, 2026. Check the current source and its scope.

      Context for this answer
      Does a downloaded archive prove a client got a warning?

      The NOAA definition concerns product dissemination. A private file date or later download does not establish a particular client received it.

      Source summary as of October 30, 2026. Check the current source and its scope.

      Context for this answer
      Where can issue details appear?

      The Canadian public bulletin guide describes a title block with region, issue date/time and periods.

      Source summary as of October 30, 2026. Check the current source and its scope.

      Context for this answer
      Are forecasts revised?

      The Canadian guide describes revisions when specified differences affect public safety or widespread inconvenience.

      Source summary as of October 30, 2026. Check the current source and its scope.

      Context for this answer
      Is reanalysis the original issued forecast?

      Open-Meteo distinguishes reanalysis, stitched historical forecasts and individual model runs; choose the actual relevant dataset rather than treating them as the same.

      Source summary as of October 30, 2026. Check the current source and its scope.

      Context for this answer

      The 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.