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Timevolt / Course checkpoint and timing records
Races / sports

Marathon split record: preserve the original timing export and checkpoint evidence.

Marathon split record: preserve the original timing export and checkpoint evidence. Keep your original source records together, then date the exact files. It does not establish origin, identity, truth, physical events, sending, delivery, agreement, acceptance or the outcome of a dispute.

Try a file locally

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

EXAMPLE
Course checkpoint and timing records
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.
      Course checkpoint and timing records
      Course checkpoint and timing records

      01 · Keep the exact files

      Keep the original files for course checkpoint and timing records. Include any existing photos, signed records and source-system exports.

      Records to keep: Chained checkpoint receipts with window times and finish badge

      Course checkpoint and timing records

      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.

      Course checkpoint and timing records

      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

      Related cases

      Related cases from nearby fields. We don’t claim a time receipt would have changed the result.

      United Kingdom; UK Athletics sanctioned ultramarathon · 2023

      A car ride can bring race penalties

      Related: ultramarathon conduct and witness accounts

      A runner owned up to a car ride but denied hiding it or trying to cheat. The panel set a year ban on UKA-rules events, British national teams and coach, official or manager roles. The ruling could be appealed; no later result was checked.

      Summarized on Oct 29, 2026

      Read the source ›
      South Africa, organizer race process · 2024

      Entry checks can expose false race credentials

      Related: race entry and completion checks

      A race body said it rejected some 2024 entries for cheating in its 2023 race or in qualifying. It listed false times, stand-in runners, number misuse, shared runs and shortcuts. No full hearing for each runner or later appeal result was checked.

      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; Boston Marathon qualifying-event policy, current 2027 page

      Boston Athletic Association

      Qualifying times require a certified full marathon and verification; policy describes transponder timing or recorded 5K check sheets supplemented with video where no transponder system is used.

      These are organizer-specific evidence and event requirements. A personal timestamp is not an accepted qualifying result or course certification; meeting a time standard does not guarantee entry.

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

      Read the source
      Needs something else · United Kingdom; current London Marathon entry conditions viewed October 29 2026

      London Marathon Events

      Participation is personal, another person must not use the bib, and course completion before the official cutoff affects medals/results.

      Bib/timing records do not themselves prove the wearer's identity or compliance. Conditions contain event-specific sanctions; no independent timestamp acceptance stated.

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

      Read the source
      Unclear · United States; Chicago Marathon course information

      Chicago Marathon

      Official page describes checkpoint split recording and possible photographic support for enforcement; personal device distance may differ from official markers.

      Current page has 2027 banner alongside a 2026 course map and 2026-specific logistics. Use only the described workflow, not future checkpoint guarantees or a date-specific cutoff.

      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.

      • RACE RESULT

        Provides race timing and scoring systems.

        Visit site

      • RaceSplitter

        Records split and lap times and publishes results.

        Visit site

      • MYLAPS

        Provides automated sports-timing product.

        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 establish origin, identity, truth, physical events, sending, delivery, agreement, acceptance or the outcome of a dispute.

      It does not establish origin, identity, truth, physical events, sending, delivery, agreement, acceptance or the outcome of a dispute.

      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.

      Does a qualifying time automatically secure a Boston place?

      No. The BAA page separately requires verification and says reaching a standard does not guarantee entry.

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

      Context for this answer
      Can an official qualifying event use check sheets?

      The BAA's current policy describes recorded 5K check sheets supplemented with video where the course is not timed with a transponder system.

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

      Context for this answer
      Does a missing split automatically settle whether someone cheated?

      No such universal rule was established here. RACE RESULT documentation describes missed or unexpected reads causing calculation errors in specific algorithms.

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

      Context for this answer
      Does a personal watch distance replace the official course?

      Chicago's page says personal-device distance can differ from the official markers.

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

      Context for this answer
      Does a dated bib record establish who wore it?

      No. London's conditions make participation personal and forbid another person wearing the number; file dating cannot establish compliance with that condition.

      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.