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Timevolt / Change order
Construction

Keep the exact change order and drawing set together.

Keep the exact change order and drawing set together. Keep your original source records together, then date the exact files. It does not prove agreement, authority, required notice, receipt, performance, payment entitlement or the legal meaning of a release.

Try a file locally

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

EXAMPLE
Change order
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?

    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.
        Change order
        Change order

        01 · Keep the exact files

        Keep the original files for change order. Include any existing photos, signed records and source-system exports.

        Records to keep: Change order · Drawings

        Change order

        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.

        Change order

        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.

        US federal procurement · 1962

        Keep the accepted copy of a change order

        A contractor said a change order settled the price, but no signature or other acceptance was shown. The sums also had serious errors. The reviewer allowed a price fix rather than treating the order as a binding deal.

        Summarized on Oct 29, 2026

        Read the source ›
        US federal construction · 2009

        Read the release wording in each change

        A contractor's signed changes gave up some later claims for delay and combined effects. The appeal court found the wording clear. It kept part of the ruling but sent other parts back to identify claims outside those releases.

        Summarized on Oct 29, 2026

        Read the source ›

        Related cases

        US federal contracts · 2015

        Internal records do not send a required notice

        Related: notice of changed contract work

        A contractor sought more pay for changed work but missed the contract's written-notice step while changes occurred. Adequate notice came years later. The appeal court kept the ruling against that change claim.

        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 · US federal contracts incorporating the clause

        Federal Acquisition Regulation contract administration

        FAR 52.243-4 Changes

        The clause addresses written change orders and specified written notice for other directions treated as changes. A receipt does not supply contractual notice or contracting-officer authority.

        Source summary as of 2026-10-28. Check the current source and applicable local rules.

        Read the source
        Needs something else · California state highway construction

        Caltrans contract administration

        Construction Manual section 5-3 Change Orders

        The manual addresses documented analysis and appropriate approval of changes. A dated package supplements records and does not approve a change or establish entitlement.

        Source summary as of 2026-10-28. 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.

        • Procore change orders

          Provides construction change-order creation, tracking, approvals and communication integrated with project finances.

          Visit site

        • Autodesk Forma change-order tracking

          Tracks change sources, scope and cost impacts, with approval workflows and documentation packages.

          Visit site

        • Controlled manual change-order file

          Keeps calculations, authorizations and construction change records together.

          Visit site

        Related workflows.

        Site progress photosQuarterly 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 meeting

        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 agreement, authority, required notice, receipt, performance, payment entitlement or the legal meaning of a release.

        It does not prove agreement, authority, required notice, receipt, performance, payment entitlement or the legal meaning of a release.

        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 a date receipt the same as an approved change?

        No. Caltrans requires its documented analysis and approval process; a file date supplies neither authorization nor agreement.

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

        Context for this answer
        What belongs beside a change order?

        In the Caltrans process, the supporting analysis, calculations and time-adjustment records explain the change alongside its approved documentation.

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

        Context for this answer
        Does keeping a file provide contractual notice?

        No. The cited FAR clause requires specified written notice to the contracting officer for certain directions treated as changes.

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

        Context for this answer
        Why keep the exact signed version?

        The 2009 Federal Circuit decision turned on release wording in signed modifications. A summary or later draft may omit the wording that mattered.

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

        Context for this answer
        Can an unsigned copy establish acceptance?

        It may leave an evidential gap. In the cited Comptroller General decision, contractor signature or other acceptance was not established from the agency record.

        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.