Logistics

Preserve a courier custody log with the package identifier, seal checks and original handoff records.

Preserve a courier custody log with the package identifier, seal checks and original handoff records. Keep your original source records together, then date the exact files. It does not establish physical custody, an intact seal, the contents of a package, a person's identity, or actual dispatch or delivery.

Try a file locally

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

EXAMPLE

Courier chain of custody for sealed documents, samples or valuables

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

Keep your photos and files unedited. The receipt only matches the originals. Put them in an album such as “My records”.
Save this receipt to your camera roll.
Keep the receipt file too. The image is a handy copy; checking needs the file.
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.

1. Original files for this record0 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 files

Add link and screenshots

Link to recordAdd screenshots

The link is recorded, not fetched or verified.

2. Write down anything you need to remember0 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

New note

By making a receipt you agree to the Terms and Privacy Policy. The Bitcoin record is permanent.

Photo of note

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.

Courier chain of custody for sealed documents, samples or valuables

01 · Keep the exact files

Keep the original files for courier chain of custody for sealed documents, samples or valuables. Include any existing photos, signed records and source-system exports.

Records to keep: Existing capture-system and sign-off records

Courier chain of custody for sealed documents, samples or valuables

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.

Courier chain of custody for sealed documents, samples or valuables

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.

Choose a file

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 — Eleventh Circuit · 1990

Changing a shipping copy did not limit payment

A courier lost a blood shipment and disputed how much it owed under the shipping form. Its later change to an accounting copy had no effect. The appeal court kept the shipper's win under the historical rules at issue.

Summarized on Oct 29, 2026

Read the source ›

US federal — Eleventh Circuit · 1994

A sealed form may not need transport signatures

A private case reviewer excluded a drug test because transport staff had not signed a form sealed inside its box. The appeal court rejected that reading of the rules then in force. It overturned the order to restore the worker's job and sent the case back.

Summarized on Oct 29, 2026

Read the source ›

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.

Needs something else · US federal — DOT-regulated drug testing

US Department of Transportation

49 CFR 40.79

The collection workflow requires the custody form, collection date and time, collector certification, delivery service and sealed shipment. Those operational steps cannot be replaced with a timestamp.

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

Read the source

Needs something else · US federal — DOT-regulated drug testing

US Department of Transportation

49 CFR 40.83

Laboratories inspect specimens and forms for specified flaws including mismatched identifiers and broken seals; the prescribed response depends on the defect. An external receipt does not cure it.

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

Read the source

Needs something else · United States — USPS eligible signature mail

US Postal Service

Proof of Delivery service guidance

USPS supplies its own delivery information and signature record for eligible services. The guidance does not recognize a third-party file timestamp as proof of postal delivery.

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.

USPS signature and delivery services
Provides carrier-generated mailing and delivery records.
Visit site
Criterion laboratory custody forms
Provides the receiving laboratory's custody form.
Visit site
DOT paper custody and control workflow
Records specimen identifiers, seals and transfer information.
Visit site

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 establish physical custody, an intact seal, the contents of a package, a person's identity, or actual dispatch or delivery.

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 file time receipt proof of courier delivery?

No. A carrier's own delivery record describes the event it recorded; a file receipt dates bytes. Keep the original carrier record and relevant shipment details.