Business

Preserve the exact invoice version beside independent transmission records; its time receipt does not prove sending or receipt.

Preserve the exact invoice version beside independent transmission records; its time receipt does not prove sending or receipt. Keep your original source records together, then date the exact files. It does not prove identity, origin, truth, location, sending, delivery, consent, authorization, completeness, rights, acceptance or outcome.

Try a file locally

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

EXAMPLE

Invoice as sent

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. Invoice0 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.

Invoice as sent

01 · Keep the exact files

Keep the original files for invoice as sent. Include any existing photos, signed records and source-system exports.

Records to keep: Invoice

Invoice as sent

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.

Invoice as sent

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.

United States New York · 2025

Invoices and part payments can support a balance

A seller used bills and part payments to show what was still owed. The court awarded payment without needing the disputed emails. Other contract claims and the buyer's claims against the seller stayed open.

Summarized on Oct 29, 2026

Read the source ›

United States New York · 2025

Sending bills does not settle disputed agreement

A firm won early on unpaid bills, but its client showed objections and a big jump from old prices. The court reopened the case because the deal, price and timely objections stayed disputed. More evidence had still to be gathered.

Summarized on Oct 29, 2026

Read the source ›

United States New York · 2024

Objections can leave invoice balances unsettled

Two firms disputed jewelry prices, emailed bills and objections. The court refused an early win for the seller and let other claims go on. A second claim for value received was closed as a repeat of another 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 · United Kingdom VAT electronic invoicing

HMRC VAT Notice 700/63 current served guidance

Electronic invoice records require authenticity of origin, integrity and legibility, and appropriate transmission/storage controls and a supply audit trail.

Current served notice last updated 26 May 2022; a hash alone proves no supplier identity, customer agreement, supply or tax compliance. No tax advice.

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

Read the source

Needs something else · United Kingdom intended VAT e-invoicing reform

Government implementation roadmap publishedOctober 2026

Roadmap describes intended structured VAT e-invoicing from 1 April 2029, with full scope/standards and legislation still to follow; plain PDFs/images are not structured e-invoices under its definition.

Future roadmap, not an operative 2026 mandate or a Timevolt certification. Current notice and future technical definitions kept distinct.

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

Read the source

Needs something else · United States postal service

USPS extra-service descriptions

Certificate of Mailing concerns presentation to USPS; Certified Mail and optional Return Receipt supply defined mailing/delivery records.

Actual postal events required, not a date on local invoice bytes; contents and debt still separate.

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.

InvoiceSonic
Sends invoices and records opens/reminders.
Visit site
Xero invoicing
Provides invoice creation, transmission, open status and paid status within accounting workflow.
Visit site
USPS mailing record
Provides postal acceptance and delivery records.
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 prove identity, origin, truth, location, sending, delivery, consent, authorization, completeness, rights, acceptance or 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.

Does dating an invoice prove I sent it?

No. USPS distinguishes actual mailing and delivery records; a local receipt dates a copy only.