Freelancers: Never Lose a Client Dispute Again

Every year, thousands of freelancers lose money in disputes they could have won — if they had proof. ProofStamper creates certified timestamps for your deliverables, contracts, and project files in 30 seconds, for free, using the RFC 3161 international standard. Each timestamp proves the exact date your file existed, verified by an independent authority. Your file never leaves your device. It's the simplest way to protect yourself before a problem becomes a lawsuit.

You finished the project on time. You sent the files. And then the client says: "I never received it," or "This isn't what we agreed on," or worse — they use your work and refuse to pay. If you're a freelancer, you've either lived this or feared it. The good news: a simple 30-second habit before every delivery can make you virtually dispute-proof.

The 5 disputes that ruin freelancers (and how to prevent each one)

1. "I never received your deliverable"

Problem: You sent your work by email, WeTransfer, or Google Drive. The client claims they never got it — or says the files were corrupted, incomplete, or arrived after the deadline.

Why: Email delivery is not proof of receipt. File-sharing links expire. Download confirmations can be disputed.

Fix: Timestamp your deliverable files BEFORE sending them. The timestamp proves the exact files existed at the exact date — independently verified.

Deliver → Timestamp → Send. Every time. 30 seconds.

2. "That's not what we agreed on"

Problem: You delivered exactly what was described in the brief. But the client claims the scope was different or the specifications were never agreed upon.

Why: Briefs evolve through conversations. Emails get buried. Verbal agreements are impossible to prove.

Fix: Timestamp every version of the brief, quote, and scope document. You have a complete, independently dated timeline of what was agreed and when.

Before starting work, timestamp the signed brief and quote. After every scope change, timestamp the updated document.

3. "I'll use your work but I won't pay for it"

Problem: The client rejects your work, refuses to pay — and then uses it anyway. Your logo, photos, code, or copy — live on their website or product.

Why: Without proof of creation date, it's your word against theirs. The client can claim they created it independently.

Fix: Timestamp your original source files (.psd, .ai, .fig, raw photos, source code) before delivering exports. Your timestamp proves you had the source files first.

Timestamp source files at each major milestone. Timestamp final exports before delivery.

4. "Another freelancer did this first"

Problem: You created an original design or concept. Later, someone else claims credit for identical or suspiciously similar work.

Why: Clients sometimes share your rejected concepts with other freelancers, or describe your approach to a cheaper alternative.

Fix: Timestamp your work early — not just final deliverables, but sketches, wireframes, initial concepts. A series of timestamps is far stronger than a single one.

Timestamp at every stage: concept → draft → revision → final. Build a timestamped creative timeline.

5. "The contract said something different"

Problem: You and the client signed a contract. Later, the client produces a version with different terms and claims it's the "real" version.

Why: Contracts exchanged as Word or PDF files are trivial to edit. Anyone can claim their version is the original.

Fix: Timestamp the final contract before both parties sign. After signature, timestamp the signed version. Any modification would produce a different hash and break the proof.

Contract ready → Timestamp → Sign → Timestamp signed version. Two timestamps, 60 seconds total.

The 30-second freelancer habit

The best time to create proof is before you need it.

Before every delivery

  1. Open proofstamper.com (no account needed)
  2. Drop your deliverable file(s)
  3. Download your Proof Pack
  4. Save it in your project folder
  5. Then send the deliverable to the client

Before every project

  1. Timestamp the signed brief/quote/contract
  2. Store the Proof Pack with your project files

At every milestone

  1. Timestamp your work-in-progress files
  2. Build a timestamped creative timeline

What a Proof Pack contains

PDF Certificate

A human-readable document showing: file name, SHA-256 fingerprint, certified date/time (UTC), and Timestamp Authority identity. What you'd show a client, mediator, or judge.

.tsr Cryptographic Token

The machine-verifiable proof. Independently verifiable by anyone using OpenSSL or ProofStamper's verification page. Cannot be forged or altered.

Your Original File

Never uploaded. You keep it. Together with the Proof Pack, they form a complete chain of evidence.

Real scenarios from the freelance community

"A client rejected my logo concepts, then I saw my design on their website 3 months later. I had timestamped my original .ai files the day I created them. When I showed the Proof Pack with the certified date — 2 months before their 'new' logo appeared — they settled immediately."

Graphic designer, Paris

"A client claimed I delivered the codebase 2 weeks late and withheld payment. My timestamped ZIP archive proved the code was ready on the agreed date. The mediation was over in one meeting."

Web developer, Berlin

"Someone was selling prints of my photo on a stock platform. I had timestamped my original RAW file the day of the shoot. The platform removed the infringing listing within 48 hours after I provided my Proof Pack."

Photographer, Tokyo

How much does a dispute cost vs. a timestamp?

Without proofWith ProofStamper
Client refuses to pay $3,000 invoiceNo leverage. Legal action costs more than the invoice. You write it off.Proof Pack proves delivery date. Most clients back down immediately.
Someone copies your designCan't prove you had it first. "He said, she said."Timestamped source files prove prior creation. File DMCA takedown with evidence.
Contract disputeYour version vs. theirs. Mediation is long and uncertain.Timestamped original. Hash doesn't match client's "version." Dispute resolved.
Cost of inaction$500-5,000+ lost per incident$0. Free timestamps, 30 seconds each.

Works with every freelance tool

Figma / Sketch / Adobe XD: .fig, .sketch, .xd project files
Photoshop / Illustrator / InDesign: .psd, .ai, .indd + .pdf exports
VS Code / GitHub: .zip of repository or source files
Final Cut / Premiere / DaVinci: Project files or rendered videos
Google Docs / Word / Notion: Export as .pdf or .docx
Camera (RAW): .cr2, .nef, .arw, .dng
Audio (Logic, Ableton): .als, .logicx + .wav/.mp3 exports
Any other tool: If it produces a file, you can timestamp it

Frequently asked questions

I already send deliverables by email. Isn't that proof enough?
Email proves you sent something, but doesn't independently verify what was in the attachment. Email timestamps can be disputed. An RFC 3161 timestamp provides independent, cryptographic proof of the file's exact content and date.
Can I timestamp a folder of project files?
Yes. Create a ZIP archive and timestamp it. The hash covers the entire archive — any change to any file inside invalidates the proof.
Does my client need ProofStamper to verify?
No. They can verify on ProofStamper's verification page (free) or independently using OpenSSL.
What if I forgot to timestamp before delivering?
A timestamp after delivery still proves the file existed at that date, but it's less convincing for delivery timing. The strongest proof comes from timestamping before sending.
Is this admissible in court?
RFC 3161 timestamps are recognized under eIDAS (Article 41) and admissible in most jurisdictions. Their probative value is assessed by the court. Having a certified timestamp is always better than no proof.
Is there a limit on the free plan?
No hard limit. Certify as many files as needed, one at a time. Free includes a watermark on the PDF. Pro ($9/month) removes watermark and adds batch processing.