Every year, millions of creators mail themselves envelopes — a sealed package containing their work, postmarked by the USPS. The idea is simple: if someone steals your work, you open the envelope in court and the postmark proves you had it first.

It doesn't work. And it hasn't for decades. Here's why — and what actually does.

Why the poor man's copyright fails

The US Copyright Office has explicitly stated that mailing yourself a copy of your work does not provide copyright protection beyond what you already have. Copyright attaches automatically at the moment of creation. The envelope doesn't add anything.

More importantly, even if you're trying to use it as evidence of a creation date, it has serious problems:

  • It's tamperable. Envelopes can be steamed open, contents swapped, and resealed. Courts know this. Opposing counsel knows this. The postmark proves the envelope was mailed — not what was inside it when it arrived.
  • Chain of custody is unverifiable. You've been holding that envelope for three years. Nothing prevents you from replacing its contents before opening it in a dispute.
  • It doesn't capture digital files well. The USPS postmark covers the envelope date, not the hash or version of a specific digital file. Two files with the same name can be completely different.

In practice, courts treat USPS postmarks as weak evidence at best. Opposing counsel routinely challenges them, and the challenge usually succeeds.

What copyright registration does (and doesn't)

Registering with the US Copyright Office ($65, 6+ month processing time) gives you something genuinely useful: the right to sue for statutory damages and attorney's fees in federal court. That's valuable if you go to court.

But it still doesn't solve the date problem. The registration date is the date you filed, not the date you created the work. If you register in 2026 for work you claim you created in 2024, the registration doesn't prove the 2024 date — you still have to establish that separately.

What actually works: cryptographic timestamping

A cryptographic timestamp creates a mathematically verifiable record that a specific piece of content existed in a specific form at a specific moment in time. It works like this:

  1. Hash the content. A SHA-256 hash converts your file into a 64-character fingerprint. If even one character changes, the hash changes completely.
  2. Sign and timestamp the hash. An Ed25519 digital signature ties the hash to a specific key at a specific time. An independent RFC 3161 timestamp authority certifies the exact second — independently of the signer.
  3. Anchor to an immutable ledger. The hash is submitted to the Bitcoin blockchain via OpenTimestamps. The Bitcoin block containing your hash has a timestamp that predates any future dispute, and it exists on millions of distributed nodes worldwide. No court order can alter it.

The result is a chain of evidence that is:

  • Not tamperable. Changing the content changes the hash. The hash doesn't match the signature. The proof is broken.
  • Independently verified. The timestamp authority, the Bitcoin blockchain, and the signature key are all separate systems. None of them require you to trust OriginProof or any single party.
  • Publicly verifiable. Anyone can verify the proof via a public link, without an account, for free, forever.

How to create a cryptographic timestamp for free

OriginProof handles all of this in one step. You upload a file or paste text, and within seconds you have:

  • A SHA-256 hash of your exact content
  • An Ed25519 signature with RFC 3161 certification
  • A pending Bitcoin anchor (confirmed within ~1 hour)
  • A permanent public verification URL anyone can check

No envelope. No postage. No waiting. 50 seals free every month.

The seal only works if it exists before the dispute. By the time you're in a lawyer's office, it's too late to create the proof retroactively. Seal your work the day you finish it.