The "poor man's copyright" is one of the most repeated pieces of advice on the internet: mail yourself a copy of your work in a sealed envelope, keep it unopened, and the postmark "proves" you created it on that date. It sounds clever. It also doesn't work.
What people think it does
The idea is that the dated postmark establishes that your work existed by a certain date, so you can prove you were first in a dispute. People use it for manuscripts, lyrics, screenplays, and business ideas because it feels free and official.
Why it falls apart
- It isn't in copyright law. The U.S. Copyright Office explicitly notes there is no provision granting any protection from mailing yourself a copy. It is not a substitute for registration.
- Postmarks and envelopes can be faked. You can mail an unsealed envelope and insert pages later, or steam it open. Because it's so easily manipulated, courts give it little weight.
- It proves almost nothing useful. At best it shows an envelope was mailed — not what was inside, or that the contents are unchanged.
What actually establishes your rights
Two things matter: owning the copyright (which happens automatically when you create the work) and proving the date if there's ever a dispute. For the strongest legal position, register with the U.S. Copyright Office — that's what lets you sue and claim statutory damages.
The modern "poor man's copyright"
For instant, low-cost dated proof, a blockchain timestamp does what the envelope trick was supposed to do — but properly. You hash your file and record that fingerprint on a public blockchain. The result is:
- Tamper-proof — the record can't be altered after the fact.
- Independently verifiable — anyone can check it, with no trust in you or us.
- Permanent — it doesn't depend on a company staying in business.
With BlockchainSign, the file never leaves your browser — only its SHA-256 fingerprint is published — and you get a lifetime certificate that your exact work existed on a specific date. It's the credible version of the idea behind poor man's copyright, and it pairs naturally with formal registration.