← All articles · March 2026 · 2 min read
The Poor Man's Patent: Why Mailing Yourself an Envelope Doesn't Work
The old trick has no legal basis. Here is what a modern timestamp fixes — and what it still does not.
What Is a Poor Man's Patent?
The "poor man's patent" (or "poor man's copyright") is the idea of mailing yourself a sealed envelope containing your work. The postmark is supposed to serve as a timestamp. It has been folk wisdom for decades. The U.S. Copyright Office says plainly that there is no provision in copyright law for this kind of protection and that it is not a substitute for registration. An envelope can be mailed unsealed and filled later, or steamed open, and a postmark dates the envelope — not its contents.
Why the Old Method Fails
The fundamental flaw is that the evidence stays in the hands of the person with the most incentive to tamper with it, and nobody else can check it. Good evidence of a date is something a third party can verify independently.
What a Blockchain Timestamp Fixes
Instead of a postmark, you get a transaction recorded on Bitcoin — a public ledger replicated by thousands of independent nodes. Instead of envelope contents, you get a SHA-256 hash — a fingerprint that changes completely if a single character of the content changes. Instead of "trust me," anyone can recompute the hash from your original content and find it in the public transaction.
What It Does Not Fix
Like the envelope, a timestamp is only evidence of a date. It does not prove who created the content, it gives no exclusive rights, and it does not replace a patent application or a copyright registration. Mailing an envelope costs a few dollars and proves very little. A registration on icalledit.io costs $19 and proves exactly one thing well: that this content existed at that time.
Make the Switch
If you've been relying on the envelope method, a blockchain timestamp is a better version of the same idea: faster, permanent, and verifiable by anyone. Read our full comparison of the options — patent, copyright registration, notary, NDA and timestamps — before you decide what you actually need.
A timestamp proves that content existed at a point in time. It is not legal advice, a patent, a trademark or a copyright registration. Compare the options.