How to Copyright a Book (and Prove You Wrote It First)

Your book is protected by copyright the moment you write it down — but if a dispute ever arises, you need evidence of when you created it. Here is how copyright actually works for books, when to register, and how a blockchain timestamp gives you instant, dated proof of authorship.

Copyright is automatic — registration is the upgrade

Under U.S. law, your manuscript is copyrighted as soon as it is "fixed in a tangible medium" (saved, typed, or printed). You do not have to do anything to own the copyright. What you don't automatically have is proof of the date and the legal benefits that come with registration.

Registering a book with the U.S. Copyright Office

To register a literary work you file Form TX at copyright.gov, pay the fee, and deposit a copy of the manuscript. Registration matters because:

• It is required before you can sue for infringement in the U.S.
• Registering within three months of publication preserves eligibility for statutory damages and attorney's fees.
• It creates a public record of your claim.

An ISBN is not copyright — it is just a retail identifier. And mailing yourself a copy ("poor man's copyright") carries no real legal weight; postmarks are easy to fake and courts give them little credence.

Timestamp your manuscript before you share it

The riskiest moment for an author is sharing the draft — with beta readers, agents, editors, or contest judges. A blockchain timestamp lets you create a permanent, independently verifiable record that this exact manuscript existed on this date, before you sent it anywhere.

BlockchainSign computes a SHA-256 fingerprint of your file in your browser (we never see the manuscript), records that fingerprint on the Ethereum blockchain, and gives you a lifetime certificate. If authorship is ever questioned, you can show the file existed — unchanged — as of the timestamp. It complements formal registration and is the credible, modern version of "poor man's copyright."