Proof of authorship
How to prove you wrote something
You cannot prove who typed a sentence. What you can prove, convincingly, is that the work existed and evolved in your hands over time. Reviewers accept that as authorship evidence because faking it is more work than writing the piece. Here is the evidence hierarchy, weakest to strongest.
Level 1: your word and your voice
Being able to discuss the work fluently, explain choices, and rewrite a passage on demand is real evidence and costs nothing. Its weakness: it arrives only after you are already under suspicion, and some reviewers discount it.
Level 2: platform version history
Google Docs, Word online, and Notion keep revision timelines. A history showing the piece growing across sessions, with edits and deletions, is the workhorse of authorship defense and settles many accusations by itself.
Its limits: histories can be started by pasting (the reviewer sees one giant first revision), they live inside your account where nobody else can verify them independently, and they can be hard to export in a shareable, trustworthy form.
Level 3: independently verifiable checkpoints
The strongest form: a record sealed outside your own accounts, where each version of the work is fingerprinted and timestamped by parties that cannot be edited after the fact, and anyone can check it without trusting you or the tool.
This is what Firsthand does: as you write, it seals checkpoints (a cryptographic fingerprint of your text, never the text itself) with independent timestamps and a public verification page. Handing a reviewer a link where they verify your drafting timeline themselves changes the conversation from your word against a score to a checkable record against a guess.
What no tool can honestly claim
None of this proves who physically typed. A determined person could theoretically fake a drafting history by drip-feeding text over days, which is why the honest claim is burden-shifting, not certainty: a real, verifiable drafting history is effortless to have if you did the work and expensive to fabricate if you did not. Be suspicious of any tool claiming to certify work as human-made; that is not a provable claim.
Build the record before anyone accuses you
Firsthand seals verifiable checkpoints of your work as you write: your words never leave your browser, only a fingerprint is sealed, and anyone can verify the timeline without trusting you or us. One document free, no card needed.
Protect your work, free