5 Things You Can Prove Right Now — For Free

Proof used to be expensive. A notary cost time and money. A copyright filing took weeks. A signed contract needed two people in the same room. Today, the math has caught up to the need. Here are five things you can prove right now, in your browser, for free.

1. Photo ownership. Drop the photo in the browser. We compute a unique fingerprint of the file and stamp the time. From that moment, you can prove the photo existed and that you were holding it then. If anyone copies, crops, or republishes the photo later, the timestamp is on your side.

2. A contract that can't be denied. Two people sign the same document. The proof bundles both signatures with the document hash. Neither side can later claim 'I never agreed to that' because the math says otherwise. This works for NDAs, freelance agreements, partnership splits, and any 'we said we'd' moment that needs a record.

3. An idea, before anyone else sees it. Write the idea down. Drop the file. The proof says: this exact text existed at this exact time, on this person's machine. If a competitor publishes the same idea three weeks later, the time-order is settled. This is how researchers, founders, and inventors protect themselves before anything is public.

4. A signed invoice. Numbers locked. Date locked. Customer locked. Once the recipient receives the signed invoice, neither party can quietly edit the amount, change the due date, or claim a different version was sent. Most disputes about invoices are not about whether work was done — they are about which version of the paperwork is correct. Sign the paperwork.

5. A timestamp on anything. Sometimes you don't need to prove what — you just need to prove when. A draft you wrote before the meeting. A backup you took before the breach. A diagnosis you recorded before the lab result came back. The fingerprint plus the time is enough to anchor a moment in the timeline of the world.

Each of these takes about thirty seconds. Drop the file. Get the proof. Save it. The next time someone says 'show me you actually had this,' you have an answer that doesn't require their cooperation, our cooperation, or anyone else's permission. That is what a proof layer is supposed to feel like.