yousaidthat.org

I coudn't prove that i had said a thing in the past. So i built YouSaidThat

For years I lost arguments I should have won. Not because I was wrong, because I had no proof I said it first. "I told you so" has zero credibility without a timestamp someone can actually verify.

So I built YouSaidThat (YST)

How it works-

• Write a prediction
• It gets SHA-256 hashed and AES-256-GCM encrypted client-side
• Anchored with an RFC 3161 trusted timestamp. You get a .capsule file, reveal it later, anyone can verify it The server never sees your text. Only hashes and proofs ever leave your browser. You don't have to trust me, and you don't have to trust the platform.

Why I built it the way I did: The obvious approach is "we'll store your prediction and reveal it later." The problem is that's just trust in a database. If I disappear, your proof disappears.

Zero-knowledge architecture means the proof lives outside any server. It's anchored to cryptographic infrastructure that exists independently of me. What it's for: Market calls. Hot takes. Technical predictions. Research hypotheses. Anything where being early matters and being believed later matters more. It's completely free. No ads, no premium tier, no monetization plans. I built this because I wanted it to exist and beacuse i first needed it, not to earn money from it. Open source, auditable, and meant to stay that way.

I'm a 21-year-old engineering student from Sicily. Built this solo. Fully open source, the architecture is auditable if you want to verify the claims. Would love feedback on whether the UX makes the crypto feel approachable. That was the hardest design problem: making something technically rigorous feel usable. (http://yousaidthat.org)