YouSaidThat lets you seal any prediction. A market call, a hot take, a thesis — with SHA-256 hashing, AES-256-GCM encryption, and RFC 3161 timestamps. No one can see it until you reveal it. Once you do, anyone can verify you wrote it exactly then, without trusting you or any platform. Built on open cryptographic standards. No accounts needed. Fully auditable. Your proof lives outside any server.
Hi everyone!!
I built YouSaidThat because "I called it first" is impossible to
prove after the fact. Screenshots get edited, timestamps can be faked. Reddit or X, even if are public, require an other layer of trust.
So I made proof the default. You write a prediction, it's encrypted in your
browser (the server never sees your text), and the decryption key is
timelock-sealed with drand: it Literally doesn't exist until the date you pick.
On top of that, a SHA-256 hash gets anchored on Bitcoin via OpenTimestamps plus
an RFC 3161 timestamp.
When you reveal, anyone can verify you wrote exactly that, exactly then, without
trusting me, the platform, or any server. No accounts, fully open source, fully
auditable. Two modes: Proof of Existence (prove you knew it now) and Sealed Prediction
(lock it until a future date). Would Love your feedback, especially on the
verification flow :)
The no-account setup and verifiable timestamping make this feel cleaner than screenshots or old posts. Curious how simple the reveal and verification flow feels for non-technical users.
About yousaidthat.org on Product Hunt
“Prove that you said things before anyone else ”
yousaidthat.org launched on Product Hunt on June 16th, 2026 and earned 65 upvotes and 3 comments, placing #47 on the daily leaderboard. YouSaidThat lets you seal any prediction. A market call, a hot take, a thesis — with SHA-256 hashing, AES-256-GCM encryption, and RFC 3161 timestamps. No one can see it until you reveal it. Once you do, anyone can verify you wrote it exactly then, without trusting you or any platform. Built on open cryptographic standards. No accounts needed. Fully auditable. Your proof lives outside any server.
yousaidthat.org was featured in Developer Tools (515.5k followers), GitHub (41.3k followers), Bitcoin (1.9k followers), Encryption (702 followers) and Vercel Day (20 followers) on Product Hunt. Together, these topics include over 101.4k products, making this a competitive space to launch in.
Who hunted yousaidthat.org?
yousaidthat.org was hunted by Giulio Parrinello. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Want to see how yousaidthat.org stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
Giulio Parrinello