Built a free tool to cryptographically seal predictions and decisions with Bitcoin timestamps

If you've ever wanted to prove you called something before it happened without relying on any third party or centralized platform, this is what I've been building.

PSI-COMMIT lets you write a prediction, seal it cryptographically, and timestamp it on the Bitcoin blockchain via OpenTimestamps. The prediction stays hidden until you choose to reveal it. When you do, anyone can verify mathematically that you committed to those exact words before the outcome.

The secret key never leaves your browser. We store only the cryptographic fingerprint. Nobody including us can read your prediction before you reveal it, backdate your timestamp, or alter what you committed to. The math and Bitcoin make it impossible.

No account required to verify, just a Google sign in to commit a prediction. No third party required to validate the proof. Every commitment is anchored to a real Bitcoin block and anyone can check it independently on a block explorer.

How it works in practice: write your prediction and a cryptographic fingerprint is published while your actual message stays hidden. Wait for the outcome. Reveal your prediction and anyone can verify it matches the original fingerprint and Bitcoin timestamp.

Once revealed all the cryptographic material is public and anyone can recompute the proof themselves in their browser without trusting us at all.

Would love any feedback from this community!

Free and open source: psicommit.com | github.com/RayanOgh/psi-commit