PSI-COMMIT lets you seal a prediction or decision and prove you made it before the outcome — no third party required. Your message is locked with HMAC-SHA256 and a secret key that never leaves your browser. The commitment is anchored to Bitcoin via OpenTimestamps for a permanent, tamper-proof timestamp. Save yourpsc,stamp.txt, andots files and your proof is self-contained forever. Free, open source, MIT licensed.

Framer — Launch websites with enterprise needs at startup speeds.

Launch websites with enterprise needs at startup speeds.

I built PSI-COMMIT because there’s no trustless way to prove you said something before an outcome. Screenshots get faked, timestamps on centralized platforms get disputed, and you always end up relying on someone else’s word. The idea was simple, combine a cryptographic commitment scheme with Bitcoin anchoring so the proof is mathematically verifiable and permanently timestamped, with no third party involved. Your secret key never leaves your browser. This started as my first real software project. I had no prior experience with Python packaging or Git. Building it taught me bits of cryptography, backend development, and database security from scratch. What use cases would you find most valuable predictions, research pre-registration, or something else entirely?

Framer — Launch websites with enterprise needs at startup speeds.

Launch websites with enterprise needs at startup speeds.

PSI-COMMIT

Bitcoin anchored cryptographic commitments

Bitcoin anchored cryptographic commitments