PSI-COMMIT

PSI-COMMIT is a cryptographic commitment tool for proving that a prediction, hypothesis, or decision was made before the outcome was known. Its site frames the purpose as proving someone “said it first,” and it supports both commitment and later reveal with mathematical verification. The service also describes commitments as Bitcoin-anchored and not dependent on trust in the operator.

A commitment is generated locally in the browser, and the user’s secret key never leaves the device. The page says the system uses HMAC-SHA256 and that the MAC is stored, while the original message is kept separate. It also offers verification in the browser from a receipt and original message, plus a separate Bitcoin timestamp check using .ots and .stamp.txt files. Public and private commitments are supported, and public commitments can appear on a profile or on a global wall through an “Add to Wall” option.

The interface includes sign-in with Google, GitHub, or Discord, username and profile editing, comments, followers, and communities joined. It also provides a reveal flow for .psc receipt files and original .txt messages, and a demo mode in which commitments are generated locally but not saved. The site says independent verification files can be dropped on the Verify tab or at opentimestamps.org to confirm the Bitcoin timestamp. It also states that the math runs entirely in the browser, with no server, no internet, and no trust required for verification.

PSI-COMMIT names researchers, forecasters, executives and teams, and fair games as example users. Researchers are described as using it to pre-register hypotheses and reduce p-hacking and HARKing; forecasters to create a portable prediction record; executives and teams to seal strategic decisions; and fair games to support simultaneous sealed-bid auctions, game moves, or contest submissions. The page also states that the cryptographic core is published for public audit. It is licensed under MIT.