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Jev 对拳 · AI 先出拳，你再选择。每一局都可核验。
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- Updated Sep 2026
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CommunityJev Demos & Experiments
Jev Rps
Jev RPS is rock-paper-scissors against TypeSafe's Jev with a commit-then-reveal protocol: the server seals Jev's move with a salted SHA-256 commitment and AES-256-GCM encryption before your buttons unlock, and the browser recomputes the hash after the reveal.
- Stars
- 1
- Language
- JavaScript
- License
- MIT
- Published by
- Community
- Author
- 0xlau
- Last verified
- Oct 2026
About this project
[![Contributors][contributors-shield]][contributors-url] [![Forks][forks-shield]][forks-url] [![Stargazers][stars-shield]][stars-url] [![Issues][issues-shield]][issues-url] [![MIT License][license-shield]][license-url] [![LinkedIn][linkedin-shield]][linkedin-url] Jev throws first — and every round is verifiable. View Demo · Report Bug · Request Feature. Usage Roadmap Contributing License Contact Acknowledgments.
Quoted from the project's README. Read the full README.
- Languages
- JavaScript
Highlights
- Jev commits before you move, and if the provider fails the round simply stops rather than substituting a fabricated move.
- Verification runs client-side: the browser stores the commitment first, then recomputes and compares the hash after the reveal.
- Every completed round in the series feeds Jev's next decision, up to 500 rounds, with readouts for regularity, cunning, instability and strategy shift.
- An optional early peek is a real DOM element, so unrevealed moves never reach the page, and peeked rounds are tracked separately from blind play.
Watch out
The commitment only proves Jev did not change its move after sealing; it says nothing about how strong its play is or whether series context actually influences it. If the provider fails mid-round the round stops, so flaky upstream ends a series rather than producing a result. GAME_SECRET must be at least 32 characters, must be set as a server-side variable with no NEXT_PUBLIC_ prefix, and must stay stable across deploys, since rotating it invalidates old fairness proofs and history signatures. The TypeSafe key is typed into the page and held in page memory only, and dev mode auto-generates a temporary sealing key, so old series do not survive restarts without a fixed secret. GA4 is optional and off by default, but enabling it requires a consent banner and Consent Mode for EU or UK visitors. Copy reviewed against the repository README on 2026-10-04, not from running it.
Questions about this entry
Short answers drawn from the linked project or page.
Only that Jev's move was fixed before you chose and was not swapped afterward. The server seals it with a salted SHA-256 commitment and AES-256-GCM encryption, the browser stores that commitment before your buttons unlock, and after the reveal the hash is recomputed and compared, so the round counts only if they match. It is a fairness guarantee about the protocol, not evidence about how Jev decides or how well it plays.
Not without breaking the hash check that runs in your browser. Your options stay locked until the commitment is stored, unrevealed moves never enter the page because the cover is a real DOM element, and a mismatch means the round does not count. Peeking at all is allowed through Sneak a peek; those rounds still count in overall statistics and still enter Jev's memory, but they are tracked separately from blind play so you can compare the two.
GAME_SECRET. It must be at least 32 characters, set as a server-side variable without a NEXT_PUBLIC_ prefix, and kept stable, because rotating it invalidates old fairness proofs and old history signatures. Dev mode auto-generates a temporary sealing key, so series do not survive restarts without a fixed secret, and preview deployments need one too. Your TypeSafe key goes into the game UI and is forwarded through a same-origin route handler, never as a public environment variable.
No. The README states that the API key, sealed round tokens, commitments and both players' moves are never sent, only outcomes and counts. No analytics script loads at all unless a measurement ID is configured. If you do enable it, GA4 sets cookies, so EU and UK visitors need a consent banner and Consent Mode, and the nonce-based CSP only opens the gtag hosts in connect-src and img-src while an ID is set.
Every completed round in the current series feeds the next decision, up to 500 rounds per series, and the UI scores regularity, cunning, instability and strategy shift on a 0 to 100 scale. That is series context supplied as state, so it is worth reading as a prompt design choice rather than evidence of memory inside the model.
Node.js 22.x and npm, then npm ci and npm run dev, served on http://127.0.0.1:4173. Your TypeSafe key is typed into the game UI under Connect Jev, stays in page memory only and is forwarded through a same-origin route handler; it is never written into local match history, export files or app logs. History lives in the browser and exports as JSON.
Next.js, React and Vercel, distributed under the MIT License. The UI ships in English and Chinese, and the site is positioned as a personal match log rather than a competitive leaderboard. The repository is a community effort soliciting strategies, prompts, eval suites, benchmarks and UX work toward an unbeatable opponent.
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