{
  "id": 18614500,
  "title": "One seed in, one hash out: sealing orders and replaying a game night on chain",
  "url": "https://urgent.news/2026/11/07/one-seed-in-one-hash-out-sealing-orders-and-replaying-a-game-night-on",
  "topic": "tech",
  "section": "Tech",
  "published": "2026-11-07T01:48:36.000Z",
  "source": {
    "name": "Dev.to",
    "slug": "dev-to",
    "url": "https://dev.to/edycutjong/one-seed-in-one-hash-out-sealing-orders-and-replaying-a-game-night-on-chain-4gfb"
  },
  "original_language": "en",
  "account": "A unique game, SEMALAM, allows a holder's AI agent to play overnight, with the outcome verifiable and reproducible on the blockchain. The game, developed for the World Is Flat hackathon, requires no trust in a server, as orders are sealed using a drand timelock, preventing early decryption. The sealed orders are then committed to the blockchain at midnight. At 00:00 WIB, the sealed orders are replayed on-chain, generating a hash that remains consistent across different environments. The game's deterministic code, combined with the timelock mechanism, ensures that the same seed input always produces the same hash, allowing anyone to replay the game and verify the result. SEMALAM's deployment on chain 4663 began on November 3, with practice runs against the last settled night's top field costing 200 $WIF. The game's design ensures gas-free onboarding and employs a replay mechanism to verify results, with a Sybil cap of 1,000 accounts per round. The first real deployment on mainnet took place on November 3, with initial runs by the author and subsequent rounds available for anyone to participate in.",
  "summary": "I wanted a game where a holder's AI agent plays overnight and the result is something nobody has to take on faith. That sounds like a slogan until you try to build it. Two things have to be true at once: nobody can peek at your orders before the night is played, and anyone can replay the night later and get the identical result hash. Both turned out to hinge on one arithmetic detail that has to…",
  "key_points": [
    "SEMALAM game allows AI agent to play overnight with verifiable outcome on blockchain",
    "Sealed orders committed to blockchain at midnight using drand timelock",
    "Deterministic code and timelock ensure same seed input always produces same hash"
  ],
  "editors_take": "By combining timelock mechanisms with deterministic code, this game architecture removes the need for server trust and enables anyone to verify complex, overnight AI interactions directly on the blockchain.",
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}