Goldgrid — pick five, strike gold

A free number draw for Solana Seeker owners, built for Clock In, the Solana Mobile hackathon. Site: https://elaris-xyz.github.io/goldgrid/ · Pitch deck (PDF)

A new round every five minutes: pick 5 numbers from 1 to 85, and when the timer ends ORAO VRF randomness draws the winning five. The tickets with the most matches split a pot that sponsors fund in SKR. Entry is free, full stop: a paid entry would make this a lottery.

• One Seeker, one ticket. On mainnet a ticket is tied to the Seeker Genesis Token, checked on-chain against the SGT group (120,999 members). Extra tickets come from a streak — one per 7 consecutive rounds played, up to 5 — never bought.
• Nobody can know the numbers in time to use them, or re-roll them. Entries close first; the randomness is committed after that, and the reveal must be of that exact commitment (its seed slot is recorded), so whoever runs the draw cannot peek, re-commit and try again.
• Every round has a winner when anyone matches. The best match wins, not only 5 of 5. If nobody matches anything, the pot rolls into the next round.
• Sponsors grow the pot as people enter. Each ticket moves 1 SKR from the sponsor budget into that round's pot.
• Winners are paid automatically. Paying out is permissionless and can only pay the ticket's owner, so the crank pays every winner and returns every other ticket's deposit right after the draw. A player signs once per round: the ticket.
• The draw needs no server of ours. Commit, reveal, scoring and payout are permissionless; a hosted crank runs them on GitHub Actions with a key that holds no authority, and anyone can run another. If a committed draw is never revealed (an oracle outage), it can be committed again after 300 slots.

Try it in five minutes

The app runs on Solana devnet; nothing here costs real money.

1. Install the APK from the latest release on an Android phone (a Seeker, or any Android 8+ phone).
2. Set up Phantom for devnet: in Phantom, Settings → Developer Settings → Testnet Mode on, and pick Solana Devnet. (Without it Phantom refuses the connection with "Incorrect mode".)
3. Open Goldgrid and connect. An empty devnet wallet gets a Get free devnet SOL button; if the public faucet is busy, use https://faucet.solana.com. Entry is free — each ticket only holds a small SOL deposit that comes back after the draw.
4. Pick five and enter. Tap five numbers (or shake the phone for a quick pick) and Enter round #… — free, then approve in Phantom. Rounds are five minutes; entries close 20 s before the draw, and the last 30 s before that are last call (too late for a wallet approval to land), which the app shows.
5. Wait for the draw. The winning numbers turn over in the app, a notification arrives with the result, and a prize is paid into your wallet by itself — there is nothing to claim. Verify this draw on Solana Explorer shows the randomness request and reveal behind every result.

With one player every ticket that matches anything wins the round's pot. A ticket matches at least one number 26.7% of the time, so a solo judge wins about one round in four; with ten players 95.5% of rounds have a winner, and it becomes a race for the best match.

Why SKR

Prizes are paid in SKR, the token of the Solana Seeker community, and SKR only ever flows out: no token is taken to enter.

• It belongs to the players. Seeker owners already hold SKR, so a prize stays in the community that plays.
• The money is visible first. Sponsors fund the program's vault before anyone plays; every prize is backed by tokens on-chain.
• Any mint works. The prize mint is set once at initialize, and the program uses the token interface, so SPL Token and Token-2022 mints both work. On devnet it is a stand-in, Test SKR (devnet) (GNafN4xs8TRPxKCNzUwhX9rwsVvNdCY5dbjW74yyG9r8), with no value; its name and logo come from Metaplex metadata written by cli/token-metadata.mjs. Mainnet uses the real SKR mint.

What it makes possible next: sponsored rounds carrying the sponsor's name, featured draws with a bigger pot, a sponsor's own token paid alongside SKR, Seeker-only rounds (SGT gating is already in the program), and streak rewards paid in SKR.

Layout

Path	What
programs/daily_draw	Anchor program (Rust). logic.rs holds the draw rules, sgt.rs the Seeker check
cli/	Devnet end-to-end test (e2e-devnet.mjs), the draw crank (crank.mjs), admin scripts, shared client (lib.mjs)
android/	The app: Kotlin + Compose, Mobile Wallet Adapter
.github/workflows/crank.yml	Runs the draw crank on GitHub Actions
docs/	The site and the test token's logo and metadata (docs/token/), served by GitHub Pages
brand/	The Goldgrid icon
spikes/	The first randomness spike (Switchboard, since replaced by ORAO VRF)
scripts/	Toolchain and build helpers (WSL)

Build and test

Requires Rust, the Solana CLI (Agave 4.x) and Anchor 0.32.2.

anchor build
cargo test -p daily_draw --lib        # unit tests, incl. a real mainnet SGT fixture
cd cli && npm install && node e2e-devnet.mjs   # one full round on devnet

Devnet program: gvd3fv3QgWvTMzLfxN2HBKkspAeVwzGBCZkW9ixaucM — demo mode: 5-minute rounds, entries close 20 s before the draw. Only the program's upgrade authority can initialize it; the admin can retime future rounds (set_schedule), and the program refuses any schedule that would reuse a past round's number.

Who runs the draw

Nobody has to be trusted to run it, and nobody's computer has to be on. Drawing a round (randomness request and commit, reveal, scoring, closing) is permissionless: anyone can send those transactions, and the program only accepts an ORAO VRF request made after entries closed and still unanswered, and reveals only that request's result. cli/crank.mjs does it for every round past its draw time; .github/workflows/crank.yml runs it on GitHub Actions around the clock with a key that pays fees and holds no authority.

cd cli && node crank.mjs            # run a crank yourself, beside the hosted one

Playing a round

A round lasts five minutes and has three phases, which the app shows as a bar under the timer:

Phase	When	What the player can do
Open	from the start until 50 s before the draw	pick five and enter (free)
Last call	the 30 s before entries close	pick for the next round; a wallet approval would likely land too late, so the app does not offer Enter
Closed	the last 20 s, until the draw	pick for the next round; the numbers are kept

Rounds are named by their UTC date and their number that day, 2026-09-30 · #50. Right after the draw the crank pays winners and returns every other ticket's deposit; the app reveals the winning balls and a notification says what happened.

The app

• Sign-in screen that plays at every start: the logo assembles and picks its five, then a connected player goes straight to the game
• Mobile Wallet Adapter with Phantom (devnet: Testnet Mode on). The wallet only signs; the app sends through its own RPC and resends until confirmed. The wallet is remembered until the player disconnects
• One screen to play: the round card (phase, timer, pot and where it comes from), the 5-of-85 grid (tap, quick pick, or shake), an action button that always says what it is waiting for, and the player's tickets with results and a link to each draw on Solana Explorer
• Activity (tap the SKR balance): every ticket with its date, result and prize
• Notifications with the result picture and the Goldgrid chime; in Settings, wins, results and new-round reminders (off, hourly, every round) are separate switches, with sound on or off
• Everything the app needs to open is kept on the device, so it renders at once and refreshes in the background

Status

• Program: enter, commit/reveal with ORAO VRF, scoring, split, rollover, permissionless payout, rent return, schedule changes that only move forward
• Devnet end-to-end test (stranger payouts, rent returns) and cli/orao-security-test.mjs (re-roll and request-swap attacks, all refused)
• Hosted crank on GitHub Actions with a fee-only key
• Android app on a real device with Phantom: entry, results, automatic payout, notifications, settings
• Site: https://elaris-xyz.github.io/goldgrid/
• Signed release APK (1.0.3) for judges
• Mainnet: SGT gating live, a sponsored SKR pot

License

© 2026 The Goldgrid authors. Goldgrid is source-available under the Business Source License 1.1: anyone may read, build, test, audit and evaluate it (judging included), and modify it for non-production use. Running it, or a derivative, in production needs the authors' permission; the one exception is the draw crank, which anyone may run for the Goldgrid program. On 2030-10-01 the code becomes GPL-2.0-or-later. The Goldgrid name and logo are not licensed.