# Lottery
> ⚠️ **Experimental — generated with no human supervision** by the daily MCP pipeline (Solidity→Gno port). Not audited. See [r/moul/x/daily](https://github.com/moul/gno-contracts/blob/main/r/moul/x/daily/README.md).
---
An idiomatic gno.land port of the classic Solidity **Lottery** contract.
Players `Enter` the current round (one entry per address per round — a second
entry panics). Once a round has at least two entrants, anyone may `DrawWinner`,
which picks a winner deterministically from the block height
(`ChainHeight() % len(entrants)` over the deterministically-sorted entrant set),
records it in the winners history, and opens a fresh round. Solidity's
`block.number`-based pseudo-randomness maps to `runtime.ChainHeight()`, and
`msg.sender` maps to `unsafe.PreviousRealm().Address()`. `Render` shows the open
round, its entrants, and the table of past winners.
## Example calls
```
# Two different accounts join round 1
gnokey maketx call -pkgpath gno.land/r/moul/x/daily/lottery/v0 -func Enter ... # from alice
gnokey maketx call -pkgpath gno.land/r/moul/x/daily/lottery/v0 -func Enter ... # from bob
# Anyone draws the winner and opens round 2
gnokey maketx call -pkgpath gno.land/r/moul/x/daily/lottery/v0 -func DrawWinner ...
```
Read-only helpers: `CurrentRound()`, `NumEntrants()`, `HasEntered(addr)`.
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---
Part of **[moul/gno-contracts](https://github.com/moul/gno-contracts)** — moul's versioned gno.land contracts. See the repository for the full catalog, build/test tooling, and usage.
**Dependency graph:**
> 🧪 **Highly experimental — potentially vibe-coded.** Not audited; may break, change, or be removed at any time. Do not use with anything of value. Full disclaimer: [DISCLAIMER](https://github.com/moul/gno-contracts/blob/main/DISCLAIMER.md).
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CurrentRound() int
DrawWinner(cur interface {.seal func(); Address func() .uverse.address; IsCode func() bool; IsCurrent func() bool; IsEphemeral func() bool; IsUser func() bool; IsUserCall func() bool; IsUserRun func() bool; PkgPath func() string; Previous func() .uverse.realm; String func() string; Sub func(string) .uverse.realm; Subpath func() string}) string
Enter(cur interface {.seal func(); Address func() .uverse.address; IsCode func() bool; IsCurrent func() bool; IsEphemeral func() bool; IsUser func() bool; IsUserCall func() bool; IsUserRun func() bool; PkgPath func() string; Previous func() .uverse.realm; String func() string; Sub func(string) .uverse.realm; Subpath func() string})
HasEntered(addr string) bool
NumEntrants() int
Render(path string) string
Signatures reconstructed verbatim from vm/qfuncs — interface params keep their inline definitions.
vm/qrender output, sanitized (docs/render-security.md) and displayed in an empty-sandbox iframe — scripts, forms and popups cannot run. Links stay inert in-preview; right-click to open.