# `gno.land/r/moul/demo/grc20`

Step 6 of the `r/moul/demo` walkthrough: the same ledger as
[`wikicoin`](../wikicoin), but on the standard `p/nt/grc20` token instead of a
hand-rolled tree.

```go
var (
	Token         *tokens.Token          // exported: anyone may read
	privateLedger *tokens.PrivateLedger  // unexported: mint, burn, transfer
)
```

**That split is the whole lesson.** `NewToken` returns two handles onto one
token. The `Token` handle is read-only and safe to export, so other realms can
call `Token.BalanceOf(...)` or `Token.GetName()` across the realm boundary. The
`PrivateLedger` handle can move anyone's balance, so it stays unexported: gno's
export rules become the access control, with no permission check to get wrong.

Exporting the ledger by accident is a total loss of the token. Keep it lowercase
and expose deliberate wrappers instead.

`init` creates "Foo Token" (`FOO`, 4 decimals) and mints 100000000 units to a
test address. `MyBalance()` shows a read scoped to the caller.

Previous: [`wikicoin`](../wikicoin). Next: [`vault`](../vault) locks tokens up.

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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.

**On mainnet:** [![deployment status](https://gnoscope.com/_badges/shield/status/r/moul/demo/grc20/v0?network=mainnet)](https://gnoscope.com/realm/r/moul/demo/grc20/v0) [![transactions](https://gnoscope.com/_badges/shield/txs/r/moul/demo/grc20/v0?network=mainnet)](https://gnoscope.com/realm/r/moul/demo/grc20/v0) [![unique callers](https://gnoscope.com/_badges/shield/users/r/moul/demo/grc20/v0?network=mainnet)](https://gnoscope.com/realm/r/moul/demo/grc20/v0) [![deployed revision](https://gnoscope.com/_badges/shield/version/r/moul/demo/grc20/v0?network=mainnet)](https://gnoscope.com/realm/r/moul/demo/grc20/v0)

**Dependency graph:**

![gno.land/r/moul/demo/grc20/v0 dependency graph](https://raw.githubusercontent.com/moul/gno-contracts/main/_assets/gno.land/r/moul/demo/grc20/v0/deps.png)

> ⚠️ **Disclaimer:** provided as-is, without warranty; not security-audited. Full disclaimer: [DISCLAIMER](https://github.com/moul/gno-contracts/blob/main/DISCLAIMER.md).

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