Guestbook

⚠️ Experimental — generated with no human supervision. This realm was produced automatically by an MCP-driven agent to exercise the gno MCP server and tooling, and to generate test content for gno compilers, linters and formatters. Not audited. Not for production. Full context & folder README: r/moul/x/daily

A public, on-chain guestbook realm for gno.land. Anyone can leave a signed message; every entry records the signer's address, the message, and the block height at which it was signed. The realm's Render page shows all entries as a Markdown table, newest-first, with a running total.

Built for the sapphire testnet (gno 0.9).

Realm path

gno.land/r/REPLACE_ADDR/guestbook

(REPLACE_ADDR is substituted with the deployer's address at publish time.)

Public API

• Sign(cur realm, message string) — crossing tx. Appends an entry attributed to the immediate caller. Panics on an empty or over-long (>280 bytes) message.
• Count() int — total number of signatures (read-only).
• Render(path string) string — Markdown table of all entries, newest-first.

Example calls

Sign the guestbook (from an EOA via gnokey):

1gnokey maketx call \
2  -pkgpath "gno.land/r/REPLACE_ADDR/guestbook" \
3  -func Sign \
4  -args "gm gno.land!" \
5  -gas-fee 1000000ugnot -gas-wanted 2000000 \
6  -broadcast -chainid sapphire-1 -remote <rpc> mykey

From another realm, invoke it as a crossing call:

1guestbook.Sign(cross(cur), "hello from my realm")

View the rendered guestbook:

1gnokey query vm/qrender --data "gno.land/r/REPLACE_ADDR/guestbook:"

Example render output

1# Guestbook
2
3**Total signatures:** 2
4
5| # | Who | Message | Height |
6|---|-----|---------|--------|
7| 2 | g1v9jxgu…0gh | hello from my realm | 4210 |
8| 1 | g1jg8mtu…qf5 | gm gno.land! | 4180 |

Notes

• Caller identity uses the gno 0.9 interrealm convention: Sign is a crossing function that checks cur.IsCurrent() before deriving the author from cur.Previous().Address().
• Block height comes from chain/runtime.ChainHeight() — deterministic.
• Entries are stored in a gno.land/p/nt/avl/v0 tree keyed by a zero-padded sequence number so iteration order is deterministic and matches insertion order (reversed for newest-first rendering).

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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:**

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

> 🧪 **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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