Luhn Checksum

⚠️ Experimental — generated with no human supervision by the daily MCP pipeline to exercise gno tooling. Not audited. See r/moul/x/daily.

Put a number in the path and the realm tells you whether its Luhn check digit is right — and if not, what it should have been.

Demo of the p/moul/x/daily/luhn library — validation, the check digit and the separator handling all come from the package; this realm holds no checksum logic of its own. Read-only and stateless, so Render is fully deterministic.

/r/moul/x/daily/luhndemo/v0                  → usage + worked samples
/r/moul/x/daily/luhndemo/v0:79927398713      → valid
/r/moul/x/daily/luhndemo/v0:79927398710      → invalid, suggests check digit 3
/r/moul/x/daily/luhndemo/v0:4539-1488-0343-6467 → separators are ignored

The samples on the root page are picked to show the two error classes Luhn actually catches: a wrong digit, and two adjacent digits swapped.

Built for gno 0.9.

Part of 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.