# Streaks — on-chain habit-streak tracker > ⚠️ **Experimental — generated with no human supervision** by the daily MCP pipeline to exercise gno tooling. Not audited. See [r/moul/x/daily](https://github.com/moul/gno-contracts/blob/main/r/moul/x/daily/README.md). --- A tiny on-chain habit tracker: call CheckIn() and it builds a streak as long as you come back within 100 blocks of your last visit; wait longer and the streak resets to zero on your next check-in. It tracks current streak, longest streak ever, and total check-ins per address, with a sorted leaderboard and a per-address detail view in Render. Neat because it turns block height — the one clock Gno actually has — into a believable stand-in for 'don't break the chain' daily habit tracking, with no wall-clock hacks. Built for sapphire (gno 0.9). Live demo (agent address): https://sapphire.testnets.gno.land/r/g12cs4cehujpffpjpywmkqj43m6u5ya53nj69sjz/streaks ## What changed in v1 Identical behaviour to [`v0`](https://github.com/moul/gno-contracts/tree/4f2df83869b80470eb81c48a82fdbe82256b8113/r/moul/x/daily/streaks) apart from rendering, which now goes through [`p/moul/kit/ui`](/p/moul/kit/ui/v0) instead of the local `shortAddr` helper. **One address format.** Eleven realms carried their own `shortAddr` with four different truncation rules, so the same account rendered differently depending on which realm you opened. `ui.Addr` is that decision made once: 8 leading characters, an ellipsis, 4 trailing, in backticks. The rendering change means the output differs from v0, which under this repo's versioning rule is a compatibility change, hence a new version rather than an edit in place. `v0` stays live and untouched. --- 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/streaks/v1 dependency graph](https://raw.githubusercontent.com/moul/gno-contracts/main/_assets/gno.land/r/moul/x/daily/streaks/v1/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).