> For the complete documentation index, see [llms.txt](https://docs.tachyo.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tachyo.ai/concepts.md).

# Core concepts

Every screen in Tachyo leans on the same handful of ideas: what a tier is claiming, why scoring is per chain, what the signal is and is not, and how old the number in front of you actually is. Learn these six and the rest of the product reads itself.

If you only read one, make it [Wallet tiers](/concepts/wallet-tiers.md).

* [**Wallet tiers: S, A, B, C**](/concepts/wallet-tiers.md): what each letter claims, and why unrated is a real answer rather than a low score.
* [**Scoring is per chain**](/concepts/per-chain-scoring.md): skill is local, and a reputation does not travel across a chain boundary.
* [**The Tachyo Signal**](/concepts/tachyo-signal.md): the model verdict on a token, with the dump risk and confidence next to it.
* [**Smart money, holders, community**](/concepts/smart-money.md): four populations that get collapsed into one word, and why that costs you money.
* [**Snapshots and freshness**](/concepts/freshness.md): three clocks run on a token page and they disagree on purpose.
* [**Clusters, insiders and fresh wallets**](/concepts/clusters.md): how many of those holders are really the same person.


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