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

# Concepts

Cross-cutting models that apply across the NAV Calculator, price feeds, and balance adapters: how positions are **identified** in a stable, machine-readable way, and how a reading signals that it is **unreliable** (stale prices, an unhealthy quote asset, or a down L2 sequencer).

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><strong>Position identity</strong></td><td>The 3-level protocol taxonomy, the <code>positionId</code> / <code>positionKind</code> / <code>isLocked</code> fields, decode schemas, and the reconciliation key.</td><td><a href="/pages/K26qlhqLm7Rm2Cjc6YNZ">/pages/K26qlhqLm7Rm2Cjc6YNZ</a></td></tr><tr><td><strong>Stale prices &#x26; sequencer</strong></td><td>Stale-feed handling, the quote-asset fallback, and the L2 sequencer uptime check.</td><td><a href="/pages/7W8HUlQOsA2Oi5sB6Hg5">/pages/7W8HUlQOsA2Oi5sB6Hg5</a></td></tr></tbody></table>


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