> For the complete documentation index, see [llms.txt](https://docs.upshift.finance/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.upshift.finance/vault-architecture/solana-vaults/risk-and-security-model.md).

# Risk & Security Model

### AUM Change Limits

The vault enforces asymmetric increase and decrease limits on `deployed_aum` updates. These are set by the admin in basis points via `set_aum_limits(increase_limit, decrease_limit)`.

* **Increase limit** - caps how much `deployed_aum` can grow in a single `operator_update_aum` call
* **Decrease limit -** caps how much `deployed_aum` can fall in a single update (typically set tighter than the increase limit)

This prevents sudden, large NAV swings, whether from operator error or attempted manipulation. The IDL enforces a maximum value via the `AumLimitTooHigh` error.

### Pause Mechanism

The admin can instantly pause all vault operations via `pause()`. When paused:

* `deposit` and `redeem` calls revert with `VaultPaused`
* Operator functions continue to work (the curator can still manage deployed capital)
* The admin can unpause at any time via `unpause()`

This provides a circuit breaker in case of an exploit, market event, or strategy issue.

### Admin Transfer Safety

Admin role transfers use a two-step nomination process:

1. Current admin calls `nominate_admin(new_admin)` . This creates a `NominatedAdmin` PDA with the nominee and an expiry timestamp
2. Nominated admin calls `accept_admin_nomination()` . Must be called before expiry

This prevents accidental or malicious ownership changes. If the nomination expires, it must be re-issued. The `NominatedAdmin` PDA is closed upon acceptance.

### Audit History

Built on the same architecture as Upshift's EVM vaults that secure $400M+ in TVL. Audited 3x in the past 12 months. A separate audit has been conducted for the Solana contracts and can be found [here](/developer-docs/smart-contract-audits.md)


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