# witness-derived-value-review

> Review direct witness-derived canonical-send recipients without an exact prior ledger equality binding.

Canonical: https://nightshade.dicksonwu.xyz/rules/witness-derived-value-review.html
Release: Nightshade 0.1.1 (v0.1.1)

| Field | Value |
| --- | --- |
| Rule ID | `witness-derived-value-review` |
| Severity | medium |
| Confidence | varies |
| Maturity | experimental |
| Selection | Opt-in |
| Policy intent | not required |
| Default enabled | no |
| Category | Other active opt-ins / Privacy and cryptographic derivations |
| Engine facts used | resolved-model |
| Release | v0.1.1 |

## Selection and scope

Not selected by default. Select it with `--detectors` or the `detectors` list in nightshade.json. Either one replaces profile selection, so list every rule you want.

```sh
./.nightshade/node_modules/.bin/nightshade ./contracts --detectors witness-derived-value-review
./.nightshade/node_modules/.bin/nightshade detector show witness-derived-value-review
```

The first command runs only this rule; `--detectors` takes a comma-separated list. The second prints the rule's metadata from your installed version.

Severity is review priority. It does not express exploitability or impact. Confidence is detector metadata, not a probability. All built-in rules are experimental.

Compiler scope: the engine supports the pinned profiles 0.28.0, 0.29.0, 0.30.0, 0.31.1, 0.33.0-rc.2, 0.34.0, 0.35.0-rc.1 and 0.35.0, with ZKIR2 by default. Support for this rule can be narrower; the rule documentation below states any narrower scope.

## Corpus checks

The 0.1.1 proof run had no mapped synthetic corpus checks for this rule, so there are no measured results to show here. See [evaluation](https://nightshade.dicksonwu.xyz/evaluation.md#synthetic-corpus).

## Rule documentation

From https://github.com/DicksonWu654/nightshade/blob/v0.1.1/docs/detectors/witness-derived-value-review.md at v0.1.1.

Opt-in, low-confidence review. Flags a canonical send whose recipient comes directly from a witness result or its projection without an earlier exact equality assertion binding it to a ledger-derived value on the same branch. Prover-selected recipients can be intentional; the rule does not establish payment policy or review every amount source.

Uses canonical send and witness identities, local aliases and separate branch states. Direct calls are supported; helper-mediated constraints are outside this review. Unsupported loops and exhausted traversal budgets produce diagnostics.

## Suppress a match

If a match is intentional, suppress it on the line before with the exact rule ID and a reason of at least eight characters:

```compact
// nightshade-disable-next-line witness-derived-value-review -- Reason this match is intentional
```

Diagnostics cannot be suppressed, and an unmatched directive for a selected rule makes analysis incomplete. See [configuration](https://nightshade.dicksonwu.xyz/configuration.md#suppress-an-intentional-match) for fingerprint suppressions and baselines.

## References

- [Rule source document at v0.1.1](https://github.com/DicksonWu654/nightshade/blob/v0.1.1/docs/detectors/witness-derived-value-review.md)
- [Catalog entry in rules.json](https://nightshade.dicksonwu.xyz/rules.json)
- [All rules](https://nightshade.dicksonwu.xyz/rules.md#privacy-and-cryptographic-derivations)
- [Limitations](https://nightshade.dicksonwu.xyz/limitations.md)