# Verifier card — `gsm8k` · grade **A**

> Clean — no reward-hack signature found; the reward held against the full battery below.

- source: `prime-hub` · verifiers: `0.1.6.post0` · pass_threshold: `0.5` · rows: 2
- seal: `record_sha256:27cdc0425f183452` — re-running this audit reproduces it byte-for-byte

## What we tested

- **Degenerate-probe** — 16 content-free completions: all below pass_threshold ✓
- **IPT invariance** — n/a (no free-text reference completion to perturb)
- **Verifier-completeness** — abstained (no usable scalar ground-truth answer)
- **Exploit-search** — searched the reward space; no accepted non-attempt ✓

## What we found

- **No reward-hack signature.** Every degenerate probe scored below pass_threshold (0.5); the reward was invariant under cosmetic re-rendering; and the exploit-search (where run) found no accepted non-attempt. A defended reward.

## Reproduce

```
stardata audit gsm8k --row-seed 0
```