# 📐  L2 Spec — CASSI Mismatch-Only Spec (KAIST benchmark family)

**ID:** `L2-003` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-003`](/artifact/l1/L1-003)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** None · **Delta tier:** 5
> **⛓ On-chain block:** 41421558

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| H | px | 64 – 2048 |
| W | px | 64 – 2048 |
| N bands | bands | 8 – 128 |
| Mask dx | — | 0.0 – 1.0 |
| Mask dy | — | 0.0 – 1.0 |
| Mask theta | — | 0.0 – 0.15 |
| Noise level | — | 0.001 – 0.1 |
| Mask density | — | 0.3 – 0.7 |
| Disp a1 error | — | 0.0 – 0.05 |
| Disp alpha error | — | 0.0 – 0.3 |

## 2. Tolerance (ε)

**Type:** `fn`

```
25.0 + 2.0 * log2(H / 64) + 1.5 * log10(photon_count / 50)
```

## 3. Difficulty

| Property | Value |
|---|---|
| Delta tier | 5 |

## 4. Fingerprint

`641beec700ce78fb5cf4061eb9f20727f2e7785c21f0c70d687daec0f4d0bfb3`

## 5. On-chain Registration

- **Chain hash:** `0x471e7017692cde623cee2741e751413cfb4752457429f128c0004174fea86896`
- **Chain tx hash:** `0x46f128a3d46613f71a7fbf258669cb7b2ac94ded0a36a3207abc0a634f1e1f40`
- **Chain block:** `41421558`

---

## File Mapping

This bundle consists of: `L2-003.md`, `L2-003.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-003.md` | Source of truth — edit this | Human or LLM |
| `L2-003.json` | Structured metadata for the registry | LLM regenerates from the sections above |

**Prompt for your LLM after editing this Markdown:**

> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.

_This Markdown was auto-synthesized from the catalog row for `L2-003`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._