# 📐  L2 Spec — Off-Axis Digital Holography Mismatch-Only Spec

**ID:** `L2-071-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-071`](/artifact/l1/L1-071)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41554172

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| H | px | 256 – 4096 |
| W | px | 256 – 4096 |
| Z mm | mm | 1.0 – 500.0 |
| Photon count | — | 10 – 50000 |
| Wavelength nm | nm | 400 – 1550 |
| Tilt angle mrad | — | 1.0 – 50.0 |
| Wavelength drift | — | 0.0 – 0.002 |
| Reference tilt error | — | 0.0 – 2.0 |
| Propagation distance error | — | 0.0 – 5.0 |

## 2. Tolerance (ε)

**Type:** `fn`

```
22.0 + 4.0 * log10(photon_count / 10) - 10.0 * max(0, reference_tilt_error / 2.0)
```

## 3. Difficulty

| Property | Value |
|---|---|
| Difficulty score | 0.5 |
| Delta tier | 5 |

## 4. Fingerprint

`36476feaba60edc6ed9281b7f424f705426dd94726061c04f6f2b93f5c03c351`

## 5. On-chain Registration

- **Chain hash:** `0x1a392f5af7a7074474946a413bffedd7638414f1ffe8cb3428113d0d327f7d78`
- **Chain tx hash:** `0x2fc13bc3e9a21478daddf0a73c3f9e0d5ec307107cd9c29e08c42fb39f904d7b`
- **Chain block:** `41554172`

---

## File Mapping

This bundle consists of: `L2-071-001.md`, `L2-071-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-071-001.md` | Source of truth — edit this | Human or LLM |
| `L2-071-001.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 `L2-071-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._