# 📐 L2 Spec — Bone Fracture Detection from Radiograph (PWDR) — Spec Skeleton
**ID:** `L2-526-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-526`](/artifact/l1/L1-526)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41553390
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 1024 – 4096 |
| W | px | 1024 – 4096 |
| Kvp | — | [NEEDS_HAND_AUTHORING: bounds] |
| Mas | — | [NEEDS_HAND_AUTHORING: bounds] |
| Snr db | dB | [NEEDS_HAND_AUTHORING: bounds] |
| View count | — | 1 – 4 |
| Anatomic region | — | [NEEDS_HAND_AUTHORING: bounds] |
| Rotation artifact | — | [NEEDS_HAND_AUTHORING: bounds] |
| Pixel resolution um | µm | [NEEDS_HAND_AUTHORING: bounds] |
| Overlapping structures | — | [NEEDS_HAND_AUTHORING: bounds] |
| Growth plate confounder | — | [NEEDS_HAND_AUTHORING: bounds] |
| Soft tissue swelling obscuring | — | [NEEDS_HAND_AUTHORING: bounds] |
| Manual radiologist disagreement | — | [NEEDS_HAND_AUTHORING: bounds] |
## 2. Tolerance (ε)
**Type:** `fn`
```
0.85_accuracy
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.5 |
| Delta tier | 5 |
## 4. Fingerprint
`d9c0441292d4acedda05c3acf99b2884c05bcc6a07449f6a5fa7b3f811588d9d`
## 5. On-chain Registration
- **Chain hash:** `0x97017e5b4c3fbe59ee33ac257cd0401c95f4ff221ed93c27267e411076ebb9e6`
- **Chain tx hash:** `0x3aa2ce77995a9f5b17bad42865ec42f39e7b6377dc54fa887e92df487e635e9e`
- **Chain block:** `41553390`
---
## File Mapping
This bundle consists of: `L2-526-001.md`, `L2-526-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-526-001.md` | Source of truth — edit this | Human or LLM |
| `L2-526-001.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 `L2-526-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._