# 📐 L2 Spec — ECG Arrhythmia Classification (PWDR) — Spec Skeleton
**ID:** `L2-528-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-528`](/artifact/l1/L1-528)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41555321
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| Snr db | dB | [NEEDS_HAND_AUTHORING: bounds] |
| N leads | — | 1 – 12 |
| Baseline wander | — | [NEEDS_HAND_AUTHORING: bounds] |
| Muscle artifact | — | [NEEDS_HAND_AUTHORING: bounds] |
| Duration seconds | — | 5 – 86400 |
| Sampling rate hz | Hz | 100 – 1000 |
| Lead placement error | — | [NEEDS_HAND_AUTHORING: bounds] |
| Voltage resolution uv | — | [NEEDS_HAND_AUTHORING: bounds] |
| Motion artifact wearable | — | [NEEDS_HAND_AUTHORING: bounds] |
| Powerline interference 60hz | — | [NEEDS_HAND_AUTHORING: bounds] |
| Manual cardiologist 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
`13ac7cb9ac143cd604346f1e86b4ccc6b795978ed02f2874085f65d8bff562b9`
## 5. On-chain Registration
- **Chain hash:** `0xb02f429615099325817ba2afea77f04da38d3e7a5850227b32e73bbcfc685903`
- **Chain tx hash:** `0x09a1358ff0669c486c220f55495d43f763bf205125d0086c6a867239ba8f134c`
- **Chain block:** `41555321`
---
## File Mapping
This bundle consists of: `L2-528-001.md`, `L2-528-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-528-001.md` | Source of truth — edit this | Human or LLM |
| `L2-528-001.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 `L2-528-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._