# 📐 L2 Spec — PillCam-SPECTRA Bleeding-Region Detection (PWDR) — Spec Skeleton
**ID:** `L2-512-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-512`](/artifact/l1/L1-512)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41553376
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 128 – 1024 |
| W | px | 128 – 1024 |
| Snr db | dB | 10.0 – 38.0 |
| Tau bvf | — | [NEEDS_HAND_AUTHORING: bounds] |
| Tau hbo2 | — | [NEEDS_HAND_AUTHORING: bounds] |
| Tau edema | — | [NEEDS_HAND_AUTHORING: bounds] |
| N wavelengths | — | 3 – 16 |
| Lambda range nm | nm | [NEEDS_HAND_AUTHORING: bounds] |
| Tau lipid polyp | — | [NEEDS_HAND_AUTHORING: bounds] |
| Tau total blood | — | [NEEDS_HAND_AUTHORING: bounds] |
| Tau scatter neop | — | [NEEDS_HAND_AUTHORING: bounds] |
| Tau scatter polyp | — | [NEEDS_HAND_AUTHORING: bounds] |
| Tau oxy ratio neop | — | [NEEDS_HAND_AUTHORING: bounds] |
| Working distance mm | mm | [NEEDS_HAND_AUTHORING: bounds] |
| Scattering anisotropy g | g | [NEEDS_HAND_AUTHORING: bounds] |
| Source detector distance mm | mm | [NEEDS_HAND_AUTHORING: bounds] |
| Motion induced label flicker | — | 0.0 – 0.4 |
| Between region smoothing artifact | — | 0.0 – 0.3 |
| Threshold calibration uncertainty | — | 0.0 – 0.3 |
| Capsule orientation mucosal assignment | — | 0.0 – 0.4 |
## 2. Tolerance (ε)
**Type:** `fn`
```
0.85_accuracy
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.5 |
| Delta tier | 5 |
## 4. Fingerprint
`17b9a8ae477cb823d1f546289ee4659312fc78e6976f9a4cddf77b606245d538`
## 5. On-chain Registration
- **Chain hash:** `0x50b01d90f31568da380b02de04c194cdbbc410e59a0c582e85453105a8a2f995`
- **Chain tx hash:** `0x2c67dc668b770eaab13440a2cca9c61786c7e23ae54b04ed5e8b1aa51635de72`
- **Chain block:** `41553376`
---
## File Mapping
This bundle consists of: `L2-512-001.md`, `L2-512-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-512-001.md` | Source of truth — edit this | Human or LLM |
| `L2-512-001.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 `L2-512-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._