# 📐 L2 Spec — Optical Coherence Elastography (OCE) — Spec Skeleton
**ID:** `L2-508-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-508`](/artifact/l1/L1-508)
> **🎯 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 – 2048 |
| W | px | 128 – 2048 |
| Z | — | 64 – 1024 |
| Snr db | dB | 5.0 – 40.0 |
| N frames | — | 10 – 1000 |
| Loading mode | — | [NEEDS_HAND_AUTHORING: bounds] |
| Wavelength nm | nm | 800 – 1700 |
| Oct phase noise | — | 0.0 – 0.3 |
| Loading amplitude | — | 1e-09 – 0.0001 |
| Tissue anisotropy | — | 0.0 – 0.4 |
| Axial resolution um | µm | 1 – 50 |
| Density uncertainty | — | 0.0 – 0.2 |
| Loading frequency hz | Hz | 10 – 20000 |
| Lateral resolution um | µm | 2 – 50 |
| Scatter decorrelation | — | 0.0 – 0.4 |
| Loading calibration error | — | 0.0 – 0.3 |
| Boundary condition uncertainty | — | 0.0 – 0.3 |
## 2. Tolerance (ε)
**Type:** `fn`
```
24.0
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.5 |
| Delta tier | 5 |
## 4. Fingerprint
`56d4cd84774f36e838d669e2c2493cecbeab9da244bb81373e4b44768a2fdef2`
## 5. On-chain Registration
- **Chain hash:** `0xd1f52391b68ea8a3265d75681d40a1b5d86d592cee9d3fc8ee841a4dd67e292a`
- **Chain tx hash:** `0x6cee22a5ab205a583ff256d7a11a50e73273a1aa7882549f68235e3b2be248f9`
- **Chain block:** `41553376`
---
## File Mapping
This bundle consists of: `L2-508-001.md`, `L2-508-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-508-001.md` | Source of truth — edit this | Human or LLM |
| `L2-508-001.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 `L2-508-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._