# 📐 L2 Spec — Cosmic Ray Propagation Inversion — Nominal + Mismatch Specs
**ID:** `L2-376-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-376`](/artifact/l1/L1-376)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.3 · **Delta tier:** 5
> **⛓ On-chain block:** 41555181
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| D 0 cm2 s | s | 10000000000000000000000000000 – 100000000000000000000000000000 |
| Z halo kpc | — | 2.0 – 8.0 |
| Solar phi gv | — | 0.3 – 1.5 |
| Delta diffusion | — | 0.2 – 0.6 |
## 2. Tolerance (ε)
**Type:** `fn`
```
1.0 + 0.3 * (solar_phi_GV - 0.5) ** 2
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.3 |
| Delta tier | 5 |
## 4. Fingerprint
`1199715e152a72341f8c4f62f4f6829f7b5644490d7545838fabb3517a609e77`
## 5. On-chain Registration
- **Chain hash:** `0x3b1ef6b48d8f520eca37646fd535db8818357761c8c84f7673efd53a0d0c3991`
- **Chain tx hash:** `0x44fe0a4b0ab920ddfa2274e8b374c827a3e231d4232fd57b9413e26ba5312157`
- **Chain block:** `41555181`
---
## File Mapping
This bundle consists of: `L2-376-001.md`, `L2-376-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-376-001.md` | Source of truth — edit this | Human or LLM |
| `L2-376-001.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 `L2-376-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._