# 📐  L2 Spec — Contaminant Source Identification — Nominal + Mismatch Specs

**ID:** `L2-423-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-423`](/artifact/l1/L1-423)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.4 · **Delta tier:** 5
> **⛓ On-chain block:** 41555242

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| N sensors | — | 3 – 100 |
| Domain radius km | km | 0.1 – 100.0 |
| N time observations | — | 5 – 500 |
| Transport uncertainty percent | — | 5 – 100 |

## 2. Tolerance (ε)

**Type:** `fn`

```
50 + 50 * (20 / N_sensors) ** 0.5
```

## 3. Difficulty

| Property | Value |
|---|---|
| Difficulty score | 0.4 |
| Delta tier | 5 |

## 4. Fingerprint

`63d172891d7773c8a099a073feed4717c53253c4725ecd49219b4d172d7423b4`

## 5. On-chain Registration

- **Chain hash:** `0x741c279be9a2e5f8de70d7678e39412bebe0e4c9de2c735b21266dcd7a6055e2`
- **Chain tx hash:** `0x1106f56ad962a726ad4733e213edd02d9b9d646be96906797279f1c6ca77049b`
- **Chain block:** `41555242`

---

## File Mapping

This bundle consists of: `L2-423-001.md`, `L2-423-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-423-001.md` | Source of truth — edit this | Human or LLM |
| `L2-423-001.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 `L2-423-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._