# 📐 L2 Spec — Eddy Currents — conductor inversion from induced fields Mismatch-Only Spec
**ID:** `L2-238-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-238`](/artifact/l1/L1-238)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.48 · **Delta tier:** 5
> **⛓ On-chain block:** 41553991
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 32 – 1024 |
| W | px | 32 – 1024 |
| Z | — | 8 – 512 |
| N pos | — | 4 – 1024 |
| Snr db | dB | 0 – 40 |
| N freqs | — | 1 – 256 |
| Mu r error | — | 0.0 – 0.1 |
| Sigma error | — | 0.0 – 0.1 |
| Coil pos error | — | 0.0 – 0.02 |
| Coil lift off error | — | 0.0 – 0.5 |
## 2. Tolerance (ε)
**Type:** `fn`
```
15.0 + 0.3*SNR_dB - 20.0*sigma_error - 10.0*mu_r_error - 8.0*coil_lift_off_error
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.48 |
| Delta tier | 5 |
## 4. Fingerprint
`0166aa7124970e8fe30e2faa0940e2678d925335bc8384cd037af80113f58e81`
## 5. On-chain Registration
- **Chain hash:** `0xa40435a05422f3479dd337bbc5a7e0caa83efc11558b11b388754a71002bf0c2`
- **Chain tx hash:** `0x7aee5d2e91ce741edce0e762bd2c02fc3cf6611dec815461a696dd37ffbac930`
- **Chain block:** `41553991`
---
## File Mapping
This bundle consists of: `L2-238-001.md`, `L2-238-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-238-001.md` | Source of truth — edit this | Human or LLM |
| `L2-238-001.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 `L2-238-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._