# 📐 L2 Spec — Ocean Circulation Inverse Modeling — Nominal + Mismatch Specs
**ID:** `L2-419-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-419`](/artifact/l1/L1-419)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.45 · **Delta tier:** 5
> **⛓ On-chain block:** 41555241
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| N argo profiles | — | 100 – 30000 |
| N vertical levels | — | 20 – 100 |
| Assimilation years | — | 1 – 50 |
| Horizontal resolution deg | deg | 0.1 – 2.0 |
## 2. Tolerance (ε)
**Type:** `fn`
```
0.2 + 0.1 * (1.0 / N_Argo_profiles * 3000) ** 0.3
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.45 |
| Delta tier | 5 |
## 4. Fingerprint
`67c7b7d7f8d76e3448018dad088ee035c0d926a3a3a8877ce54a5f3678d53e81`
## 5. On-chain Registration
- **Chain hash:** `0xdddb8149a657f33c7941f19fab95de93f05be60f00be1ca867e2194ea8d1aae9`
- **Chain tx hash:** `0x25d03041ebf120613778a8102521ba1792d0102f2777ad391cd9c468ebd2d304`
- **Chain block:** `41555241`
---
## File Mapping
This bundle consists of: `L2-419-001.md`, `L2-419-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-419-001.md` | Source of truth — edit this | Human or LLM |
| `L2-419-001.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 `L2-419-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._