# 📐 L2 Spec — J2 Plasticity — von Mises rate-independent Mismatch-Only Spec
**ID:** `L2-216-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-216`](/artifact/l1/L1-216)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.48 · **Delta tier:** 5
> **⛓ On-chain block:** 41554014
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| N dof | — | 100 – 1000000 |
| N inc | — | 10 – 10000 |
| Snr db | dB | 0 – 40 |
| E error | — | 0.0 – 0.1 |
| Sigma y error | — | 0.0 – 0.1 |
| H hardening error | — | 0.0 – 0.2 |
## 2. Tolerance (ε)
**Type:** `fn`
```
16.0 + 0.3*SNR_dB - 30.0*sigma_y_error - 15.0*H_hardening_error - 30.0*E_error
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.48 |
| Delta tier | 5 |
## 4. Fingerprint
`50b3aab35a89d23d0c4adac1dfe2a90816c0a1cf67b217a6bda6cf1fbfe597fb`
## 5. On-chain Registration
- **Chain hash:** `0xc0e9d3b58861edec188dbb69f392fec38cdc4342c6693aac593c83b46d42ed83`
- **Chain tx hash:** `0x6d9f78f86e6ed4e330f21f16567f8b11af47159b3c44aae50c3bdc340161304f`
- **Chain block:** `41554014`
---
## File Mapping
This bundle consists of: `L2-216-001.md`, `L2-216-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-216-001.md` | Source of truth — edit this | Human or LLM |
| `L2-216-001.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 `L2-216-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._