# 📐 L2 Spec — Coded-Exposure Mismatch-Only Spec
**ID:** `L2-077-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-077`](/artifact/l1/L1-077)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.45 · **Delta tier:** 5
> **⛓ On-chain block:** 41554174
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 256 – 4096 |
| W | px | 256 – 4096 |
| T ms | ms | 5 – 200 |
| Velocity px | — | 1.0 – 100.0 |
| Photon count | — | 50 – 10000 |
| Saturation clip | — | 0.0 – 0.1 |
| Code length bits | — | 16 – 128 |
| Motion velocity error | — | 0.0 – 0.5 |
| Motion direction error | — | 0.0 – 0.3 |
| Exposure duration error | — | 0.0 – 0.2 |
## 2. Tolerance (ε)
**Type:** `fn`
```
22.0 + 3.0 * log10(photon_count / 50) - 10.0 * motion_velocity_error - 10.0 * motion_direction_error / 0.3
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.45 |
| Delta tier | 5 |
## 4. Fingerprint
`a49a19f6b728afafabc96eb1208cde491e95d4afaf4c2c513ccdd18fb5602d16`
## 5. On-chain Registration
- **Chain hash:** `0x2ba890218a0da3d2197b3f25883d3128eb9b8a84e2f7dd32bb3f04bd53297429`
- **Chain tx hash:** `0x595b0c877cdc51b1d607ac63f336df886ccf4dee7bbd79e947c61ca6a9ec92fa`
- **Chain block:** `41554174`
---
## File Mapping
This bundle consists of: `L2-077-001.md`, `L2-077-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-077-001.md` | Source of truth — edit this | Human or LLM |
| `L2-077-001.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 `L2-077-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._