# 📐 L2 Spec — Compressed Ultrafast Photography (CUP) — trillion fps imaging Mismatch-Only Spec
**ID:** `L2-151-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-151`](/artifact/l1/L1-151)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.55 · **Delta tier:** 5
> **⛓ On-chain block:** 41554232
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 64 |
| W | px | 64 |
| N frames | — | 20 – 500 |
| Cross talk | — | 0.0 – 0.3 |
| Photon count | — | 10 – 5000 |
| Dmd mask drift | — | 0.0 – 0.3 |
| Low photon regime | — | 0.0 – 1.0 |
| Streak nonlinearity | — | 0.0 – 0.3 |
## 2. Tolerance (ε)
**Type:** `fn`
```
14.0 + 2.0 * log10(photon_count / 10) - 10.0 * dmd_mask_drift - 8.0 * streak_nonlinearity - 6.0 * low_photon_regime
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.55 |
| Delta tier | 5 |
## 4. Fingerprint
`de61cf7debee6025cba19337ac088fa6f025aecec7a166e39ddf584f28cdf3bc`
## 5. On-chain Registration
- **Chain hash:** `0xc0281c6ce8cfc4b4ef229f97aa57b248f8b145487603c35e598767859743c049`
- **Chain tx hash:** `0xc5fd266d0a391c2b1056d7e4e317bfb56ff91d0be9c8bd75f575ce71f347eb45`
- **Chain block:** `41554232`
---
## File Mapping
This bundle consists of: `L2-151-001.md`, `L2-151-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-151-001.md` | Source of truth — edit this | Human or LLM |
| `L2-151-001.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 `L2-151-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._