# 📐 L2 Spec — Functional MRI (BOLD) Mismatch-Only Spec
**ID:** `L2-043-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-043`](/artifact/l1/L1-043)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41553375
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 32 |
| W | px | 32 |
| Z | — | 16 – 100 |
| Tr s | s | 0.5 – 5.0 |
| Te ms | ms | 15 – 80 |
| Snr db | dB | 0.0 – 30.0 |
| Motion | — | 0.0 – 0.5 |
| N frames | — | 50 – 1000 |
| Multi echo bias | — | 0.0 – 0.2 |
| Acquisition jitter | — | 0.0 – 0.1 |
| Physiological noise | — | 0.0 – 0.2 |
| Susceptibility artifact | — | 0.0 – 0.3 |
## 2. Tolerance (ε)
**Type:** `fn`
```
5.0 + 0.3 * SNR_dB - 15.0 * physiological_noise - 10.0 * motion - 8.0 * susceptibility_artifact
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.5 |
| Delta tier | 5 |
## 4. Fingerprint
`24c5f25c29ffa555ac287339abdb15c41a26ad5d1031aa6b5dac60e81d05121f`
## 5. On-chain Registration
- **Chain hash:** `0x006b2a9543ee141bed365f34034aa67438a715b59dad8ffeb5a4e57189503765`
- **Chain tx hash:** `0x4f0e90dc08661d2845d3698abcfc7c3c86a3f7bcb879d53d082822c62cd72279`
- **Chain block:** `41553375`
---
## File Mapping
This bundle consists of: `L2-043-001.md`, `L2-043-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-043-001.md` | Source of truth — edit this | Human or LLM |
| `L2-043-001.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 `L2-043-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._