# 📐 L2 Spec — IRMS delta-value Spec (bracketing family)
**ID:** `L2-148-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-148`](/artifact/l1/L1-148)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.55 · **Delta tier:** 5
> **⛓ On-chain block:** 41554232
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| Flow drift | — | 0.0 – 0.05 |
| N replicate | — | 1 – 100 |
| Peak tailing | — | 0.0 – 0.01 |
| Memory effect | — | 0.0 – 0.1 |
| Amp nonlinearity | — | 0.0 – 0.001 |
| Sample size mismatch | — | 0.0 – 0.5 |
## 2. Tolerance (ε)
**Type:** `fn`
```
0.01 + 5 * memory_effect + 1e4 * amp_nonlinearity + 50 * peak_tailing + 0.5 * flow_drift
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.55 |
| Delta tier | 5 |
## 4. Fingerprint
`334d700402d48635446234b0f4f0742393a81efd0c4f56c57f5f8ffe5dc0ecb6`
## 5. On-chain Registration
- **Chain hash:** `0x35f014c21eaae59b4f0c281980fbf1b8cdaeadcc4fb0042a85a1dd2eacbee515`
- **Chain tx hash:** `0xaa4f7da93877f8d9fcf4601177867b058c06447d674a4f65bfcd0ed38b14e0d9`
- **Chain block:** `41554232`
---
## File Mapping
This bundle consists of: `L2-148-001.md`, `L2-148-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-148-001.md` | Source of truth — edit this | Human or LLM |
| `L2-148-001.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 `L2-148-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._