# SPRINT_4600 SUMMARY: SBOM Lineage & BYOS Ingestion

## Program Overview

| Field | Value |
|-------|-------|
| **Program ID** | 4600 |
| **Theme** | SBOM Operations: Historical Tracking, Lineage, and Ingestion |
| **Priority** | P2 (Medium) |
| **Total Effort** | ~5 weeks |
| **Advisory Source** | 19-Dec-2025 - Stella Ops candidate features mapped to moat strength |

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## Strategic Context

SBOM storage is becoming table stakes. Differentiation comes from:
1. **Lineage ledger** — Historical tracking with semantic diff
2. **BYOS ingestion** — Accept external SBOMs into the analysis pipeline

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## Sprint Breakdown

| Sprint ID | Title | Effort | Moat |
|-----------|-------|--------|------|
| 4600_0001_0001 | SBOM Lineage Ledger | 3 weeks | 3 |
| 4600_0001_0002 | BYOS Ingestion Workflow | 2 weeks | 3 |

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## Dependencies

- **Requires**: SbomService (exists)
- **Requires**: Graph module (exists)
- **Requires**: SPRINT_4600_0001_0001 for BYOS

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## Outcomes

1. SBOM versions are chained by artifact identity
2. Historical queries and diffs are available
3. External SBOMs can be uploaded and analyzed
4. Lineage relationships are queryable

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## Moat Strategy

> "Make the ledger valuable via **semantic diff, evidence joins, and provenance** rather than storage."

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**Sprint Series Status:** TODO

**Created:** 2025-12-22