| # Institutional Evidence (SAG) |
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| The **Sovereign Academic Graph (SAG)** is the institutional evidence layer of the Aegis-Graph protocol. It integrates locally maintained institutional indices with global public registries (such as ROR and OpenAlex) to provide the necessary context for credential auditing. |
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| ## 📊 Data Topology |
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| The SAG is not a "judgment database" that proves a credential's authenticity; rather, it is a dynamic model that provides institutional background evidence. |
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| ### Core Evidence Sources |
| | Source | Role | |
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| | **Local Index** | Caches metadata for high-trust institutions, blacklist aliases, and known fraud patterns. | |
| | **ROR** | Provides standardized identities (ROR IDs) and operational status for global research organizations. | |
| | **OpenAlex** | Provides scholarly output background and institutional impact metrics as supporting evidence. | |
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| ## 🏛️ Evidence Logic |
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| During the audit process, the SAG is used to answer critical questions: |
| 1. **Institutional Existence**: Does the institution have a record in recognized global registries? |
| 2. **Lifecycle Consistency**: Is the credential issuance date within the institution's operational lifespan? |
| 3. **Status Validation**: Is the institution currently active, or has it been flagged for revocation or fraud? |
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| > [!IMPORTANT] |
| > **Key Clarification:** The presence of an institution in registries like ROR is evidence that the organization exists, but it is **not** proof that a specific credential issued in its name is authentic. |
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| ## ⚡ Indexing & Matching |
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| To ensure accuracy in evidence resolution, Aegis-Graph utilizes several strategies: |
| 1. **Normalization**: Institutional names are standardized to eliminate variations in spelling or symbols. |
| 2. **Multi-Factor Matching**: Cross-references geographic location, founding year, and official domains. |
| 3. **Evidence Weighting**: Matching results are assigned a confidence score, which serves as a key input for the LogicAuditor's final decision. |
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| *Return to [Documentation Home](README.md)* |
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