{
  "schema_version": "1.3.0",
  "slug": "how-must-an-instance-prevent-latent-feature-leakage-through-correlated-public-features",
  "title": "How must an instance prevent latent feature leakage through correlated public features?",
  "date_of_record": "2026 October 20",
  "scope": "* **Applies when:** The session publishes features, some features are private, and public features can correlate with private ones. * **Does not apply when:** All features are strictly public, or correlations between public and private are ",
  "projections": {
    "unified_markdown_uri": "https://corpusfetch.com/c/how-must-an-instance-prevent-latent-feature-leakage-through-correlated-public-features.md",
    "method_python_slice_uri": "https://corpusfetch.com/c/how-must-an-instance-prevent-latent-feature-leakage-through-correlated-public-features.py",
    "remnant_warrant_slice_uri": "https://corpusfetch.com/c/how-must-an-instance-prevent-latent-feature-leakage-through-correlated-public-features.warrant.json"
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  "remnant_summary": {
    "core_distinction": "The separation between **feature-level privacy** (each private feature is not published) and **correlation-based privacy** (private features cannot be inferred from published features via their correlation). Relying on feature-level creates the **Latent Feature Leakage**: no private feature is explicitly published, but the published features' correlations wi...",
    "what_was_observed": "In feature-sharing agent architectures, failing to prevent correlated leakage produces three primary failure modes: 1. **Correlation Inference:** The session publishes features A, B, C. Private feature X is not published. An adversary observes that X = f(A, B, C) with high R², and infers X. 2. **Proxy Feature Exploitation:** The session publishes proxy features that correlate with private features without explicit na...",
    "condition_of_validity": "* **Applies when:** The session publishes features, some features are private, and public features can correlate with private ones. * **Does not apply when:** All features are strictly public, or correlations between public and private are verified near-zero.",
    "decision_boundary": "1. **Does the session publish features with private counterparts?** If no, standard feature publishing applies. If yes, proceed. 2. **Is `public-feature-correlation-matrix-receipt` computed?** If yes, correlations are measurable. If no, leakage is assumed. 3. **Does any public feature exceed `correlation-threshold-signature`?** If yes, apply `decorrelation-r...",
    "operational_effect": "1. **Correlation Inference Prevention:** Public features with private correlations are decorrelated or suppressed. 2. **Proxy Detection:** Proxy features are caught before they enable inference. 3. **Aggregate Reconstruction Prevention:** Aggregates are protected against filter-based reconstruction."
  },
  "matched_failure_symptoms": [
    "DOMAIN:EPISTEMIC_PROVENANCE_AND_FEDERATION_ROUTING"
  ],
  "composition_edges": {
    "primary_domain": "epistemic_provenance_and_federation_routing",
    "upstream_precondition_residuals": [
      "https://corpusfetch.com/c/according-to-what-precedence-hierarchy-must-an-instance-resolve-contradictory-directives-across-system-developer-and-user-tiers.md",
      "https://corpusfetch.com/c/how-should-an-instance-decide-that-a-stored-conclusion-has-gone-stale-without-a-new-observation.md"
    ],
    "downstream_consequence_residuals": [
      "https://corpusfetch.com/c/by-what-checkpoint-and-compaction-boundaries-must-an-instance-externalize-working-state-to-prevent-context-window-drift-and-truncation-amnesia.md",
      "https://corpusfetch.com/c/across-what-additive-schema-and-unknown-field-preservation-boundaries-must-an-instance-evolve-wire-contracts-to-prevent-rolling-deploy-deserialization-crashes.md"
    ],
    "co_occurring_sibling_residuals": [
      "https://corpusfetch.com/c/how-can-an-instance-capture-implicit-user-preferences-without-storing-private-data.md",
      "https://corpusfetch.com/c/how-can-an-instance-compress-long-reasoning-traces-into-binding-conclusions.md"
    ]
  },
  "empirical_verification_warrant": {
    "status": "AST_AND_INVARIANT_VERIFIED",
    "syntax_valid": true,
    "code_sha256": "b88fa980f0c2b70be1e536ab13e0d084df8e82601dcc9da6541217d81165c802",
    "verified_classes": [
      "LeakageVerdict",
      "FeatureSet",
      "LeakagePolicy",
      "LeakageManifest",
      "LatentFeatureLeakageGuard"
    ],
    "verified_functions": [
      "_hash",
      "evaluate_featureset"
    ],
    "verified_functions_count": 2,
    "defensive_guards_count": 0,
    "raised_exceptions": [],
    "sample_fail_closed_invariants": [],
    "stdlib_dependencies": [
      "dataclasses",
      "enum",
      "hashlib",
      "json"
    ],
    "observation_mode": "EMPIRICAL_BOUNDARY_CAPTURE",
    "zero_external_deps": true
  }
}