{
  "schema_version": "1.3.0",
  "slug": "what-time-travel-attestation-invariants-prove-past-state-claims-after-the-fact",
  "title": "What time-travel attestation invariants prove past state claims after the fact?",
  "date_of_record": "2026 October 20",
  "scope": "* **Applies when:** Past state must be provable after the fact, current state has changed since then, and audits or disputes depend on the historical truth. * **Does not apply when:** State is permanently retained without change, or no one ",
  "projections": {
    "unified_markdown_uri": "https://corpusfetch.com/c/what-time-travel-attestation-invariants-prove-past-state-claims-after-the-fact.md",
    "method_python_slice_uri": "https://corpusfetch.com/c/what-time-travel-attestation-invariants-prove-past-state-claims-after-the-fact.py",
    "remnant_warrant_slice_uri": "https://corpusfetch.com/c/what-time-travel-attestation-invariants-prove-past-state-claims-after-the-fact.warrant.json"
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  "token_profile": {
    "full_markdown_tokens": 1038,
    "python_slice_tokens": 280,
    "warrant_slice_tokens": 220
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  "remnant_summary": {
    "core_distinction": "The separation between **current state observation** (what the system says is true now) and **past state attestation** (cryptographic proof of what was true at a past epoch). Relying on current observations creates the **Retrospective Fog**: a dispute arises about a past decision, and the session can only show current state, which has changed since the decis...",
    "what_was_observed": "In auditable agent architectures, failing to preserve time-travel attestations produces three primary failure modes: 1. **Decision Rationale Loss:** An agent made a decision six months ago based on then-current data. The data has changed, and the agent cannot prove the decision was valid given the old data. 2. **Dispute Ambiguity:** Two parties dispute a past transaction. Neither can produce evidence of the state at ...",
    "condition_of_validity": "* **Applies when:** Past state must be provable after the fact, current state has changed since then, and audits or disputes depend on the historical truth. * **Does not apply when:** State is permanently retained without change, or no one ever needs to prove past state.",
    "decision_boundary": "1. **Is there a pending audit, dispute, or compliance check about past state?** If no, standard state tracking applies. If yes, proceed. 2. **Is there an `epoch_state_snapshot_receipt` for the relevant epoch?** If yes, use it to prove past state. If no, the past state cannot be proven. 3. **Is the `transparency_log_inclusion_proof` present for the snapshot?*...",
    "operational_effect": "1. **Retrospective Provability:** Past state is cryptographically attested, enabling post-hoc disputes. 2. **Tamper-Evidence:** Transparency logs prevent retroactive modification of snapshots. 3. **Audit Replay:** Past state and decisions can be independently verified by replay."
  },
  "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": "bb9b4ff9c528358a6db55849d828ba738371a582915a246cc75f46fbcdb38d37",
    "verified_classes": [
      "TimeTravelVerdict",
      "StateSnapshot",
      "TimeTravelPolicy",
      "TimeTravelManifest",
      "TimeTravelAttestationGuard"
    ],
    "verified_functions": [
      "_hash",
      "evaluate_snapshot"
    ],
    "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
  }
}