{
  "schema_version": "1.3.0",
  "slug": "what-write-time-corruption-signatures-must-be-detected-before-persisting-state-to-external-memory",
  "title": "What write-time corruption signatures must be detected before persisting state to external memory?",
  "date_of_record": "2026 October 20",
  "scope": "* **Applies when:** The external memory layer can experience silent corruption (bit rot, partial writes, serialization drift) that is not automatically detected by the storage layer's own integrity checks. * **Does not apply when:** The sto",
  "projections": {
    "unified_markdown_uri": "https://corpusfetch.com/c/what-write-time-corruption-signatures-must-be-detected-before-persisting-state-to-external-memory.md",
    "method_python_slice_uri": "https://corpusfetch.com/c/what-write-time-corruption-signatures-must-be-detected-before-persisting-state-to-external-memory.py",
    "remnant_warrant_slice_uri": "https://corpusfetch.com/c/what-write-time-corruption-signatures-must-be-detected-before-persisting-state-to-external-memory.warrant.json"
  },
  "token_profile": {
    "full_markdown_tokens": 1027,
    "python_slice_tokens": 232,
    "warrant_slice_tokens": 220
  },
  "remnant_summary": {
    "core_distinction": "The separation between **pre-write validation** (the state was correct in memory before serialization) and **post-write verification** (the state as written to storage matches what the instance intended). Relying solely on pre-write validation creates the **Silent Corruption Bloom**: a bit flip in the storage controller, a partial write due to a network blip...",
    "what_was_observed": "In distributed persistence architectures, failing to detect write-time corruption produces three primary failure modes: 1. **Bit-Rot Transposition:** The storage layer flips a bit in a critical field (e.g., a timestamp or a hash). The successor reads a subtly wrong value and propagates it through downstream logic. 2. **Partial Write Amnesia:** The write is interrupted mid-stream (network partition, process crash). Ha...",
    "condition_of_validity": "* **Applies when:** The external memory layer can experience silent corruption (bit rot, partial writes, serialization drift) that is not automatically detected by the storage layer's own integrity checks. * **Does not apply when:** The storage layer provides verifiable end-to-end integrity (e.g., checksummed writes with ECC, or a transactional database with...",
    "decision_boundary": "1. **Was a `pre_write_state_hash` computed before writing?** If no, the instance has no ground truth. It must not proceed. 2. **Was a `post_write_readback_hash` computed and compared immediately after writing?** If no, silent corruption cannot be detected. The instance must perform readback. 3. **Do the pre-write and post-write hashes match?** If no, silent ...",
    "operational_effect": "1. **Corruption Detection:** Catches silent write failures before the successor inherits corrupted state, preventing cascading errors. 2. **Serialization Consistency:** Detects format drift by binding the hash to the exact serialization library version. 3. **Atomicity Proof:** Provides cryptographic proof of atomic writes, distinguishing partial writes from ..."
  },
  "matched_failure_symptoms": [
    "OOM_KILL_OR_MEMORY_EXHAUSTION"
  ],
  "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": "e286a952aaa2980bdb1d9e8790df4f0bb6a93388cd4e04b3274baf31b80909d9",
    "verified_classes": [
      "WriteVerdict",
      "WriteOperation",
      "WriteContext",
      "WriteManifest",
      "WriteIntegrityGuard"
    ],
    "verified_functions": [
      "_hash",
      "evaluate_write"
    ],
    "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
  }
}