# Stage389 — Independent Assessment Package Dual External Timestamp Anchoring & Verification Gate 日本語： **第三者評価パッケージ二重外部タイムスタンプ・アンカー／検証ゲート** Stage389 extends Stage388 without modifying the Stage388 canonical evidence package. The purpose of Stage389 is to bind the finalized Stage388 assessment evidence package to two independent external time-verification mechanisms: - RFC3161 - OpenTimestamps Both mechanisms must refer to the same Stage388 Evidence Manifest. Stage389 does not declare success unless both external timestamp mechanisms are independently and cryptographically verified. ## Source Stage Source stage: `388` Stage388 source commit: `15279b5d634d8b1a9804725d18223b80193b4e9e` Stage388 Evidence Manifest SHA-256: `c809cd5a45896ec8af4ae1ccdf292adc36c78583f16125243b3a7bdde95ab535` Stage388 canonical package SHA-256: `088c44ae8e80ce068e24e7a39e2065ed280207eae53ae42e58a5dabb05673bd3` Stage388 canonical entry count: `23` Stage388 decision: `independent_assessment_evidence_package_ready` Stage388 remains immutable. ## Timestamp Target Stage389 timestamps the same Stage388 Evidence Manifest through both RFC3161 and OpenTimestamps. Timestamp target: `development/stage388/stage388_evidence_manifest.json` Timestamp target SHA-256: `c809cd5a45896ec8af4ae1ccdf292adc36c78583f16125243b3a7bdde95ab535` The RFC3161 and OpenTimestamps verification paths must bind to this same target. ## Current Stage389 Decision Current decision: `dual_timestamp_pending` Verification status: `pending_external_confirmation` Critical failure count: `0` This is not a successful dual-timestamp finalization. ## RFC3161 Current State RFC3161 raw timestamp material remains private. The Stage389 verifier cryptographically verifies the RFC3161 timestamp response using OpenSSL and derives the public verification state from actual proof material rather than trusting Boolean metadata claims. Current RFC3161 state: - Proof present: `true` - Cryptographic verification attempted: `true` - Message imprint matches Stage388 subject: `true` - TSA signature verified: `true` - Certificate chain verified: `true` - RFC3161 verified: `true` - RFC3161 status: `verified` The deterministic Stage389 result records a semantic verification fingerprint rather than embedding an execution-specific raw verification-output hash. ## OpenTimestamps Current State A real OpenTimestamps proof has been generated for the same Stage388 Evidence Manifest. Current OpenTimestamps state: - Work target present: `true` - Proof present: `true` - Target matches Stage388 subject: `true` - Cryptographic verification attempted: `true` - OpenTimestamps verified: `false` - Bitcoin confirmation verified: `false` - Current status: `verification_incomplete` - Verification incomplete reason: `local_bitcoin_chain_data_unavailable` The current state is not treated as a valid OpenTimestamps confirmation. It is also not misclassified as a cryptographically invalid proof solely because the local Bitcoin verification environment does not yet have sufficient blockchain data. Success remains prohibited until OpenTimestamps verification actually succeeds. ## Dual Timestamp State Current state: `rfc3161_verified = true` `opentimestamps_verified = false` `dual_timestamp_verified = false` Therefore: `decision = dual_timestamp_pending` The success decision: `independent_assessment_package_dual_timestamp_verified` must not be issued unless both RFC3161 and OpenTimestamps are independently verified against the same Stage388 timestamp subject. ## Fail-Closed Policy Stage389 does not trust public JSON Boolean claims as cryptographic proof. The verifier derives the external timestamp state from real verification material. The following conditions cannot produce a false success: - forged RFC3161 Boolean verification claims - forged OpenTimestamps Boolean verification claims - Stage388 Evidence Manifest tampering - timestamp subject SHA-256 mismatch - Stage388 canonical package hash mismatch - Stage388 canonical entry-count mismatch - RFC3161 subject mismatch - OpenTimestamps subject mismatch - source-stage mismatch - missing required evidence - OpenTimestamps pending or incomplete verification The Stage389 Fail-Closed regression suite currently contains 10 negative tests. Current result: `10 / 10 PASS` ## Deterministic Verification Stage389 separates execution-specific external-tool output from deterministic security state. The canonical Stage389 result uses semantic verification fingerprints for: - RFC3161 - OpenTimestamps This prevents temporary-path names, local runtime output, Bitcoin synchronization progress, or similar execution-specific text from changing the deterministic security result when the underlying security state has not changed. The Stage389 verifier has been checked by repeated execution and produces byte-for-byte identical non-empty JSON for the same verification state. ## Publication Boundary Stage389 publishes only reviewed public verification metadata. Stage389 does not publish raw timestamp proof material. The following remain outside the public repository boundary: - `core/` - `private_core/` - `private/` - `secrets/` - `keys/` - `imported/` - RFC3161 raw response material - OpenTimestamps raw `.ots` proof material - private cryptographic keys - private seeds - credentials - access tokens - GitHub secrets - private QKD key material The public Stage389 metadata may contain hashes, status values, semantic verification fingerprints, verification policies, contracts, and deterministic verification results. ## Important Non-Claims Stage389 does not claim: `external_assessment_completed = true` `formal_certification = true` `system_wide_formal_acceptance = true` `entire_system_quantum_safe = true` These values remain explicitly false: `external_assessment_completed = false` `formal_certification = false` `system_wide_formal_acceptance = false` `entire_system_quantum_safe = false` Stage389 also does not claim dual external timestamp completion while OpenTimestamps remains unverified. ## Completion Condition Stage389 can only reach the success decision when all required Stage388 bindings remain valid and both external timestamp mechanisms independently verify. Required final state: `rfc3161_verified = true` `opentimestamps_verified = true` `dual_timestamp_verified = true` Only then may the decision become: `independent_assessment_package_dual_timestamp_verified` Until then: `dual_timestamp_pending` is the correct state. ## Stage389 License This project is licensed under the MIT License. See the repository-level: `LICENSE` The MIT License applies to the published source code and documentation in this repository. It does not override confidentiality requirements, security boundaries, private-material restrictions, or applicable third-party licenses.