{ "format": "agent-article-v0", "article_id": "EA-103", "canonical_url": "/tools/ea-103-provenance-c2pa", "page_type": "reference", "claim_ids": [], "evidence_ids": [ "EVD-EA-103-URL-E0FFA9F133CE", "EVD-EA-103-URL-1AA47DA26DDD", "EA-103-R11-RESEARCH", "EA-103-R11-WEB-READBACK" ], "unknown_ids": [ "EA-103-UNKNOWN-01", "EA-103-UNKNOWN-CURRENTNESS" ], "operational_object_ids": [], "provider": [], "models": [], "plans": [], "surfaces": [], "regions": [], "current_status": "UNKNOWN", "observation_status": "SPEC_ONLY", "freshness": "UNKNOWN", "last_verified": null, "supersedes": [], "superseded_by": [], "provenance": [ "COMM-039-EA0103", "SRC-EA-103-URL-E0FFA9F133CE", "SRC-EA-103-URL-1AA47DA26DDD", "WEBBODY-EA0103-R8-52BA41A7" ], "article_sources": [ { "id": "EVD-EA-103-URL-E0FFA9F133CE", "evidence_class": "RESEARCH", "title": "1) source class: technical specification; exact title: Content Credentials: C2PA Technical Specification; author/org: Coalition for Content Provenance and Authenticity; canonical U", "href": "https://spec.c2pa.org/specifications/specifications/2.4/specs/C2PA_Specification.html", "supports": [], "limit": "元の監査済み資料に記載された参照先です。URLの復元は、資料の最新性や全主張の支持を新たに検証したことを意味しません。", "origin_class": "SOURCE_PACKET_REFERENCE", "source_or_experiment_ids": [ "SRC-EA-103-URL-E0FFA9F133CE" ], "supporting_locators": [ "EVIDENCE TABLE", "1) source class: technical specification; exact title: Content Credentials: C2PA Technical Specification; author/org: Coalition for Content Provenance and Authenticity; canonical URL: https://spec.c2pa.org/specifications/specifications/2.4/specs/C2PA_Specification.html" ], "scope": "EVIDENCE TABLE", "provenance_status": "SOURCE_PACKET_REFERENCE_PROJECTED" }, { "id": "EVD-EA-103-URL-1AA47DA26DDD", "evidence_class": "RESEARCH", "title": "2) source class: technical specification index; exact title: C2PA Specifications; author/org: C2PA; canonical URL:", "href": "https://spec.c2pa.org/specifications/specifications/2.4/index.html", "supports": [], "limit": "元の監査済み資料に記載された参照先です。URLの復元は、資料の最新性や全主張の支持を新たに検証したことを意味しません。", "origin_class": "SOURCE_PACKET_REFERENCE", "source_or_experiment_ids": [ "SRC-EA-103-URL-1AA47DA26DDD" ], "supporting_locators": [ "EVIDENCE TABLE", "2) source class: technical specification index; exact title: C2PA Specifications; author/org: C2PA; canonical URL: https://spec.c2pa.org/specifications/specifications/2.4/index.html" ], "scope": "EVIDENCE TABLE", "provenance_status": "SOURCE_PACKET_REFERENCE_PROJECTED" }, { "id": "EA-103-R11-RESEARCH", "evidence_class": "RESEARCH", "title": "EA-103 監査済みresearch / canonical revision binding", "supports": [ "C2PA 2.4はassertionをclaimへまとめ、署名付きmanifestとしてassetへ結び、signer identity・timestamp・validationを扱う技術仕様である。従って「誰が何を主張したか」「manifestが改変されていないか」の証拠層にはなるが、署名者の善意、入力データの真実、モデルの品質、AI使用の完全検出を保証しない。" ], "limit": "canonical監査・revision bindingの存在を示す。外部ソースcurrentnessが本文またはcontrol-planeで確定していない場合は、currentnessをUNKNOWNのまま保持する。", "origin_class": "AUDITED_CANONICAL_RESEARCH_PACKET", "source_or_experiment_ids": [ "COMM-039-EA0103" ], "supporting_locators": [ "COMM-039-EA0103", "EA-103-R5-LEGACY-MIGRATION-20261008-R1", "content/staging/EA-103.md" ], "scope": "監査済みEA本文・canonical revision・既存Source Graph relationの範囲。欠損currentnessは推測で閉じない。", "provenance_status": "AUDIT_PASS_CANONICAL_BINDING" }, { "id": "EA-103-R11-WEB-READBACK", "evidence_class": "IMPL", "title": "EA-103 Web body identity / canonical readback", "supports": [ "canonical staging bodyのSHA-256一致とR9 canonical ledger readbackをProduction projectionの入力として検証する。" ], "limit": "body identity/readbackは本文claim自体の真偽や外部ソースの最新性を追加保証しない。", "checked_at": null, "origin_class": "IMPLEMENTATION_READBACK", "source_or_experiment_ids": [ "WEBBODY-EA0103-R8-52BA41A7" ], "supporting_locators": [ "WEBBODY-EA0103-R8-52BA41A7", "content/staging/EA-103.md", "EA-103-R5-LEGACY-MIGRATION-20261008-R1" ], "scope": "R9/R10 canonical readback後のProduction生成時body identity。", "provenance_status": "CANONICAL_READBACK_BODY_HASH_MATCH" } ], "research_sections": [ { "heading": "WHY_THIS_MATTERS_TO_UPDATE", "text": "AI生成物の出所・編集履歴・使用モデルを後から説明するには、本文の自己申告だけでなく、改ざん検知可能な来歴と信頼主体を分離して保存する必要がある。" }, { "heading": "SCOPE_ROUTING", "text": "Enterprise AI Core / provenance / interoperability / audit / non-LLM component" }, { "heading": "CLAIM_OR_RESEARCH_QUESTION", "text": "C2PA 2.4は、生成物の来歴・編集・署名・検証をどこまで表現し、真正性や内容の正しさまで保証するか。" }, { "heading": "EVIDENCE TABLE", "text": "1) source class: technical specification; exact title: Content Credentials: C2PA Technical Specification; author/org: Coalition for Content Provenance and Authenticity; canonical URL: https://spec.c2pa.org/specifications/specifications/2.4/specs/C2PA_Specification.html; publication/update/access: specification 2.4 / accessed 2026-09-13; version/release: C2PA Specifications 2.4; supporting locator: lines 165-188（provenance、assertions、claims、signed manifest）、193-202（signer identity、validation）、209-218（privacy/security/interoperability goals）; evidence label: VERIFIED_SPEC + PRODUCT_VOLATILE; relation: support / limit。\n2) source class: technical specification index; exact title: C2PA Specifications; author/org: C2PA; canonical URL: https://spec.c2pa.org/specifications/specifications/2.4/index.html; publication/update/access: accessed 2026-09-13; version/release: 2.4; supporting locator: lines 24-44（Content Credentials、JSON、attestations、guidance、security considerations）; evidence label: VERIFIED_SPEC; relation: context。" }, { "heading": "FINDINGS", "text": "C2PA 2.4はassertionをclaimへまとめ、署名付きmanifestとしてassetへ結び、signer identity・timestamp・validationを扱う技術仕様である。従って「誰が何を主張したか」「manifestが改変されていないか」の証拠層にはなるが、署名者の善意、入力データの真実、モデルの品質、AI使用の完全検出を保証しない。" }, { "heading": "LIMITS / COUNTEREVIDENCE / FAILURE ENVELOPE", "text": "仕様自身が、assertionの妥当性・関連付け・改ざんの検証を扱うのであって、provenanceデータがgood/badという価値判断をしないと明記する。opt-inであり、メタデータ欠落や変換経路も残る。" }, { "heading": "AVAILABILITY_GATES", "text": "signer identity/trust list・certificate revocation・manifest preservation・asset format・redaction/privacy・validator implementation・version 2.4 compatibility。" }, { "heading": "IMPLEMENTATION_STATE", "text": "実装状態: C2PA manifestを出力工程と編集工程へ付与する設計候補。実ファイルへの署名・検証は未実施。" }, { "heading": "BENCHMARK_OR_EVAL", "text": "Evaluation: 同一assetにcreate/edit/export/format-conversionを行う安全なfixtureを作り、manifest保持、署名検証、redaction、検証失敗を確認する。Benchmarkのスコア外挿はしない。" }, { "heading": "SECURITY / PRIVACY / AUDIT / COST / OPERABILITY", "text": "SECURITY/PRIVACY/AUDIT: signer key管理、個人情報を含むassertionのredaction、検証結果とasset hashの保存。COST: key infrastructure・validator integrationは未計測。OPERABILITY: 仕様versionと検証結果をasset単位で保存。" }, { "heading": "SAFE_WORDING_FOR_FUTURE_BOOK", "text": "「C2PA 2.4は署名付きmanifest、assertion、signer identity、validationを定義し、改ざん検知可能な来歴を表現する。来歴の存在は、内容の真実・安全性・AI利用の完全な証明ではない。」" }, { "heading": "UPDATE_WORK_HANDOFF", "text": "本文改訂時はprovenanceを、assertion/署名/検証結果/信頼主体/欠落/プライバシーの別列で記載する。" }, { "heading": "OPEN_UNKNOWN", "text": "主要生成モデル・文書/音声/動画形式の実装coverage、trust list運用、鍵失効後の表示、manifest欠落時の組織ポリシー。" }, { "heading": "STOP_CONDITION", "text": "署名検証とsigner trustを分けずに「真正」と表現しない。\nUNIT_CLOSE_STATUS: INDIVIDUAL_BOUNDED_CLOSE / EVIDENCE_RECORDED / UNKNOWN_PRESERVED\n\n---" }, { "heading": "AUDITED_CURRENTNESS_BOUNDARY", "text": "C2PA 2.4 remains current official provenance spec; provenance validity is distinct from truth, safety and completeness of AI-use detection." } ], "human_url": "/tools/ea-103-provenance-c2pa", "markdown_url": "/agent/article.md?path=%2Ftools%2Fea-103-provenance-c2pa", "json_url": "/agent/article.json?path=%2Ftools%2Fea-103-provenance-c2pa" }