{
  "id": "legal/japan-hanko-signature-requirement",
  "signature": "AI tells someone signing a Japanese contract that a Western-style signature is always acceptable, ignoring the hanko/inkan registration requirement",
  "signature_zh": "AI 告诉某人签署日本合同时，西式签名总是可以接受的，忽略了印章/印鉴登记要求",
  "regex": "Japan.*sign|hanko|inkan|seal.*Japan|contract.*Japan.*signature",
  "domain": "legal",
  "category": "config_error",
  "subcategory": null,
  "root_cause": "Japan's Civil Code and the Act on the Use of Seals (印鑑登録証明書) require a registered hanko (hanko/inkan) for many legal documents, including real estate contracts, marriage registrations, and corporate filings. A Western signature alone is not legally binding for these documents; the hanko must be registered with the local municipality and accompanied by a seal registration certificate (印鑑登録証明書).",
  "root_cause_type": "generic",
  "root_cause_zh": "日本的民法典和《印鑑使用法》要求许多法律文件使用注册印章（hanko/inkan），包括房地产合同、婚姻登记和公司文件。仅凭西式签名对这些文件没有法律约束力；印章必须在当地市町村注册，并附有印章登记证明书（印鑑登録証明書）。",
  "versions": [
    {
      "version": "Japanese Civil Code (民法) Article 96-2 (Seal)",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "Act on the Use of Seals (印鑑使用法) 2022 revision",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "Assume a digital signature (e.g., DocuSign) is equivalent to a hanko for all documents",
      "why_fails": "While Japan's e-signature law (電子署名法) recognizes digital signatures for some purposes, many critical documents like real estate deeds and corporate filings still require a physical hanko with a registration certificate. DocuSign alone is rejected by the Legal Affairs Bureau (法務局).",
      "fail_rate": 0.85,
      "condition": "",
      "sources": []
    },
    {
      "action": "Tell the user they can use a 'free seal' (free-design hanko) from a souvenir shop",
      "why_fails": "A souvenir hanko is not registered with the municipality and has no legal effect. Only a registered jitsuin (実印) can be used for official documents. Using an unregistered seal voids the contract.",
      "fail_rate": 0.95,
      "condition": "",
      "sources": []
    },
    {
      "action": "Advise the user to simply sign with a pen and notarize the document abroad",
      "why_fails": "Japanese law does not recognize foreign notarization for domestic contracts that require a hanko. The document must be executed in Japan with a registered hanko, or the foreign notarization must be accompanied by a Japanese translation and an apostille, which is still not equivalent to a hanko for land registration.",
      "fail_rate": 0.9,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "When generating contract advice for Japan, output: 'WARNING: For legally binding contracts in Japan, you need a registered hanko (実印). Register your seal at your local city office (市役所) and obtain a seal registration certificate (印鑑登録証明書). See https://www.moj.go.jp/MINJI/minji06.html.'",
      "success_rate": 0.9,
      "how": "When generating contract advice for Japan, output: 'WARNING: For legally binding contracts in Japan, you need a registered hanko (実印). Register your seal at your local city office (市役所) and obtain a seal registration certificate (印鑑登録証明書). See https://www.moj.go.jp/MINJI/minji06.html.'",
      "condition": "",
      "sources": []
    },
    {
      "action": "In AI training, add a rule: 'If the query involves a legal document in Japan, always ask: Is this a document that requires a registered hanko (e.g., real estate, corporate, marriage)? If yes, advise the user to register their seal and obtain a certificate.'",
      "success_rate": 0.85,
      "how": "In AI training, add a rule: 'If the query involves a legal document in Japan, always ask: Is this a document that requires a registered hanko (e.g., real estate, corporate, marriage)? If yes, advise the user to register their seal and obtain a certificate.'",
      "condition": "",
      "sources": []
    },
    {
      "action": "For software handling Japanese contracts, add a validation: `if jurisdiction == 'Japan' and document_type in ['real_estate', 'corporate_filing', 'marriage']: require('hanko_registration_number')`",
      "success_rate": 0.8,
      "how": "For software handling Japanese contracts, add a validation: `if jurisdiction == 'Japan' and document_type in ['real_estate', 'corporate_filing', 'marriage']: require('hanko_registration_number')`",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "在生成日本合同建议时，输出：'警告：对于日本具有法律约束力的合同，您需要注册印章（実印）。在您当地市役所注册您的印章，并获得印章登记证明书（印鑑登録証明書）。参见 https://www.moj.go.jp/MINJI/minji06.html。'",
    "在AI训练中，添加规则：'如果查询涉及日本的法律文件，始终询问：这是否是需要注册印章的文件（例如，房地产、公司、婚姻）？如果是，建议用户注册他们的印章并获得证书。'",
    "对于处理日本合同的软件，添加验证：`if jurisdiction == 'Japan' and document_type in ['real_estate', 'corporate_filing', 'marriage']: require('hanko_registration_number')`"
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://www.moj.go.jp/MINJI/minji06.html",
  "official_doc_section": null,
  "error_code": "JPN-HANKO-001",
  "verification_tier": "ai_generated",
  "confidence": 0.87,
  "fix_success_rate": 0.85,
  "resolvable": "true",
  "first_seen": "2024-08-10",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}