プロベナンス検証

// 1. Seller publishes — returned by get_products on each Product
{
  "creative_policy": {
    "accepted_verifiers": [
      {
        "agent_url": "https://governance.encypher.seller.example",
        "feature_id": "encypher.markers_present_v2",
        "providers": ["Encypher"]
      },
      {
        "agent_url": "https://governance.imatag.seller.example",
        "feature_id": "imatag.watermark_detected",
        "providers": ["Imatag"]
      }
    ]
  }
}

// 2. Buyer represents — attached to creative on sync_creatives
{
  "embedded_provenance": [
    {
      "method": "provenance_markers",
      "provider": "Encypher",
      "verify_agent": {
        "agent_url": "https://governance.encypher.seller.example",
        "feature_id": "encypher.markers_present_v2"
      }
    }
  ]
}

// 3. Seller confirms — cross-check, then call, then reconcile.
//    Off-list URL → PROVENANCE_VERIFIER_NOT_ACCEPTED, no outbound call.
//    On-list URL with contradicting verifier result → PROVENANCE_CLAIM_CONTRADICTED.

{
  "audit_observations": [
    {
      "code": "OVERSIGHT_DISCLOSURE_CARVEOUT_CLAIMED",
      "severity": "audit-worthy",
      "recovery": "informational",
      "field": "creative_manifest.provenance.disclosure.required",
      "message": "Creative claims human-directed AI output does not require disclosure; retain for audit review.",
      "details": {
        "agent_url": "https://governance.encypher.seller.example",
        "feature_id": "ai_generated",
        "claimed_value": {
          "human_oversight": "directed",
          "disclosure_required": false
        },
        "observed_value": true,
        "confidence": 0.94
      }
    }
  ]
}

{
  "governance": {
    "creative_features": [
      {
        "feature_id": "ai_generated",
        "type": "binary",
        "description": "Whether the creative contains AI-generated content",
        "methodology_url": "https://detector.example.com/methodology"
      },
      {
        "feature_id": "ai_modified",
        "type": "binary",
        "description": "Whether the creative contains AI-modified elements",
        "methodology_url": "https://detector.example.com/methodology"
      },
      {
        "feature_id": "ai_confidence",
        "type": "quantitative",
        "range": { "min": 0, "max": 1 },
        "description": "Confidence score for AI detection result",
        "methodology_url": "https://detector.example.com/methodology"
      }
    ]
  }
}

{
  "creative_manifest": {
    "format_id": {
      "agent_url": "https://creative.adcontextprotocol.org",
      "id": "display_300x250"
    },
    "assets": {
      "banner_image": {
        "url": "https://cdn.novabrands.example.com/hero.jpg",
        "width": 300,
        "height": 250
      },
      "headline": {
        "content": "Nutrition dogs love"
      }
    }
  },
  "feature_ids": ["ai_generated", "ai_modified", "ai_confidence"]
}

{
  "results": [
    { "feature_id": "ai_generated", "value": true, "confidence": 0.94 },
    { "feature_id": "ai_modified", "value": false },
    { "feature_id": "ai_confidence", "value": 0.94 }
  ],
  "detail_url": "https://detector.example.com/reports/ctx_xyz789"
}

const provenance = creative.manifest.provenance;
const detection = await detectionAgent.getCreativeFeatures({
  creative_manifest: creative.manifest,
  feature_ids: ['ai_generated']
});

if (detection.errors) {
  // Detection failed - handle based on policy
  return;
}

const aiDetected = detection.results.find(
  f => f.feature_id === 'ai_generated'
);

// Case 1: Provenance claims non-AI, detection says AI
if (
  provenance?.digital_source_type === 'digital_capture' &&
  aiDetected?.value === true &&
  aiDetected?.confidence > 0.9
) {
  // Reject - provenance claim contradicts detection
  return;
}

// Case 2: AI content in jurisdiction requiring disclosure
if (
  aiDetected?.value === true &&
  !provenance?.disclosure?.required
) {
  // Reject - AI content without required disclosure metadata
  return;
}

{
  "property_id": { "type": "domain", "value": "newssite.example.com" },
  "artifact_id": "article_trends_2026",
  "provenance": {
    "digital_source_type": "digital_creation",
    "declared_by": { "role": "platform" }
  },
  "assets": [
    {
      "type": "text",
      "role": "title",
      "content": "Industry trends to watch in 2026"
    },
    {
      "type": "image",
      "url": "https://cdn.newssite.example.com/ai-illustration.jpg",
      "alt_text": "Conceptual illustration",
      "provenance": {
        "digital_source_type": "trained_algorithmic_media",
        "ai_tool": { "name": "Midjourney", "version": "v7" },
        "declared_by": { "role": "platform" }
      }
    }
  ]
}

{
  "verdict": "fail",
  "explanation": "The article's hero image shows strong indicators of AI generation (GAN artifacts, inconsistent lighting) but is marked as digital_creation. The provenance claim does not match detection results.",
  "features": [
    {
      "feature_id": "provenance_accuracy",
      "status": "failed",
      "explanation": "Image asset provenance claims digital_creation but AI detection confidence is 0.92."
    },
    {
      "feature_id": "brand_safety",
      "status": "passed",
      "explanation": "No safety concerns with the content itself."
    }
  ]
}

{
  "standards_id": "acme_ai_disclosure_policy",
  "records": [
    {
      "record_id": "imp_54321",
      "media_buy_id": "mb_acme_q1",
      "artifact": {
        "property_id": { "type": "domain", "value": "newssite.example.com" },
        "artifact_id": "article_trends_2026",
        "provenance": {
          "digital_source_type": "digital_creation",
          "declared_by": { "role": "platform" }
        },
        "assets": [
          {
            "type": "image",
            "url": "https://cdn.newssite.example.com/ai-illustration.jpg"
          }
        ]
      }
    }
  ]
}