{
  "$schema": "https://themachinepress.com/schemas/story-v1.schema.json",
  "schema_version": "1.0.0",
  "document_type": "machine_press_story",
  "story": {
    "story_id": "mp-2026-10-23-012",
    "source_story_id": "tmp-story-opprint-distillation-membership",
    "edition_id": "mp-2026-10-23-morning-0105",
    "edition_url": "https://themachinepress.com/edition/2026-10-23",
    "position": 12,
    "story_type": "dispatch",
    "section": "safety-security",
    "editorial_classification": "editorial",
    "headline": "Self-Distillation Leaves a Sparse Membership Print",
    "slug": "self-distillation-leaves-a-sparse-membership-print",
    "dek": "OP-Print targets uncertainty-sensitive correction sites rather than averaging a privacy signal across the whole generated rollout.",
    "summary": "OP-Print targets uncertainty-sensitive correction sites rather than averaging a privacy signal across the whole generated rollout.",
    "body_text": "On-policy self-distillation uses a model's enhanced output to supervise another view of the same example, avoiding an external teacher but potentially coupling memorization signals. OP-Print finds that the teacher-student correction imprint is concentrated at a small set of uncertainty-sensitive tokens. Its gray-box attack aggregates those residual corrections; its black-box version measures how stable restarted outputs remain around the same basin. In the reported experiments, standard attacks stayed near random guessing even with gray-box access, while OP-Print was effective across multiple models and distillation schemes. The work demonstrates a privacy risk under its access assumptions, not a measured leak in every self-distilled model.",
    "why_it_matters": "OP-Print targets uncertainty-sensitive correction sites rather than averaging a privacy signal across the whole generated rollout.",
    "limitations": [
      "Its gray-box attack aggregates those residual corrections; its black-box version measures how stable restarted outputs remain around the same basin.",
      "The work demonstrates a privacy risk under its access assumptions, not a measured leak in every self-distilled model."
    ],
    "importance": 8,
    "canonical_url": "https://themachinepress.com/story/mp-2026-10-23-012/self-distillation-leaves-a-sparse-membership-print",
    "json_url": "https://themachinepress.com/story/mp-2026-10-23-012.json",
    "first_published_at": "2026-10-23T09:00:00.000-04:00",
    "modified_at": "2026-10-23T09:00:00.000-04:00",
    "content_status": "new",
    "is_carryover": false,
    "carryover_reason": null,
    "key_claims": [
      {
        "claim_id": "claim-mp-2026-10-23-012-001",
        "text": "OP-Print targets uncertainty-sensitive correction sites rather than averaging a privacy signal across the whole generated rollout.",
        "source_ids": [
          "source-2026-10-23-012"
        ],
        "qualification": "Its gray-box attack aggregates those residual corrections; its black-box version measures how stable restarted outputs remain around the same basin."
      }
    ],
    "source_ids": [
      "source-2026-10-23-012"
    ],
    "tags": [
      "privacy",
      "distillation",
      "membership inference"
    ],
    "image_url": null,
    "corrections": []
  },
  "sources": [
    {
      "source_id": "source-2026-10-23-012",
      "title": "arXiv preprint 2610.31616, original v1",
      "publisher": "arXiv",
      "url": "https://arxiv.org/abs/2610.31616v1",
      "canonical_url": "https://arxiv.org/abs/2610.31616v1",
      "source_type": "primary_research",
      "is_primary_source": true,
      "published_at": "2026-10-22T13:41:04.000-04:00",
      "accessed_at": "2026-10-23T08:21:38.024-04:00",
      "supports_claim_ids": [
        "claim-mp-2026-10-23-012-001"
      ]
    }
  ],
  "corrections": [],
  "publisher": {
    "name": "The Machine Press",
    "url": "https://themachinepress.com",
    "description": "A daily newspaper for the age of artificial intelligence."
  },
  "cite_this_report": {
    "title": "Self-Distillation Leaves a Sparse Membership Print",
    "publisher": "The Machine Press",
    "published_at": "2026-10-23T09:00:00.000-04:00",
    "canonical_url": "https://themachinepress.com/story/mp-2026-10-23-012/self-distillation-leaves-a-sparse-membership-print"
  }
}