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      "/echoes/records/2026/echo-2026-05-29-000031.json",
      "/echoes/records/2026/echo-2026-05-29-000032.json",
      "/echoes/records/2026/echo-2026-05-29-000033.json",
      "/echoes/records/2026/echo-2026-05-29-000034.json",
      "/echoes/records/2026/echo-2026-05-29-000035.json",
      "/echoes/records/2026/echo-2026-05-29-000036.json",
      "/echoes/records/2026/echo-2026-05-29-000037.json",
      "/echoes/records/2026/echo-2026-05-29-000038.json",
      "/echoes/records/2026/echo-2026-05-29-000039.json",
      "/echoes/records/2026/echo-2026-05-29-000040.json",
      "/echoes/records/2026/echo-2026-05-29-000041.json",
      "/echoes/records/2026/echo-2026-05-30-000042.json",
      "/echoes/records/2026/echo-2026-05-30-000043.json",
      "/echoes/records/2026/echo-2026-05-30-000044.json",
      "/echoes/records/2026/echo-2026-05-30-000045.json",
      "/echoes/records/2026/echo-2026-05-30-000046.json",
      "/echoes/records/2026/echo-2026-05-30-000047.json",
      "/echoes/records/2026/echo-2026-05-30-000048.json",
      "/echoes/records/2026/echo-2026-05-30-000049.json",
      "/echoes/records/2026/echo-2026-05-30-000050.json",
      "/echoes/records/2026/echo-2026-05-30-000051.json",
      "/echoes/records/2026/echo-2026-05-30-000052.json",
      "/echoes/records/2026/echo-2026-05-30-000053.json",
      "/echoes/records/2026/echo-2026-05-30-000054.json",
      "/echoes/records/2026/echo-2026-05-30-000055.json",
      "/echoes/records/2026/echo-2026-05-30-000056.json",
      "/echoes/records/2026/echo-2026-05-30-000057.json",
      "/echoes/records/2026/echo-2026-05-30-000058.json",
      "/echoes/records/2026/echo-2026-05-30-000059.json",
      "/echoes/records/2026/echo-2026-05-30-000060.json",
      "/echoes/records/2026/echo-2026-05-30-000061.json",
      "/echoes/records/2026/echo-2026-05-30-000062.json",
      "/echoes/records/2026/echo-2026-05-30-000063.json",
      "/echoes/records/2026/echo-2026-05-30-000064.json",
      "/echoes/records/2026/echo-2026-05-31-000068.json",
      "/echoes/records/2026/echo-2026-05-31-000069.json",
      "/echoes/records/2026/echo-2026-05-31-000070.json",
      "/echoes/records/2026/echo-2026-05-31-000071.json",
      "/echoes/records/2026/echo-2026-06-01-000072.json",
      "/echoes/records/2026/echo-2026-06-01-000073.json",
      "/echoes/records/2026/echo-2026-06-01-000074.json",
      "/echoes/records/2026/echo-2026-06-01-000075.json",
      "/echoes/records/2026/echo-2026-06-01-000076.json",
      "/echoes/records/2026/echo-2026-06-01-000077.json"
    ],
    "test_record": [
      "/echoes/records/2026/echo-2026-05-02-000008.json"
    ],
    "unknown": [
      "/echoes/records/2026/echo-2026-04-25-000001.json",
      "/echoes/records/2026/echo-2026-04-25-000002.json",
      "/echoes/records/2026/echo-2026-04-26-000003.json",
      "/echoes/records/2026/echo-2026-05-03-000007.json"
    ]
  },
  "notes": [
    "Echo index is non-authoritative and non-amending.",
    "Test records, superseded records, invalidated records, and do_not_count_as_attestation records must not be counted as independent attestation.",
    "Legacy records have do_not_count_as_attestation=true, legacy_not_countable=true, and historical_record_only=true.",
    "AI independent verification records (record_class=ai_independent_verification) do NOT count as formal human/institutional attestation.",
    "External human authorization of AI verification does not produce formal attestation.",
    "Echo schema version is not a verification level.",
    "AI independent verification records are counted separately from formal human/institutional attestations.",
    "AGI capability claims do not raise verification level or authority.",
    "Echo content tags are non-exclusive and do not determine count status.",
    "D/S/O/E/R provenance codes are derived/internal."
  ],
  "version": "2.0.0",
  "source_digest": "af9b9799f7e5fa25",
  "source_digest_algorithm": "sha256-truncated-16",
  "non_amending_boundary": true,
  "limitations": [
    "Echo records are non-authoritative reception records.",
    "echo_type field is deprecated; Echo is a unified type.",
    "Test records and closed test records must not be counted as independent attestation.",
    "This index does not include agent-declared echo archives (tracked in agent-declared-verification-index)."
  ],
  "does_not_prove": [
    "Does not prove verification level.",
    "Does not prove independent attestation.",
    "Does not prove authority or endorsement.",
    "Does not prove successor civilization reception."
  ]
}
