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  "generated_by": "tools/orderbook_ab/merge_ab.py",
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      "columns": [
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      "columns": [
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      "columns": [
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        "sequence",
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        "asset_id",
        "old_tick_size",
        "new_tick_size",
        "witness_set",
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  },
  "row_count": 91534312,
  "sequence_note": "sequence and timestamp_received are collector-local provenance; where domains carry the same row, the merge keeps the LAST ACTIVE domain's values -- for this hour, domain e (active: b, c, h, e)",
  "sha256": "3f9d345d9a3c95fad8e6f6a44be5508d55ca73281648b296a65dd4c248a5938b",
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    "reason": "witnesses_added",
    "row_count_before": 91534312,
    "witnesses_before": "che"
  },
  "verification": {
    "note": "A range digest certifies BYTES. That those bytes are that product comes from this manifest and is cross-checkable against the Parquet footer, which is inside the whole-file sha256.",
    "primary": "sha256sum <file> == .sha256",
    "secondary": "curl -r <start>-<end-1> <url> | sha256sum == .products.<name>.sha256"
  },
  "witness_stats": "2026-08-31T17.witness_stats.json",
  "witnesses": "bche",
  "served_verbatim": true,
  "served_note": "This hour is the merger's union file, published byte for byte. Hours before the era cutover are rebuilt here from the seven product files and carry one column fewer."
}