Hour audit: 2026-08-20T18

back to the files for this hour · how the archive is audited

Every number on this page is a stored measurement read from this hour's own records: its manifest.json, its witness statistics sidecar, and the corpus attestation. Nothing here is computed from the served bytes at the time you load the page, so no line below claims the bytes are correct. The digest and the one command that checks them are printed instead.

1 finding

• the hour is short of its sixty minutes. 58 of the 60 minutes carry events; 2 do not.

3 checks could not be evaluated for this hour, listed with the reason in the block below. A check we could not run is recorded as exactly that, and never counted as a pass.

The report

POLYMARKET ORDERBOOK ARCHIVE — HOUR AUDIT
hour 2026-08-20T18 · corpus v3 · verdict AUDIT PARTIAL (1 finding)

COVERAGE    minutes present 58/60 · first event 2026-08-20T18:00:00.005393+00:00 · last event 2026-08-20T18:59:54.611411+00:00
VOLUME      85,401,364 rows · 805,895,093 bytes (768.56 MiB) · 7 products, all holding rows
WITNESSES   not measured (this hour carries no per-machine row accounting)
INTEGRITY   sha256 e9db053f0310f4c5bdddc018537ad5d64362755e45f686573ad1a8e276535574
            the corpus checksum ledger names this file with the same digest
SIDECARS    none: this hour's manifest has no v31 key. The v3.1 sidecars are optional, and hours before them have none
MARKETS     not measured (the per-hour market census runs on the capture host and its output is not published per hour)
HISTORY     layout union-event-sorted-v1
            re-merges not measured (the merge ledger records the merge that produced this file, not the history of attempts)
            supersessions not measured (supersession is recorded per corpus in the storage registry, not in the hour manifest)
CHECKS      4/8 pass, 1 finding, 3 not evaluated
              PASS    all products present
              PASS    row counts reconcile
              PASS    byte ranges tile the file
              SKIPPED the merge delta could not be checked
              SKIPPED which machines were expected is not published beside this hour
              PASS    the checksum ledger names this file
              FINDING the hour is short of its sixty minutes
              SKIPPED whether a boundary guard ran is not recorded
UPSTREAM    our incident register was checked against the venue's own status feed at 2026-09-23T20:35Z and names no event in this hour. That is a statement about what they published, not a check that every message they sent reached us.

The words in this report

Each line in the CHECKS block states what was found, not what was hoped for: a check that passes is named for the thing that is true, and a check that does not is renamed to the thing that is wrong. So FINDING never sits beside a sentence asserting the opposite of the one below it.

The report above is fixed-width text, so nothing in it can be clicked. The same terms are linked here instead. Its verdict is a statement about minutes and nothing else. The row it reports comes from this hour's own manifest and its witness-statistics sidecar, and the completeness line comes from the corpus attestation. The gap between the joined and merged counts is deduplication, not loss, and the boundary drops are the duplicates discarded at the seam with the hour before. Where the history line names a supersession, this hour was rebuilt to a better state after it was first published. The precision is the timestamp resolution these files carry.

Detail

The same records, per product. A product holding no rows renders its zero rather than being dropped: dropped and empty are indistinguishable to a reader, and only one of them is a defect. A cell reading not meas. is one nothing published, which is a third thing again and never a zero.

The class column is the merger's own verdict for that product, and it is keyed to CONTRIBUTION rather than presence. FULL means every machine expected to be capturing this hour delivered rows for that product; PARTIAL means some did and some did not; SINGLE-BY-DESIGN means only one machine was ever expected, and SINGLE-BY-DEFECT means several were and one delivered. So PARTIAL here is a statement about the fleet, not about the product being damaged or truncated: the rows that are present are whole.

PRODUCT                     rows          bytes   row groups  sha256
best_bid_ask           6,352,491     63,690,337         0-24  eae6cffafe00b17536f347dc6123c76acb18c95a29572ff6df89de314e0d4726
book                   2,966,668    107,479,434        25-36  0ca7a3ec9719ec73856f98b026ba83e5aab809a05337bce012451e305f45a8db
last_trade_price          61,364      3,292,640        37-37  381894ad49fce69eed719bb49def0461d8a8f48611fa46e22d43429feeeac36c
market_resolved            1,692        133,826        38-38  f2c9a36ddb72cdc3b0a2a399bf86ba4ca386ef20d3ca0deeb6a4999f208b9277
new_market                 2,639        202,809        39-39  2c0cbe8d9629b920becddd2e6392dff7b107591c486f015212be1424037ccde2
price_change          76,012,930    630,107,055       40-329  79ce4b3bc4bde53f4d93725a2597848540c9da8034f9cd65c7302669e07afbd0
tick_size_change           3,580        121,579      330-330  96fc3a5efd35313647e03414e19d82a3d3dff94d83c9e9b1e9bedd93499f6b86

EVENT MIX                  count    share
price_change          76,012,930   89.01%
best_bid_ask           6,352,491    7.44%
book                   2,966,668    3.47%
last_trade_price          61,364    0.07%
tick_size_change           3,580   <0.01%
new_market                 2,639   <0.01%
market_resolved            1,692   <0.01%

Captured and supplied are different numbers

Captured is how many rows each machine's own feed carried. Redundant capture means these OVERLAP, heavily and on purpose, so they do not partition the file and their sum is larger than it. Two machines each capturing nearly every event is the archive working, not double counting.

Supplied is how many rows of the merged file actually came from that machine. This one does partition: it sums to the file's row count exactly. But it is decided by the merge's tie-break, so a machine can capture almost everything and supply almost nothing. Read alone, either number tells a false story about the fleet, which is why both are printed and neither is called "the witness share".

What the skew columns mean

Arrival skew is the receipt timestamp minus the venue timestamp, in milliseconds. For six of the seven products the sidecar interprets it as transport latency, and marks that interpretation assumed: it rests on the venue timestamp being emit time, which we cannot verify from outside.

book is not latency and must not be read as latency. Its venue timestamp is the last time the book changed, so the sidecar interprets it as book staleness and warns in its own note that large values mean a quiet book rather than slow transport. Its maximum runs to weeks for that reason. This is why the table above gives a row per product per machine and never one figure for the hour: percentiles do not average, and these seven do not measure the same quantity.

Check it yourself

The digest above is a claim. This is how you refuse to take our word for it:

curl -O https://archive.pendulumflow.com/v3/2026-08-20/18/2026-08-20T18.parquet
sha256sum 2026-08-20T18.parquet
# compare with the sha256 line in the report above

A range digest certifies bytes. That those bytes are the product the manifest names comes from the manifest, which is why both are published and both are checkable.