Hour audit: 2026-08-19T04
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.
No findings
Every check that could be evaluated for this hour passed. That is not the same as the hour being perfect: it means the records this archive keeps about it agree with each other and with the corpus ledger.
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 2026-08-19T04 · corpus v3 · verdict AUDIT PASS
COVERAGE minutes present 60/60 · first event 2026-08-19T04:00:00.004256+00:00 · last event 2026-08-19T04:59:59.139332+00:00
VOLUME 8,385,686 rows · 129,047,162 bytes (123.07 MiB) · 7 products, all holding rows
WITNESSES not measured (this hour carries no per-machine row accounting)
INTEGRITY sha256 fc134180b9781f12441fb67e61ac1cfd6fd68b86be04b5be97a57a441e9c9d4f
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 5/8 pass, 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
PASS the hour is whole
SKIPPED whether a boundary guard ran is not recorded
UPSTREAM an incident recorded by the venue intersects this hour: Venue infrastructure maintenance, 2026-08-19T04:00Z to 2026-08-19T05:30ZThe 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 653,386 10,986,186 0-2 02fc847815834bf760052df8a6e1c1bcf79cbdb52227a926c67d1c0e31a231b4 book 871,444 48,191,745 3-6 fcc94724b03ad4e5709a3cbf7b219f7be3b6699fd3601813bc37266a36408da5 last_trade_price 8,908 528,711 7-7 1c09e9ce54613a216c66f1e8d8c2165906aa0eff896a0cb78b69abbf2e484dfa market_resolved 884 133,981 8-8 9a99879c76774f69b069e9a33bc52dfa9b1e601946d048d123ce5309d5ca94af new_market 1,720 199,744 9-9 fb02c4cebe526e50b0bab0ac44d2d577559ca22335712618955b41357e7b1809 price_change 6,848,852 68,888,727 10-36 7fee2de0603c5141710d7406b31b804de124f108b9132edcd5ece16c4eb3ce75 tick_size_change 492 17,282 37-37 28d5b24869137c3c8ce2f6e65a41119983d4a043b1428a22d01208f08b6e8475 EVENT MIX count share price_change 6,848,852 81.67% book 871,444 10.39% best_bid_ask 653,386 7.79% last_trade_price 8,908 0.11% new_market 1,720 0.02% market_resolved 884 0.01% tick_size_change 492 <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/v3/2026-08-19/04/2026-08-19T04.parquet sha256sum 2026-08-19T04.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.