BigQuery digest extracts (deps.dev, Rekor)
How the depsdev and rekor filters were produced, 2026-08-01.
Everything runs in the free tier: a billing-free sandbox project
(queries cannot be charged; 1 TB/month processing, 10 GB storage cap),
and tabledata.list paging for download, which is free and doesn't
count as query processing.
gcloud projects create hashdex-sandbox # NO billing account attached
gcloud config set project hashdex-sandbox
bq mk --location=US -d hashdex_extracts
deps.dev: 344.9M artifact digests (47 GB scan)
PackageVersionHashes is 9.2 TiB across daily snapshot partitions —
always filter to one partition with a literal timestamp (the
*Latest views don't prune). Find the newest:
SELECT partition_id, total_rows
FROM `bigquery-public-data.deps_dev_v1.INFORMATION_SCHEMA.PARTITIONS`
WHERE table_name = 'PackageVersionHashes' AND partition_id != '__NULL__'
ORDER BY partition_id DESC LIMIT 3
Extract (store BYTES, not base64 strings — a Hash+HashType string table blew the sandbox's 10 GB storage cap; raw bytes squeak under at 8.99 GiB, and scheme is recoverable from digest length):
SELECT DISTINCT FROM_BASE64(`Hash`) AS h
FROM `bigquery-public-data.deps_dev_v1.PackageVersionHashes`
WHERE TIMESTAMP_TRUNC(SnapshotAt, DAY) = TIMESTAMP('2026-07-20')
AND HashType IN ('SHA1','SHA256')
→ destination table hashdex_extracts.depsdev_hashes. Gotchas:
Hash needs backticks (reserved word); values are base64; dry-run
first (bq query --dry_run) — the free tier is a hard monthly budget.
Rekor: 8.2M attestation-subject digests (3.2 GB scan)
rekor.Artifacts.Digest is ARRAY<STRING> of sha256:<hex> (some
empty):
SELECT DISTINCT REGEXP_EXTRACT(d, r'^sha256:([0-9a-fA-F]{64})$') AS digest
FROM `bigquery-public-data.rekor.Artifacts`, UNNEST(Digest) AS d
WHERE REGEXP_CONTAINS(d, r'^sha256:[0-9a-fA-F]{64}$')
→ hashdex_extracts.rekor_digests. Note this is attestation
subjects only (39M rows). The full rekor.IndexKeys (8.4B rows,
every hashedrekord digest — where goreleaser release binaries live)
costs ~636 GB of quota to distinct-scan and produces a result too big
for sandbox storage; deferred until a billed GCS staging path or a
patient paging session is worth it.
Download + build
tools/bq_download.py all # parallel tabledata.list paging (free),
# ~160k rows/s with 24 workers; writes hex
# lines split per scheme into
# ~/.cache/hashdex/extracts/
hdx filters build depsdev sha1 ~/.cache/hashdex/extracts/depsdev.sha1.*.hex
hdx filters build depsdev sha256 ~/.cache/hashdex/extracts/depsdev.sha256.*.hex
hdx filters build rekor sha256 ~/.cache/hashdex/extracts/rekor.sha256.*.hex
Key convention (must match hdx scan): sha1 keys UPPERCASE hex,
sha256 lowercase — filters build normalizes.