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Sigstore Rekor subject-digest bloom filter
Membership filter over sha256 subject digests recorded in the Sigstore Rekor transparency log (public dataset extract, 2026-08-01) — artifacts that have been signed/attested via Sigstore.
- 8,202,977 sha256 keys (lowercase hex), p = 1e-4, 19 MiB
- A hit means "something signed an artifact with this digest"; resolve against the live Rekor API for the actual log entry
Rebuild
See EXTRACT.md (BigQuery free-tier queries) + bq_download.py +
./dcso_bloom_build.py rekor.sha256.bloom sha256 *.hex.
Format
DCSO bloom filter format (github.com/DCSO/bloom), the same format
CIRCL publishes hashlookup in: 48-byte little-endian u64 header
(version, n, p, k, m, N) followed by the bit array. Keys are hex
digest strings — UPPERCASE for sha1, lowercase for sha256 (the
hashlookup convention). Any DCSO-compatible reader works.
Membership answers are probabilistic: p = 1e-4 false-positive rate, no false negatives. Confirm anything important against the source.
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