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rekor-bloom

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bloom-filter

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metadata

license: cc0-1.0
pretty_name: Sigstore Rekor subject-digest bloom filter
tags:
  - bloom-filter
  - file-hashes

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.