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Fatcat scholarly-file bloom filters
Membership filters over the file hashes in fatcat, the Internet
Archive's bibliographic catalog behind
scholar.archive.org — i.e. the
scholarly PDFs (and related files) IA has preserved. Extracted from
file_hashes.tsv.gz in the
2024-02-18 bulk export
(the final export; the fatcat project is frozen). Fatcat metadata is
CC0.
- fatcat.sha1.bloom: 122,304,451 sha1 keys (UPPERCASE hex), 279 MiB
- fatcat.sha256.bloom: 122,245,201 sha256 keys (lowercase hex), 279 MiB
- p = 1e-4 each; a file matching both filters is corroborated far beyond the single-filter false-positive rate
- Coverage ends at the 2024-02-18 export; open-access material is well covered, paywalled-publisher PDFs often are not (per-download watermarking gives every copy unique bytes)
Rebuild
./fatcat_extract.sh in this repo: downloads the 14 GiB export TSV,
splits/dedupes the hash columns, builds both filters.
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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