Pith Number

pith:7BQSJH4S

pith:1998:7BQSJH4SHJDKWQWZD7QIDGIZZ4

not attested not anchored not stored refs pending

An Automated Cluster Finder: the Adaptive Matched Filter

Guohong Xu (Princeton University Observatory), James Gunn, Jeremy Kepner (MIT Lincoln Lab), Neta Bahcall, Robert Lupton, Xiaohui Fan

arxiv:astro-ph/9803125 v2 · 1998-03-11 · astro-ph

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{7BQSJH4SHJDKWQWZD7QIDGIZZ4}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-05-18T04:37:11.838203Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f861249f923a46ab42d91fe0819919cf377249ecbfba96e59f3fadf70459c3fc

Aliases

arxiv: astro-ph/9803125 · arxiv_version: astro-ph/9803125v2 · doi: 10.48550/arxiv.astro-ph/9803125 · pith_short_12: 7BQSJH4SHJDK · pith_short_16: 7BQSJH4SHJDKWQWZ · pith_short_8: 7BQSJH4S

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/7BQSJH4SHJDKWQWZD7QIDGIZZ4 \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: f861249f923a46ab42d91fe0819919cf377249ecbfba96e59f3fadf70459c3fc

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "21b799badb5d998b6596112d495c20c69b3b62dddb8b7db5136efd3e0f73a603",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1998-03-11T01:18:21Z",
    "title_canon_sha256": "68c9396b77451b63ce75cfee5d88649cf23612540f939a42a5e08ce54468ea0b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9803125",
    "kind": "arxiv",
    "version": 2
  }
}