Pith Number

pith:4P7L3J4W

pith:1993:4P7L3J4WJZBLARJHQLJJNT4FTA

not attested not anchored not stored refs pending

Is Dark Matter in Spiral Galaxies Cold Gas? I. Observational Constraints and Dynamical Clues About Galaxy Evolution

D. Pfenniger, F. Combes & L. Martinet

arxiv:astro-ph/9311043 v1 · 1993-11-18 · 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{4P7L3J4WJZBLARJHQLJJNT4FTA}

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	2026-05-18T04:21:41.289436Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e3febda7964e42b0452782d296cf85981037164f02c50533b35f5ed2edfe3fa0

Aliases

arxiv: astro-ph/9311043 · arxiv_version: astro-ph/9311043v1 · doi: 10.48550/arxiv.astro-ph/9311043 · pith_short_12: 4P7L3J4WJZBL · pith_short_16: 4P7L3J4WJZBLARJH · pith_short_8: 4P7L3J4W

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/4P7L3J4WJZBLARJHQLJJNT4FTA \
  | 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: e3febda7964e42b0452782d296cf85981037164f02c50533b35f5ed2edfe3fa0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "03f2469097ba1f670e8d807189a0cc49c9ad52cfa5a32a23b9baa8a07b28c414",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1993-11-18T10:48:00Z",
    "title_canon_sha256": "a5d0ad5bacc4531ee23269a391636652b8a2c65fcce1d34a471885267b9296f4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9311043",
    "kind": "arxiv",
    "version": 1
  }
}