Pith Number

pith:4CGLQ5EN

pith:2000:4CGLQ5ENQVYQ3VPS76WNNMPHAN

not attested not anchored not stored refs pending

Further constraints on variation of the fine structure constant from alkali doublet QSO absorption lines

A. M. Wolfe (UCSD), J. K. Webb (UNSW), J. X. Prochaska (OCIW), M. T. Murphy (UNSW), V. V. Flambaum (UNSW)

arxiv:astro-ph/0012421 v3 · 2000-12-20 · 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{4CGLQ5ENQVYQ3VPS76WNNMPHAN}

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	2026-07-04T15:48:02.128821Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e08cb8748d85710dd5f2ffacd6b1e70347438ea96553eea45ef803e14c8f12f8

Aliases

arxiv: astro-ph/0012421 · arxiv_version: astro-ph/0012421v3 · doi: 10.48550/arxiv.astro-ph/0012421 · pith_short_12: 4CGLQ5ENQVYQ · pith_short_16: 4CGLQ5ENQVYQ3VPS · pith_short_8: 4CGLQ5EN

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/4CGLQ5ENQVYQ3VPS76WNNMPHAN \
  | 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: e08cb8748d85710dd5f2ffacd6b1e70347438ea96553eea45ef803e14c8f12f8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "dcc4270ae6f3f3802d6348d4b896683e29a50831a506704b467f6f4719b80724",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2000-12-20T06:14:36Z",
    "title_canon_sha256": "ba9338394e3e013d9db46ff40fd28e21303237113c2722eed084a0c2abac47ad"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0012421",
    "kind": "arxiv",
    "version": 3
  }
}