Pith Number

pith:ZNO3ZFH5

pith:2000:ZNO3ZFH57DW2HSEBN3TOSOK4EU

not attested not anchored not stored refs pending

Possible evidence for a variable fine structure constant from QSO absorption lines: systematic errors

C. W. Churchill (PSU), J. K. Webb (UNSW), J. X. Prochaska (OCIW), M. T. Murphy (UNSW), V. V. Flambaum (UNSW)

arxiv:astro-ph/0012420 v4 · 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{ZNO3ZFH57DW2HSEBN3TOSOK4EU}

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	2026-07-04T15:48:02.103334Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

cb5dbc94fdf8eda3c8816ee6e9395c253f81e90da30d5fa532bc95e318f74e14

Aliases

arxiv: astro-ph/0012420 · arxiv_version: astro-ph/0012420v4 · doi: 10.48550/arxiv.astro-ph/0012420 · pith_short_12: ZNO3ZFH57DW2 · pith_short_16: ZNO3ZFH57DW2HSEB · pith_short_8: ZNO3ZFH5

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/ZNO3ZFH57DW2HSEBN3TOSOK4EU \
  | 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: cb5dbc94fdf8eda3c8816ee6e9395c253f81e90da30d5fa532bc95e318f74e14

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1d510bdbfe8336fd8d0e3a37ba1c1d694fc4d76d08d7652bb149ce482beb7be3",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2000-12-20T06:11:02Z",
    "title_canon_sha256": "3f9c62c9b53bf99d124c7783b152e59e7daa9635acaec93464d55bfca615377e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0012420",
    "kind": "arxiv",
    "version": 4
  }
}