Pith Number

pith:JJYNCHNQ

pith:2001:JJYNCHNQV5QHZ53SEB2BWOJNZH

not attested not anchored not stored refs pending

Improved constraints on possible variation of physical constants from H I 21cm and molecular QSO absorption lines

F. Combes (Paris Obs.), J. K. Webb (UNSW), M. J. Drinkwater (UMelb), M. T. Murphy (UNSW), T. Wiklind (OSO), V. V. Flambaum (UNSW)

arxiv:astro-ph/0101519 v2 · 2001-01-29 · 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{JJYNCHNQV5QHZ53SEB2BWOJNZH}

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	2026-07-04T15:48:02.194648Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4a70d11db0af607cf77220741b392dc9fb435c0e22e502a394a19ad175b9b079

Aliases

arxiv: astro-ph/0101519 · arxiv_version: astro-ph/0101519v2 · doi: 10.48550/arxiv.astro-ph/0101519 · pith_short_12: JJYNCHNQV5QH · pith_short_16: JJYNCHNQV5QHZ53S · pith_short_8: JJYNCHNQ

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/JJYNCHNQV5QHZ53SEB2BWOJNZH \
  | 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: 4a70d11db0af607cf77220741b392dc9fb435c0e22e502a394a19ad175b9b079

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d3587ad0183156b1572aff60bc00e50bab63324aa025e4a4a2a4b2dd6f7aa902",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2001-01-29T22:49:39Z",
    "title_canon_sha256": "eff921d24d47c07f2958a0f0bda0bb3c93645ea0273c3f3ffcbac141b19c97f0"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0101519",
    "kind": "arxiv",
    "version": 2
  }
}