Pith Number

pith:PJC2FQ3J

pith:2010:PJC2FQ3J455VWHWGDSCPXQKIVP

not attested not anchored not stored refs pending

Probing fundamental constant evolution with neutral atomic gas lines

2), Canada), India; (2) National Radio Astronomy Observatory, J. N. Chengalur (1) ((1) National Centre for Radio Astrophysics, J. X. Prochaska (3), N. Kanekar (1, S. L. Ellison (4), USA; (3) UCO/Lick Observatory, USA; (4) University of Victoria

arxiv:1003.0444 v1 · 2010-03-01 · astro-ph.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{PJC2FQ3J455VWHWGDSCPXQKIVP}

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	2026-05-18T02:08:47.890515Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7a45a2c369e77b5b1ec61c84fbc148abd07f983764c352ed8555370aba1f49cd

Aliases

arxiv: 1003.0444 · arxiv_version: 1003.0444v1 · doi: 10.48550/arxiv.1003.0444 · pith_short_12: PJC2FQ3J455V · pith_short_16: PJC2FQ3J455VWHWG · pith_short_8: PJC2FQ3J

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/PJC2FQ3J455VWHWGDSCPXQKIVP \
  | 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: 7a45a2c369e77b5b1ec61c84fbc148abd07f983764c352ed8555370aba1f49cd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ef7ae71762aa67a6c7089d26a679d5dcdf763685b68326adfba1a7918c886803",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2010-03-01T23:43:20Z",
    "title_canon_sha256": "a7eecfd7df8ae25ec657fe1e8361248dc07253e97c15a14b0043bf50943a963f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1003.0444",
    "kind": "arxiv",
    "version": 1
  }
}