Pith Number

pith:GQHH37KT

pith:2013:GQHH37KT3EO4SGUXJLX3FVDQCO

not attested not anchored not stored refs pending

Analysis of Molecular Hydrogen Absorption toward QSO B0642-5038 for a Varying Proton-to-Electron Mass Ratio

(2) Swinburne University of Technology), Jonathan B. Whitmore (2)((1) VU University Amsterdam, Julija Bagdonaite (1), Michael T. Murphy (2), Wim Ubachs (1)

arxiv:1308.1330 v2 · 2013-08-06 · 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{GQHH37KT3EO4SGUXJLX3FVDQCO}

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	2026-05-18T01:48:23.119118Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

340e7dfd53d91dc91a974aefb2d47013b2360122848ee95accc6e8dc168f70e9

Aliases

arxiv: 1308.1330 · arxiv_version: 1308.1330v2 · doi: 10.48550/arxiv.1308.1330 · pith_short_12: GQHH37KT3EO4 · pith_short_16: GQHH37KT3EO4SGUX · pith_short_8: GQHH37KT

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/GQHH37KT3EO4SGUXJLX3FVDQCO \
  | 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: 340e7dfd53d91dc91a974aefb2d47013b2360122848ee95accc6e8dc168f70e9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1c06fde454c35dbe69224d43e4be0aaa601d9e8d62befd4516e81bea222955d8",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2013-08-06T16:23:46Z",
    "title_canon_sha256": "54ecbb92a35c4a7160da61b506a4459492e5f8e6ff215dd27fb9f1dbd3fcc69a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1308.1330",
    "kind": "arxiv",
    "version": 2
  }
}