Pith Number

pith:CAHHQYOW

pith:2009:CAHHQYOWZI7XSF42LVVWM227ML

not attested not anchored not stored refs pending

Constraining fundamental constants of physics with quasar absorption line systems

Alexander Ivanchik, Hum Chand, Neeraj Gupta, Pasquier Noterdaeme, Patrick Petitjean, Raghunathan Srianand

arxiv:0905.1516 v1 · 2009-05-11 · 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{CAHHQYOWZI7XSF42LVVWM227ML}

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	2026-05-18T02:13:45.981763Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

100e7861d6ca3f79179a5d6b666b5f62f159ba30199858b01e48c03b055306f5

Aliases

arxiv: 0905.1516 · arxiv_version: 0905.1516v1 · doi: 10.48550/arxiv.0905.1516 · pith_short_12: CAHHQYOWZI7X · pith_short_16: CAHHQYOWZI7XSF42 · pith_short_8: CAHHQYOW

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/CAHHQYOWZI7XSF42LVVWM227ML \
  | 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: 100e7861d6ca3f79179a5d6b666b5f62f159ba30199858b01e48c03b055306f5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e12f54879f08452ef47de9b5e47c8e0f778ae7e5337b5c86387207cde7fb2685",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-05-11T12:25:41Z",
    "title_canon_sha256": "191eeda71e2fae269b228cd962bfa5a181550187b378f97c121c97fba5d604ec"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0905.1516",
    "kind": "arxiv",
    "version": 1
  }
}