Pith Number

pith:JODPHN2G

pith:2012:JODPHN2GVOPYKS3LBSSK4V7FYT

not attested not anchored not stored refs pending

Searching for variations in the fine-structure constant and the proton-to-electron mass ratio using quasar absorption lines

Julian A. King

arxiv:1202.6365 v1 · 2012-02-28 · astro-ph.CO · gr-qc · hep-ph · physics.atom-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{JODPHN2GVOPYKS3LBSSK4V7FYT}

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	2026-05-18T04:01:12.768532Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4b86f3b746ab9f854b6b0ca4ae57e5c4f635e00959ef07fa4782b3d098272453

Aliases

arxiv: 1202.6365 · arxiv_version: 1202.6365v1 · doi: 10.48550/arxiv.1202.6365 · pith_short_12: JODPHN2GVOPY · pith_short_16: JODPHN2GVOPYKS3L · pith_short_8: JODPHN2G

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/JODPHN2GVOPYKS3LBSSK4V7FYT \
  | 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: 4b86f3b746ab9f854b6b0ca4ae57e5c4f635e00959ef07fa4782b3d098272453

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b647226350e2c14ca29e4409107e31f8a8d65b009ed670dfd4579626e55b8a6a",
    "cross_cats_sorted": [
      "gr-qc",
      "hep-ph",
      "physics.atom-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2012-02-28T21:00:01Z",
    "title_canon_sha256": "353ba561005462852d2be234709b9de5164adc3c702d86f27621248a55423b49"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1202.6365",
    "kind": "arxiv",
    "version": 1
  }
}