Pith Number

pith:P2QF72XV

pith:2003:P2QF72XVJJWHIT4FPNR267BW3Q

not attested not anchored not stored refs pending

Spatial Variation of the Fine-Structure Parameter and the Cosmic Microwave Background

Andriy Kurylov, Kris Sigurdson, Marc Kamionkowski (Caltech)

arxiv:astro-ph/0306372 v2 · 2003-06-19 · astro-ph · hep-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{P2QF72XVJJWHIT4FPNR267BW3Q}

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	2026-05-18T02:40:27.007389Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7ea05feaf54a6c744f857b63af7c36dc2890b9764644b572c63754e6da92c025

Aliases

arxiv: astro-ph/0306372 · arxiv_version: astro-ph/0306372v2 · doi: 10.48550/arxiv.astro-ph/0306372 · pith_short_12: P2QF72XVJJWH · pith_short_16: P2QF72XVJJWHIT4F · pith_short_8: P2QF72XV

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/P2QF72XVJJWHIT4FPNR267BW3Q \
  | 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: 7ea05feaf54a6c744f857b63af7c36dc2890b9764644b572c63754e6da92c025

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "81844fab6391089debf3ab86ddb5cb821f5313daffbf72bf04452083167ff09d",
    "cross_cats_sorted": [
      "hep-ph"
    ],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2003-06-19T07:01:05Z",
    "title_canon_sha256": "358384c6bb35ec650fe646a85e67f677c959f9ea5b05d60dc7c724c50223216f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0306372",
    "kind": "arxiv",
    "version": 2
  }
}