Pith Number

pith:KXDX3PUP

pith:2004:KXDX3PUPJJMYGQRXVUE5W4I5FN

not attested not anchored not stored refs pending

Atomic Clocks and the Search for Variation of the Fine Structure Constant

E. J. Angstmann, V. A. Dzuba, V. V. Flambaum

arxiv:physics/0407141 v1 · 2004-07-28 · 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{KXDX3PUPJJMYGQRXVUE5W4I5FN}

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	2026-05-18T01:05:08.751201Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

55c77dbe8f4a59834237ad09db711d2b4536036c4b7427a615fabbab6dacb88c

Aliases

arxiv: physics/0407141 · arxiv_version: physics/0407141v1 · doi: 10.48550/arxiv.physics/0407141 · pith_short_12: KXDX3PUPJJMY · pith_short_16: KXDX3PUPJJMYGQRX · pith_short_8: KXDX3PUP

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/KXDX3PUPJJMYGQRXVUE5W4I5FN \
  | 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: 55c77dbe8f4a59834237ad09db711d2b4536036c4b7427a615fabbab6dacb88c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "433d974eb66d2128e96ec449b60d648992d6146170861975d79ad905165ce8f0",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "physics.atom-ph",
    "submitted_at": "2004-07-28T22:47:55Z",
    "title_canon_sha256": "71e57bc52038be8a5b0277270150b0bc6fe37075cd076fdfa76e7f17375e321a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "physics/0407141",
    "kind": "arxiv",
    "version": 1
  }
}