Pith Number

pith:IAL3N7ED

pith:2020:IAL3N7EDOJJUGIASJESYMRNWW6

not attested not anchored not stored refs pending

Four direct measurements of the fine-structure constant 13 billion years ago

Ana Catarina Leite, Carlos J.A.P. Martins, Chung-Chi Lee, Dinko Milakovic, Jochen Liske, John D. Barrow, John K. Webb, Katarzyna Leszczynska, Konrad Marosek, Luca Pasquini, Mariusz P. Dabrowski, Matthew Bainbridge, Michael R. Wilczynska, Paolo Molaro, Robert F. Carswell, Sarah E. I. Bosman, Vincent Dumont

arxiv:2003.07627 v1 · 2020-03-17 · astro-ph.CO · astro-ph.GA · gr-qc

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{IAL3N7EDOJJUGIASJESYMRNWW6}

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	2026-07-05T00:48:28.519842Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4017b6fc83725343201249258645b6b7b01298024bba48bdd5ad71b1ac3e7b54

Aliases

arxiv: 2003.07627 · arxiv_version: 2003.07627v1 · doi: 10.48550/arxiv.2003.07627 · pith_short_12: IAL3N7EDOJJU · pith_short_16: IAL3N7EDOJJUGIAS · pith_short_8: IAL3N7ED

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/IAL3N7EDOJJUGIASJESYMRNWW6 \
  | 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: 4017b6fc83725343201249258645b6b7b01298024bba48bdd5ad71b1ac3e7b54

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9af7360d63e53a33feabf1106c22274845476bb463f484175bf4851c5493b5d2",
    "cross_cats_sorted": [
      "astro-ph.GA",
      "gr-qc"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2020-03-17T10:35:00Z",
    "title_canon_sha256": "e399980423f0195e280737f0af72863b1f3147b3a2fe7f0ce16aaa6d3880235f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2003.07627",
    "kind": "arxiv",
    "version": 1
  }
}