Pith Number

pith:5KANXQ7S

pith:1998:5KANXQ7STY4MJ4LBGSTNMUGRAI

not attested not anchored not stored refs pending

The fine-structure constant: a new observational limit on its cosmological variation and some theoretical consequences

A.V. Ivanchik, A.Y. Potekhin, D.A. Varshalovich (Ioffe Phys.-Tech. Institute, St.-Petersburg)

arxiv:astro-ph/9810166 v1 · 1998-10-10 · astro-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{5KANXQ7STY4MJ4LBGSTNMUGRAI}

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	2026-05-18T04:21:40.005765Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ea80dbc3f29e38c4f16134a6d650d102262a535aa5c36b84156779aa672c2157

Aliases

arxiv: astro-ph/9810166 · arxiv_version: astro-ph/9810166v1 · doi: 10.48550/arxiv.astro-ph/9810166 · pith_short_12: 5KANXQ7STY4M · pith_short_16: 5KANXQ7STY4MJ4LB · pith_short_8: 5KANXQ7S

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/5KANXQ7STY4MJ4LBGSTNMUGRAI \
  | 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: ea80dbc3f29e38c4f16134a6d650d102262a535aa5c36b84156779aa672c2157

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6e3c87573baec635d9a091012594d92dd10f1643ca0517b4aef0847d2ac6d6ad",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1998-10-10T12:45:41Z",
    "title_canon_sha256": "52317c42a7cad62fc17a731496eeeeecfc1ef9b0376f6a6b256dc570866bc673"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9810166",
    "kind": "arxiv",
    "version": 1
  }
}