Pith Number

pith:ITAYLPJS

pith:2019:ITAYLPJST2XZS7QDR3CL37DDHV

not attested not anchored not stored refs pending

State of the art in the determination of the fine structure constant and the ratio $h/m_\mathrm{u}$

Fran\c{c}ois Biraben, Fran\c{c}ois Nez, Pierre Clad\'e, Sa\"ida Guellati-Khelifa

arxiv:1901.01990 v1 · 2019-01-06 · 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{ITAYLPJST2XZS7QDR3CL37DDHV}

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	2026-05-17T23:42:24.853258Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

44c185bd329eaf997e038ec4bdfc633d780330b806d712b2171cea46d0c94aac

Aliases

arxiv: 1901.01990 · arxiv_version: 1901.01990v1 · doi: 10.48550/arxiv.1901.01990 · pith_short_12: ITAYLPJST2XZ · pith_short_16: ITAYLPJST2XZS7QD · pith_short_8: ITAYLPJS

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/ITAYLPJST2XZS7QDR3CL37DDHV \
  | 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: 44c185bd329eaf997e038ec4bdfc633d780330b806d712b2171cea46d0c94aac

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "578887aebeb7e3248f8f8504648146c145fbf211502eb3d1b22921cb8912e1cf",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.atom-ph",
    "submitted_at": "2019-01-06T21:19:37Z",
    "title_canon_sha256": "0e9d0cb4a551397c945fb6600bc6486a342ab6d7a106606e2b054af83e3c42ac"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1901.01990",
    "kind": "arxiv",
    "version": 1
  }
}