Pith Number

pith:H4HCK5WM

pith:2008:H4HCK5WMPSYVYNGGV7CAARPRCB

not attested not anchored not stored refs pending

New Measurement of the 2S Hyperfine Interval in Atomic Hydrogen

A. Matveev, C.G. Parthey, J. Alnis, N. Kolachevsky, S.G. Karshenboim, T.W. Haensch

arxiv:0812.3509 v2 · 2008-12-18 · 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{H4HCK5WMPSYVYNGGV7CAARPRCB}

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	2026-05-18T03:24:08.674571Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3f0e2576cc7cb15c34c6afc40045f1105929dccd00df8c63c39ed2942fc8d9b2

Aliases

arxiv: 0812.3509 · arxiv_version: 0812.3509v2 · doi: 10.48550/arxiv.0812.3509 · pith_short_12: H4HCK5WMPSYV · pith_short_16: H4HCK5WMPSYVYNGG · pith_short_8: H4HCK5WM

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/H4HCK5WMPSYVYNGGV7CAARPRCB \
  | 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: 3f0e2576cc7cb15c34c6afc40045f1105929dccd00df8c63c39ed2942fc8d9b2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a0a5f766b5c93a81cdf37cdf4d8f4ecb3275196be94fbe1577ce4d7a85b8c9c5",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.atom-ph",
    "submitted_at": "2008-12-18T18:49:44Z",
    "title_canon_sha256": "c686ce678da5f30e8a57cf5fd76df400912c50cee098aa7b7953b8f86224c1fa"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0812.3509",
    "kind": "arxiv",
    "version": 2
  }
}