Pith Number

pith:DULYCRFS

pith:2018:DULYCRFSNHXFEXCXUK5K7YGURN

not attested not anchored not stored refs pending

Ultrahigh-precision measurement of the $n=2$ triplet P fine structure of atomic helium using frequency-offset separated oscillatory fields

E.A. Hessels, K. Kato, T.D.G. Skinner

arxiv:1807.07923 v1 · 2018-07-20 · 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{DULYCRFSNHXFEXCXUK5K7YGURN}

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	2026-05-18T00:03:46.101946Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1d178144b269ee525c57a2baafe0d48b494d2a43151f5c2a4087d02853523a79

Aliases

arxiv: 1807.07923 · arxiv_version: 1807.07923v1 · doi: 10.48550/arxiv.1807.07923 · pith_short_12: DULYCRFSNHXF · pith_short_16: DULYCRFSNHXFEXCX · pith_short_8: DULYCRFS

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/DULYCRFSNHXFEXCXUK5K7YGURN \
  | 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: 1d178144b269ee525c57a2baafe0d48b494d2a43151f5c2a4087d02853523a79

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1a70ecda32f0c4f7687f44a98b51ac8d942e22bf5c24dd23c151b7389dfd59c0",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.atom-ph",
    "submitted_at": "2018-07-20T16:31:28Z",
    "title_canon_sha256": "c52fdf760b631d74ff1a0bb5d7a47a25441013a780c3057c553e9d8098111b24"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1807.07923",
    "kind": "arxiv",
    "version": 1
  }
}