Pith Number

pith:Z5AQWXPW

pith:2021:Z5AQWXPWDMME7X6WH62LRBUVXY

not attested not anchored not stored refs pending

Optical coherence between atomic species at the second scale: improved clock comparisons via differential spectroscopy

Andrw D. Ludlow, David B. Hume, David R. Leibrandt, Ethan R. Clements, Holly Leopardi, Jose L. Valencia, May E. Kim, Nicholas V. Nardelli, Tara M. Fortier, William F. McGrew, Xiaogang Zhang, Youssef S. Hassan

arxiv:2109.09540 v2 · 2021-09-20 · physics.atom-ph · physics.optics

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{Z5AQWXPWDMME7X6WH62LRBUVXY}

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	2026-07-05T03:34:46.845106Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

cf410b5df61b184fdfd63fb4b88695be142dd754f98c35bd5d7308154cc8395a

Aliases

arxiv: 2109.09540 · arxiv_version: 2109.09540v2 · doi: 10.48550/arxiv.2109.09540 · pith_short_12: Z5AQWXPWDMME · pith_short_16: Z5AQWXPWDMME7X6W · pith_short_8: Z5AQWXPW

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/Z5AQWXPWDMME7X6WH62LRBUVXY \
  | 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: cf410b5df61b184fdfd63fb4b88695be142dd754f98c35bd5d7308154cc8395a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "75d624af739782e8b8df13b7cd2c20807d60d97eb0caa198d358a67e8a3d665f",
    "cross_cats_sorted": [
      "physics.optics"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "physics.atom-ph",
    "submitted_at": "2021-09-20T13:48:42Z",
    "title_canon_sha256": "5d1aa92a5f1bb466706c374d56941e85e137fdc338ac1e3982fe411d639520d4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2109.09540",
    "kind": "arxiv",
    "version": 2
  }
}