Pith Number

pith:PWHJCOI7

pith:2018:PWHJCOI7GFM5OFUVAF44OVWTKE

not attested not anchored not stored refs pending

Towards Adoption of an Optical Second: Verifying Optical Clocks at the SI Limit

A. D. Ludlow, C. W. Oates, D. Nicolodi, H. Leopardi, J. A. Sherman, J. Savory, J. Yao, K. Beloy, R. C. Brown, R. J. Fasano, S. A. Sch\"affer, S. R\"omisch, T. E. Parker, T. M. Fortier, W. F. McGrew, X. Zhang

arxiv:1811.05885 v1 · 2018-11-14 · physics.atom-ph · physics.optics

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

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	2026-05-18T00:00:41.898809Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7d8e91391f3159d716950179c756d35101286df6fc7659033f72d06580ef2818

Aliases

arxiv: 1811.05885 · arxiv_version: 1811.05885v1 · doi: 10.48550/arxiv.1811.05885 · pith_short_12: PWHJCOI7GFM5 · pith_short_16: PWHJCOI7GFM5OFUV · pith_short_8: PWHJCOI7

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/PWHJCOI7GFM5OFUVAF44OVWTKE \
  | 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: 7d8e91391f3159d716950179c756d35101286df6fc7659033f72d06580ef2818

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7ee758d6333553e1180a012649c47fa74625658c32db52f1e788075606e13dab",
    "cross_cats_sorted": [
      "physics.optics"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.atom-ph",
    "submitted_at": "2018-11-14T16:23:13Z",
    "title_canon_sha256": "8451176f686378959c1992dea3689839aa5c6a5361749135d50324e6c1a87200"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1811.05885",
    "kind": "arxiv",
    "version": 1
  }
}