Pith Number

pith:KW2IHUG3

pith:2014:KW2IHUG36CO366TRUGWJYDAE3U

not attested not anchored not stored refs pending

Evaluating the performance of the NPL femtosecond frequency combs: Agreement at the $10^{-21}$ level

H. S. Margolis, L. A. M. Johnson, P. Gill

arxiv:1408.2387 v1 · 2014-08-11 · 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{KW2IHUG36CO366TRUGWJYDAE3U}

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	2026-05-18T01:42:21.892490Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

55b483d0dbf09dbf7a71a1ac9c0c04dd2ad3d215f1584951438af70c4f8b4bcf

Aliases

arxiv: 1408.2387 · arxiv_version: 1408.2387v1 · doi: 10.48550/arxiv.1408.2387 · pith_short_12: KW2IHUG36CO3 · pith_short_16: KW2IHUG36CO366TR · pith_short_8: KW2IHUG3

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/KW2IHUG36CO366TRUGWJYDAE3U \
  | 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: 55b483d0dbf09dbf7a71a1ac9c0c04dd2ad3d215f1584951438af70c4f8b4bcf

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7b49012472ed844caa83dc34872df6392cd87ed21f02380b9314ff3525027db9",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.optics",
    "submitted_at": "2014-08-11T12:30:23Z",
    "title_canon_sha256": "4277a9dd7d4afca9d593353074be5dbfa1cccf83a961cb1e97905d702189437e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1408.2387",
    "kind": "arxiv",
    "version": 1
  }
}