Pith Number

pith:4GGUNIP7

pith:2014:4GGUNIP7JYNOVWKAFVBGQBRO4J

not attested not anchored not stored refs pending

Frequency ratio of two optical clock transitions in $^{171}$Yb$^+$ and constraints on the time-variation of fundamental constants

H. S. Margolis, J. M. Jones, K. Bongs, K. Szymaniec, L. A. M. Johnson, P. B. R. Nisbet-Jones, P. Gill, R. M. Godun, S. A. King, S. N. Lea

arxiv:1407.0164 v2 · 2014-07-01 · 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{4GGUNIP7JYNOVWKAFVBGQBRO4J}

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	2026-05-18T01:42:43.107888Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e18d46a1ff4e1aead9402d4268062ee27c4566edfd558552155bcfdbba2b4718

Aliases

arxiv: 1407.0164 · arxiv_version: 1407.0164v2 · doi: 10.48550/arxiv.1407.0164 · pith_short_12: 4GGUNIP7JYNO · pith_short_16: 4GGUNIP7JYNOVWKA · pith_short_8: 4GGUNIP7

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/4GGUNIP7JYNOVWKAFVBGQBRO4J \
  | 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: e18d46a1ff4e1aead9402d4268062ee27c4566edfd558552155bcfdbba2b4718

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "77e98fcb13a66b210a54a0bebade4232ef4103bd49298caa4a85f8e6f0b6e9d6",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.atom-ph",
    "submitted_at": "2014-07-01T09:53:07Z",
    "title_canon_sha256": "ed429bbb7364ff8b97040dcd5c682b235f990c293353448987c01e2bc78923b9"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1407.0164",
    "kind": "arxiv",
    "version": 2
  }
}