Pith Number

pith:U7ET373R

pith:2020:U7ET373RM4ROJDD6PRFH3XYGRH

not attested not anchored not stored refs pending

Optical frequency ratio of a ${}^{171}\mathrm{Yb}^+$ single-ion clock and a ${}^{87}\mathrm{Sr}$ lattice clock

Burghard Lipphardt, Christian Lisdat, Ekkehard Peik, Erik Benkler, Nils Huntemann, Richard Lange, Roman Schwarz, S\"oren D\"orscher, Uwe Sterr

arxiv:2009.05470 v1 · 2020-09-11 · 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{U7ET373RM4ROJDD6PRFH3XYGRH}

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	2026-07-05T02:12:03.560060Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a7c93dff716722e48c7e7c4a7ddf0689deada649059ff96773e32b03da1941ac

Aliases

arxiv: 2009.05470 · arxiv_version: 2009.05470v1 · doi: 10.48550/arxiv.2009.05470 · pith_short_12: U7ET373RM4RO · pith_short_16: U7ET373RM4ROJDD6 · pith_short_8: U7ET373R

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/U7ET373RM4ROJDD6PRFH3XYGRH \
  | 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: a7c93dff716722e48c7e7c4a7ddf0689deada649059ff96773e32b03da1941ac

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "589e66f2bd9655c883cb9eaa98378a57aba6f2d6782e863fbca4bf08eb13b375",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.atom-ph",
    "submitted_at": "2020-09-11T14:46:37Z",
    "title_canon_sha256": "c304271868e24c414edec5c7f49869ef7328fa3b6e410d2784d98deba48834c9"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2009.05470",
    "kind": "arxiv",
    "version": 1
  }
}