Pith Number

pith:DK7YPRCU

pith:2009:DK7YPRCU4RFV5W6UJQXIJTTQRF

not attested not anchored not stored refs pending

Optical frequency transfer via 146 km fiber link with 10^{-19} relative accuracy

B. Lipphardt, F. Vogt, G. Grosche, H. Schnatz, K. Predehl, O. Terra, R. Holzwarth, U. Sterr

arxiv:0904.2679 v1 · 2009-04-17 · 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{DK7YPRCU4RFV5W6UJQXIJTTQRF}

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	2026-05-18T01:17:21.430570Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1abf87c454e44b5edbd44c2e84ce7089420a05fca2f69dec35a4f321045a93d1

Aliases

arxiv: 0904.2679 · arxiv_version: 0904.2679v1 · doi: 10.48550/arxiv.0904.2679 · pith_short_12: DK7YPRCU4RFV · pith_short_16: DK7YPRCU4RFV5W6U · pith_short_8: DK7YPRCU

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/DK7YPRCU4RFV5W6UJQXIJTTQRF \
  | 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: 1abf87c454e44b5edbd44c2e84ce7089420a05fca2f69dec35a4f321045a93d1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "aaf7309d2af4f95489188a4dcd07735f99dc8767e87f8271efbeaaa4f2e1f0de",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.optics",
    "submitted_at": "2009-04-17T11:54:53Z",
    "title_canon_sha256": "cfd829f39caa02a30015dc1ebbec446aa3f77b05c4a49cf77a2b474816ebb048"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.2679",
    "kind": "arxiv",
    "version": 1
  }
}