Pith Number

pith:D2BBRNXP

pith:2009:D2BBRNXPJOXOHPUGZYFY4R4RWX

not attested not anchored not stored refs pending

Long-distance remote comparison of ultrastable optical frequencies with 1e-15 instability in fractions of a second

Andre Pape, Burghard Lipphardt, Ernst-Maria Rasel, Gesine Grosche, Harald Schnatz, Jan Friebe, Katharina Predehl, Matthias Riedmann, Osama Terra, Temmo W\"ubbena, Thomas Legero

arxiv:0908.4238 v3 · 2009-08-28 · physics.optics · physics.gen-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{D2BBRNXPJOXOHPUGZYFY4R4RWX}

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	2026-05-18T00:39:41.405436Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1e8218b6ef4baee3be86ce0b8e4791b5cbbbc9b6d42a9ad37e476ed05298c194

Aliases

arxiv: 0908.4238 · arxiv_version: 0908.4238v3 · doi: 10.48550/arxiv.0908.4238 · pith_short_12: D2BBRNXPJOXO · pith_short_16: D2BBRNXPJOXOHPUG · pith_short_8: D2BBRNXP

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/D2BBRNXPJOXOHPUGZYFY4R4RWX \
  | 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: 1e8218b6ef4baee3be86ce0b8e4791b5cbbbc9b6d42a9ad37e476ed05298c194

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "375bddf4e7923e485f90d712fa90710fdc5b3fedb3381155b32fb975ed4e0bcb",
    "cross_cats_sorted": [
      "physics.gen-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.optics",
    "submitted_at": "2009-08-28T16:43:47Z",
    "title_canon_sha256": "775997c02ff9fbf344c7fe31af2b7470f351caf6fc5f624f927b46225d71bde4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0908.4238",
    "kind": "arxiv",
    "version": 3
  }
}