Pith Number

pith:5P6FYZJU

pith:2000:5P6FYZJUFZFEGK7EBMGDJT4UO2

not attested not anchored not stored refs pending

The Optical Gravitational Lensing Experiment. A Hunt for Caustic Crossings in QSO 2237+0305

(2) Warsaw University Observatory), A. Udalski (2), G. Pietrzynski (2), I. Soszynski (2), K. Zebrun (2). ((1) Princeton University Observatory, M. Kubiak (2), M. Szymanski (2), P.R. Wozniak (1)

arxiv:astro-ph/0004287 v1 · 2000-04-20 · astro-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{5P6FYZJUFZFEGK7EBMGDJT4UO2}

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	2026-07-04T16:16:19.833382Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ebfc5c65342e4a432be40b0c34cf94768ed239b4f44761a6ce6d360c5ae23116

Aliases

arxiv: astro-ph/0004287 · arxiv_version: astro-ph/0004287v1 · doi: 10.48550/arxiv.astro-ph/0004287 · pith_short_12: 5P6FYZJUFZFE · pith_short_16: 5P6FYZJUFZFEGK7E · pith_short_8: 5P6FYZJU

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/5P6FYZJUFZFEGK7EBMGDJT4UO2 \
  | 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: ebfc5c65342e4a432be40b0c34cf94768ed239b4f44761a6ce6d360c5ae23116

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a5393e4b697780f11577c0fb2880c7c7f57fe8342775cc56b227607eb7f494b5",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2000-04-20T16:41:17Z",
    "title_canon_sha256": "b491857048e0620a1fcc5cdcac69e4b80401128bb8dc1cf57af66031f014c175"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0004287",
    "kind": "arxiv",
    "version": 1
  }
}