Pith Number

pith:EUDNE2MJ

pith:1999:EUDNE2MJUULLXRTO3C7WSOR2RD

not attested not anchored not stored refs pending

Long-term optical variability properties of the Palomar-Green quasars

Dan Maoz, Hagai Netzer, Paul S. Smith, Shai Kaspi, Uriel Giveon

arxiv:astro-ph/9902254 v3 · 1999-02-18 · 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{EUDNE2MJUULLXRTO3C7WSOR2RD}

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	2026-05-18T02:40:34.820608Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2506d26989a516bbc66ed8bf693a3a88f2c56f724ab9feb63a0e0ad3b38ddd40

Aliases

arxiv: astro-ph/9902254 · arxiv_version: astro-ph/9902254v3 · doi: 10.48550/arxiv.astro-ph/9902254 · pith_short_12: EUDNE2MJUULL · pith_short_16: EUDNE2MJUULLXRTO · pith_short_8: EUDNE2MJ

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/EUDNE2MJUULLXRTO3C7WSOR2RD \
  | 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: 2506d26989a516bbc66ed8bf693a3a88f2c56f724ab9feb63a0e0ad3b38ddd40

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "54bccad49eb11c3dfebf18cee4cb2b5339bc7c8917796d9e74352f69c26395b2",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-02-18T10:56:35Z",
    "title_canon_sha256": "7bf00a39ea7c81c5fc7431b0c0465be011eb6814df5b6bdbc35eff90dc52f488"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9902254",
    "kind": "arxiv",
    "version": 3
  }
}