Pith Number

pith:2ZV3NAWB

pith:2004:2ZV3NAWBLRR7KKHOVVEQ73TG2Y

not attested not anchored not stored refs pending

Spectral Classification of Quasars in the Sloan Digital Sky Survey: Eigenspectra; Redshift and Luminosity Effects

A. J. Connolly, A. M. Hopkins, A. S. Szalay, C. W. Yip, D. E. Vanden Berk, D. P. Schneider, G. T. Richards, J. A. Frieman, J. Brinkmann, J. Trump, M. Subbarao, P. B. Hall, Z. Ma

arxiv:astro-ph/0408578 v1 · 2004-08-31 · 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{2ZV3NAWBLRR7KKHOVVEQ73TG2Y}

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	2026-07-04T15:48:11.848827Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d66bb682c15c63f528eead490fee66d600be55ab980b6f08cc793d95e040b7fc

Aliases

arxiv: astro-ph/0408578 · arxiv_version: astro-ph/0408578v1 · doi: 10.48550/arxiv.astro-ph/0408578 · pith_short_12: 2ZV3NAWBLRR7 · pith_short_16: 2ZV3NAWBLRR7KKHO · pith_short_8: 2ZV3NAWB

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/2ZV3NAWBLRR7KKHOVVEQ73TG2Y \
  | 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: d66bb682c15c63f528eead490fee66d600be55ab980b6f08cc793d95e040b7fc

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "03e5ff00ae6559a74c17580a80a5111101bff086c46a7f13a7907216638a3e43",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2004-08-31T12:52:24Z",
    "title_canon_sha256": "9fc555f2ff0d5bebea20428de3e1cb9e46592f2f2cac90b596dc2b6b029ab2a1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0408578",
    "kind": "arxiv",
    "version": 1
  }
}