Pith Number

pith:NUQ56NIN

pith:1998:NUQ56NINSJXEN6VMOGBEXSWPO7

not attested not anchored not stored refs pending

Spectroscopy of Quasar Candidates from SDSS Commissioning Data

Brian Yanny (for the SDSS Collaboration), Donald P. Schneider, Gillian R. Knapp, Gregory S. Hennessy, Heidi J. Newberg, James Annis, James E. Gunn, Jeffrey A. Munn, Michael A. Strauss, Robert H. Lupton, Xiaohui Fan, Zeljko Ivezic

arxiv:astro-ph/9812280 v1 · 1998-12-15 · 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{NUQ56NINSJXEN6VMOGBEXSWPO7}

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	2026-07-04T23:54:17.405522Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6d21df350d926e46faac71824bcacf77dd81d9ab91a4921497dd6450b8d311cd

Aliases

arxiv: astro-ph/9812280 · arxiv_version: astro-ph/9812280v1 · doi: 10.48550/arxiv.astro-ph/9812280 · pith_short_12: NUQ56NINSJXE · pith_short_16: NUQ56NINSJXEN6VM · pith_short_8: NUQ56NIN

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/NUQ56NINSJXEN6VMOGBEXSWPO7 \
  | 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: 6d21df350d926e46faac71824bcacf77dd81d9ab91a4921497dd6450b8d311cd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "09e95c2b3a0e09ee5c2dec891ad56368ae93781177291215622ad4e963b750a5",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1998-12-15T16:50:18Z",
    "title_canon_sha256": "89403b3c4b6f7209e13e98d95a3ddc1b450781c97be60f6e51cdc1565185bb4a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9812280",
    "kind": "arxiv",
    "version": 1
  }
}