Pith Number

pith:KYRF74I7

pith:1999:KYRF74I72KV7Z57UNQWIIZIDBN

not attested not anchored not stored refs pending

High-Redshift Quasars Found in Sloan Digital Sky Survey Commissioning Data II: The Spring Equatorial Stripe

et al, SDSS Collaboration, Xiaohui Fan

arxiv:astro-ph/9909169 v2 · 1999-09-10 · 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{KYRF74I72KV7Z57UNQWIIZIDBN}

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	2026-05-18T01:40:12.717633Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

56225ff11fd2abfcf7f46c2c8465030b63531c2c8773a2fdfe9ca3462f0c6062

Aliases

arxiv: astro-ph/9909169 · arxiv_version: astro-ph/9909169v2 · doi: 10.48550/arxiv.astro-ph/9909169 · pith_short_12: KYRF74I72KV7 · pith_short_16: KYRF74I72KV7Z57U · pith_short_8: KYRF74I7

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/KYRF74I72KV7Z57UNQWIIZIDBN \
  | 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: 56225ff11fd2abfcf7f46c2c8465030b63531c2c8773a2fdfe9ca3462f0c6062

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1de4717f0c460a2f736cec896928a2388789de0ee22838a1030b74b9ef4bb51e",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-09-10T01:36:01Z",
    "title_canon_sha256": "8505b8d1adb03dc5f8c304be0f01116b6fce237257cf913749e0d791c15027fe"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9909169",
    "kind": "arxiv",
    "version": 2
  }
}