Pith Number

pith:B7Z7ZI7U

pith:1999:B7Z7ZI7UCMN7577Q2ENWKVU7MC

not attested not anchored not stored refs pending

The Discovery of a High-redshift Quasar without Emission Lines from Sloan Digital Sky Survey Commissioning Data

et al, SDSS Collaboration, Xiaohui Fan

arxiv:astro-ph/9910001 v1 · 1999-10-01 · 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{B7Z7ZI7UCMN7577Q2ENWKVU7MC}

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.

Cited by

1 paper in Pith

Strong X-ray Variability of I Zwicky 1: Obscuration from Clumpy Accretion-Disk Winds

Receipt and verification

First computed	2026-05-18T01:40:12.588417Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0ff3fca3f4131bfefff0d11b65569f608cfae996b48448ca6a2331062e92433c

Aliases

arxiv: astro-ph/9910001 · arxiv_version: astro-ph/9910001v1 · doi: 10.48550/arxiv.astro-ph/9910001 · pith_short_12: B7Z7ZI7UCMN7 · pith_short_16: B7Z7ZI7UCMN7577Q · pith_short_8: B7Z7ZI7U

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/B7Z7ZI7UCMN7577Q2ENWKVU7MC \
  | 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: 0ff3fca3f4131bfefff0d11b65569f608cfae996b48448ca6a2331062e92433c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "574a5420c2d7249341cfcb89b8d12d864184ff227ff942a245e91118708eea17",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-10-01T00:19:26Z",
    "title_canon_sha256": "5abc04d99eb936e6dadb44724b16301f11b826e65e66e8de7a26ca0e683ae67a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9910001",
    "kind": "arxiv",
    "version": 1
  }
}