Pith Number

pith:ABKCQPQK

pith:1999:ABKCQPQKSARCB7A7W4EN52OO7K

not attested not anchored not stored refs pending

X-ray luminous radio-quiet high redshift QSOs in the ROSAT All-Sky Survey

Beijing), Norbert Bade, Volker Beckmann (Hamburg), Xue-Bing Wu (BAO

arxiv:astro-ph/9904233 v1 · 1999-04-19 · 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{ABKCQPQKSARCB7A7W4EN52OO7K}

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	2026-05-18T01:07:36.453897Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0054283e0a902220fc1fb708dee9cefab883e77c09390fa8f032957cc9f63bdb

Aliases

arxiv: astro-ph/9904233 · arxiv_version: astro-ph/9904233v1 · doi: 10.48550/arxiv.astro-ph/9904233 · pith_short_12: ABKCQPQKSARC · pith_short_16: ABKCQPQKSARCB7A7 · pith_short_8: ABKCQPQK

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/ABKCQPQKSARCB7A7W4EN52OO7K \
  | 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: 0054283e0a902220fc1fb708dee9cefab883e77c09390fa8f032957cc9f63bdb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f01c193f9b00b410ec870628942d399c228ff21c328614c986b9c4ee6947beff",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-04-19T05:48:14Z",
    "title_canon_sha256": "6984b039480684623a6cc0f753d64f346070ee63c5e738107dd71a934f601aad"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9904233",
    "kind": "arxiv",
    "version": 1
  }
}