Pith Number

pith:PPPBD4IT

pith:1998:PPPBD4ITQUH6AG4YJC4COQUGW7

not attested not anchored not stored refs pending

On the QSO content of the First Byurakan Survey and the completeness of the Palomar Green Survey

A. C. Goncalves (OHP), A. M. Mickaelian (BAO), M.-P. Veron-Cetty (OHP), P. Veron (OHP)

arxiv:astro-ph/9809148 v1 · 1998-09-11 · 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{PPPBD4ITQUH6AG4YJC4COQUGW7}

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	2026-05-18T01:33:49.571095Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7bde11f113850fe01b9848b8274286b7e346bb8b7b4c7419bd24349ec39f7912

Aliases

arxiv: astro-ph/9809148 · arxiv_version: astro-ph/9809148v1 · doi: 10.48550/arxiv.astro-ph/9809148 · pith_short_12: PPPBD4ITQUH6 · pith_short_16: PPPBD4ITQUH6AG4Y · pith_short_8: PPPBD4IT

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/PPPBD4ITQUH6AG4YJC4COQUGW7 \
  | 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: 7bde11f113850fe01b9848b8274286b7e346bb8b7b4c7419bd24349ec39f7912

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "43613b886b624e5777ffd29ab26aa80eaf487300ebe3d2740da7419609b9a95b",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1998-09-11T11:11:10Z",
    "title_canon_sha256": "3f5d06373b4a4803ad92a087527bffc7c9b1aec14bf77dcf8d5a661f25984496"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9809148",
    "kind": "arxiv",
    "version": 1
  }
}