Pith Number

pith:ZLHRC633

pith:2009:ZLHRC633YFQII2AFXS557DQMT7

not attested not anchored not stored refs pending

Flat-Spectrum Radio Quasars from SDSS DR3 Quasar Catalogue

Minfeng Gu, Xinwu Cao (SHAO), Zhaoyu Chen

arxiv:0904.1452 v1 · 2009-04-09 · astro-ph.GA

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ZLHRC633YFQII2AFXS557DQMT7}

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	2026-05-18T02:14:06.788724Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

cacf117b7bc160846805bcbbdf8e0c9fe33408d6946311ec342c8eb7584f7bff

Aliases

arxiv: 0904.1452 · arxiv_version: 0904.1452v1 · doi: 10.48550/arxiv.0904.1452 · pith_short_12: ZLHRC633YFQI · pith_short_16: ZLHRC633YFQII2AF · pith_short_8: ZLHRC633

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/ZLHRC633YFQII2AFXS557DQMT7 \
  | 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: cacf117b7bc160846805bcbbdf8e0c9fe33408d6946311ec342c8eb7584f7bff

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f063d93c52568bebc34c2e1a75303bc18783892918e540f00b6780cebab3638d",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2009-04-09T02:40:32Z",
    "title_canon_sha256": "27b13d1cb9400ccf6aa144bf935e6005a83af1efd6f21e5e736c589717b667da"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.1452",
    "kind": "arxiv",
    "version": 1
  }
}