Pith Number

pith:CKKWO4XB

pith:2006:CKKWO4XBZDZMBOZQ5GWRB2ZI7Q

not attested not anchored not stored refs pending

The Optical and Near-Infrared Properties of 2837 Quasars in the UKIRT Infrared Deep Sky Survey (UKIDSS)

(2) Drexel University, 3), (3) Johns Hopkins University, (4) Institute of Astronomy, Cambridge), Gordon T. Richards (2, Kuenley Chiu (1), Natasha Maddox (4) ((1) University of Exeter, Paul C. Hewett (4), UK

arxiv:astro-ph/0612608 v1 · 2006-12-21 · 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{CKKWO4XBZDZMBOZQ5GWRB2ZI7Q}

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	2026-07-04T15:16:28.380099Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

12956772e1c8f2c0bb30e9ad10eb28fc3dc2ca17f359872b5d1d7e1e18019f46

Aliases

arxiv: astro-ph/0612608 · arxiv_version: astro-ph/0612608v1 · doi: 10.48550/arxiv.astro-ph/0612608 · pith_short_12: CKKWO4XBZDZM · pith_short_16: CKKWO4XBZDZMBOZQ · pith_short_8: CKKWO4XB

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/CKKWO4XBZDZMBOZQ5GWRB2ZI7Q \
  | 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: 12956772e1c8f2c0bb30e9ad10eb28fc3dc2ca17f359872b5d1d7e1e18019f46

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "045c9eb6d79349679bbe388f654e17b2b1edbd05d61b1b8d5a481b2a20ab4531",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2006-12-21T13:27:11Z",
    "title_canon_sha256": "39455d6079c92b227a43b8da8dd6e35cc2bbd3a8df20906ffc37322ea817cfcb"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0612608",
    "kind": "arxiv",
    "version": 1
  }
}