Pith Number

pith:DF6XC4VR

pith:2009:DF6XC4VRFBNHLNUE3VLXJCV4TS

not attested not anchored not stored refs pending

The relative growth of Optical and Radio Quasars in SDSS

(2) U. Virginia, (3) DARK Cosmology Centre, (4) U. Michigan, 5), (5) Steward Observatory, Francesco Shankar (1), Gregory R. Sivakoff (2), Marianne Vestergaard (3, U. Arizona), U. Copenhagen, Xinyu Dai (4) ((1) MPA

arxiv:0909.4092 v1 · 2009-09-23 · astro-ph.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{DF6XC4VRFBNHLNUE3VLXJCV4TS}

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	2026-05-18T02:11:45.122098Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

197d7172b1285a75b684dd57748abc9cba40b7dc6b2dbfb02ead805547b9fc7b

Aliases

arxiv: 0909.4092 · arxiv_version: 0909.4092v1 · doi: 10.48550/arxiv.0909.4092 · pith_short_12: DF6XC4VRFBNH · pith_short_16: DF6XC4VRFBNHLNUE · pith_short_8: DF6XC4VR

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/DF6XC4VRFBNHLNUE3VLXJCV4TS \
  | 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: 197d7172b1285a75b684dd57748abc9cba40b7dc6b2dbfb02ead805547b9fc7b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "27f5fd5a1d752420e07487484b436fa8096eeed90fd214c6be3020e74bf46d4d",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-09-23T14:08:42Z",
    "title_canon_sha256": "9cdde1b16d16ac5a4a4fe94161f6d75f2ea4f61bf7558b65ad117f7a43a7b473"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0909.4092",
    "kind": "arxiv",
    "version": 1
  }
}