Pith Number

pith:5UDF4YQ7

pith:2011:5UDF4YQ7PFKKNRMOBZGITTKB27

not attested not anchored not stored refs pending

The Color Variability of Quasars

Dan Maoz, David W. Hogg, Hans-Walter Rix, Jo Bovy, Joseph C. Shields, Kasper B. Schmidt, Matthias Knecht

arxiv:1109.6653 v2 · 2011-09-29 · 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{5UDF4YQ7PFKKNRMOBZGITTKB27}

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	2026-05-18T02:00:21.319284Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ed065e621f7954a6c58e0e4c89cd41d7f47fe680213c15ad5a377604442d35d2

Aliases

arxiv: 1109.6653 · arxiv_version: 1109.6653v2 · doi: 10.48550/arxiv.1109.6653 · pith_short_12: 5UDF4YQ7PFKK · pith_short_16: 5UDF4YQ7PFKKNRMO · pith_short_8: 5UDF4YQ7

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/5UDF4YQ7PFKKNRMOBZGITTKB27 \
  | 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: ed065e621f7954a6c58e0e4c89cd41d7f47fe680213c15ad5a377604442d35d2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1542dd8e09689cb49aad9f4a30e3571bddcbc6ec36f35382a2ee9ca039a13705",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2011-09-29T20:00:01Z",
    "title_canon_sha256": "88a7105cfb69c3965c38b9fce5fea958708177fbcd20ebb15e1938db8d4623be"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1109.6653",
    "kind": "arxiv",
    "version": 2
  }
}