Pith Number

pith:ILSL4KQZ

pith:2012:ILSL4KQZNV5PGAISR2IPRYNQQ2

not attested not anchored not stored refs pending

Is Quasar Optical Variability a Damped Random Walk?

(2) Warsaw University Observatory), Andrzej Udalski (2) ((1) OSU, C. S. Kochanek (1), Szymon Koz{\l}owski (2), Ying Zu (1)

arxiv:1202.3783 v2 · 2012-02-16 · astro-ph.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ILSL4KQZNV5PGAISR2IPRYNQQ2}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more

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	2026-05-18T03:32:57.126103Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

42e4be2a196d7af301128e90f8e1b086afcd19d7dd2a9ca789431ee49bb6d458

Aliases

arxiv: 1202.3783 · arxiv_version: 1202.3783v2 · doi: 10.48550/arxiv.1202.3783 · pith_short_12: ILSL4KQZNV5P · pith_short_16: ILSL4KQZNV5PGAIS · pith_short_8: ILSL4KQZ

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/ILSL4KQZNV5PGAISR2IPRYNQQ2 \
  | 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: 42e4be2a196d7af301128e90f8e1b086afcd19d7dd2a9ca789431ee49bb6d458

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8595031a424c11cc975bd8a06ba583a04fafd3d89ab15b0f94ede04b080cd244",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2012-02-16T21:00:00Z",
    "title_canon_sha256": "86599bb4825e0c9782b007d4d8b213e305d891867455faa1a476ecf53864ec97"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1202.3783",
    "kind": "arxiv",
    "version": 2
  }
}