Pith Number

pith:LQCZKTUF

pith:2012:LQCZKTUFY7UF45DA2SGUPMLGUU

not attested not anchored not stored refs pending

Spectral Optical Monitoring of the Narrow Line Seyfert 1 galaxy Ark 564

A. I. Shapovalova, A. Kovacevic, A. Mercado, A. N. Burenkov, D. Dultzin, D. Ilic, E. Benitez, E. De la Fuente, J. Kovacevic, J. Leon-Tavares, J. R. Valdes, J. Torrealba, L. Carrasco, L. C. Popovic, N. G. Bochkarev, V. H. Chavushyan, W. Kollatschny

arxiv:1207.1782 v2 · 2012-07-07 · 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{LQCZKTUFY7UF45DA2SGUPMLGUU}

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	2026-05-18T01:56:27.053787Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

5c05954e85c7e85e7460d48d47b166a50d669ad7604f48d9ba968a56c2a81b4b

Aliases

arxiv: 1207.1782 · arxiv_version: 1207.1782v2 · doi: 10.48550/arxiv.1207.1782 · pith_short_12: LQCZKTUFY7UF · pith_short_16: LQCZKTUFY7UF45DA · pith_short_8: LQCZKTUF

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/LQCZKTUFY7UF45DA2SGUPMLGUU \
  | 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: 5c05954e85c7e85e7460d48d47b166a50d669ad7604f48d9ba968a56c2a81b4b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "59faca13ff304b9bf2fdf1bed2015cc8787e7b299a719ef376ebf73b8a808533",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2012-07-07T09:27:33Z",
    "title_canon_sha256": "c8e457e2fc1195fbf6a0f8237229ffcd3c233b569159e4f6a232e161224c4d47"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1207.1782",
    "kind": "arxiv",
    "version": 2
  }
}