Pith Number

pith:GZO77GPV

pith:2012:GZO77GPVSGJR2ZOCVULTS3GDXH

not attested not anchored not stored refs pending

NGC454: unveiling a new "changing look" AGN

Alessandro Caccianiga, Elena Marchese, Paola Severgnini, Roberto Della Ceca, Valentina Braito

arxiv:1201.2169 v1 · 2012-01-10 · 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{GZO77GPVSGJR2ZOCVULTS3GDXH}

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	2026-05-18T01:01:29.743373Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

365dff99f591931d65c2ad17396cc3b9f78a187f2a3a1e55ab608a310fe3cca8

Aliases

arxiv: 1201.2169 · arxiv_version: 1201.2169v1 · doi: 10.48550/arxiv.1201.2169 · pith_short_12: GZO77GPVSGJR · pith_short_16: GZO77GPVSGJR2ZOC · pith_short_8: GZO77GPV

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/GZO77GPVSGJR2ZOCVULTS3GDXH \
  | 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: 365dff99f591931d65c2ad17396cc3b9f78a187f2a3a1e55ab608a310fe3cca8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0ad6dd1682bc89acc948d49f7fe54295535cda334f5726f7a484641822435c64",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2012-01-10T20:50:29Z",
    "title_canon_sha256": "a0e2562e5e3f1d0743eaf69de8ec111f98fb5307ee3a104be73f38e6bc9ecaa7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1201.2169",
    "kind": "arxiv",
    "version": 1
  }
}