Pith Number

pith:PCUI2CKY

pith:1997:PCUI2CKYVZGHIEP6WJAYHCSGVU

not attested not anchored not stored refs pending

1H0419-577: a two-state Seyfert Galaxy?

(2) Osservatorio Astronomico di Bologna, (3) Dep. of Astron. & Astophys., (4) SSD/ESTEC. Noordwijk, (5) Mullard Space Science Laboratory, A.Comastri, A.Parmar (4), Dorking, E.M.Puchnarewicz (5) ((1) Beppo-SAX SDC, G.Stirpe (2), Italy, M.Guainazzi (1), Penn State Un., Roma, The Netherlands, U.K.), Un. College London, U.S.A., W.N.Brandt (3)

arxiv:astro-ph/9712248 v1 · 1997-12-18 · astro-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{PCUI2CKYVZGHIEP6WJAYHCSGVU}

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	2026-05-18T01:40:14.681633Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

78a88d0958ae4c7411feb241838a46ad1d25d3d88ec0730181af8337261277de

Aliases

arxiv: astro-ph/9712248 · arxiv_version: astro-ph/9712248v1 · doi: 10.48550/arxiv.astro-ph/9712248 · pith_short_12: PCUI2CKYVZGH · pith_short_16: PCUI2CKYVZGHIEP6 · pith_short_8: PCUI2CKY

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/PCUI2CKYVZGHIEP6WJAYHCSGVU \
  | 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: 78a88d0958ae4c7411feb241838a46ad1d25d3d88ec0730181af8337261277de

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4af5c1123f6e02284b23794922d83e1f9e2031d16b15af115ec8eab2cf9a605d",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1997-12-18T13:31:44Z",
    "title_canon_sha256": "671976cc92b62bfdecf98c6adbb2535b43e388b99f9681951351cc4b272340ee"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9712248",
    "kind": "arxiv",
    "version": 1
  }
}