Pith Number

pith:6Q3T2SOJ

pith:1999:6Q3T2SOJTGXT2PZPPUV3YFXY4S

not attested not anchored not stored refs pending

X-ray Properties of the Weak Seyfert 1 Nucleus in NGC 4639

Andrew Ptak, Anuradha P. Koratkar, Hideyo Kunieda, Luis C. Ho, Peter J. Serlemitsos, Tahir Yaqoob, Yuichi Terashima

arxiv:astro-ph/9905013 v1 · 1999-05-03 · 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{6Q3T2SOJTGXT2PZPPUV3YFXY4S}

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	2026-07-04T16:10:56.746186Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f4373d49c999af3d3f2f7d2bbc16f8e48d9e3e313ebe75079d40a0fb48f99edf

Aliases

arxiv: astro-ph/9905013 · arxiv_version: astro-ph/9905013v1 · doi: 10.48550/arxiv.astro-ph/9905013 · pith_short_12: 6Q3T2SOJTGXT · pith_short_16: 6Q3T2SOJTGXT2PZP · pith_short_8: 6Q3T2SOJ

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/6Q3T2SOJTGXT2PZPPUV3YFXY4S \
  | 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: f4373d49c999af3d3f2f7d2bbc16f8e48d9e3e313ebe75079d40a0fb48f99edf

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "da25a4fdd528884e3cf5a5b0ff9fd1718c9a7a5f3e1f164c324c789800496a57",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-05-03T18:19:06Z",
    "title_canon_sha256": "0fadd5c2cdabac04ef76ecfcf63a3fc162c5a736f9a415345891b1634c5a1253"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9905013",
    "kind": "arxiv",
    "version": 1
  }
}