Pith Number

pith:2HSMFSOD

pith:1999:2HSMFSODSI3VFM4KPMVQTTYT7X

not attested not anchored not stored refs pending

Exploratory ASCA Observations of Broad Absorption Line Quasi-Stellar Objects

N. Yamasaki (Tokyo Metropolitan), R.M. Sambruna (Penn State), S.C. Gallagher, S. Mathur (CfA), W.N. Brandt

arxiv:astro-ph/9902045 v1 · 1999-02-02 · 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{2HSMFSODSI3VFM4KPMVQTTYT7X}

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	2026-05-18T02:40:34.828653Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d1e4c2c9c3923752b38a7b2b09cf13fdd78e9583e5d03ef23adbb929c58209dc

Aliases

arxiv: astro-ph/9902045 · arxiv_version: astro-ph/9902045v1 · doi: 10.48550/arxiv.astro-ph/9902045 · pith_short_12: 2HSMFSODSI3V · pith_short_16: 2HSMFSODSI3VFM4K · pith_short_8: 2HSMFSOD

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/2HSMFSODSI3VFM4KPMVQTTYT7X \
  | 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: d1e4c2c9c3923752b38a7b2b09cf13fdd78e9583e5d03ef23adbb929c58209dc

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "cc9d2dcecac09bf79c8e1d80b750ca1d0de65cc3d340883f845cd539c941e8f3",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-02-02T21:45:07Z",
    "title_canon_sha256": "b5926fb888741244d016a1d29da82da4b7171769cc08b2cdb808a65d66b1bf1c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9902045",
    "kind": "arxiv",
    "version": 1
  }
}