Pith Number

pith:ARBC472V

pith:1998:ARBC472VSRTEJ6J6Z4FGSE7KGG

not attested not anchored not stored refs pending

Constraints on a soft X-ray excess in the quasar 3C 279

A. J. Lawson, I.M. McHardy

arxiv:astro-ph/9809308 v1 · 1998-09-24 · 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{ARBC472VSRTEJ6J6Z4FGSE7KGG}

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	2026-05-18T01:40:13.692065Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

04422e7f55946644f93ecf0a6913ea31af8799c3423ec9d4acabc1ff4b84cd1f

Aliases

arxiv: astro-ph/9809308 · arxiv_version: astro-ph/9809308v1 · doi: 10.48550/arxiv.astro-ph/9809308 · pith_short_12: ARBC472VSRTE · pith_short_16: ARBC472VSRTEJ6J6 · pith_short_8: ARBC472V

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/ARBC472VSRTEJ6J6Z4FGSE7KGG \
  | 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: 04422e7f55946644f93ecf0a6913ea31af8799c3423ec9d4acabc1ff4b84cd1f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d5367f1ed2c795f46edd00b2c14f034a52089532cf7016dfb65571b86fa1d4dd",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1998-09-24T14:28:33Z",
    "title_canon_sha256": "545e7acb09f6c96b0f5294b4c4a00242284b61cb2477b2ebfdb1bd3c06a1c28e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9809308",
    "kind": "arxiv",
    "version": 1
  }
}