Pith Number

pith:YTKE7KOY

pith:1998:YTKE7KOYLTUU4WZW7ECTN2H6FN

not attested not anchored not stored refs pending

Steps Toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XV. Long-Term Optical Monitoring of NGC 5548

A.I. Shapovalova, A.J. Barth, A.N. Burenkov, A.V. Filippenko, B.J. Wilkes, B.M. Peterson, B. Nelson, D.C. Leonard, E.A. Sergeeva, E. Giannuzzo, F.-Z. Cheng, G.M. Stirpe, H. Wu, I. Wanders, J. Hunley, J. Peters, J.P. Huchra, J.-Y. Wei, K. Bischoff, L.C. Ho, M. Dietrich, M. Mignoli, N.G. Bochkarev, P. Berlind, P. Papaderos, R. Bertram, R.M. Wagner, R.W. Pogge, S.G. Sergeev, S.-J. Xue, S. Kaspi, S. Tokarz, T. Matheson, V.I. Pronik, W. Kollatschny, Yu.F. Malkov, Z.-L. Zou

arxiv:astro-ph/9808236 v1 · 1998-08-21 · 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{YTKE7KOYLTUU4WZW7ECTN2H6FN}

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	2026-07-04T16:06:57.087220Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c4d44fa9d85ce94e5b36f90536e8fe2b6116f5344fb750dceb4b891fc1cab1f2

Aliases

arxiv: astro-ph/9808236 · arxiv_version: astro-ph/9808236v1 · doi: 10.48550/arxiv.astro-ph/9808236 · pith_short_12: YTKE7KOYLTUU · pith_short_16: YTKE7KOYLTUU4WZW · pith_short_8: YTKE7KOY

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/YTKE7KOYLTUU4WZW7ECTN2H6FN \
  | 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: c4d44fa9d85ce94e5b36f90536e8fe2b6116f5344fb750dceb4b891fc1cab1f2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "77bca57befaa946b66f0102082b86c494a539e2e0406c6394eabb1ab874b2dde",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1998-08-21T17:30:40Z",
    "title_canon_sha256": "cb394e2977a423cae23f88869792d3ac36cf9f01ab3aafa26f903b7ab8cc7d30"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9808236",
    "kind": "arxiv",
    "version": 1
  }
}