Pith Number

pith:V4MZ42GS

pith:2018:V4MZ42GS3MHMDCGBHV3TZE2KYR

not attested not anchored not stored refs pending

Dramatic X-ray spectral variability of a Compton-thick type-1 QSO at $z\sim 1$

(2) Pontificia Universidad Catolica de Chile, 3), (3) Excellence Cluster Universe, (4) Department of Astronomy, (5) Argelander-Institut f\"ur Astronomie, (6) Center for Astrophysics, (7) Steward Observatory, (8) Department of Astronomy, 9) ((1) Max Planck Institute for Extraterrestrial Physics, (9) Institute for Gravitation, Alison L. Coil (6), Andrea Merloni (1), Astrophysics, Bonn, Chile, Christopher N. A. Willmer (7), Donald P. Schneider (8, Dpt. of Physics, Garching, Germany, Instituto de Astrofisica, Johannes Buchner (2, Kirpal Nandra (1), Santiago, Space Sciences, the Cosmos, The Pennsylvania State University, Thomas Erben (5), Torben Simm (1), Tucson, University of Arizona, University of Illinois at Urbana-Champaign, Univ. of California San Diego, USA, USA), Yue Shen (4)

arxiv:1808.05207 v1 · 2018-08-15 · astro-ph.GA · astro-ph.HE

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{V4MZ42GS3MHMDCGBHV3TZE2KYR}

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	2026-05-18T00:07:33.576565Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

af199e68d2db0ec188c13d773c934ac463e4d0af482ac8bdc36eef52fcad1e99

Aliases

arxiv: 1808.05207 · arxiv_version: 1808.05207v1 · doi: 10.48550/arxiv.1808.05207 · pith_short_12: V4MZ42GS3MHM · pith_short_16: V4MZ42GS3MHMDCGB · pith_short_8: V4MZ42GS

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/V4MZ42GS3MHMDCGBHV3TZE2KYR \
  | 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: af199e68d2db0ec188c13d773c934ac463e4d0af482ac8bdc36eef52fcad1e99

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5f2c17af9b9fdf03cc1ae4426aa30688806ee17ebeeb46039abac9d829b3d76d",
    "cross_cats_sorted": [
      "astro-ph.HE"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2018-08-15T17:56:39Z",
    "title_canon_sha256": "d0c36ff17fd29c4d928748c06c0a5d503c4186b1d607750f656b7f967e7004a8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1808.05207",
    "kind": "arxiv",
    "version": 1
  }
}