Pith Number

pith:K2PTCM76

pith:2026:K2PTCM76QCGCHPPFRFGNBQPRFY

not attested not anchored not stored refs pending

OQ~208: A New Fe~II Changing-look Active Galactic Nucleus and Implications for the Nature of the Changing-look Phenomenon

A. V. Filippenko, C. Gao, D. W. Xu, J. Wang, J. Y. Wei, T. G. Brink, W. K. Zheng, Z. H. Yao

arxiv:2606.17599 v1 · 2026-06-16 · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{K2PTCM76QCGCHPPFRFGNBQPRFY}

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	2026-06-19T16:10:16.988914Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

569f3133fe808c23bde5894cd0c1f12e2701826dae8b82ed1956f13913a20a02

Aliases

arxiv: 2606.17599 · arxiv_version: 2606.17599v1 · doi: 10.48550/arxiv.2606.17599 · pith_short_12: K2PTCM76QCGC · pith_short_16: K2PTCM76QCGCHPPF · pith_short_8: K2PTCM76

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/K2PTCM76QCGCHPPFRFGNBQPRFY \
  | 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: 569f3133fe808c23bde5894cd0c1f12e2701826dae8b82ed1956f13913a20a02

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "38837cde62b36b7585b1f9cf9add548e853c94fba1c922413a28e312b45a0d01",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2026-06-16T07:04:53Z",
    "title_canon_sha256": "e188ad2c12896e9015ac17d905bebbf82df0a37814f1fb4dea298b8adc2aa670"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2606.17599",
    "kind": "arxiv",
    "version": 1
  }
}