Pith Number

pith:CDYCHFRF

pith:2018:CDYCHFRFMGBACGFSR4L6CWDUSM

not attested not anchored not stored refs pending

X-ray spectra reveal the reawakening of the repeat changing-look AGN NGC 1566

D. Grupe, F. Harrison, L. Tom\'as, M. L. Parker, M. Santos-Lle\'o, N. Schartel, R. Mikula, S. Komossa, W. Kollatschny

arxiv:1811.10289 v1 · 2018-11-26 · 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{CDYCHFRFMGBACGFSR4L6CWDUSM}

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	2026-05-17T23:59:56.894017Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

10f023962561820118b28f17e1587493134061503a6e97fae998fcd4bb51dc69

Aliases

arxiv: 1811.10289 · arxiv_version: 1811.10289v1 · doi: 10.48550/arxiv.1811.10289 · pith_short_12: CDYCHFRFMGBA · pith_short_16: CDYCHFRFMGBACGFS · pith_short_8: CDYCHFRF

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/CDYCHFRFMGBACGFSR4L6CWDUSM \
  | 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: 10f023962561820118b28f17e1587493134061503a6e97fae998fcd4bb51dc69

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1d6779bf00eb02f8cb11e309a302eab8b40857d1be6272b7fe900189ee7d823a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2018-11-26T11:11:52Z",
    "title_canon_sha256": "474ed37fcf9f1534b265d13c386caec5e6a0583737f1cfd4a8de439be9c3f650"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1811.10289",
    "kind": "arxiv",
    "version": 1
  }
}