Pith Number

pith:ISZJZTEJ

pith:2004:ISZJZTEJEEO6MDIIU2CUCF6VRX

not attested not anchored not stored refs pending

BL Lac X-ray Spectra: simpler than we thought

Anuradha Koratkar (UMBC), Eric S. Perlman (UMBC), Grzegorz Madejski (SLAC), Hugh Aller (Michigan), John T. Stocke (Colorado), Julian H. Krolik (JHU), Karl Andersson (SLAC), Margo Aller (Michigan), Mark Allen (CDS Strasbourg) Stefan Wagner (LSW Heidelberg), Paolo Padovani (ESO), Timothy Daugherty (UMBC), Travis A. Rector (Alaska-Anchorage)

arxiv:astro-ph/0403575 v1 · 2004-03-24 · 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{ISZJZTEJEEO6MDIIU2CUCF6VRX}

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	2026-05-18T00:37:00.662727Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

44b29ccc89211de60d08a6854117d58dd43c2f1ed8417f051894b1950d976735

Aliases

arxiv: astro-ph/0403575 · arxiv_version: astro-ph/0403575v1 · doi: 10.48550/arxiv.astro-ph/0403575 · pith_short_12: ISZJZTEJEEO6 · pith_short_16: ISZJZTEJEEO6MDII · pith_short_8: ISZJZTEJ

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/ISZJZTEJEEO6MDIIU2CUCF6VRX \
  | 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: 44b29ccc89211de60d08a6854117d58dd43c2f1ed8417f051894b1950d976735

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "21754f72d0fd1e7346472f6a31162f1b88e3a287fa9e84d9e149bc882e5eaf7a",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2004-03-24T14:01:58Z",
    "title_canon_sha256": "5ea7cb2a5be18f4888ac9b539233a172e413d228df0c00f3991c55985c71d730"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0403575",
    "kind": "arxiv",
    "version": 1
  }
}