Pith Number

pith:FLAQ25UL

pith:2003:FLAQ25ULB3X55VMITISUGF3ATC

not attested not anchored not stored refs pending

Restless Quasar Activity: From BeppoSAX to Chandra and XMM-Newton

(2) Department of Astronomy, A. Comastri (1), Astrophysics, C. Vignali (1), Italy, The Pennsylvania State University, University Park, USA), W.N. Brandt (2) ((1) INAF-Osservatorio Astronomico di Bologna

arxiv:astro-ph/0309299 v1 · 2003-09-10 · 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{FLAQ25ULB3X55VMITISUGF3ATC}

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	2026-07-04T16:51:38.046485Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2ac10d768b0eefded5889a254317609894c30094eb14aaeab9e10cd33613e7fd

Aliases

arxiv: astro-ph/0309299 · arxiv_version: astro-ph/0309299v1 · doi: 10.48550/arxiv.astro-ph/0309299 · pith_short_12: FLAQ25ULB3X5 · pith_short_16: FLAQ25ULB3X55VMI · pith_short_8: FLAQ25UL

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/FLAQ25ULB3X55VMITISUGF3ATC \
  | 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: 2ac10d768b0eefded5889a254317609894c30094eb14aaeab9e10cd33613e7fd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c34527a3ec946f8135bf5997905b2194e1b02abf657ea75b188c70bc730e0b42",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2003-09-10T20:01:19Z",
    "title_canon_sha256": "4caac79787d6f99b650e93f9d567d41d0405777a5d33c51da0f5ccb505aa900f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0309299",
    "kind": "arxiv",
    "version": 1
  }
}