Pith Number

pith:DDQG4UUS

pith:2003:DDQG4UUSMTJL6W24CZDSGCE2QH

not attested not anchored not stored refs pending

XMM-NEWTON High Resolution Spectroscopy of NGC 5548

C. P. de Vries, J.S. Kaastra, K.C. Steenbrugge, R. Edelson

arxiv:astro-ph/0302493 v1 · 2003-02-24 · 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{DDQG4UUSMTJL6W24CZDSGCE2QH}

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	2026-05-18T04:21:41.760392Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

18e06e529264d2bf5b5c164723089a81cd933df3f5ca538a365dae0294673fe2

Aliases

arxiv: astro-ph/0302493 · arxiv_version: astro-ph/0302493v1 · doi: 10.48550/arxiv.astro-ph/0302493 · pith_short_12: DDQG4UUSMTJL · pith_short_16: DDQG4UUSMTJL6W24 · pith_short_8: DDQG4UUS

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/DDQG4UUSMTJL6W24CZDSGCE2QH \
  | 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: 18e06e529264d2bf5b5c164723089a81cd933df3f5ca538a365dae0294673fe2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c12af852d2517b78717c2bd98ee23b91cbbd39017a8307d806b4502c978a628a",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2003-02-24T17:26:19Z",
    "title_canon_sha256": "a931a2931e5cc72af632b322642d115650e8decede38d9fc89d12a668fbcba16"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0302493",
    "kind": "arxiv",
    "version": 1
  }
}