Pith Number

pith:FHF43B4M

pith:2004:FHF43B4MS4OO4DENWXJTTBQHOZ

not attested not anchored not stored refs pending

The (un)resolved X-ray background in the Lockman Hole

A.C. Fabian, G. Hasinger, H. Brunner, M.A. Worsley, S. Mateos, X. Barcons

arxiv:astro-ph/0404273 v2 · 2004-04-14 · 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{FHF43B4MS4OO4DENWXJTTBQHOZ}

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	2026-07-04T16:43:34.409613Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

29cbcd878c971cee0c8db5d3398607767d21f711dfc0c693dde3ea84a90b2869

Aliases

arxiv: astro-ph/0404273 · arxiv_version: astro-ph/0404273v2 · doi: 10.48550/arxiv.astro-ph/0404273 · pith_short_12: FHF43B4MS4OO · pith_short_16: FHF43B4MS4OO4DEN · pith_short_8: FHF43B4M

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/FHF43B4MS4OO4DENWXJTTBQHOZ \
  | 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: 29cbcd878c971cee0c8db5d3398607767d21f711dfc0c693dde3ea84a90b2869

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b0f59346c0250f575adaa97af16ec39ed0496ada696eac3261cf904c10577061",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2004-04-14T13:47:55Z",
    "title_canon_sha256": "f88cf077b3e94823049a80b22c8a888c9f21de053ccde9c1b12c0ed446523c13"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0404273",
    "kind": "arxiv",
    "version": 2
  }
}