Pith Number

pith:BHWBJKIV

pith:2004:BHWBJKIVIXLEEEWY4746U3YUN3

not attested not anchored not stored refs pending

The unresolved hard X-ray background: the missing source population implied by the Chandra and XMM-Newton deep fields

A.C. Fabian, D.M. Alexander, D.P. Schneider, F.E. Bauer, G. Hasinger, H. Brunner, M.A. Worsley, S. Mateos, W.N. Brandt

arxiv:astro-ph/0412266 v1 · 2004-12-12 · 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{BHWBJKIVIXLEEEWY4746U3YUN3}

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	2026-07-04T15:49:49.958687Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

09ec14a91545d64212d8e7f9ea6f146ecb211918d8ed22bff4bc0f1ef3874157

Aliases

arxiv: astro-ph/0412266 · arxiv_version: astro-ph/0412266v1 · doi: 10.48550/arxiv.astro-ph/0412266 · pith_short_12: BHWBJKIVIXLE · pith_short_16: BHWBJKIVIXLEEEWY · pith_short_8: BHWBJKIV

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/BHWBJKIVIXLEEEWY4746U3YUN3 \
  | 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: 09ec14a91545d64212d8e7f9ea6f146ecb211918d8ed22bff4bc0f1ef3874157

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e73aad249db6b0f53d7a68c464d7d6020ae39a1696c2ee8270e389b87e2800eb",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2004-12-12T15:18:45Z",
    "title_canon_sha256": "545e334ecd62d9cd32f96c753ef8004d5ee8030fb1ce08b366a92abbf74b700f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0412266",
    "kind": "arxiv",
    "version": 1
  }
}