Pith Number

pith:6YGPCOKB

pith:2004:6YGPCOKBXFPNWWLMGNQHN7KV7Q

not attested not anchored not stored refs pending

The z>4 Quasar Population Observed by Chandra and XMM-Newton

C. Vignali (INAF-Osservatorio Astronomico di Bologna; Dipartimento di Astronomia, D.P. Schneider (Department of Astronomy & Astrophysics, Italy), The Pennsylvania State University, Universita' di Bologna, USA), W.N. Brandt

arxiv:astro-ph/0406033 v1 · 2004-06-01 · 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{6YGPCOKBXFPNWWLMGNQHN7KV7Q}

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	2026-05-18T00:37:17.367519Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f60cf13941b95edb596c336076fd55fc04cb1de0f37fe7b15a69c007b6df13ee

Aliases

arxiv: astro-ph/0406033 · arxiv_version: astro-ph/0406033v1 · doi: 10.48550/arxiv.astro-ph/0406033 · pith_short_12: 6YGPCOKBXFPN · pith_short_16: 6YGPCOKBXFPNWWLM · pith_short_8: 6YGPCOKB

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/6YGPCOKBXFPNWWLMGNQHN7KV7Q \
  | 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: f60cf13941b95edb596c336076fd55fc04cb1de0f37fe7b15a69c007b6df13ee

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "705484d721961aca53e72e739b5459346a91b36de4f5432a35bf8d1bad4c9b93",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2004-06-01T20:19:21Z",
    "title_canon_sha256": "6fc62f46cf3f3a4baf9be52ad564860e65224bb4c8d34bc28ce92efd6ced18c1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0406033",
    "kind": "arxiv",
    "version": 1
  }
}