Pith Number

pith:YKLXGRX2

pith:2005:YKLXGRX2RWNXXT6ZHKAIUL5NG7

not attested not anchored not stored refs pending

XMM-Newton Observations of High Redshift Quasars

B. Wilkes (Harvard-Smithsonian Center for Astrophysics), D. Grupe (The Ohio State University), P. Osmer (The Ohio State University), S. Mathur (The Ohio State University)

arxiv:astro-ph/0501521 v2 · 2005-01-24 · 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{YKLXGRX2RWNXXT6ZHKAIUL5NG7}

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	2026-05-18T04:36:30.250248Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c2977346fa8d9b7bcfd93a808a2fad37cac913320c896aeef011b81a9d1befdd

Aliases

arxiv: astro-ph/0501521 · arxiv_version: astro-ph/0501521v2 · doi: 10.48550/arxiv.astro-ph/0501521 · pith_short_12: YKLXGRX2RWNX · pith_short_16: YKLXGRX2RWNXXT6Z · pith_short_8: YKLXGRX2

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/YKLXGRX2RWNXXT6ZHKAIUL5NG7 \
  | 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: c2977346fa8d9b7bcfd93a808a2fad37cac913320c896aeef011b81a9d1befdd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "01e5625699ed0047ecdbe5c7ac9802c3e21b86c6678f15316f0190a45d70ca1d",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2005-01-24T21:41:59Z",
    "title_canon_sha256": "746fb3e70dd02f9a5ff4f23591c4843e4b573713860e2746b25e9a9cf689b57a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0501521",
    "kind": "arxiv",
    "version": 2
  }
}