Pith Number

pith:N2WDYSIU

pith:2001:N2WDYSIU4I6IFRGQQZRJBJ62RB

not attested not anchored not stored refs pending

Exploring the Early Universe with XMM-Newton

G. Hasinger, I. Lehmann, M. Schmidt, S.S. Murray

arxiv:astro-ph/0109172 v1 · 2001-09-11 · 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{N2WDYSIU4I6IFRGQQZRJBJ62RB}

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	2026-07-04T14:11:28.125403Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6eac3c4914e23c82c4d0866290a7da8869805d91382b0181b737304ea771e53e

Aliases

arxiv: astro-ph/0109172 · arxiv_version: astro-ph/0109172v1 · doi: 10.48550/arxiv.astro-ph/0109172 · pith_short_12: N2WDYSIU4I6I · pith_short_16: N2WDYSIU4I6IFRGQ · pith_short_8: N2WDYSIU

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/N2WDYSIU4I6IFRGQQZRJBJ62RB \
  | 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: 6eac3c4914e23c82c4d0866290a7da8869805d91382b0181b737304ea771e53e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "90c262e218f07e42dcfc6ad0f27c20ce890bb885e0fb6bb21069732510274df2",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2001-09-11T11:43:27Z",
    "title_canon_sha256": "d8f221822405e97cca96938cd6aad96be0bed67c753584d0176317834b2a5dcc"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0109172",
    "kind": "arxiv",
    "version": 1
  }
}