Pith Number

pith:XL4L56O7

pith:2002:XL4L56O7DOGZARMQEPEKU6LTBV

not attested not anchored not stored refs pending

Discovery of four X-ray quasars behind the Large Magellanic Cloud

A. Dobrzycki, K. Z. Stanek, L. M. Macri, P. J. Groot

arxiv:astro-ph/0202524 v2 · 2002-02-28 · 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{XL4L56O7DOGZARMQEPEKU6LTBV}

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	2026-05-18T01:07:45.077800Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

baf8bef9df1b8d90459023c8aa79730d4c1edcf510ad6ce772cb539fe90a6881

Aliases

arxiv: astro-ph/0202524 · arxiv_version: astro-ph/0202524v2 · doi: 10.48550/arxiv.astro-ph/0202524 · pith_short_12: XL4L56O7DOGZ · pith_short_16: XL4L56O7DOGZARMQ · pith_short_8: XL4L56O7

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/XL4L56O7DOGZARMQEPEKU6LTBV \
  | 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: baf8bef9df1b8d90459023c8aa79730d4c1edcf510ad6ce772cb539fe90a6881

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a896468be3b5bdaf110583a5f2e6732bae24ec00c8b6be9ed019d21c84f68a6a",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2002-02-28T15:16:34Z",
    "title_canon_sha256": "160faeef397e2461d11da77fe01f9a532f8652507ce2ea5e8f7db3c16439889c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0202524",
    "kind": "arxiv",
    "version": 2
  }
}